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| (R) ISL3330, ISL3331 Data Sheet May 20, 2008 FN6361.0 3.3V, 15kV ESD Protected, Dual Protocol (RS-232/RS-485) Transceivers These devices are BiCMOS interface ICs that are user configured as either a single RS-422/RS-485 differential transceiver, or as a dual (2 Tx, 2 Rx) RS-232 transceiver. In RS-232 mode, the on-board charge pump generates RS-232 compliant 5V Tx output levels, from a supply as low as 3.15V. Four small 0.1F capacitors are required for the charge pump. The transceivers are RS-232 compliant, with the Rx inputs handling up to 25V. In RS-485 mode, the transceivers support both the RS-485 and RS-422 differential communication standards. The RS-485 receiver features "full failsafe" operation, so the Rx output remains in a high state if the inputs are open or shorted together. The RS-485 transmitter supports up to three data rates, two of which are slew rate limited for problem free communications. The charge pump disables in RS-485 mode, thereby saving power, minimizing noise, and eliminating the charge pump capacitors. Both RS-232/RS-485 modes feature loopback and shutdown functions. The loopback mode internally connects the Tx outputs to the corresponding Rx input, which facilitates the implementation of board level self test functions. The outputs remain connected to the loads during loopback, where connection problems (e.g., shorted connectors or cables) can be detected. The shutdown mode disables the Tx and Rx outputs, disables the charge pump if in RS-232 mode, and places the IC in a low current (30A) mode. The ISL3331 is a QFN packaged device that offers additional functionality, including a lower speed and edge rate option (115kbps) for EMI sensitive designs, or to allow longer bus lengths. It also features a logic supply voltage pin (VL) that sets the VOH level of logic outputs, and the switching points of logic inputs, to be compatible with another supply voltage in mixed voltage systems. The QFN's choice of active high or low Rx enable pins increases design flexibility, allowing Tx/Rx direction control via a single signal by connecting DEN and RXEN together. For a dual port version of these devices, please see the ISL3332/ISL3333 data sheet. Features * User Selectable RS-232 or RS-485/RS-422 Interface Port (Two RS-232 Transceivers or One RS-485/RS-422 Transceiver) * Operates From a Single 3.3V Supply * 15kV (HBM) ESD Protected Bus Pins (RS-232 or RS-485) * 5V Tolerant Logic Inputs * True Flow-Through Pinouts Simplify Board Layouts * Pb-Free (RoHS Compliant) * Full Failsafe (Open/Short) Rx in RS-485/RS-422 Mode * Loopback Mode Facilitates Board Self Test Functions * User Selectable RS-485 Data Rates . . . . . . . . . . 20Mbps - Slew Rate Limited. . . . . . . . . . . . . . . . . . . . . . . 460kbps - Slew Rate Limited (ISL3331 Only) . . . . . . . . . . 115kbps * Fast RS-232 Data Rate . . . . . . . . . . . . . . . Up to 400kbps * Low Current Shutdown Mode. . . . . . . . . . . . . . . . . . 30A * QFN Package Saves Board Space (ISL3331 Only) * Logic Supply Pin (VL) Eases Operation in Mixed Supply Systems (ISL3331 Only) Applications * Gaming Applications (e.g., Slot machines) * Single Board Computers * Factory Automation * Security Networks * Industrial/Process Control Networks * Level Translators (e.g., RS-232 to RS-422) * Point of Sale Equipment Related Literature * Application Note AN1401 "Implementing a Three Pin, Half-Duplex, Dual Protocol Interface" TABLE 1. SUMMARY OF FEATURES PART NUMBER ISL3330 ISL3331 NO. OF PORTS 1 1 PACKAGE OPTIONS 20 Ld SSOP 40 Ld QFN (6mmx6mm) RS-485 DATA RATE (bps) 20M, 460k 20M, 460k, 115k RS-232 DATA RATE (kbps) 400 400 VL PIN? No Yes ACTIVE H or L Rx ENABLE? H Both LOW POWER SHUTDOWN? Yes Yes 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright (c) Intersil Americas Inc. 2008. All Rights Reserved. All other trademarks mentioned are the property of their respective owners. ISL3330, ISL3331 Ordering Information PART NUMBER (NOTE) ISL3330IAZ ISL3330IAZ-T* ISL3331IRZ ISL3331IRZ-T* PART MARKING 3330 IAZ 3330 IAZ ISL3331IRZ ISL3331IRZ TEMP. RANGE (C) -40 to +85 -40 to +85 -40 to +85 -40 to +85 PACKAGE (Pb-Free) 20 Ld SSOP 20 Ld SSOP (Tape and Reel) 40 Ld 6x6 QFN 40 Ld 6x6 QFN (Tape and Reel) PKG. DWG. # M20.209 M20.209 L40.6x6 L40.6x6 *Please refer to TB347 for details on reel specifications. NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. Pinouts ISL3330 (20 LD SSOP) TOP VIEW C1+ 1 C1- 2 V+ 3 20 C2+ 19 C218 VCC 17 RA 16 RB 15 DY 14 DZ/SLEW 13 ON 12 RXEN 11 V- A4 B5 Y6 Z7 485/232 8 DEN 9 GND 10 ISL3331 (40 LD QFN) TOP VIEW VCC C1+ C2+ C1C2NC NC NC NC 32 VL 31 30 RA 29 RB 28 DY 27 DZ/SLEW 26 NC 25 NC 24 NC 23 NC 22 NC 21 ON 11 485/232 12 DEN 13 NC 14 SPB 15 GND 16 GND 17 RXEN 18 NC 19 V20 RXEN 40 V+ A B Y Z NC NC NC NC NC 1 2 3 4 5 6 7 8 9 10 39 38 37 36 35 34 33 2 FN6361.0 May 20, 2008 ISL3330, ISL3331 TABLE 2. ISL3330 FUNCTION TABLE INPUTS 485/232 0 0 0 0 0 0 0 X 1 1 1 1 1 NOTES: 1. Charge pumps are on if in RS-232 mode and ON or DEN or RXEN are high. 2. Loopback is enabled when ON = 0, and DEN = RXEN = 1. ON 1 1 1 1 0 0 0 0 1 X X 1 0 RXEN 0 0 1 1 0 1 1 0 0 0 1 1 1 DEN SLEW 0 1 0 1 1 0 1 0 0 1 0 1 1 N/A N/A N/A N/A N/A N/A N/A X X 1/0 X 1/0 1/0 RECEIVER OUTPUTS RA High-Z High-Z ON ON High-Z High-Z ON High-Z High-Z High-Z ON ON ON RB High-Z High-Z ON ON High-Z ON ON High-Z High-Z High-Z High-Z High-Z High-Z DRIVER OUTPUTS Y High-Z ON High-Z ON ON ON ON High-Z High-Z ON High-Z ON ON Z High-Z ON High-Z ON High-Z High-Z ON High-Z High-Z ON High-Z ON ON DRIVER SPEED (Mbps) 0.46 0.46 0.46 0.46 0.46 20/0.46 20/0.46 20/0.46 CHARGE PUMPS (Note 1) ON ON ON ON ON ON ON OFF OFF OFF OFF OFF OFF LOOPBACK (Note 2) OFF OFF OFF OFF OFF OFF ON OFF OFF OFF OFF OFF ON MODE RS-232 RS-232 RS-232 RS-232 RS-232 RS-232 RS-232 Shutdown RS-485 RS-485 RS-485 RS-485 RS-485 ISL3330 Truth Tables RS-232 TRANSMITTING MODE INPUTS (ON = 1) 485/232 0 0 0 0 0 DEN 1 1 1 1 0 DY 0 0 1 1 X DZ 0 1 0 1 X OUTPUTS Y 1 1 0 0 High-Z Z 1 0 1 0 High-Z 485/232 1 1 1 1 1 DEN 1 1 1 1 0 RS-485 TRANSMITTING MODE INPUTS (ON = 1) DY 0 1 0 1 X SLEW 1 1 0 0 X Y 1 0 1 0 OUTPUTS Z 0 1 0 1 DATA RATE (Mbps) 20 20 0.46 0.46 - High-Z High-Z RS-232 RECEIVING MODE INPUTS (ON = 1) 485/232 0 0 0 0 0 0 RXEN 1 1 1 1 1 0 A 0 0 1 1 Open X B 0 1 0 1 Open X OUTPUT RA 1 1 0 0 1 High-Z RB 1 0 1 0 1 High-Z 485/232 1 1 1 1 RXEN 1 1 1 0 RS-485 RECEIVING MODE INPUTS (ON = 1) B-A -40mV -200mV Open or Shorted together X OUTPUT RA 1 0 1 High-Z RB High-Z High-Z High-Z High-Z 3 FN6361.0 May 20, 2008 ISL3330, ISL3331 TABLE 3. ISL3331 FUNCTION TABLE INPUTS RXEN AND/OR RXEN 1 and 0 1 and 0 0 or 1 0 or 1 1 and 0 0 or 1 0 or 1 1 and 0 1 and 0 1 and 0 1 and 0 0 or 1 0 or 1 0 or 1 0 or 1 0 or 1 RECEIVER OUTPUTS DRIVER OUTPUTS DRIVER DATA RATE (Mbps) 0.46 0.46 0.46 0.46 0.46 0.46/0.115 20 0.46/0.115 20 0.46/0.115 20 485/232 0 0 0 0 0 0 0 X 1 1 1 1 1 1 1 1 NOTES: ON 1 1 1 1 0 0 0 0 1 X X X 1 1 0 0 DEN 0 1 0 1 1 0 1 0 0 1 1 0 1 1 1 1 SLEW N/A N/A N/A N/A N/A N/A N/A X X 0 1 X 0 1 0 1 SPB N/A N/A N/A N/A N/A N/A N/A X X 1/0 X X 1/0 X 1/0 X RA High-Z High-Z ON ON High-Z High-Z ON High-Z High-Z High-Z High-Z ON ON ON ON ON RB High-Z High-Z ON ON High-Z ON ON High-Z High-Z High-Z High-Z High-Z High-Z High-Z High-Z High-Z Y High-Z ON High-Z ON ON ON ON High-Z High-Z ON ON High-Z ON ON ON ON Z High-Z ON High-Z ON High-Z High-Z ON High-Z High-Z ON ON High-Z ON ON ON ON CHARGE PUMPS (Note 3) ON ON ON ON ON ON ON OFF OFF OFF OFF OFF OFF OFF OFF OFF MODE RS-232 RS-232 RS-232 RS-232 RS-232 RS-232 RS-232 (Note 4) Shutdown RS-485 RS-485 RS-485 RS-485 RS-485 RS-485 RS-485 (Note 4) RS-485 (Note 4) 3. Charge pumps are on if in RS-232 mode and ON or DEN or RXEN is high, or RXEN is low. 4. Loopback is enabled when ON = 0, and DEN = 1, and (RXEN = 1 or RXEN = 0). ISL3331 Truth Tables RS-232 TRANSMITTING MODE INPUTS (ON = 1) 485/232 0 0 0 0 0 DEN 1 1 1 1 0 DY 0 0 1 1 X DZ 0 1 0 1 X OUTPUTS Y 1 1 0 0 High-Z Z 1 0 1 0 High-Z 485/232 1 1 1 1 DEN 1 1 1 0 RS-485 TRANSMITTING MODE INPUTS (ON = 1) SLEW 0 0 1 X SPB 0 1 X X DY 0/1 0/1 0/1 X OUTPUTS Y 1/0 1/0 1/0 Z 0/1 0/1 0/1 DATA Mbps 0.115 0.460 20 - High-Z High-Z RS-485 RECEIVING MODE INPUTS (ON = 1) OUTPUT B-A -40mV -200mV Open or Shorted together X RA 1 0 1 RB High-Z High-Z High-Z RS-232 RECEIVING MODE INPUTS (ON = 1) 485/232 RXEN and/or RXEN 0 0 0 0 0 0 0 or 1 0 or 1 0 or 1 0 or 1 0 or 1 1 and 0 A 0 0 1 1 Open X B 0 1 0 1 Open X OUTPUT RA 1 1 0 0 1 RB 1 0 1 0 1 485/232 RXEN and/or RXEN 1 1 1 1 0 or 1 0 or 1 0 or 1 1 and 0 High-Z High-Z High-Z High-Z 4 FN6361.0 May 20, 2008 ISL3330, ISL3331 Pin Descriptions PIN 485/232 DEN GND NC ON MODE BOTH BOTH BOTH BOTH BOTH FUNCTION Interface Mode Select input. High for RS-485 Mode and low for RS-232 Mode. Driver output enable. The driver outputs, Y and Z, are enabled by bringing DEN high. They are high impedance when DEN is low. Ground connection. No Connection. In RS-232 mode only, ON high enables the charge pumps. ON low, with DEN and RXEN low (and RXEN high if QFN), turns off the charge pumps (in RS-232 mode), and in either mode places the device in low power shutdown. In both modes, when ON is low, and DEN is high, and RXEN is high or RXEN is low, loopback is enabled. Receiver output enable. Rx is enabled when RXEN is high; Rx is high impedance when RXEN is low and, if using the QFN package, RXEN is high. When using the QFN and the active high Rx enable function, RXEN should be high or floating. Active low receiver output enable. Rx is enabled when RXEN is low; Rx is high impedance when RXEN is high and RXEN is low. (i.e., to use active low Rx enable function, tie RXEN to GND). For single signal Tx/Rx direction control, connect RXEN to DEN. Internally pulled high. (QFN only) System power supply input (3.3V). Logic-Level Supply. All TTL/CMOS inputs and outputs are powered by this supply. QFN logic input pins that are externally tied high in an application, should use the VL supply for the high voltage level. (QFN only) RXEN RXEN BOTH BOTH VCC VL A BOTH BOTH RS-232 Receiver input with 15kV ESD protection. A low on A forces RA high; A high on A forces RA low. RS-485 Inverting receiver input with 15kV ESD protection. B RS-232 Receiver input with 15kV ESD protection. A low on B forces RB high; A high on B forces RB low. RS-485 Noninverting receiver input with 15kV ESD protection. DY RS-232 Driver input. A low on DY forces output Y high. Similarly, a high on DY forces output Y low. RS-485 Driver input. A low on DY forces output Y high and output Z low. Similarly, a high on DY forces output Y low and output Z high. DZ/SLEW RS-232 Driver input. A low on DZ forces output Z high. Similarly, a high on DZ forces output Z low. RS-485 Slew rate control. With the SLEW pin high, the drivers run at the maximum slew rate (20Mbps). With the SLEW pin low, the drivers run at a reduced slew rate (460kbps). The QFN version works in conjunction with SPB to select one of three RS-485 data rates. Internally pulled high in RS-485 mode. SPB RA RS-485 Speed control. Works in conjunction with the SLEW pin to select the 20Mbps, 460kbps or 115kbps RS-485 data rate. Internally pulled high. (QFN only) RS-232 Receiver output. RS-485 Receiver output: If B > A by at least -40mV, RA is high; If B < A by -200mV or more, RA is low; RA = High if A and B are unconnected (floating) or shorted together (i.e., full fail-safe). RB RS-232 Receiver output. RS-485 Not used. Output is high impedance, and unaffected by RXEN and RXEN. Y RS-232 Driver output with 15kV ESD protection. RS-485 Inverting driver output with 15kV ESD protection. Z RS-232 Driver output with 15kV ESD protection. RS-485 Noninverting driver output with 15kV ESD protection. C1+ C1C2+ C2V+ VRS-232 External capacitor (voltage doubler) is connected to this lead. Not needed in RS-485 Mode. RS-232 External capacitor (voltage doubler) is connected to this lead. Not needed in RS-485 Mode. RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed in RS-485 Mode. RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed in RS-485 Mode. RS-232 Internally generated positive RS-232 transmitter supply (+5.5V). C3 not needed in RS-485 Mode. RS-232 Internally generated negative RS-232 transmitter supply (-5.5V). C4 not needed in RS-485 Mode. 5 FN6361.0 May 20, 2008 ISL3330, ISL3331 / Typical Operating Circuits +3.3V + +3.3V 0.1F 1 + 2 20 + 19 C1+ C1C2+ C218 VCC V+ 3 + C3 0.1F C4 0.1F + RA C1 0.1F C2 0.1F + + 0.1F 1 2 20 + 19 4 5k B1 VCC DY DZ 6 5 5k LB Rx RXEN D Y 12 15 DY DZ R 16 C1+ C1C2+ C2R 17 RA 18 VCC V+ 3 + C3 0.1F C4 0.1F + C1 0.1F C2 0.1F V- 11 V- 11 A 4 5k 5 5k R 17 A1 B 16 R 12 RXEN 15 RB RB Y 6 D VCC Z VCC 7 D 9 DEN 8 485/232 GND 10 NOTE: PINOUT FOR SSOP ON 14 Z VCC 7 9 D 14 13 DEN 8 485/232 GND 10 NOTE: PINOUT FOR SSOP ON 13 VCC RS-232 MODE WITHOUT LOOPBACK RS-232 MODE WITH LOOPBACK +3.3V + +3.3V 0.1F 1 C1+ C1C2+ C2R RXEN 6 15 7 D 18 VCC V+ 3 + C3 0.1F C4 0.1F + RA VCC 16 RB DY Y Z 14 9 SLEW C1 0.1F C2 0.1F A B + 0.1F 1 C1+ C1C2+ C2R 18 VCC V+ 3 + C3 0.1F C4 0.1F + RA C1 0.1F C2 0.1F + 2 20 + 2 20 + 19 4 5 V- 11 + 19 4 V- 11 A B 17 12 17 5 LB Rx RXEN 6 12 VCC 16 15 RB DY Y Z 7 D 14 9 SLEW VCC VCC 8 DEN 485/232 GND 10 NOTE: PINOUT FOR SSOP ON 13 VCC VCC VCC 8 DEN 485/232 GND 10 NOTE: PINOUT FOR SSOP ON 13 RS-485 MODE WITHOUT LOOPBACK RS-485 MODE WITH LOOPBACK 6 FN6361.0 May 20, 2008 ISL3330, ISL3331 Absolute Maximum Ratings (TA = +25C) VCC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V VL (QFN Only) . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to VCC + 0.5V Input Voltages All Except A,B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V Input/Output Voltages A, B (Any Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25V to +25V Y, Z (Any Mode, Note 5) . . . . . . . . . . . . . . . . . . . -12.5V to +12.5V RA, RB (Non-QFN Package) . . . . . . . . . . . -0.5V to (VCC + 0.5V) RA, RB (QFN Package) . . . . . . . . . . . . . . . . -0.5V to (VL + 0.5V) Output Short Circuit Duration Y, Z, RA, RB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table Thermal Information Thermal Resistance (Typical) JA (C/W) JC (C/W) 20 Ld SSOP Package (Note 6) . . . . . . 55 N/A 40 Ld QFN Package (Notes 7, 8). . . . . 31 2.5 Maximum Junction Temperature (Plastic Package) . . . . . . +150C Maximum Storage Temperature Range . . . . . . . . . -65C to +150C Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp Operating Conditions Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . -40C to +85C CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and result in failures not covered by warranty. NOTES: 5. One output at a time, IOUT 100mA for 10 minutes. 6. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details. 7. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with "direct attach" features. See Tech Brief TB379. 