 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| SP233A,SP310A and SP312A Enhanced RS-232 Line Drivers/Receivers FEATURES * Operates from a Single +5V Power Supply * Meets all RS-232F and ITU V.28 Specifications * Operates with 0.F Ceramic Capacitors * No External Capacitors required (SP233A) * Low Power Shutdown (SP30A, SP32A) * High Data Rate - 20kbps under load * Low power CMOS Operation * +/-2kV Human Body Model ESD Protection * Lead Free packaging available DESCRIPTION The SP233A / SP30A / SP32A devices are a family of line driver and receiver pairs that meets the specifications of RS-232 and V.28 serial protocols. The devices are pin-to-pin compatible with popular industry standard pinouts. The SP233A / SP30A / SP32A offer 20kbps data rate under load, small ceramic type 0.F charge pump capacitors and overall ruggedness for comercial applications. Features include Exar's BiCMOS design allowing for low power operation without sacrificing performance. These devices are available in plastic DIP and SOIC Wide packages operating over the commercial and industrial temperature ranges. SELECTION TABLE Model Number of RS-232 Drivers Receivers No. of RX active in Shutdown No. of External 0.F Capacitors Shutdown WakeUp TTL Tri-State SP233A SP30A SP32A 2 2 2 2 2 2 N/A 0 2 0 4 4 No Yes Yes No No Yes No Yes Yes Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-7000 * Fax (50)668-707 * www.exar.com SP233A,30A,32A 00_05308 These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below are not implied. Exposure to absolute maximum ratings conditions for extended periods of time may affect reliability. Supply Voltage (VCC)....................................................+ 6V V+........................................................................... (Vcc-0.3V) to +.0V V- .............................................................................-.0V Input Voltages Tin.....................................................-0.3V to (Vcc + 0.3V) Rin............................................................................+/-30V Output Voltages Tout...............................................(V+, +0.3V) to (V-, -0.3V Rout...................................................-0.3V to (Vcc + 0.3V) AbSoLUTE MAxiMUM RATingS Short Circuit duration Tout.....................................................Continuous Package Power Dissipation: Plastic DIP...............................................375mW (derate 7mW/C above +70C) Small Outline...........................................375mW (derate 7mW/C above +70C) Storage Temperature..................-65C to +50C Lead Temperature (soldering, 0s).......... +300C ELECTRiCAL CHARACTERiSTiCS Vcc=5V 0%, 0.F charge pump capacitors, Tmin to Tmax, unless otherwise noted, Typical values are Vcc=5V and Ta=25C PARAMETER TTL inPUT Logic Threshold LOW Logic Threshold HIGH Logic Pull-Up Current TTL oUTPUT Output Voltge LOW Output Voltage HIGH Leakage Current; Ta=25C RS-232 oUTPUT Output Voltage Swing Output Resistance Output Short Circuit Current Maximum Data Rate RS-232 inPUT Voltage Range Voltage Threshold LOW Voltage Threshold HIGH Hysteresis Resistance Vcc = 5V, Ta=25C Vcc = 5V, Ta=25C Vcc = 5V, Ta=25C 0.2 3 -25 0.8 .2 .7 0.5 5 2.4 .0 7 +25 Volts Volts Volts Volts k all Transmitter outputs loaded with 3k ohms to GND Vcc = 0V, Vout = +/-2V Infinite Duration CL = 2500pF, RL = 3k 20 +/-5.0 300 +/-8 240 +/-9V Volts Ohms mA kbps iOuT = 3.2ma: Vcc = +5V iOuT = -1.0ma En = Vcc, 0V VOuT Vcc SP30A and SP32A only 3.5 0.05 +/-0 0.4 Volts Volts A Tin, En, SD, On/OFF Tin, En, SD, On/OFF Tin = 0V 2.0 5 200 0.8 Volts Volts A TEST ConDiTionS Min TYP MAx UniT Ta=25C, -25V Vin +25V Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-7000 * Fax (50)668-707 * www.exar.com SP233A,30A,32A_00_05308 2 ELECTRiCAL CHARACTERiSTiCS Vcc=5V 0%, 0.F charge pump capacitors, Tmin to Tmax, unless otherwise noted, Typical values are Vcc=5V and Ta=25C Parameter DYnAMiC CHARACTERiSTiCS Driver Propagation Delay Receiver Propagation Delay Instantaneous Slew Rate TTL to RS_232; CL = 50pF RS-232 to TTL, CL = 10pF, RL = 3-7k CL = 2500pF, RL = 3k; Measured from +3V to -3V or -3V to +3V SP30A and SP32A only SP30A and SP32A only .5 0. 