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(R)
ISL81485
Data Sheet July 2004 FN6061.1
5V, 30Mbps, RS-485/RS-422 Transceiver
The Intersil ISL81485 is a BiCMOS, 5V powered, single transceiver that meets both the RS-485 and RS-422 standards for balanced communication, and features a larger output voltage and higher data rate to benefit high speed applications. Unlike competitive devices, this Intersil transceiver is specified for 10% tolerance supplies (4.5V to 5.5V), and it delivers a much larger worst case differential output voltage (2.0V compared to the typical 1.5V) over the full supply range. The increased output voltage translates into longer reach, or better data integrity, at the 30Mbps data rate. This device presents a "1 unit load" to the RS-485 bus, which allows up to 32 transceivers on the network. Receiver (Rx) inputs feature a "fail-safe if open" design, which ensures a logic high Rx output if Rx inputs are floating. Driver (Tx) outputs are short circuit protected, even for voltages exceeding the power supply voltage. Additionally, on-chip thermal shutdown circuitry disables the Tx outputs to prevent damage if power dissipation becomes excessive.
Features
* Specified for 10% Tolerance Supplies * High Data Rates. . . . . . . . . . . . . . . . . . . . . up to 30Mbps * Large Differential Output Voltage . . . . 2.0V(min.) into 54 * Drop-In Replacement for the ADM1485 * One Unit Load Allows up to 32 Devices on the Bus * Low Quiescent Current . . . . . . . . . . . . . . . . . . . . . 800A * -7V to +12V Common Mode Input Voltage Range * Three State Rx and Tx Outputs * 15ns (Max) Propagation Delays, 5ns (Max) Skew * Operates from a Single +5V Supply (10% Tolerance) * Current Limiting and Thermal Shutdown for driver Overload Protection * Pb-free available
Applications
* SCSI "Fast 20" Drivers and Receivers * Factory Automation * Field Bus Networks
Ordering Information
PART NO. (BRAND) ISL81485IB (81485IB) ISL81485IBZ (81485IB) (See Note) ISL81485IU (1485) ISL81485IUZ (1485) (See Note) TEMP. RANGE (oC) -40 to 85 -40 to 85 -40 to 85 -40 to 85 PACKAGE 8 Ld SOIC 8 Ld SOIC (Pb-free) 8 Ld MSOP 8 Ld MSOP (Pb-free) PKG. DWG. # M8.15 M8.15 M8.118 M8.118
* Security Networks * Building Environmental Control Systems * Industrial/Process Control Networks
Pinout
ISL81485 (SOIC, MSOP) TOP VIEW
RO 1 RE 2 DE 3 DI 4 D 8 7 6 5 VCC B/Z A/Y GND
*Add "-T" suffix to part number for tape and reel packaging. NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which is 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-020B.
R
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright (c) Intersil Americas Inc. 2003, 2004. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
ISL81485 Truth Table
TRANSMITTING INPUTS RE X X X DE 1 1 0 DI 1 0 X OUTPUTS B/Z 0 1 High-Z A/Y 1 0 High-Z RE 0 0 0 1 INPUTS DE 0 0 0 X A-B +0.2V -0.2V Inputs Open X
Truth Table
RECEIVING OUTPUT RO 1 0 1 High-Z
Pin Descriptions
PIN RO RE DE DI GND A/Y B/Z VCC FUNCTION Receiver output: If A > B by at least 0.2V, RO is high; If A < B by 0.2V or more, RO is low; RO = High if A and B are unconnected (floating). Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is high. Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high. They are high impedance when DE is low. Driver input. A low on DI forces output Y low and output Z high. Similarly, a high on DI forces output Y high and output Z low. Ground connection. RS-485/422 level, noninverting receiver input and noninverting driver output. Pin is an input (A) if DE = 0; pin is an output (Y) if DE = 1. RS-485/422 level, inverting receiver input and inverting driver output. Pin is an input (B) if DE = 0; pin is an output (Z) if DE = 1. System power supply input (4.5V to 5.5V).