8. For JC, the "case temp" location is the center of the exposed metal pad on the package underside. Electrical Specifications Test Conditions: VCC = 3.15V to 3.45V, C1 to C4 = 0.1F, VL = VCC (for QFN only), Unless Otherwise Specified. Typicals are at VCC = 3.3V, TA = +25C (Note 9) SYMBOL TEST CONDITIONS TEMP MIN (C) (Note 15) TYP MAX (Note 15) UNITS PARAMETER DC CHARACTERISTICS - RS-485 DRIVER (485/232 = VCC) Driver Differential VOUT (no load) Driver Differential VOUT (with load) VOD1 VOD2 R = 50 (RS-422) (Figure 1) R = 27 (RS-485) (Figure 1) VOD3 Change in Magnitude of Driver Differential VOUT for Complementary Output States Driver Common-Mode VOUT Change in Magnitude of Driver Common-Mode VOUT for Complementary Output States Driver Short-Circuit Current, VOUT = High or Low Driver Three-State Output Leakage Current (Y, Z) VOD RD = 60, R = 375, VCM = -7V to 12V (Figure 1) R = 27 or 50 (Figure 1) Full Full Full Full Full 2 1.5 1.5 2.3 2 0.01 VCC 5 5 0.2 V V V V V VOC VOC R = 27 or 50 (Figure 1) R = 27 or 50 (Figure 1) Full Full - 0.01 3.0 0.2 V V IOS IOZ -7V (VY or VZ) 12V (Note 11) Outputs Disabled, VCC = 0V or 3.45V VOUT = 12V VOUT = -7V Full Full Full 35 -150 - 250 150 - mA A A DC CHARACTERISTICS - RS-232 DRIVER (485/232 = 0V) Driver Output Voltage Swing Driver Output Short-Circuit Current VO IOS All TOUTS Loaded with 3k to Ground VOUT = 0V Full Full 5.0 -60 60 V mA DC CHARACTERISTICS - LOGIC PINS (i.e., DRIVER AND CONTROL INPUT PINS) Input High Voltage VIH1 VIH2 VIH3 VIH4 VIH5 VL = VCC if QFN 2.7V VL < 3.0V (QFN Only) 2.3V VL < 2.7V (QFN Only) 1.6V VL < 2.3V (QFN Only) 1.2V VL < 1.6V (QFN Only) Full Full Full Full 25 2.2 2 1.6 0.7*VL 0.7*VL V V V V V 7 FN6361.0 May 20, 2008 ISL3330, ISL3331 Electrical Specifications Test Conditions: VCC = 3.15V to 3.45V, C1 to C4 = 0.1F, VL = VCC (for QFN only), Unless Otherwise Specified. Typicals are at VCC = 3.3V, TA = +25C (Note 9) (Continued) SYMBOL VIL1 VIL2 VIL3 VIL4 VIL5 VIL6 Input Current IIN1 IIN2 TEST CONDITIONS VL = VCC if QFN VL 2.7V (QFN Only) 2.3V VL < 2.7V (QFN Only) 1.6V VL < 2.3V (QFN Only) 1.3V VL < 1.6V (QFN Only) 1.2V VL < 1.3V (QFN Only) Except SLEW, RXEN (QFN), and SPB (QFN) SLEW (Note 13), RXEN (QFN), and SPB (QFN) TEMP MIN (C) (Note 15) Full Full Full Full 25 25 Full Full -2 -25 TYP 0.35*VL 0.25*VL MAX (Note 15) UNITS 0.8 0.8 0.7 0.35*VL 2 25 V V V V V V A A PARAMETER Input Low Voltage DC CHARACTERISTICS - RS-485 RECEIVER INPUTS (485/232 = VCC) Receiver Differential Threshold Voltage Receiver Input Hysteresis Receiver Input Current (A, B) VTH VTH IIN -7V VCM 12V, Full Failsafe VCM = 0V VCC = 0V or 3.15V to 3.45V VIN = 12V VIN = -7V Receiver Input Resistance RIN -7V VCM 12V, VCC = 0 (Note 12), or 3.15V VCC 3.45V Full 25 Full Full Full -0.2 -0.64 15 35 -0.04 0.8 V mV mA mA k DC CHARACTERISTICS - RS-232 RECEIVER INPUTS (485/232 = GND) Receiver Input Voltage Range Receiver Input Threshold VIN VIL VIH Receiver Input Hysteresis Receiver Input Resistance VTH RIN VIN = 15V, VCC Powered-Up (Note 12) Full Full Full 25 Full -25 2.4 3 1.1 1.6 0.5 5 25 0.8 7 V V V V k DC CHARACTERISTICS - RECEIVER OUTPUTS (485 OR 232 MODE) Receiver Output High Voltage VOH1 VOH2 VOH3 VOH4 Receiver Output Low Voltage Receiver Short-Circuit Current Receiver Three-State Output Current VOL IOSR IOZR IO = -1.5mA (VL = VCC if QFN) IO = -100A, VL 1.2V (QFN Only) IO = -500A, VL = 1.5V (QFN Only) IO = -150A, VL = 1.2V (QFN Only) IO = 5mA 0V VO VCC Output Disabled, 0V VO VCC (or VL for QFN) Full Full Full Full Full Full Full VCC - 0.4 VL - 0.1 1.2 1.0 7 0.2 0.4 85 10 V V V V V mA A POWER SUPPLY CHARACTERISTICS No-Load Supply Current (Note 10) ICC232 ICC485 Shutdown Supply Current 485/232 = 0V, ON = VCC 485/232 = VCC, ON = VCC Full Full Full Full 3.7 1.3 10 30 7 5 30 60 mA mA A A ISHDN232 ON = DEN = RXEN = 0V (RXEN = SPB = VL if QFN) ISHDN485 ON = DEN = RXEN = SLEW = 0V (RXEN = VL, SPB = 0V if QFN) ESD CHARACTERISTICS Bus Pins (A, B, Y, Z) Any Mode All Other Pins Human Body Model Human Body Model Machine Model 25 25 25 15 2.5 200 kV kV V 8 FN6361.0 May 20, 2008 ISL3330, ISL3331 Electrical Specifications Test Conditions: VCC = 3.15V to 3.45V, C1 to C4 = 0.1F, VL = VCC (for QFN only), Unless Otherwise Specified. Typicals are at VCC = 3.3V, TA = +25C (Note 9) (Continued) SYMBOL TEST CONDITIONS TEMP MIN (C) (Note 15) TYP MAX (Note 15) UNITS PARAMETER RS-232 DRIVER and RECEIVER SWITCHING CHARACTERISTICS (485/232 = 0V, ALL VERSIONS AND SPEEDS) Driver Output Transition Region Slew Rate Driver Output Transition Time Driver Propagation Delay SR RL = 3k, Measured From 3V to -3V or -3V to 3V CL 15pF CL 2500pF Full Full Full Full Full tDPHL - tDPLH (Figure 6) Full 25 RL = 5k, Measured at VOUT = 3V VOUT = 3.0V (Note 14) RL = 3k, CL = 1000pF, One Transmitter Switching CL = 15pF (Figure 7) tRPHL - tRPLH (Figure 7) CL = 15pF CL = 15pF, SW = VCC (Figure 5) CL = 15pF, SW = GND (Figure 5) CL = 15pF, SW = VCC (Figure 5) CL = 15pF, SW = GND (Figure 5) 25 25 Full Full Full Full Full Full Full Full Full 25 25 4 0.22 250 0.46 20 12 1.2 1 1.2 300 1200 500 25 400 40 60 20 2 18 18 22 22 60 20 30 3.1 2 2 450 120 120 40 V/s V/s s s s ns ns ns s kbps ns ns ns Mbps ns ns ns ns ns ns tr, tf tDPHL tDPLH RL = 3k, CL = 2500pF, 10% to 90% RL = 3k, CL = 1000pF (Figure 6) Driver Propagation Delay Skew Driver Enable Time Driver Disable Time Driver Enable Time from Shutdown Driver Maximum Data Rate Receiver Propagation Delay tDSKEW tDEN tDDIS tDENSD DRD tRPHL tRPLH Receiver Propagation Delay Skew Receiver Maximum Data Rate Receiver Enable to Output Low Receiver Enable to Output High Receiver Disable from Output Low Receiver Disable from Output High Receiver Enable from Shutdown to Output Low Receiver Enable from Shutdown to Output High tRSKEW DRR tZL tZH tLZ tHZ tZLSHDN CL = 15pF, SW = VCC (Figure 5, Note 14) tZHSHDN CL = 15pF, SW = GND (Figure 5, Note 14) RS-485 DRIVER SWITCHING CHARACTERISTICS (FAST DATA RATE (20Mbps), 485/232 = VCC, SLEW = VCC, ALL VERSIONS) Driver Differential Input to Output Delay Driver Output Skew Driver Differential Rise or Fall Time Driver Enable to Output Low Driver Enable to Output High Driver Disable from Output Low Driver Disable from Output High Driver Enable from Shutdown to Output Low Driver Enable from Shutdown to Output High Driver Maximum Data Rate tDLH, tDHL RDIFF = 54, CL = 100pF (Figure 2) tSKEW tR, tF tZL tZH tLZ tHZ RDIFF = 54, CL = 100pF (Figure 2) RDIFF = 54, CL = 100pF (Figure 2) CL = 100pF, SW = VCC (Figure 3) CL = 100pF, SW = GND (Figure 3) CL = 15pF, SW = VCC (Figure 3) CL = 15pF, SW = GND (Figure 3) Full Full Full Full Full Full Full Full Full Full 10 3 20 20 2 20 28 39 30 25 100 290 35 35 10 30 60 60 60 60 250 375 ns ns ns ns ns ns ns ns ns Mbps tZL(SHDN) RL = 500, CL = 100pF, SW = VCC (Figure 3, Note 14) tZH(SHDN) RL = 500, CL = 100pF, SW = GND (Figure 3, Note 14) fMAX RDIFF = 54, CL = 100pF (Figure 2) RS-485 DRIVER SWITCHING CHARACTERISTICS (MEDIUM DATA RATE (460kbps), 485/232 = VCC, SLEW = 0V, SPB (QFN Only) = VCC, ALL VERSIONS) Driver Differential Input to Output Delay Driver Output Skew Driver Differential Rise or Fall Time tDLH, tDHL RDIFF = 54, CL = 100pF (Figure 2) tSKEW tR, tF RDIFF = 54, CL = 100pF (Figure 2) RDIFF = 54, CL = 100pF (Figure 2) Full Full Full 200 300 500 10 660 1000 150 1100 ns ns ns 9 FN6361.0 May 20, 2008 ISL3330, ISL3331 Electrical Specifications Test Conditions: VCC = 3.15V to 3.45V, C1 to C4 = 0.1F, VL = VCC (for QFN only), Unless Otherwise Specified. Typicals are at VCC = 3.3V, TA = +25C (Note 9) (Continued) SYMBOL tZL tZH tLZ tHZ TEST CONDITIONS CL = 100pF, SW = VCC (Figure 3) CL = 100pF, SW = GND (Figure 3) CL = 15pF, SW = VCC (Figure 3) CL = 15pF, SW = GND (Figure 3) TEMP MIN (C) (Note 15) Full Full Full Full Full Full Full 460 TYP 42 350 30 25 2000 MAX (Note 15) UNITS 100 450 60 60 500 750 ns ns ns ns ns ns kbps PARAMETER Driver Enable to Output Low Driver Enable to Output High Driver Disable from Output Low Driver Disable from Output High Driver Enable from Shutdown to Output Low Driver Enable from Shutdown to Output High Driver Maximum Data Rate tZL(SHDN) RL = 500, CL = 100pF, SW = VCC (Figure 3, Note 14) tZH(SHDN) RL = 500, CL = 100pF, SW = GND (Figure 3, Note 14) fMAX RDIFF = 54, CL = 100pF (Figure 2) RS-485 DRIVER SWITCHING CHARACTERISTICS (SLOW DATA RATE (115kbps, QFN ONLY), 485/232 = VCC, SLEW = SPB = GND) Driver Differential Input to Output Delay Driver Output Skew Driver Differential Rise or Fall Time Driver Enable to Output Low Driver Enable to Output High Driver Disable from Output Low Driver Disable from Output High Driver Enable from Shutdown to Output Low Driver Enable from Shutdown to Output High Driver Maximum Data Rate tDLH, tDHL RDIFF = 54, CL = 100pF (Figure 2) tSKEW tR, tF tZL tZH tLZ tHZ RDIFF = 54, CL = 100pF (Figure 2) RDIFF = 54, CL = 100pF (Figure 2) CL = 100pF, SW = VCC (Figure 3) CL = 100pF, SW = GND (Figure 3) CL = 15pF, SW = VCC (Figure 3) CL = 15pF, SW = GND (Figure 3) Full Full Full Full Full Full Full Full Full Full 800 1000 115 1600 250 1700 45 910 35 29 800 2500 500 3100 100 1200 60 60 800 1500 ns ns ns ns ns ns ns ns ns kbps tZL(SHDN) RL = 500, CL = 100pF, SW = VCC (Figure 3, Note 14) tZH(SHDN) RL = 500, CL = 100pF, SW = GND (Figure 3, Note 14) fMAX RDIFF = 54, CL = 100pF (Figure 2) RS-485 RECEIVER SWITCHING CHARACTERISTICS (485/232 = VCC, ALL VERSIONS AND SPEEDS) Receiver Input to Output Delay Receiver Skew | tPLH - tPHL | Receiver Maximum Data Rate Receiver Enable to Output Low Receiver Enable to Output High Receiver Disable from Output Low Receiver Disable from Output High Receiver Enable from Shutdown to Output Low Receiver Enable from Shutdown to Output High NOTES: 9. All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise specified. 10. Supply current specification is valid for loaded drivers when DEN = 0V. 11. Applies to peak current. See "Typical Performance Curves" beginning on page 19 for more information. 12. RIN defaults to RS-485 mode (>15k) when the device is unpowered (VCC = 0V), or in SHDN, regardless of the state of the 485/232 pin. 13. The Slew pin has a pull-up resistor that enables only when in RS-485 mode (485/232 = VCC). 14. ON, RXEN, and DEN all simultaneously switched Low-to-High. 15. Parameters with MIN and/or MAX limits are 100% tested at +25C, unless otherwise specified. Temperature limits established by characterization and are not production tested. tPLH, tPHL (Figure 4) tSKEW fMAX tZL tZH tLZ tHZ CL = 15pF, SW = VCC (Figure 5) CL = 15pF, SW = GND (Figure 5) CL = 15pF, SW = VCC (Figure 5) CL = 15pF, SW = GND (Figure 5) (Figure 4) Full Full Full Full Full Full Full Full Full 20 20 45 3 40 15 15 20 20 500 500 70 10 60 60 60 60 900 900 ns ns Mbps ns ns ns ns ns ns tZLSHDN CL = 15pF, SW = VCC (Figure 5, Note 14) tZHSHDN CL = 15pF, SW = GND (Figure 5, Note 14) 10 FN6361.0 May 20, 2008 ISL3330, ISL3331 Test Circuits and Waveforms R VCC DEN DY Y D Z R VOC RD VOD + - VCM FIGURE 1. RS-485 DRIVER VOD AND VOC TEST CIRCUIT 3V DY CL = 100pF Y D Z SIGNAL GENERATOR OUT (Y) tDLH DIFF OUT (Z - Y) tR SKEW = |tPLH (Y OR Z) - tPHL (Z OR Y)| 90% 10% 0V RDIFF CL = 100pF tPHL 50% tDHL 0V 90% 10% tF +VOD -VOD tPLH VOH 50% VOL 1.5V 1.5V 0V DEN DY tPLH OUT (Z) 50% tPHL VOH 50% VOL VCC FIGURE 2A. TEST CIRCUIT FIGURE 2B. MEASUREMENT POINTS FIGURE 2. RS-485 DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES DEN DY SIGNAL GENERATOR Y D Z CL 500 SW VCC GND ENABLED DEN 1.5V 1.5V 0V tZH(SHDN) FOR SHDN TESTS, SWITCH ON AND DEN L- H SIMULTANEOUSLY OUT (Y, Z) tZH OUTPUT HIGH 2.3V tHZ VOH - 0.5V VOH 0V tZL tZL(SHDN) OUT (Y, Z) 2.3V OUTPUT LOW tLZ VCC VOL + 0.5V V OL 3V PARAMETER OUTPUT tHZ tLZ tZH tZL tZH(SHDN) tZL(SHDN) Y/Z Y/Z Y/Z Y/Z Y/Z Y/Z RXEN X X X X 0 0 DY 0/1 1/0 0/1 1/0 0/1 1/0 SW GND VCC GND VCC GND VCC CL (pF) 15 15 100 100 100 100 FIGURE 3B. MEASUREMENT POINTS FIGURE 3A. TEST CIRCUIT FIGURE 3. RS-485 DRIVER ENABLE AND DISABLE TIMES 11 FN6361.0 May 20, 2008 ISL3330, ISL3331 Test Circuits and Waveforms (Continued) VCC 0V RXEN A B R RA 15pF +1.5V B 0V tPLH 0V -1.5V tPHL VCC RA 1.5V 1.5V 0V SIGNAL GENERATOR FIGURE 4A. TEST CIRCUIT FIGURE 4B. MEASUREMENT POINTS FIGURE 4. RS-485 RECEIVER PROPAGATION DELAY RXEN A R SIGNAL GENERATOR B RA 1k SW 15pF tZH(SHDN) FOR SHDN TESTS, SWITCH ON AND RXEN L- H SIMULTANEOUSLY RA tZL tZL(SHDN) RA 1.5V OUTPUT LOW tZH OUTPUT HIGH 1.5V tHZ VOH - 0.5V VOH 0V tLZ VCC VOL + 0.5V V OL VCC GND ENABLED RXEN 1.5V 1.5V 3V 0V PARAMETER tHZ tLZ tZH tZL tZH(SHDN) tZL(SHDN) DEN X X X X 0 0 B (V) +1.5 -1.5 +1.5 -1.5 +1.5 -1.5 SW GND VCC GND VCC GND VCC FIGURE 5B. MEASUREMENT POINTS FIGURE 5A. TEST CIRCUIT FIGURE 5. RS-485 RECEIVER ENABLE AND DISABLE TIMES VCC DEN DY,Z Y, Z CL 3V DY,Z D 1.5V 1.5V 0V tDPHL RL OUT (Y,Z) SKEW = |tDPHL - tDPLH| 0V 0V VOtDPLH VO+ SIGNAL GENERATOR FIGURE 6A. TEST CIRCUIT FIGURE 6B. MEASUREMENT POINTS FIGURE 6. RS-232 DRIVER PROPAGATION DELAY VCC RXEN A, B RA, RB CL = 15pF 3V A, B R 50% 50% 0V tRPHL RA, RB SKEW = |tRPHL - tRPLH| tRPLH VOH 50% 50% VOL SIGNAL GENERATOR FIGURE 7A. TEST CIRCUIT FIGURE 7B. MEASUREMENT POINTS FIGURE 7. RS-232 RECEIVER PROPAGATION DELAY 12 FN6361.0 May 20, 2008 ISL3330, ISL3331 Detailed Description The ISL333x port supports dual protocols: RS-485/RS-422, and RS-232. RS-485 and RS-422 are differential (balanced) data transmission standards for use in high speed (up to 20Mbps) networks, or long haul and noisy environments. The differential signalling, coupled with RS-485's requirement for an extended common mode range (CMR) of +12V to -7V make these transceivers extremely tolerant of ground potential differences, as well as voltages induced in the cable by external fields. Both of these effects are real concerns when communicating over the RS-485/RS-422 maximum distance of 4000' (1220m). It is important to note that the ISL333x don't follow the RS-485 convention whereby the inverting I/O is labeled "B/Z", and the non inverting I/O is "A/Y". Thus, in the application diagrams, see Figures 8 and 9, the 333x A/Y (B/Z) pins connect to the B/Z (A/Y) pins of the generic RS-485/RS-422 ICs. The RS-422 is typically a point-to-point (one driver talking to one receiver on a bus), or a point-to-multipoint (multidrop) standard that allows only one driver and up to 10 receivers on each bus. Because of the one driver per bus limitation, RS-422 networks use a two bus, full duplex structure for bidirectional communication, and the Rx inputs and Tx outputs (no tri-state required) connect to different busses, as shown in Figure 9. The Tx and Rx enables aren't required, so connect RXEN and DEN to VCC through a 1k resistor. Conversely, RS-485 is a true multipoint standard, which allows up to 32 devices (any combination of drivers that must be tri-statable and receivers) on each bus. Now bidirectional communication takes place on a single bus, so the Rx inputs and Tx outputs of a port connect to the same bus lines, as shown in Figure 8. A port set to RS-485/RS-422 mode includes one Rx and one Tx. See Application Note AN1401 for details about implementing a three pin, selectable RS-232/half-duplex RS-485 port. RS-232 is a point-to-point, singled ended (signal voltages referenced to GND) communication protocol targeting fairly short (< 150', 46m) and low data rate (<1Mbps) applications. A port contains two transceivers (2 Tx and 2 Rx) in RS-232 mode. Protocol selection is handled via the 485/232 logic pin. GENERIC 1/2 DUPLEX 485 XCVR RO RE DE DI D 0.1F GND B/Z A/Y Y D Z GND RT B/Z A/Y RT GND D + GENERIC 1/2 DUPLEX 485 XCVR +5V + VCC R RO RE DE DI +3.3V ISL333x VCC RA RXEN* Tx/Rx DEN DY R B A + 0.1F 0.1F R +5V VCC *QFN ONLY, CONNECT RXEN TO GND FIGURE 8. TYPICAL HALF DUPLEX RS-485 NETWORK GENERIC 422 Rx (SLAVE) RO RE GENERIC FULL DUPLEX 422 XCVR (SLAVE) +5V R 0.1F VCC D Z Y A R B GND RT +5V VCC GND B A RT A B Z Y GND D DI 0.1F + + +3.3V ISL3330 (MASTER) 1k DY DEN RXEN RA + 0.1F VCC R RO FIGURE 9. TYPICAL RS-422 NETWORK 13 FN6361.0 May 20, 2008 ISL3330, ISL3331 ISL333x Advantages These dual protocol ICs offer many parametric improvements vs those offered on competing dual protocol devices. Some of the major improvements are: * 3.3V Supply Voltage - Eliminates the 5V supply that powers just the interface IC * 15kV Bus Pin ESD - Eases board level requirements * Full Failsafe RS-485 Rx - Eliminates bus biasing * Selectable RS-485 Data Rate - Up to 20Mbps, or slew rate limited for low EMI and fewer termination issues * High RS-232 Data Rate - >250kbps * Lower Tx and Rx Skews - Wider, consistent bit widths * Lower ICC - Max ICC is 2x to -4x lower than competition * Flow-Thru Pinouts - Tx, Rx bus pins on one side/logic pins on the other, for easy routing to connector/UART * Packaging - Smaller (QFN) and Pb-free. DEN pin, in SHDN (see Tables 2 and 3, and the "Low Power Shutdown (SHDN) Mode" on page 16), or when the 3.3V power supply is off. Because RS-232 is a point-to-point (only one Tx allowed on the bus) standard, the main use for this DEN disable function is to reduce power by eliminating the load current (approximately 1mA per Tx output) through the 5k resistor in the Rx at the cable's far end. CHARGE PUMPS The on-chip charge pumps create the RS-232 transmitter power supplies (typically +5.7/-5.3V) from a single supply as low as 3.15V, and are enabled only if the port is configured for RS-232 operation, and not in SHDN. The efficient design requires only four small 0.1F capacitors for the voltage doubler and inverter functions. By operating discontinuously (i.e., turning off as soon as V+ and V- pump up to the nominal values), the charge pump contribution to RS-232 mode ICC is reduced significantly. Unlike competing devices that require the charge pump in RS-485 mode, disabling the charge pump saves power, and minimizes noise. If the application is a dedicated RS-485 port, then the charge pump capacitors aren't even required. DATA RATES AND CABLING Drivers operate at data rates up to 400kbps, and are guaranteed for data rates up to 250kbps. The charge pumps and drivers are designed such that one driver can be operated at the rated load, and at 250kbps (see Figure 33). Figure 33 also shows that drivers can easily drive several thousands of picofarads at data rates up to 250kbps, while still delivering compliant 5V output levels. Receivers operate at data rates up to 2Mbps. They are designed for a higher data rate to facilitate faster factory downloading of software into the final product, thereby improving the user's manufacturing throughput. Figures 36 and 37 illustrate driver and receiver waveforms at 250kbps, and 400kbps, respectively. For these graphs, one driver drives the specified capacitive load, and a receiver. RS-232 doesn't require anything special for cabling; just a single bus wire per transmitter and receiver, and another wire for GND. So an ISL333x RS-232 port uses a five conductor cable for interconnection. Bus terminations are not required, nor allowed, by the RS-232 standard. RS-232 Mode RX FEATURES RS-232 receivers invert and convert RS-232 input levels (3V to 25V) to the standard TTL/CMOS levels required by a UART, ASIC, or controller serial port. Receivers are designed to operate at faster data rates than the drivers, and they feature very low skews (20ns) so the receivers contribute negligibly to bit width distortion. Inputs include the standards required 3k to 7k pull-down resistor, so unused inputs may be left unconnected. Rx inputs also have built-in hysteresis to increase noise immunity and to decrease erroneous triggering due to slowly transitioning input signals. Rx outputs are short circuit protected, and are tri-statable via the active high RXEN pin, when the IC is shutdown (SHDN; see Tables 2 and 3, and the "Low Power Shutdown (SHDN) Mode" on page 16), or via the active low RXEN pin available on the QFN package option (see "ISL3331 (QFN Package) Special Features" on page 17). TX FEATURES RS-232 drivers invert and convert the standard TTL/CMOS levels from a UART, or controller serial port to RS-232 compliant levels (5V minimum). The Tx delivers these compliant output levels even at data rates of 400kbps, and with loads of 1000pF. The drivers are designed for low skew (typically 12% of the 400kbps bit width), and are compliant to the RS-232 slew rate specification (4V to 30V/s) for a wide range of load capacitances. Tx inputs float if left unconnected and may cause ICC increases. For the best results, connect unused inputs to GND. Tx outputs are short circuit protected, and incorporate a thermal SHDN feature to protect the IC in situations of severe power dissipation. See the "RS-485 Mode" on page 14 for more details. Drivers disable via the active high RS-485 Mode RX FEATURES RS-485 receivers convert differential input signals as small as 200mV, as required by the RS-485 and RS-422 standards, to TTL/CMOS output levels. The differential Rx provides maximum sensitivity, noise immunity, and common mode rejection. Per the RS-485 standard, receiver inputs function with common mode voltages as great as +12V and -7V, regardless of supply voltage, making them ideal for long networks where induced voltages are a realistic concern. 14 FN6361.0 May 20, 2008 ISL3330, ISL3331 Each RS-485/422 port includes a single receiver (RA), and the unused Rx output (RB) is disabled. Worst case receiver input currents are 20% lower than the 1 "unit load" (1mA) RS-485 limit, which translates to a 15k minimum input resistance. These receivers include a "full fail-safe" function that guarantees a high level receiver output if the receiver inputs are unconnected (floating), shorted together, or if the bus is terminated but undriven (i.e., differential voltage collapses to near zero due to termination). Failsafe with shorted or terminated and undriven inputs is accomplished by setting the Rx upper switching point at -40mV, thereby ensuring that the Rx recognizes a 0V differential as a high level. All the Rx outputs are short circuit protected, and are tri-statable via the active high RXEN pin, or when the IC is shutdown (see Tables 2 and 3, and the "Low Power Shutdown (SHDN) Mode" on page 16). ISL3331 (QFN) receiver outputs are also tri-statable via an active low RXEN input (see "ISL3331 (QFN Package) Special Features" on page 17). For the ISL3331 (QFN), when using the active high RXEN function, the RXEN pin may be left floating (internally pulled high), or should be connected to VCC through a 1k resistor. If using the active low RXEN, then the RXEN pin must be connected to GND. TX FEATURES The RS-485/RS-422 driver is a differential output device that delivers at least 1.5V across a 54 load (RS-485), and at least 2V across a 100 load (RS-422). The drivers feature low propagation delay skew to maximize bit widths, and to minimize EMI. To allow multiple drivers on a bus, the RS-485 specification requires that drivers survive worst case bus contentions undamaged. The ISL333x drivers meet this requirement via driver output short circuit current limits, and on-chip thermal shutdown circuitry. The output stages incorporate current limiting circuitry that ensures that the output current never exceeds the RS-485 specification, even at the common mode voltage range extremes of 12V and -7V. In the event of a major short circuit condition, devices also include a thermal shutdown feature that disables the drivers whenever the die temperature becomes excessive. This eliminates the power dissipation, allowing the die to cool. The drivers automatically re-enable after the die temperature drops about +15C. If the contention persists, the thermal shutdown/re-enable cycle repeats until the fault is cleared. Receivers stay operational during thermal shutdown. The RS-485 multi-driver operation also requires drivers to include tri-state functionality, where the port has a DEN pin to control this function. If the driver is used in an RS-422 network, such that driver tri-state isn't required, then the DEN pin should connect to VCC through a 1k resistor. Drivers are also tri-stated when the IC is in SHDN, or when the 3.3V power supply is off. SPEED OPTIONS The ISL3330 (SSOP) features two speed options that are user selectable via the SLEW pin: a high slew rate setting optimized for 20Mbps data rates (Fast), and a slew rate limited option for operation up to 460kbps (Med). The ISL3331 (QFN) offers an additional, more slew rate limited, option for data rates up to 115kbps (Slow). See the "Data Rate" and "RS-485 Slew Rate Limited Data Rates" on page 17 for more information. Receiver performance is the same for all three speed options. DATA RATE, CABLES, AND TERMINATIONS RS-485/RS-422 are intended for network lengths up to 4000' (1220m), but the maximum system data rate decreases as the transmission length increases. Devices operating at the maximum data rate of 20Mbps are limited to lengths of 20' to 30' (6m to 9m), while devices operating at or below 115kbps can operate at the maximum length of 4000' (1220m). Higher data rates require faster edges, so both the ISL333x versions offer an edge rate capable of 20Mbps data rates. They both have a second option for 460kbps, but the ISL3331 also offers another, very slew rate limited, edge rate to minimize problems at slow data rates. Nevertheless, for the best jitter performance when driving long cables, the faster speed settings may be preferable, even at low data rates. See the "RS-485 Slew Rate Limited Data Rates" on page 17 for details. Twisted pair is the cable of choice for RS-485/RS-422 networks. Twisted pair cables tend to pick-up noise and other electromagnetically induced voltages as common mode signals, which are effectively rejected by the differential receivers in these ICs. The preferred cable connection technique is "daisy-chaining", where the cable runs from the connector of one device directly to the connector of the next device, such that cable stub lengths are negligible. A "backbone" structure, where stubs run from the main backbone cable to each device's connector, is the next best choice, but care must be taken to ensure that each stub is electrically "short". See Table 4 for recommended maximum stub lengths for each speed option. TABLE 4. RECOMMENDED STUB LENGTHS SPEED OPTION SLOW MED FAST MAXIMUM STUB LENGTH ft. (m) 350 to 500 (107 to 152) 100 to 150 (30.5 to 46) 1 to 3 (0.3 to 0.9) 15 FN6361.0 May 20, 2008 ISL3330, ISL3331 Proper termination is imperative to minimize reflections when using the 20Mbps speed option. Short networks using the medium and slow speed options need not be terminated, but terminations are recommended unless power dissipation is an overriding concern. Note that the RS-485 specification allows a maximum of two terminations on a network, otherwise the Tx output voltage may not meet the required VOD. In point-to-point, or point-to-multipoint (RS-422) networks, the main cable should be terminated in its characteristic impedance (typically 120) at the end farthest from the driver. In multi-receiver applications, stubs connecting receivers to the main cable should be kept as short as possible, but definitely shorter than the limits shown in Table 4. Multipoint (RS-485) systems require that the main cable be terminated in its characteristic impedance at both ends. Again, keep stubs connecting a transceiver to the main cable as short as possible (refer to Table 4). Avoid "star", and other configurations, where there are many "ends" which would require more than the two allowed terminations to prevent reflections. disables the charge pumps if the port is in RS-232 mode, so V+ collapses to VCC, and V- collapses to GND. All but 10A of SHDN ICC current is due to control input (SPB, SLEW) pull-up resistors (~10A/resistor), so SHDN ICC varies depending on the ISL333x configuration. The specification tables indicate the worst case values, but careful selection of the configuration yields lower currents. For example, in RS-232 mode the SPB pin isn't used, so floating it or tying it high minimizes SHDN ICC. ISL3330 CONNECTOR A B Y Z R RA D UART OR ASIC OR CONTROLLER DY High ESD All pins on the ISL333x include ESD protection structures rated at 2.5kV (HBM), which is good enough to survive ESD events commonly seen during manufacturing. But the bus pins (Tx outputs and Rx inputs) are particularly vulnerable to ESD events because they connect to an exposed port on the exterior of the finished product. Simply touching the port pins, or connecting a cable, can destroy an unprotected port. ISL333x bus pins are fitted with advanced structures that deliver ESD protection in excess of 15kV (HBM), without interfering with any signal in the RS-485 or the RS-232 range. This high level of protection may eliminate the need for board level protection, or at the very least will increase the robustness of any board level scheme. FIGURE 10. ILLUSTRATION OF FLOW-THROUGH PINOUT When enabling from SHDN in RS-232 mode, allow at least 25s for the charge pumps to stabilize before transmitting data. If fast enables are required, and ICC isn't the greatest concern, disable the drivers with the DEN pin to keep the charge pumps active. The charge pumps aren't used in RS-485 mode, thus the transceiver is ready to send or receive data in less than 2s, which is much faster than competing devices that require the charge pump for all modes of operation. Internal Loopback Mode Setting ON = 0, DEN = 1, and RXEN = 1 or RXEN = 0 (QFN only), places the port in the loopback mode, a mode that facilitates implementing board level self test functions. In loopback, internal switches disconnect the Rx inputs from the Rx outputs, and feed back the Tx outputs to the appropriate Rx output. This way the data driven at the Tx input appears at the corresponding Rx output (refer to "Typical Operating Circuits" on page 6). The Tx outputs remain connected to their terminals, so the external loads are reflected in the loopback performance. This allows the loopback function to potentially detect some common bus faults such as one or both driver outputs shorted to GND, or outputs shorted together. Note that the loopback mode uses an additional set of receivers, as shown in the "Typical Operating Circuits" on page 6. These loopback receivers are not standards compliant, so the loopback mode can't be used to implement a half-duplex RS-485 transceiver. See Application Note AN1401 for specific details on implementing a 3-pin, half duplex, dual protocol port. Small Packages Competing 3.3V dual protocol ICs are available only in a 20 Ld or 24 Ld SSOP. The ISL3331's tiny 6mmx6mm QFN footprint is 36% to 44% smaller than the competing SSOPs. Flow-Through Pinouts Even the ISL333x pinouts are features, in that the "flow-through" design simplifies board layout. Having the bus pins all on one side of the package for easy routing to a cable connector, and the Rx outputs and Tx inputs on the other side for easy connection to a UART, avoids costly and problematic crossovers. Figure 10 illustrates the flow-through nature of the pinout. Low Power Shutdown (SHDN) Mode The ISL333x enter the SHDN mode when ON = 0, and the Tx and Rx are disabled (DEN = 0, RXEN = 0, and RXEN = 1) and the already low supply current drops to as low as 10A. SHDN disables the Tx and Rx outputs, and 16 FN6361.0 May 20, 2008 ISL3330, ISL3331 ISL3331 (QFN Package) Special Features Logic Supply (VL Pin) The ISL3331 (QFN) includes a VL pin that powers the logic inputs (Tx inputs and control pins) and Rx outputs. These pins interface with "logic" devices such as UARTs, ASICs, and controllers, and today many of these devices use power supplies significantly lower than 3.3V. Thus, a 3.3V output level from a 3.3V powered dual protocol IC might seriously overdrive and damage the logic device input. Similarly, the logic device's low VOH might not exceed the VIH of a 3.3V powered dual protocol input. Connecting the VL pin to the power supply of the logic device (as shown in Figure 11) limits the ISL3331's Rx output VOH to VL (see Figure 14) and reduces the Tx and control input switching points to values compatible with the logic device output levels. Tailoring the logic pin input switching points and output levels to the supply voltage of the UART, ASIC, or controller eliminates the need for a level shifter/translator between the two ICs. VCC = +3.3V VCC = +2V . TABLE 5. VIH AND VIL vs VL FOR VCC = 3.3V VL (V) 1.2 1.5 1.8 2.3 2.7 3.3 VIH (V) 0.85 0.9 0.9 1.2 1.4 1.8 VIL (V) 0.26 0.5 0.73 1.0 1.3 1.7 Note: With VL 1.6V, the ISL3331 may not operate at the full data rate unless the logic signal VIL is at least 0.2V below the typical value listed in Table 5. The VL supply current (IL) is typically less than 35A, as shown in Figures 19 and 20. All of the DC VL current is due to inputs with internal pull-up resistors (SPB, SLEW, RXEN) being driven to the low input state. The worst case IL current occurs when all three of the inputs are low (see Figure 19), due to the IL through the pull-up resistors. IIL through an input pull-up resistor is ~10A, so the IL in Figure 19 drops by about 18A (at VL = 3.3V) when the SPB is high and 232 mode disables the SLEW pin pull-up (middle vs top curve). When all three inputs are driven high, IL drops to ~10nA. Thus, to minimize power dissipation, drive these inputs high when unneeded (e.g., SPB isn't used in RS-232 mode, so drive it high). QFN logic input pins that are externally tied high in an application, should use the VL supply for the high voltage level. RA VOH = 3.3V RXD ESD DIODE DY GND VIH 2 VOH 2 TXD GND ISL3330 VCC = +3.3V UART/PROCESSOR VCC = +2V Active Low Rx Enable (RXEN) In many RS-485 applications, especially half duplex configurations, users like to accomplish "echo cancellation" by disabling the corresponding receiver while its driver is transmitting data. This function is available on the QFN package via an active low RXEN pin. The active low function also simplifies direction control by allowing a single Tx/Rx direction control line. If the active high RXEN were used, either two valuable I/O pins would be used for direction control, or an external inverter is required between DEN and RXEN. Figure 12 details the advantage of using the RXEN pin. When using RXEN, ensure that RXEN is tied to GND. VL RA VOH = 2V RXD ESD DIODE DY GND VIH = 1.4V VOH 2 TXD GND RS-485 Slew Rate Limited Data Rates ISL3331 UART/PROCESSOR FIGURE 11. USING VL PIN TO ADJUST LOGIC LEVELS VL can be anywhere from VCC down to 1.2V, but the input switching points may not provide enough noise margin when VL < 1.5V. Table 5 indicates typical VIH and VIL values for various VL voltages so the user can ascertain whether or not a particular VL voltage meets his needs. The ISL333x FAST speed option (SLEW = High) utilizes Tx output transitions optimized for a 20Mbps data rate. These fast edges may increase EMI and reflection issues, even though fast transitions aren't required at the lower data rates used by many applications. With the SLEW pin low, both product types switch to a moderately slew rate limited output transition targeted for 460kbps (MED) data rates. The ISL3331 (QFN version), offers an additional slew rate limited data rate that is optimized for 115kbps (SLOW), and is selected when SLEW = 0 and SPB = 0 (see Table 3). The 17 FN6361.0 May 20, 2008 ISL3330, ISL3331 slew limited edges permit longer unterminated networks, or longer stubs off terminated busses, and help minimize EMI and reflections. Nevertheless, for the best jitter performance when driving long cables, the faster speed options may be preferable, even at lower data rates. The faster output transitions deliver less variability (jitter) when loaded with the large capacitance associated with long cables. Of course, faster transitions require more attention to ensuring short stub lengths and quality terminations, so there are trade-offs to be made. Assuming a jitter budget of 10%, it is preferable to go with the slow speed option for data rates of 115kbps or less to minimize fast edge effects. Likewise, the medium speed option is a good choice for data rates between 115kbps and 460kbps. For higher data rates, or when the absolute best jitter is required, use the high speed option. 1k OR NC RXEN * RA Tx/Rx RXEN DEN DY D Z GND ACTIVE HIGH RX ENABLE ISL3331 +3.3V + RXEN RA RXEN * Tx/Rx DEN DY D Z GND * QFN ONLY ACTIVE LOW RX ENABLE Y R VCC B A 0.1F R ISL3331 +3.3V + VCC B A 0.1F Evaluation Board An evaluation board, part number ISL3331EVAL1Z, is available to assist in assessing the dual protocol IC's performance. The evaluation board contains a QFN packaged device, but because the same die is used in all packages, the board is also useful for evaluating the functionality of the other versions. The board's design allows for evaluation of all standard features, plus the QFN specific features. Refer to the evaluation board application note for details, and contact your sales representative for ordering information. Y FIGURE 12. USING ACTIVE LOW vs ACTIVE HIGH RX ENABLE 18 FN6361.0 May 20, 2008 ISL3330, ISL3331 Typical Performance Curves 30 RECEIVER OUTPUT CURRENT (mA) VOL, +25C HIGH OUTPUT VOLTAGE (V) 25 20 15 10 5 0 VOH, +25C VOL, +85C VOH, +85C VCC = VL = 3.3V, TA = +25C; Unless Otherwise Specified 3.5 3.0 2.5 2.0 IOH = -0.5mA 1.5 IOH = -1mA IOH = -6mA 1.0 0.5 IOH = -2mA 0 0.0 1.0 2.0 RECEIVER OUTPUT VOLTAGE (V) 3.0 3.3 1.0 1.5 2.0 VL (V) 2.5 3.0 3.3 FIGURE 13. RECEIVER OUTPUT CURRENT vs RECEIVER OUTPUT VOLTAGE FIGURE 14. RECEIVER HIGH OUTPUT VOLTAGE vs LOGIC SUPPLY VOLTAGE (VL) (QFN ONLY) DRIVER OUTPUT CURRENT (mA) 80 70 60 50 40 30 20 10 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 DIFFERENTIAL OUTPUT VOLTAGE (V) DIFFERENTIAL OUTPUT VOLTAGE (V) 90 2.30 2.25 2.20 2.15 2.10 2.05 2.00 1.95 1.90 -40 -25 0 50 25 TEMPERATURE (C) 75 85 RDIFF = 54 RDIFF = 100 FIGURE 15. RS-485, DRIVER OUTPUT CURRENT vs DIFFERENTIAL OUTPUT VOLTAGE FIGURE 16. RS-485, DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs TEMPERATURE 250 +85C 200 OUTPUT CURRENT (mA) 150 100 ICC (mA) -40C +25C 4.5 RS-232, RXEN, RXEN, ON = X, DEN = VCC 4.0 3.5 3.0 2.5 2.0 1.5 RS-485, HALF DUPLEX, DEN = VCC, RXEN, RXEN, ON = X RS-485, FULL DUPLEX, DEN = VCC, RXEN, RXEN, ON = X RS-485, DEN = GND, RXEN, RXEN = X, ON = VCC RS-232, RXEN, RXEN = X, ON = VCC, DEN = GND 50 Y OR Z = LOW 0 Y OR Z = HIGH -50 +85C -40C -7 -6 -4 -2 0 2 4 6 OUTPUT VOLTAGE (V) 8 10 12 +25C -100 -150 1.0 -40 -25 0 25 50 75 85 TEMPERATURE (C) FIGURE 17. RS-485, DRIVER OUTPUT CURRENT vs SHORT CIRCUIT VOLTAGE FIGURE 18. SUPPLY CURRENT vs TEMPERATURE 19 FN6361.0 May 20, 2008 ISL3330, ISL3331 Typical Performance Curves 50 45 40 35 30 IL(A) RS-485, SLEW, SPB, RXEN = GND 25 20 15 10 5 0 1.0 1.5 2.0 RS-232, SPB, RXEN = VL OR RS-485, SLEW, SPB, RXEN = VL 2.5 VL (V) 3.0 3.5 4.0 RS-232, RXEN = GND, SPB = VL ICC AND IL (A) NO LOAD VIN = VL or GND DEN, RXEN, ON = GND VCC = VL = 3.3V, TA = +25C; Unless Otherwise Specified (Continued) 30 DEN, RXEN, DY, DZ/SLEW, ON = GND NO LOAD VIN = VL OR GND RXEN = VL 20 SPB = GND RS-485 IL VL VCC VL > VCC 25 15 RS-232/RS-485 ICC 10 SPB = VL RS-485 IL 5 SPB = VL RS-232 IL 2.5 VL (V) 3.0 3.5 4.0 0 1.0 1.5 2.0 FIGURE 19. RS-232, VL SUPPLY CURRENT vs VL VOLTAGE (QFN ONLY) 1640 1630 FIGURE 20. VCC and VL SHDN SUPPLY CURRENTS vs VL VOLTAGE (QFN ONLY) RDIFF = 54, CL = 100pF 300 RDIFF = 54, CL = 100pF |tPLHZ - tPHLY| 250 PROPAGATION DELAY (ns) 1620 1610 1600 1590 1580 1570 1560 1550 -40 -25 0 25 TEMPERATURE (C) 50 75 85 0 -40 -25 0 tDHL tDLH SKEW (ns) tDHL 200 |tPHLZ - tPLHY| 150 100 50 |tDLH - tDHL| 25 TEMPERATURE (C) 50 75 85 FIGURE 21. RS-485, DRIVER PROPAGATION DELAY vs TEMPERATURE (SLOW DATA RATE, QFN ONLY) 550 545 PROPAGATION DELAY (ns) 540 535 530 525 520 515 -40 FIGURE 22. RS-485, DRIVER SKEW vs TEMPERATURE (SLOW DATA RATE, QFN ONLY) RDIFF = 54, CL = 100pF 16 14 12 SKEW (ns) 10 8 6 4 RDIFF = 54, CL = 100pF |tPLHZ - tPHLY| tDHL tDLH tDHL |tPHLZ - tPLHY| |tDLH - tDHL| 2 -25 0 25 50 75 85 0 -40 -25 0 25 50 75 85 TEMPERATURE (C) TEMPERATURE (C) FIGURE 23. RS-485, DRIVER PROPAGATION DELAY vs TEMPERATURE (MEDIUM DATA RATE) FIGURE 24. RS-485, DRIVER SKEW vs TEMPERATURE (MEDIUM DATA RATE) 20 FN6361.0 May 20, 2008 ISL3330, ISL3331 Typical Performance Curves 24 23 PROPAGATION DELAY (ns) 2.5 |tDLH - tDHL| RDIFF = 54, CL = 100pF VCC = VL = 3.3V, TA = +25C; Unless Otherwise Specified (Continued) 3.0 RDIFF = 54, CL = 100pF 22 21 20 19 tDHL tDLH 2.0 SKEW (ns) 1.5 |tPHLZ - tPLHY| 18 17 1.0 0.5 16 15 -40 -25 0 25 50 75 85 0 -40 -25 |tPLHZ - tPHLY| 0 25 50 75 85 TEMPERATURE (C) TEMPERATURE (C) FIGURE 25. RS-485, DRIVER PROPAGATION DELAY vs TEMPERATURE (FAST DATA RATE) FIGURE 26. RS-485, DRIVER SKEW vs TEMPERATURE (FAST DATA RATE) DRIVER INPUT (V) RECEIVER OUTPUT (V) RECEIVER OUTPUT (V) RDIFF = 54, CL = 100pF DY 5 0 RDIFF = 54, CL = 100pF DY 5 0 5 0 5 0 RA RA DRIVER OUTPUT (V) DRIVER OUTPUT (V) 4 Y 3 2 1 0 TIME (400ns/DIV) Z 4 Z 3 2 Y 1 0 TIME (400ns/DIV) FIGURE 27. RS-485, DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH (SLOW DATA RATE, QFN ONLY) FIGURE 28. RS-485, DRIVER AND RECEIVER WAVEFORMS, HIGH TO LOW (SLOW DATA RATE, QFN ONLY) DRIVER INPUT (V) RECEIVER OUTPUT (V) RDIFF = 54, CL = 100pF DY 5 0 RECEIVER OUTPUT (V) 5 0 RDIFF = 54, CL = 100pF DY 5 0 5 0 RA RA DRIVER OUTPUT (V) 4 Y 3 2 1 0 TIME (200ns/DIV) Z DRIVER OUTPUT (V) 4 Z 3 2 Y 1 0 TIME (200ns/DIV) FIGURE 29. RS-485, DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH (MEDIUM DATA RATE) FIGURE 30. RS-485, DRIVER AND RECEIVER WAVEFORMS, HIGH TO LOW (MEDIUM DATA RATE) 21 FN6361.0 May 20, 2008 DRIVER INPUT (V) DRIVER INPUT (V) ISL3330, ISL3331 Typical Performance Curves RECEIVER OUTPUT (V) VCC = VL = 3.3V, TA = +25C; Unless Otherwise Specified (Continued) DRIVER INPUT (V) RECEIVER OUTPUT (V) RDIFF = 54, CL = 100pF DY 5 0 DRIVER INPUT (V) 85 RDIFF = 54, CL = 100pF DY 5 0 5 0 5 0 RA RA DRIVER OUTPUT (V) DRIVER OUTPUT (V) 4 Y 3 2 1 0 TIME (10ns/DIV) Z 4 3 2 1 0 Z Y TIME (10ns/DIV) FIGURE 31. RS-485, DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH (FAST DATA RATE) FIGURE 32. RS-485, DRIVER AND RECEIVER WAVEFORMS, HIGH TO LOW (FAST DATA RATE) 7.5 250kbps 5.0 2.5 ALL TOUTS LOADED WITH 3k TO GND 0 -2.5 -5.0 VOUT -7.5 0 1000 2000 3000 250kbps 4000 5000 1 TRANSMITTER AT 250kbps or 400kbps, OTHER TRANSMITTER AT 30kbps 400kbps VOUT+ RS-232 REGION OF NONCOMPLIANCE TRANSMITTER OUTPUT VOLTAGE (V) TRANSMITTER OUTPUT VOLTAGE (V) 7.5 5.0 VOUT+ 2.5 OUTPUTS STATIC ALL TOUTS LOADED WITH 3k TO GND AND AT V+ OR V- 400kbps 0 -2.5 -5.0 VOUT -7.5 -40 -25 0 50 25 TEMPERATURE (C) 75 LOAD CAPACITANCE (pF) FIGURE 33. RS-232, TRANSMITTER OUTPUT VOLTAGE vs LOAD CAPACITANCE 50 TRANSMITTER OUTPUT CURRENT (mA) 40 30 20 VOUT SHORTED TO GND 10 0 -10 Y OR Z = HIGH -20 -30 -40 -25 0 25 50 75 85 FIGURE 34. RS-232, TRANSMITTER OUTPUT VOLTAGE vs TEMPERATURE CL = 4000pF, 1 CHANNEL SWITCHING Y OR Z = LOW 5 DY 0 5 0 Y/A -5 5 RA 0 2s/DIV TEMPERATURE (C) FIGURE 35. RS-232, TRANSMITTER SHORT CIRCUIT CURRENT vs TEMPERATURE FIGURE 36. RS-232, TRANSMITTER AND RECEIVER WAVEFORMS AT 250kbps 22 FN6361.0 May 20, 2008 ISL3330, ISL3331 Typical Performance Curves CL = 1000pF, 1 CHANNEL SWITCHING DY 0 5 0 Y/A -5 5 RA 0 RECEIVER + DUTY CYCLE (%) 5 VCC = VL = 3.3V, TA = +25C; Unless Otherwise Specified (Continued) 58 VIN = 5 57 56 55 SR IN = 15V/s 54 53 52 51 SR IN = 100V/s 50 49 0 500 1000 DATA RATE (kbps) 1500 2000 FULL TEMP RANGE 2s/DIV FIGURE 37. RS-232, TRANSMITTER AND RECEIVER WAVEFORMS AT 400kbps FIGURE 38. RS-232, RECEIVER OUTPUT + DUTY CYCLE vs DATA RATE 550 500 450 DATA RATE (kbps) 400 350 300 250 200 TRANSMITTER OUTPUT VOLTAGE (V) ALL TOUTS LOADED WITH 5k TO GND 2 TRANSMITTERS AT +25C 1 TRANSMITTER AT +25C 5.0 2.5 VOUT+ +25C +85C 1 TRANSMITTER SWITCHING 0 ALL TOUTS LOADED WITH 5k TO GND, CL = 1000pF -2.5 +85C VOUT -7.5 0 100 200 300 400 DATA RATE (kbps) 500 +25C 600 1 TRANSMITTER AT +85C 2 TRANSMITTERS AT +85C -5.0 150 100 0 1000 2000 3000 4000 LOAD CAPACITANCE (pF) 5000 FIGURE 39. RS-232, TRANSMITTER MAXIMUM DATA RATE vs LOAD CAPACITANCE FIGURE 40. RS-232, TRANSMITTER OUTPUT VOLTAGE vs DATA RATE Die Characteristics 650 2 TRANSMITTERS SWITCHING 600 ALL TOUTS LOADED WITH 3k TO GND, CL = 1000pF 550 SKEW (ns) 500 450 400 +25C 350 300 250 0 50 200 400 DATA RATE (kbps) -40C +85C SUBSTRATE AND QFN PAD POTENTIAL (POWERED UP): GND TRANSISTOR COUNT: 2490 PROCESS: BiCMOS 600 650 FIGURE 41. RS-232, TRANSMITTER SKEW vs DATA RATE 23 FN6361.0 May 20, 2008 RS-232 REGION OF NONCOMPLIANCE VOUT 4V AND DUTY CYCLE BETWEEN 40% AND 60% 7.5 ISL3330, ISL3331 Package Outline Drawing L40.6x6 40 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE Rev 3, 10/06 4X 4.5 6.00 A B 6 PIN 1 INDEX AREA 31 30 36X 0.50 40 1 6 PIN #1 INDEX AREA 4 . 10 0 . 15 6.00 21 (4X) 0.15 20 TOP VIEW 40X 0 . 4 0 . 1 BOTTOM VIEW 11 10 0.10 M C A B 4 0 . 23 +0 . 07 / -0 . 05 SEE DETAIL "X" 0.10 C BASE PLANE SIDE VIEW ( 36X 0 . 5 ) SEATING PLANE 0.08 C C 0 . 90 0 . 1 ( 5 . 8 TYP ) ( 4 . 10 ) C ( 40X 0 . 23 ) ( 40X 0 . 6 ) TYPICAL RECOMMENDED LAND PATTERN 0 . 2 REF 5 0 . 00 MIN. 0 . 05 MAX. DETAIL "X" NOTES: 1. Dimensions are in millimeters. Dimensions in ( ) for Reference Only. 2. Dimensioning and tolerancing conform to AMSE Y14.5m-1994. 3. Unless otherwise specified, tolerance : Decimal 0.05 4. Dimension b applies to the metallized terminal and is measured between 0.15mm and 0.30mm from the terminal tip. 5. Tiebar shown (if present) is a non-functional feature. 6. The configuration of the pin #1 identifier is optional, but must be located within the zone indicated. The pin #1 indentifier may be either a mold or mark feature. 24 FN6361.0 May 20, 2008 ISL3330, ISL3331 Shrink Small Outline Plastic Packages (SSOP) N INDEX AREA E -B1 2 3 0.25 0.010 L GAUGE PLANE H 0.25(0.010) M BM M20.209 (JEDEC MO-150-AE ISSUE B) 20 LEAD SHRINK SMALL OUTLINE PLASTIC PACKAGE INCHES SYMBOL A A1 SEATING PLANE MILLIMETERS MIN 1.73 0.05 1.68 0.25 0.09 7.07 5.20' 7.65 0.63 20 MAX 1.99 0.21 1.78 0.38 0.20' 7.33 5.38 7.90' 0.95 6 7 8 deg. Rev. 3 11/02 3 4 9 NOTES MIN 0.068 0.002 0.066 0.010' 0.004 0.278 0.205 0.301 0.025 20 0 deg. MAX 0.078 0.008' 0.070' 0.015 0.008 0.289 0.212 0.311 0.037 A2 B C D -A- D -C- A A1 0.10(0.004) A2 C E e H L N e B 0.25(0.010) M C AM BS 0.026 BSC 0.65 BSC NOTES: 1. Symbols are defined in the "MO Series Symbol List" in Section 2.2 of Publication Number 95. 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Dimension "D" does not include mold flash, protrusions or gate burrs. Mold flash, protrusion and gate burrs shall not exceed 0.20mm (0.0078 inch) per side. 4. Dimension "E" does not include interlead flash or protrusions. Interlead flash and protrusions shall not exceed 0.20mm (0.0078 inch) per side. 5. The chamfer on the body is optional. If it is not present, a visual index feature must be located within the crosshatched area. 6. "L" is the length of terminal for soldering to a substrate. 7. "N" is the number of terminal positions. 8. Terminal numbers are shown for reference only. 9. Dimension "B" does not include dambar protrusion. Allowable dambar protrusion shall be 0.13mm (0.005 inch) total in excess of "B" dimension at maximum material condition. 10. Controlling dimension: MILLIMETER. Converted inch dimensions are not necessarily exact. 8 deg. 0 deg. All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 25 FN6361.0 May 20, 2008 |
Price & Availability of ISL3330
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