3.0 .0 30 s s V/ s V/ s TEST CONDITIONS MIN TYP MAX Unit Transition Region Slew Rate 0 Output Enable Time Output Disable Time PoWER REQUiREMEnTS Vcc Power Supply Current Vcc Power Supply Current, Loaded Shutdown Supply Current SP30A and SP32A only 400 250 ns ns No Load, Vcc = 5V, Ta=25C All Transmitters RL = 3k, Ta=25C Vcc = 5V, Ta=25C 0 25 5 mA mA 0 A Pin ASSignMEnTS 20 pin PDIP 20 pin WSOIC 8 pin PDIP / WSOIC 3 8 pin WSOIC Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-7000 * Fax (50)668-707 * www.exar.com SP233A,30A,32A 00_05308 DESCRiPTion DETAiLED DESCRiPTion The SP233A, SP30A and SP32A devices are a family of line driver and receiver pairs that meet the EIA/TIA-232 and V.28 serial communication protocols. These devices are pin-to-pin compatible with popular industry standards. The SP233A, SP30A and SP32A devices offer a 20kbps data rate, 0V/s slew rate and an onboard charge pump that operates from a single 5V supply using 0.F ceramic capacitors. The ESD tolerance has been improved on these devices to +/-2kV Human Body Model. The SP233A device provides internal charge pump capacitors. The SP30A provides an ON/ OFF input that simultaneously disables the internal charge pump circuit and puts all transmitter and receiver outputs into a high impedance state. The SP32A is identical to the SP30 but with seperate tri-state and shutdown inputs Theory of operation The SP233A, SP30A and SP32A devices are made up of three basic circuit blocks: . Drivers, 2. Receivers, and 3. charge pump. Drivers The drivers are inverting level transmitters that convert TTL or CMOS logic levels to EIA/TIA232 levels with an inverted sense relative to the input logic levels. Typically, the driver output voltage swing is +/-9V. Even under worst case loading conditions of 3kOhms and 2500pF, the driver output is guaranteed to be +/-5.0V minimum, thus satisfying the RS-232 specification. The driver outputs are protected against infinite short-circuits to ground without degradation in reliability. The drivers can guarantee output data rates of 20kbps under worst case loading of 3k ohms and 2500pF. The Slew rate of the driver output is internally limited to 30V/ s in order to meet the EIA standards (EIA-232F). Additionally, the driver outputs LOW to HIGH transition meets the montonic output requirements of the standard. Receivers The receivers convert EIA/TIA-232 signal levels to TTL or CMOS logic output levels. Since the input is usually from a transmission line, where long cable length and system interference can degrade the signal, the inputs have a typical hysteresis margin of 500mV. This ensures that the receiver is virtually immune to noisy transmission lines. Should an input be left unconnected, an internal 5kohm pull-down resistor to ground will commit the output of the receiver to a HIGH state. Charge pump The charge pump is a patented design and uses a unique approach compared to older less efficiant designs. The charge pump requires 4 external capacitors and uses a four phase voltage shifting technique. The internal power supply consists of a dual charge pump that provides a driver output voltage swing of +/-9V. The internal oscillator controls the four phases of the voltage shifting. A description of each phase follows: Phase 1 Vss charge store and double: The positive terminals of capacitors C and C2 are charged from Vcc with their negative terminals initially connected to ground. C+ is then connected