Typical Operating Circuit
ISL81485
+5v + 8 VCC 1 RO 2 RE 3 DE 4 DI R B/Z 7 A/Y 6 RT RT 7 B/Z 6 A/Y 0.1F 0.1F + 8 VCC D DI 4 DE 3 RE 2 R GND 5 GND 5 RO 1 +5v
D
2
ISL81485
Absolute Maximum Ratings
VCC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V Input Voltages DI, DE, RE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V Input / Output Voltages A/Y, B/Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -8V to +12.5V RO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (VCC +0.5V) Short Circuit Duration Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
Thermal Information
Thermal Resistance (Typical, Note 1)
JA (oC/W)
8 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . 105 8 Ld MSOP Package . . . . . . . . . . . . . . . . . . . . . . . . 140 Maximum Junction Temperature (Plastic Package) . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC (Lead Tips Only)
Operating Conditions
Temperature Range ISL81485IX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE: 1. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Electrical Specifications
Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at VCC = 5V, TA = 25oC, Note 2 SYMBOL TEST CONDITIONS TEMP (oC) MIN TYP MAX UNITS
PARAMETER DC CHARACTERISTICS Driver Differential VOUT (no load) Driver Differential VOUT (with load)
VOD1 VOD2 R = 50 (RS-422) (Figure 1A) R = 27 (RS-485) (Figure 1A) RD = 60, -7V VCM 12V (Figure 1B)
Full Full Full Full Full
2.5 2 1.5 -
3 2.5 0.01
VCC 5 0.2
V V V V V
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 Logic Input High Voltage Logic Input Low Voltage Logic Input Current Input Current (A/Y, B/Z) (Note 5)
VOD
R = 27 or 50 (Figure 1A)
VOC VOC
R = 27 or 50 (Figure 1A) R = 27 or 50 (Figure 1A)
Full Full
-
0.01
3 0.2
V V
VIH VIL IIN1 IIN2
DE, DI, RE DE, DI, RE DE, DI, RE DE = 0V, VCC = 0V or 4.5 to 5.5V -7V VCM 12V VCM = 0V IO = -4mA, VID = 200mV IO = -4mA, VID = 200mV 0.4V VO 2.4V -7V VCM 12V DI, RE = 0V or VCC DE = VCC DE = 0V VIN = 12V VIN = -7V
Full Full Full Full Full Full 25 Full Full Full Full Full Full Full
2 -1 -0.8 -0.2 4 12 60
40 1 0.8 -
0.8 1 1 0.2 0.4 1 2.2 1 250
V V A mA mA V mV V V A k mA mA mA
Receiver Differential Threshold Voltage Receiver Input Hysteresis Receiver Output High Voltage Receiver Output Low Voltage Three-State (high impedance) Receiver Output Current Receiver Input Resistance No-Load Supply Current, Note 3
VTH VTH VOH VOL IOZR RIN ICC
Driver Short-Circuit Current, VO = High or Low
IOSD1
DE = VCC, -7V VY or VZ 12V (Note 4)
3
ISL81485
Electrical Specifications
Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at VCC = 5V, TA = 25oC, Note 2 (Continued) SYMBOL IOSR TEST CONDITIONS 0V VO VCC TEMP (oC) Full MIN 7 TYP MAX 85 UNITS mA
PARAMETER Receiver Short-Circuit Current SWITCHING CHARACTERISTICS Driver Input to Output Prop Delay Driver Prop Delay Skew Driver Differential Rise or Fall Time Driver Enable to Output High Driver Enable to Output Low Matched Enable Switching |tAZH - tBZL| or |tBZH - tAZL| Driver Disable from Output High Driver Disable from Output Low Matched Disable Switching |tAHZ - tBLZ| or |tBHZ - tALZ| Driver Maximum Data Rate Receiver Input to Output Prop Delay Receiver Prop Delay Skew | tPLH - tPHL | Receiver Enable to Output High Receiver Enable to Output Low Receiver Disable from Output High Receiver Disable from Output Low Receiver Maximum Data Rate NOTES:
tPLH, tPHL RDIFF = 54, CL = 100pF (Figure 2) tSKEW tR, tF tZH tZL tEN tHZ tLZ tDIS fMAXD RDIFF = 54, CL = 100pF (Figure 2) RDIFF = 54, CL = 100pF (Figure 2) CL = 50pF, SW = GND (Figure 3) CL = 50pF, SW = VCC (Figure 3) (Figure 3) CL = 50pF, SW = GND (Figure 3) CL = 50pF, SW = VCC (Figure 3) (Figure 3) |VOD| 1.5V (Figure 4)
Full Full Full Full Full Full Full Full Full Full Full Full Full Full Full Full Full
2 30 8 30
9 1 5 9 9 1 9 9 2 17 1 7 7 7 7 -
15 5 15 25 25 3 25 25 5 30 5 20 20 20 20 -
ns ns ns ns ns ns ns ns ns Mbps ns ns ns ns ns ns Mbps
tPLH, tPHL (Figure 5) tSKD tZH tZL tHZ tLZ fMAXR (Figure 5) CL = 15pF, SW = GND (Figure 6) CL = 15pF, SW = VCC (Figure 6) CL = 15pF, SW = GND (Figure 6) CL = 15pF, SW = VCC (Figure 6) CL = 15pF, VID 1.5V, RO tH and tL 20ns
2. 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. 3. Supply current specification is valid for loaded drivers when DE = 0V. 4. Applies to peak current. See "Typical Performance Curves" for more information. 5. Devices meeting these limits are denoted as "1 unit load (UL)" transceivers. The RS-485 standard allows up to 32 Unit Loads on the bus, so a 1UL transceiver permits > 32 devices on the bus.
Test Circuits and Waveforms
R VCC DE DI D Y R VOC Z VOD VCC DE DI D Y Z VOD RD = 60
375 VCM -7V to +12V 375
FIGURE 1A. VOD AND VOC
FIGURE 1B. VOD WITH COMMON MODE LOAD FIGURE 1. DC DRIVER TEST CIRCUITS
4
ISL81485 Test Circuits and Waveforms (Continued)
3V DI 1.5V 1.5V 0V tPLH CL = 100pF Z D Y SIGNAL GENERATOR RDIFF CL = 100pF OUT (Z) 50% 50% VOL tPHL tPLH VOH 50% tPHL VOH VCC DE DI OUT (Y) 50% VOL
DIFF OUT (Y - Z) tR
90% 10%
90% 10% tF
+VOD -VOD
SKEW = |CROSSING PT. OF Y & Z - CROSSING PT. OF Y & Z|
FIGURE 2A. TEST CIRCUIT
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
DE DI D SIGNAL GENERATOR Y CL SW Z 110 VCC GND tZH OUTPUT HIGH tHZ DE 1.5V 1.5V
3V 0V
VOH - 0.5V OUT (Y, Z) 2.3V
VOH 0V
PARAMETER OUTPUT tHZ tLZ tZH tZL Y/Z Y/Z Y/Z Y/Z
RE X X X X
DI 1/0 0/1 1/0 0/1
SW GND VCC GND VCC
CL (pF) 50 50 50 50
OUT (Y, Z) 2.3V OUTPUT LOW tZL tLZ
VCC VOL + 0.5V V OL
FIGURE 3A. TEST CIRCUIT
FIGURE 3B. MEASUREMENT POINTS
FIGURE 3. DRIVER ENABLE AND DISABLE TIMES
VCC
DE DI D Y Z RDIFF
CL = 100pF 3V DI CL = 100pF +VOD -VOD 0V
SIGNAL GENERATOR
DIFF OUT (Y - Z)
0V
FIGURE 4A. TEST CIRCUIT FIGURE 4. DRIVER DATA RATE
FIGURE 4B. MEASUREMENT POINTS
5
ISL81485 Test Circuits and Waveforms (Continued)
RE +1.5V B A R 15pF RO A 1.5V 1.5V 0V tPLH SIGNAL GENERATOR 50% tPHL VCC RO 50% 0V 3V
FIGURE 5A. TEST CIRCUIT
FIGURE 5B. MEASUREMENT POINTS FIGURE 5. RECEIVER PROPAGATION DELAY
RE B R SIGNAL GENERATOR A 15pF RO 1k SW VCC GND
3V RE 1.5V 1.5V 0V tZH OUTPUT HIGH VOH - 0.5V RO 1.5V 0V tHZ VOH
PARAMETER tHZ tLZ tZH tZL
DE 0 0 0 0
A +1.5V -1.5V +1.5V -1.5V
SW GND VCC GND VCC
RO
tZL
tLZ VCC 1.5V OUTPUT LOW VOL + 0.5V V OL
FIGURE 6A. TEST CIRCUIT
FIGURE 6B. MEASUREMENT POINTS
FIGURE 6. RECEIVER ENABLE AND DISABLE TIMES
Application Information
RS-485 and RS-422 are differential (balanced) data transmission standards for use in long haul or noisy environments. RS-422 is a subset of RS-485, so RS-485 transceivers are also RS-422 compliant. RS-422 is a pointto-multipoint (multidrop) standard, which allows only one driver and up to 10 (assuming one unit load devices) receivers on each bus. RS-485 is a true multipoint standard, which allows up to 32 one unit load devices (any combination of drivers and receivers) on each bus. To allow for multipoint operation, the RS-485 spec requires that drivers must handle bus contention without sustaining any damage. Another important advantage of RS-485 is the extended common mode range (CMR), which specifies that the driver outputs and receiver inputs withstand signals that range from +12V to -7V. RS-422 and RS-485 are intended for runs as long as 4000', so the wide CMR is necessary to handle ground potential differences, as well as voltages induced in the cable by external fields.
Receiver Features
This device utilizes a differential input receiver for maximum noise immunity and common mode rejection. Input sensitivity is 200mV, as required by the RS422 and RS-485 specifications. Receiver input resistance surpasses the RS-422 spec of 4k, and meets the RS-485 "Unit Load" requirement of 12k minimum, thereby allowing up to 32 devices on a bus. Receiver inputs function with common mode voltages as great as 7V outside the power supplies (i.e., +12V and -7V), making them ideal for long networks, or industrial applications, where induced voltages are a definite concern. The receiver includes a "fail-safe if open" function that guarantees a high level receiver output if the receiver inputs are unconnected (floating). The receiver easily meets the data rate supported by the driver, and receiver outputs are three-statable via the active low RE input.
6
ISL81485
Driver Features
The RS-485, RS-422 driver is a differential output device that delivers at least 2V across a 54 load (RS-485), and at least 2.5V across a 100 load (RS-422) even with VCC = 4.5V. The drivers feature low propagation delay skew to maximize bit width, and to minimize EMI. The driver is three-statable via the active high DE input. Outputs of the driver are not slew rate limited, so faster output transition times allow data rates of at least 30Mbps. Proper termination is imperative, when using a 30Mbps device, to minimize reflections. In point-to-point, or point-tomultipoint (single driver on bus) networks, the main cable should be terminated in its characteristic impedance (typically 120) at the end farthest from the driver. In multireceiver applications, stubs connecting receivers to the main cable should be kept as short as possible. Multipoint (multidriver) systems require that the main cable be terminated in its characteristic impedance at both ends. Stubs connecting a transceiver to the main cable should be kept as short as possible.
Data Rate, Cables, and Terminations
RS-485/RS-422 are intended for network lengths up to 4000', but the maximum system data rate decreases as the transmission length increases. Devices operating at 30Mbps usually are limited to lengths of a couple hundred feet, but the larger differential output voltage of this transceiver allows that distance to be pushed past 350'. Figure 7 illustrates the 30Mbps performance of the ISL81485 driving 350' of CAT5 cable, terminated in 120 at both the driver and receiver ends. As shown, the differential signal (A-B) delivered to the receiver inputs at the end of the cable is still greater than 1.5V (i.e., 7.5 times the required Rx sensitivity). Thus, even longer cables can be driven if lower noise margins are acceptable. 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.
Built-In Driver Overload Protection
As stated previously, the RS-485 spec requires that drivers survive worst case bus contentions undamaged. The ISL81485 meets this requirement via driver output short circuit current limits, and on-chip thermal shutdown circuitry. The driver output stages incorporate short circuit current limiting circuitry which ensures that the output current never exceeds the RS-485 spec, even at the common mode voltage range extremes. In the event of a major short circuit condition, the device also includes 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 reenable after the die temperature drops about 15 degrees. If the contention persists, the thermal shutdown/reenable cycle repeats until the fault is cleared. Receivers stay operational during thermal shutdown.
Typical Performance Curves
RECEIVER OUTPUT (V) DI = 30Mbps
VCC = 5V, TA = 25oC; Unless Otherwise Specified
DRIVER INPUT (V) 160 140 120 100 80 60 40 20 0 -20 -40
5 0 5 RO 0
Y OR Z = LOW
RECEIVER INPUT (V)
DRIVER+CABLE DELAY 3 1.5 A-B 0 -1.5 -3
(~490ns)
OUTPUT CURRENT (mA)
-60 -80 -100 -120 -140 -160 -7 -6 -4 -2
Y OR Z = HIGH Y OR Z = HIGH
TIME (20ns/DIV)
FIGURE 7. DRIVER AND RECEIVER WAVEFORMS DRIVING 350 FEET (107 METERS) OF CAT5 CABLE (DOUBLE TERMINATED WITH 120)
0 2 4 6 OUTPUT VOLTAGE (V)
8
10
12
FIGURE 8. DRIVER OUTPUT CURRENT vs SHORT CIRCUIT VOLTAGE
7
ISL81485 Typical Performance Curves
120 DIFFERENTIAL OUTPUT VOLTAGE (V) DRIVER OUTPUT CURRENT (mA) 100 80 60 40 20 0 0 1 2 3 4 DIFFERENTIAL OUTPUT VOLTAGE (V) 5
VCC = 5V, TA = 25oC; Unless Otherwise Specified (Continued)
4 3.8 3.6 3.4 3.2 3 2.8 -40 RDIFF = 54 RDIFF = 100
-25
0
25
50
75
85
TEMPERATURE (oC)
FIGURE 9. DRIVER OUTPUT CURRENT vs DIFFERENTIAL OUTPUT VOLTAGE
FIGURE 10. DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs TEMPERATURE
12 RDIFF = 54 11 PROPAGATION DELAY (ns) tPLHZ tPLHY 10 SKEW (ns)
3 RDIFF = 54 2.5 |tPHL(Y or Z) - tPLH(Y or Z)| = PW Distortion 2
1.5
9 tPHLY 8 tPHLZ
1
|tPHLY - tPLHZ| or |tPLHY - tPHLZ|
0.5 7 -40
-25
0
25
50
75
85
0 -40
TEMPERATURE (oC)
-25
0 25 TEMPERATURE (oC)
50
75
85
FIGURE 11. DRIVER PROPAGATION DELAY vs TEMPERATURE
FIGURE 12. DRIVER SKEW AND PULSE DISTORTION vs TEMPERATURE
DRIVER INPUT (V)
RECEIVER OUTPUT (V)
RECEIVER OUTPUT (V)
RDIFF = 54, CL = 15pF DI 5 0 5 RO 0
RDIFF = 54, CL = 15pF DI 5 0 5 RO 0
DRIVER OUTPUT (V)
DRIVER OUTPUT (V)
5 4 3 2 1 0 TIME (10ns/DIV) B/Z A/Y
5 4 3 2 1 0 TIME (10ns/DIV) A/Y B/Z
FIGURE 13. DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH
FIGURE 14. DRIVER AND RECEIVER WAVEFORMS, HIGH TO LOW
8
DRIVER INPUT (V)
ISL81485 Typical Performance Curves
950
VCC = 5V, TA = 25oC; Unless Otherwise Specified (Continued)
900
DE = VCC, RE = X
850 ICC (A)
800
DE = GND, RE = X 750
700 -40
-25
0
25
50
75
85
TEMPERATURE (oC)
FIGURE 15. SUPPLY CURRENT vs TEMPERATURE
Die Characteristics
SUBSTRATE POTENTIAL (POWERED UP): GND TRANSISTOR COUNT: 528 PROCESS: Si Gate BiCMOS
9
ISL81485 Mini Small Outline Plastic Packages (MSOP)
N
M8.118 (JEDEC MO-187AA)
8 LEAD MINI SMALL OUTLINE PLASTIC PACKAGE
E1 E
INCHES SYMBOL MIN 0.037 0.002 0.030 0.010 0.004 0.116 0.116 MAX 0.043 0.006 0.037 0.014 0.008 0.120 0.120
MILLIMETERS MIN 0.94 0.05 0.75 0.25 0.09 2.95 2.95 MAX 1.10 0.15 0.95 0.36 0.20 3.05 3.05 NOTES 9 3 4 6 7 15o 6o Rev. 2 01/03
INDEX AREA
-B12 TOP VIEW 0.25 (0.010) GAUGE PLANE SEATING PLANE -C4X R1 R 0.20 (0.008) ABC
A A1 A2 b c D E1
4X L L1
e E L
0.026 BSC 0.187 0.016 0.199 0.028
0.65 BSC 4.75 0.40 5.05 0.70
A
A2
A1
-He D
b
0.10 (0.004) -A0.20 (0.008)
C
SEATING PLANE
L1 N R
0.037 REF 8 0.003 0.003 5o 0o 15o 6o
0.95 REF 8 0.07 0.07 5o 0o
C a C L E1
C
R1 0
SIDE VIEW
-B-
0.20 (0.008)
CD
END VIEW
NOTES: 1. These package dimensions are within allowable dimensions of JEDEC MO-187BA. 2. Dimensioning and tolerancing per ANSI Y14.5M-1994. 3. Dimension "D" does not include mold flash, protrusions or gate burrs and are measured at Datum Plane. Mold flash, protrusion and gate burrs shall not exceed 0.15mm (0.006 inch) per side. 4. Dimension "E1" does not include interlead flash or protrusions and are measured at Datum Plane. - H - Interlead flash and protrusions shall not exceed 0.15mm (0.006 inch) per side. 5. Formed leads shall be planar with respect to one another within 0.10mm (0.004) at seating Plane. 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 0.08mm (0.003 inch) total in excess of "b" dimension at maximum material condition. Minimum space between protrusion and adjacent lead is 0.07mm (0.0027 inch). 10. Datums -A -H- . and - B - to be determined at Datum plane
11. Controlling dimension: MILLIMETER. Converted inch dimensions are for reference only.
10
ISL81485 Small Outline Plastic Packages (SOIC)
N INDEX AREA E -B1 2 3 SEATING PLANE -AD -CA h x 45o H 0.25(0.010) M BM
M8.15 (JEDEC MS-012-AA ISSUE C)
8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE INCHES SYMBOL A
L
MILLIMETERS MIN 1.35 0.10 0.33 0.19 4.80 3.80 MAX 1.75 0.25 0.51 0.25 5.00 4.00 NOTES 9 3 4 5 6 7 8o Rev. 0 12/93
MIN 0.0532 0.0040 0.013 0.0075 0.1890 0.1497
MAX 0.0688 0.0098 0.020 0.0098 0.1968 0.1574
A1 B C D E

A1 0.10(0.004) C
e H h L N
0.050 BSC 0.2284 0.0099 0.016 8 0o 8o 0.2440 0.0196 0.050
1.27 BSC 5.80 0.25 0.40 8 0o 6.20 0.50 1.27
e
B 0.25(0.010) M C AM BS
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 0.15mm (0.006 inch) per side. 4. Dimension "E" does not include interlead flash or protrusions. Interlead flash and protrusions shall not exceed 0.25mm (0.010 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. The lead width "B", as measured 0.36mm (0.014 inch) or greater above the seating plane, shall not exceed a maximum value of 0.61mm (0.024 inch). 10. Controlling dimension: MILLIMETER. Converted inch dimensions are not necessarily exact.
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 11

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