to ground and the stored charge from C- is superimposed onto C2-. Since C2+ is still connected to Vcc the voltage potential across C2 is now 2 x Vcc. Phase 2 Vss transfer and invert: Phase two connects the negative terminal of C2 to the Vss storage capacitor and the positive terminal of C2 to ground. This transfers the doubled and inverted (V-) voltage onto C4. Meanwhile, capacitor C is charged from Vcc to prepare it for its next phase. Phase 3 Vdd charge store and double: Phase three is identical to the first phase. The positive terminals of C and C2 are charged from Vcc with their negative terminals initially connected to ground. C+ is then connected to ground and the stored charge from C- is superimposed onto C2-. Since C2+ is still connected to Vcc the voltage potential across capacitor C2 is now 2 x Vcc. Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-7000 * Fax (50)668-707 * www.exar.com SP233A,30A,32A_00_05308 4 DESCRiPTion Phase 4 Vdd transfer: The fourth phase connects the negative terminal of C2 to ground and the positive terminal of C2 to the Vdd storage capacitor. This transfers the doubled (V+) voltage onto C3. Meanwhile, capacitor C is charged from Vcc to prepare it for its next phase. The clock rate for the charge pump typically operates at greater than 5kHz allowing the pump to run efficiently with small 0.1uF capacitors. Efficient operation depends on rapid charging and discharging of C and C2, therefore capacitors should be mounted as close as possible to the IC and have low ESR (equivalent series resistance). Inexpensive surface mount, ceramic capacitors are ideal for using on charge pump. If polarized capacitors are used the positive and negative terminals should be connected as shown in the typical operating circuit. A diagram of the individual phases are shown in Figure . Shutdown (SD) and Enable (En) features for the SP310A and SP312A Both the SP30A and SP32A have a shutdown / standby mode to conserve power in batterypowered applications. To activate the shutdown mode, which stops the operation of the charge pump, a logic "0" is applied to the appropriate control line. For the SP30A, this control line is the ON/OFF (pin 8) input. Activating the shutdown mode puts the SP30A transmitter and receiver ouptuts into a high impedance condition. For the SP32A, this control line is the SHUTDOWN (pin8) input; this also puts the transmitter outputs in a tri-state mode. The receiver outputs can be tri-stated seperately during normal operation or shutdown by applying a logic "" on the EN line (pin ). Wake-Up Feature for the SP312A The SP32A has a wake-up feature that keeps the receivers active when the device is placed into shutdown. Table 1 defines the truth table for the Wake-Up function. When only the receivers are activated, the SP32A typically draws less than 5uA supply current. In the case of when a modem is interfaced to a computer in power down mode, the Ring Indicator (RI) signal from the modem would be used to "wake-up" the computer, allowing it to accept data transmission. After the ring indicator has propagated through the SP32A receiver, it can be used to trigger the power management circuitry of the computer to power up the microprocessor, and bring the SD pin of the SP32A to a logic high, taking it out of the shutdown mode. The receiver propagation delay is typically us. The enable time for V+ and V- is typically 2ms. After V+ and V- have settled to their final values, a signal can be sent back to the modem on the data terminal ready (DTR) pin signifying that the computer is ready to accept the transmit data. SD 0 0 EN 0 0 Power Receiver Up/Down outputs Down Down Up Up Enabled Tri-state Enabled Tri-state Table . Wake-up Function truth table Pin Strapping for the SP233ACT/ACP The SP233A packaged in a 20 pin SOICW package (SP233ACT) has a slightly different pinout than the SP233A in PDIP packaging (SP233ACP). To operate properly, the following pairs of pins must be externally wired together as noted in table 2: Pins Wired Together Two V- pins Two C- pins SOICW 0 & 7 & 6 PDIP 2 & 7 & 5 0 & 6 Two C2+ pins 2 & 5 No Connections for Pins 8, 3 and 4 Connect Pins 6 and 9 to GND Table 2. Pin Strapping table for SP233A Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-7000 * Fax (50)668-707 * www.exar.com SP233A,30A,32A 00_05308 5 + V CC - Phase 2 - Vss transfer from C2 to C4. Meanwhile C1 is charged to Vcc + + V CC - C Phases 1 and 3: Store/Double. Double charge from C1 onto C2. C2 is now charged to -2xVcc + 1 C + 2 V+ ee- C + 3 e- C Vss 4 + C + 1 C + 2 V+ V- C + 3 Patented 5,306,954 + V CC - ee- C 4 Phase 4 VDD transfer from C2 to C3. Meanwhile C1 is charged to Vcc V e+ DD e+ + C + 1 C + 2 V+ V- C + 3 e- C 4 Figure . Charge pump phases Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-7000 * Fax (50)668-707 * www.exar.com SP233A,30A,32A_00_05308 6 TYPiCAL PERFoRMAnCE CHARACTERiSTiCS Figure 2, SP233A Charge pump waveformsno load ( = C+, 2 = C2+, 3 = V+, 4 = V-). Figure 5, Charge pump outputs at start up ( = Vcc, 2 = V+, 3 = V-). Figure 3, SP233A Charge pump waveforms when fully loaded with 3Kohms ( = C+, 2 = C2+, 3 = V+, 4 = V-). Figure 4, Loopback results at 60KHZ and 2500pF load ( = TXin, 2 = TXout/RXin, 3 = RXout). Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-7000 * Fax (50)668-707 * www.exar.com SP233A,30A,32A 00_05308 7 Figure 6, SP233ACP Typical Application circuit Figure 8, SP233ACT Typical Application circuit Figure 7, SP30A Typical Application circuit 8 Figure 9, SP32A Typical Application circuit Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-7000 * Fax (50)668-707 * www.exar.com SP233A,30A,32A_00_05308 Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-7000 * Fax (50)668-707 * www.exar.com SP233A,30A,32A 00_05308 9 Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-7000 * Fax (50)668-707 * www.exar.com SP233A,30A,32A_00_05308 0 Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-7000 * Fax (50)668-707 * www.exar.com SP233A,30A,32A 00_05308 Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-7000 * Fax (50)668-707 * www.exar.com SP233A,30A,32A_00_05308 2 ORDERING INFORMATION Part number LEAD FREE Tape & Reel SP233ACP SP233AEP SP233ACT SP233AET SP30ACP SP30ACT SP30AET SP32ACT SP32AET -L -L -L -L -L -L -L -L -L /TR /TR /TR /TR /TR /TR Temperature range From 0 to +700C From -40 to +85 C From 0 to +700C From -40 to +850C From 0 to +70 C From 0 to +70 C From -40 to +85 C From 0 to +700C From -40 to +85 C 0 0 0 0 0 Package Type 20 pin PDIP 20 pin PDIP 20 pin SOICW 20 pin SOICW 8 pin PDIP 8 pin SOICW 8 pin SOICW 8 pin SOICW 8 pin SOICW All packages are available as lead free (RoHS compliant). To order add "-L" suffix to part number. For Tape and Reel add "/TR". Reel quantity is ,500 for SOICW. Example: SP233ACT-L/TR = lead free and Tape and Reel. SP233ACT/TR = standard with Tape and Reel. Notice EXAR Corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no representation that the circuits are free of patent infringement. Charts and schedules contained herein are only for illustration purposes and may vary depending upon a user's specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writting, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized ; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. Copyright 2008 EXAR Corporation Datasheet May 2008 Send your Interface technical inquiry with technical details to: customersupport@exar.com Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (50)668-7000 * Fax (50)668-707 * www.exar.com SP233A,30A,32A 00_05308 3 |
Price & Availability of SP310AET
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |