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ISL4489E, ISL4491E
Data Sheet April 28, 2006 FN6074.3
15kV ESD Protected, 1/8 Unit Load, 5V, Low Power, High Speed and Slew Rate Limited, Full Duplex, RS-485/RS-422 Transceivers
The ISL4489E, ISL4491E are ESD protected, "fractional" unit load, BiCMOS, 5V powered, single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. Each driver output and receiver input is protected against 15kV ESD strikes, without latch-up. Unlike competitive versions, these Intersil devices are specified for 10% tolerance supplies (4.5V to 5.5V). Rx inputs and Tx outputs present a "1/8 unit load" to the RS-485 bus, which allows a total of 256 transmitters and receivers on the network for large node count systems. These devices are configured for full duplex (separate Rx input and Tx output pins) applications, so they are ideal for RS-422 networks requiring high ESD tolerance on the bus pins. The ISL4489E utilizes a slew rate limited driver which reduces EMI, and minimizes reflections from improperly terminated transmission lines, or unterminated stubs in multidrop and multipoint applications. Data rates up to 15Mbps are achievable by using the ISL4491E, which features higher slew rates. 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
* Pb-free Available as an Option (RoHS Compliant) (See Ordering Info) * RS-485 I/O Pin ESD Protection . . . . . . . . . . . . . 15kV HBM - Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM * 1/8 Unit Load Allows up to 256 Devices on the Bus * High Data Rates (ISL4491E) . . . . . . . . . . . up to 15Mbps * Slew Rate Limited Version for Error Free Data Transmission (ISL4489E) * Very Low Quiescent Current: - 140A (ISL4489E) - 370A (ISL4491E) * -7V to +12V Common Mode Input Voltage Range * Three-State Rx and Tx Outputs * Full Duplex Pinout * Operates from a Single +5V Supply (10% Tolerance) * Current Limiting and Thermal Shutdown for driver Overload Protection
Applications
* Factory Automation * Security Networks * Building Environmental Control Systems * Industrial/Process Control Networks * Level Translators (e.g., RS-232 to RS-422) * RS-232 "Extension Cords"
TABLE 1. SUMMARY OF FEATURES PART NUMBER ISL4489E ISL4491E HALF/FULL DUPLEX Full Full HIGH ESD? Yes Yes NO. OF DEVICES ALLOWED ON BUS 256 256 DATA RATE (Mbps) 0.25 15 SLEW-RATE RECEIVER/ QUIESCENT PIN LIMITED? DRIVER ENABLE? ICC (A) COUNT Yes No Yes Yes 140 370 14 14
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. 2004, 2006. All Rights Reserved. All other trademarks mentioned are the property of their respective owners.
ISL4489E, ISL4491E Ordering Information
PART NUMBER ISL4489EIB ISL4489EIBZ (Note) ISL4491EIB ISL4491EIBZ (Note) PART TEMP. MARKING RANGE (C) ISL4489EIB 4489EIBZ ISL4491EIB 4491EIBZ -40 to 85 -40 to 85 -40 to 85 -40 to 85 PACKAGE 14 Ld SOIC 14 Ld SOIC (Pb-free) 14 Ld SOIC 14 Ld SOIC (Pb-free) PKG. DWG. # M14.15
NC 1
Pinout
ISL4489E, ISL4491E (SOIC) TOP VIEW
M14.15
RO 2 R
14 VCC 13 NC 12 A 11 B D 10 Z 9Y 8 NC
M14.15 M14.15
RE 3 DE 4 DI 5 GND 6 GND 7
Add "-T" suffix for tape and reel. NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are 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.
Truth Tables
TRANSMITTING INPUTS RE X X X DE 1 1 0 DI 1 0 X Z 0 1 High-Z OUTPUTS Y 1 0 High-Z RE 0 0 0 1 RECEIVING INPUTS DE X X X X A-B +0.2V -0.2V Inputs Open X OUTPUT RO 1 0 1 High-Z
Pin Descriptions
PIN RO RE DE DI GND A B Y Z VCC NC 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. 15kV HBM ESD Protected, Noninverting receiver input. 15kV HBM ESD Protected, Inverting receiver input. 15kV HBM ESD Protected, Noninverting driver output. 15kV HBM ESD Protected, Inverting driver output. System power supply input (4.5V to 5.5V). No Connection.
2
FN6074.3
ISL4489E, ISL4491E Typical Operating Circuit
ISL4489E, ISL4491E
+5V + 0.1F 14 VCC 2 3 4 5 RO RE DE Z DI D GND 6, 7 Y 10 9 RT 11 12 B A GND 6, 7 R RO 2 R A B 12 11 RT 0.1F 14 9 10 Y Z VCC DI D DE RE 4 3 5 + +5V
3
FN6074.3
ISL4489E, ISL4491E
Absolute Maximum Ratings
VCC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V Input Voltages DI, DE, RE . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (VCC +0.5V) Input/Output Voltages A, B, Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -8V to +12.5V RO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (VCC +0.5V) Short Circuit Duration Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table
Thermal Information
Thermal Resistance (Typical, Note 1)
JA (C/W)
14 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . 128 Maximum Junction Temperature (Plastic Package) . . . . . . . 150C Maximum Storage Temperature Range . . . . . . . . . . . -65C to 150C Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300C (Lead Tips Only)
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . -40C to 85C
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 low 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 = 25C, Note 2 SYMBOL TEST CONDITIONS TEMP (C) MIN TYP MAX UNITS
PARAMETER DC CHARACTERISTICS Driver Differential VOUT (no load) Driver Differential VOUT (with load)
VOD1 VOD2 VOD R = 50 (RS-422) (Figure 1) R = 27 (RS-485) (Figure 1)
Full Full Full Full
2 1.5 -
3 2.3 0.01
VCC 5 0.2
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
R = 27 or 50 (Figure 1)
VOC VOC
R = 27 or 50 (Figure 1) R = 27 or 50 (Figure 1)
Full Full
-
0.01
3 0.2
V V
VIH VIL IIN1
DE, DI, RE DE, DI, RE DI DE, RE
Full Full Full Full VIN = 12V VIN = -7V Full Full Full Full 25 Full Full Full Full Full Full Full Full
2 0.8 -2 -40 -100 -100 -0.2 3.5 92 35 7
70 120 140 370 -
2 40 130 100 0.2 0.4 1 190 460 250 85
V V A A A A A V mV V V A k A A mA mA
Input Current (A, B) (Note 5)
IIN2
DE = 0V, VCC = 0V or 4.5 to 5.5V -7V VO 12V -7V VCM 12V VCM = 0V IO = -4mA, VID = 200mV IO = -4mA, VID = 200mV 0.4V VO 2.4V -7V VCM 12V
Driver Three-State (high impedance) Output Current (Y, Z) 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)
IOZD VTH VTH VOH VOL IOZR RIN ICC
ISL4489E, DE, DI, RE = 0V or VCC ISL4491E, DE, DI, RE = 0V or VCC DE = VCC, -7V VY or VZ 12V (Note 4) 0V VO VCC
Driver Short-Circuit Current, VO = High or Low Receiver Short-Circuit Current
IOSD1 IOSR
4
FN6074.3
ISL4489E, ISL4491E
Electrical Specifications
Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at VCC = 5V, TA = 25C, Note 2 (Continued) SYMBOL TEST CONDITIONS TEMP (C) MIN TYP MAX UNITS
PARAMETER
SWITCHING CHARACTERISTICS (ISL4489E) Driver Input to Output Delay Driver Output Skew Driver Differential Rise or Fall Time Driver Enable to Output High Driver Enable to Output Low Driver Disable from Output High Driver Disable from Output Low Receiver Input to Output Delay Receiver Skew | tPLH - tPHL | Receiver Enable to Output High Receiver Enable to Output Low Receiver Disable from Output High Receiver Disable from Output Low Maximum Data Rate tPLH, tPHL RDIFF = 54, CL = 100pF (Figure 2) tSKEW tR, tF tZH tZL tHZ tLZ RDIFF = 54, CL = 100pF (Figure 2) RDIFF = 54, CL = 100pF (Figure 2) CL = 100pF, SW = GND (Figure 3) CL = 100pF, SW = VCC (Figure 3) CL = 15pF, SW = GND (Figure 3) CL = 15pF, SW = VCC (Figure 3) Full Full Full Full Full Full Full Full 25 Full Full Full Full Full 250 250 250 250 300 300 250 250 400 160 600 1000 860 660 640 500 60 10 10 10 10 2000 800 2000 2000 2000 3000 3000 2000 50 50 50 50 ns ns ns ns ns ns ns ns ns ns ns ns ns kbps
tPLH, tPHL Figure 4 tSKD tZH tZL tHZ tLZ fMAX Figure 4 CL = 15pF, SW = GND (Figure 5) CL = 15pF, SW = VCC (Figure 5) CL = 15pF, SW = GND (Figure 5) CL = 15pF, SW = VCC (Figure 5)
SWITCHING CHARACTERISTICS (ISL4491E) Driver Input to Output Delay Driver Output Skew Driver Differential Rise or Fall Time Driver Enable to Output High Driver Enable to Output Low Driver Disable from Output High Driver Disable from Output Low Receiver Input to Output Delay Receiver Skew | tPLH - tPHL | Receiver Enable to Output High Receiver Enable to Output Low Receiver Disable from Output High Receiver Disable from Output Low Maximum Data Rate ESD PERFORMANCE RS-485 Pins (A, B, Y, Z) All Other Pins NOTES: 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 "1/8 unit load (1/8 UL)" transceivers. The RS-485 standard allows up to 32 Unit Loads on the bus, so there can be 256 1/8 UL devices on a bus. Human Body Model 25 25 15 >7 kV kV tPLH, tPHL RDIFF = 54, CL = 100pF (Figure 2) tSKEW tR, tF tZH tZL tHZ tLZ RDIFF = 54, CL = 100pF (Figure 2) RDIFF = 54, CL = 100pF (Figure 2) CL = 100pF, SW = GND (Figure 3) CL = 100pF, SW = VCC (Figure 3) CL = 15pF, SW = GND (Figure 3) CL = 15pF, SW = VCC (Figure 3) Full Full Full Full Full Full Full Full 25 Full Full Full Full Full 13 5 30 15 24 3 12 14 14 44 21 90 5 9 9 9 9 40 10 20 70 70 70 70 150 50 50 50 50 ns ns ns ns ns ns ns ns ns ns ns ns ns Mbps
tPLH, tPHL (Figure 4) tSKD tZH tZL tHZ tLZ fMAX (Figure 4) CL = 15pF, SW = GND (Figure 5) CL = 15pF, SW = VCC (Figure 5) CL = 15pF, SW = GND (Figure 5) CL = 15pF, SW = VCC (Figure 5)
5
FN6074.3
ISL4489E, ISL4491E Test Circuits and Waveforms
R VCC DE Z DI D Y R VOC VOD
FIGURE 1. DRIVER VOD AND VOC
3V DI 1.5V 1.5V 0V tPLH DE DI D Y SIGNAL GENERATOR Z RDIFF CL = 100pF OUT (Z) tPHL 50% tPLH VOH 50% VOL CL = 100pF OUT (Y) 50% 50% VOL tPHL VOH
VCC
DIFF OUT (Y - Z) tR
90% 10%
90% 10% tF
+VOD -VOD
SKEW = |tPLH (Y or Z) - tPHL (Z or Y)|
FIGURE 2A. TEST CIRCUIT
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
6
FN6074.3
ISL4489E, ISL4491E Test Circuits and Waveforms (Continued)
DE DI D SIGNAL GENERATOR Y CL SW Z 500 3V VCC GND tZH OUTPUT HIGH OUT (Y, Z) 2.3V 0V tZL OUT (Y, Z) tLZ VCC 2.3V OUTPUT LOW VOL + 0.5V V OL tHZ VOH - 0.5V VOH DE 1.5V 1.5V 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) 15 15 100 100
FIGURE 3A. TEST CIRCUIT
FIGURE 3B. MEASUREMENT POINTS
FIGURE 3. DRIVER ENABLE AND DISABLE TIMES
RE +1.5V B A R 15pF RO tPLH SIGNAL GENERATOR RO 50% tPHL A 1.5V 1.5V
3V 0V
VCC 50% 0V
FIGURE 4A. TEST CIRCUIT
FIGURE 4B. MEASUREMENT POINTS
FIGURE 4. RECEIVER PROPAGATION DELAY
RE B R SIGNAL GENERATOR A 15pF RO RO 1k SW VCC GND tZH OUTPUT HIGH 1.5V tHZ RE 1.5V 1.5V
3V 0V
VOH - 0.5V VOH 0V
PARAMETER tHZ tLZ tZH tZL
DE X X X X
A +1.5V -1.5V +1.5V -1.5V
SW GND VCC GND VCC FIGURE 5B. MEASUREMENT POINTS
RO tZL tLZ VCC 1.5V OUTPUT LOW VOL + 0.5V V
OL
FIGURE 5A. TEST CIRCUIT
FIGURE 5. RECEIVER ENABLE AND DISABLE TIMES
7
FN6074.3
ISL4489E, ISL4491E 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. rate limited versions are a maximum of 250kbps. Outputs of ISL4491E drivers are not limited, so faster output transition times allow data rates of at least 15Mbps.
Data Rate, Cables, and Terminations
Twisted pair is the cable of choice for RS-485/422 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. RS-485/422 are intended for network lengths up to 4000', but the maximum system data rate decreases as the transmission length increases. Devices operating at 15Mbps are limited to lengths of a few hundred feet, while the 250kbps versions can operate at full data rates with lengths in excess of 1000'. Proper termination is imperative, when using the 15Mbps devices, to minimize reflections. Short networks using the 250kbps versions need not be terminated, but, terminations are recommended unless power dissipation is an overriding concern. In point-to-point, or point-to-multipoint (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 multi-receiver applications, stubs connecting receivers to the main cable should be kept as short as possible. Multipoint (multi-driver) 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.
Receiver Features
These devices utilize a differential input receiver for maximum noise immunity and common mode rejection. Input sensitivity is 200mV, as required by the RS-422 and RS-485 specifications. Receiver input resistance of 120k surpasses the RS-422 spec of 4k, and is more than eight times the RS-485 "Unit Load" requirement of 12k. Thus, these products are known as "one-eighth UL" transceivers, and there can be up to 256 of these devices on a network while still complying with the RS-485 loading spec. 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 where induced voltages are a realistic concern. All the receivers include a "fail-safe if open" function that guarantees a high level receiver output if the receiver inputs are unconnected (floating). Receivers easily meet the data rate supported by the corresponding driver, and receiver outputs are three-statable via the active low RE input.
Built-In Driver Overload Protection
As stated previously, the RS-485 spec requires that drivers survive worst case bus contentions undamaged. The ISL44XXE devices meet 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. Additionally, these devices utilize a foldback circuit which reduces the short circuit current, and thus the power dissipation, whenever the contending voltage exceeds either supply. In the event of a major short circuit condition, ISL44XXE 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 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.
Driver Features
The RS-485/422 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 width, and to minimize EMI, and driver outputs are three-statable via the active high DE input. The ISL4489E driver outputs are slew rate limited to further reduce EMI, and to minimize reflections in unterminated or improperly terminated networks. Data rates on these slew 8
FN6074.3
ISL4489E, ISL4491E ESD Protection
All pins on these devices include class 3 Human Body Model (HBM) ESD protection structures, but the RS-485 pins (driver outputs and receiver inputs) incorporate advanced structures allowing them to survive ESD events in excess of 15kV HBM. The RS-485 pins are particularly vulnerable to ESD damage because they typically connect to an exposed port on the exterior of the finished product. Simply touching the port pins, or connecting a cable, can cause an ESD event that might destroy unprotected ICs. These new ESD structures protect the device whether or not it is powered up, protect without allowing any latchup mechanism to activate, and without degrading the RS-485 common mode range of -7V to +12V. This built-in ESD protection eliminates the need for board level protection structures (e.g., transient suppression diodes), and the associated, undesirable capacitive load they present.
Typical Performance Curves
90 80 DRIVER OUTPUT CURRENT (mA) 70 60 50 40 30 20 10 0 0 1 2 3
VCC = 5V, TA = 25C; Unless Otherwise Specified
3.6 3.4 3.2 3 2.8 2.6 2.4 2.2 2 -40 RDIFF = 54 RDIFF = 100
4
5
DIFFERENTIAL OUTPUT VOLTAGE (V)
-25
0
25
50
75
85
DIFFERENTIAL OUTPUT VOLTAGE (V)
TEMPERATURE (C)
FIGURE 6. DRIVER OUTPUT CURRENT vs DIFFERENTIAL OUTPUT VOLTAGE
FIGURE 7. DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs TEMPERATURE
400 160 140 120 100 OUTPUT CURRENT (mA) 80 60 40 20 0 -20 -40 -60 ISL4491E 50 -2 0 2 4 6 OUTPUT VOLTAGE (V) 8 10 12 -40 -25 0 25 TEMPERATURE (C) 50 75 85 150 Y OR Z = HIGH 100 Y OR Z = LOW ISL4489E ICC (A) ISL4491E 300 250 200 ISL4489E, DE = X, RE = X 350 ISL4491E, DE = X, RE = X
-80 ISL4489E -100 -120 -7 -6 -4
FIGURE 9. SUPPLY CURRENT vs TEMPERATURE
FIGURE 8. DRIVER OUTPUT CURRENT vs SHORT CIRCUIT VOLTAGE
9
FN6074.3
ISL4489E, ISL4491E Typical Performance Curves
750
VCC = 5V, TA = 25C; Unless Otherwise Specified (Continued)
250
700 PROPAGATION DELAY (ns)
tPLHY tPLHZ
200 |tPLHY - tPHLZ| 150 SKEW (ns)
650
600 tPHLY 550 tPHLZ 500
|tPHLY - tPLHZ| 100
50 |CROSS PT. OF Y & Z - CROSS PT. OF Y & Z| 0 -40
450 -40
-25
0
25 TEMPERATURE (C)
50
75
85
-25
0 25 TEMPERATURE (C)
50
75
85
FIGURE 10. DRIVER PROPAGATION DELAY vs TEMPERATURE (ISL4489E)
30 28
FIGURE 11. DRIVER SKEW vs TEMPERATURE (ISL4489E)
5
4 PROPAGATION DELAY (ns) 26 24 tPLHY 22 tPLHZ 20 1 18 tPHLY 16 -40 -25 0 25 TEMPERATURE (C) 50 75 85 0 -40 -25 0 25 TEMPERATURE (C) 50 75 85 |CROSSING PT. OF Y & Z - CROSSING PT. OF Y & Z| tPHLZ SKEW (ns) 3 |tPLHY - tPHLZ| 2 |tPHLY - tPLHZ|
FIGURE 12. DRIVER PROPAGATION DELAY vs TEMPERATURE (ISL4491E)
FIGURE 13. DRIVER SKEW vs TEMPERATURE (ISL4491E)
DRIVER INPUT (V)
RECEIVER OUTPUT (V)
RECEIVER OUTPUT (V)
RDIFF = 54, CL = 100pF DI 5 0 5 RO 0
RDIFF = 54, CL = 100pF 5 DI 0 5 RO 0
DRIVER OUTPUT (V)
DRIVER OUTPUT (V)
4 Z 3 2 1 0 TIME (400ns/DIV) Y
4 3 2 1 0 TIME (400ns/DIV) Y Z
FIGURE 14. DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH (ISL4489E)
FIGURE 15. DRIVER AND RECEIVER WAVEFORMS, HIGH TO LOW (ISL4489E)
10
FN6074.3
DRIVER INPUT (V)
ISL4489E, ISL4491E Typical Performance Curves
RECEIVER OUTPUT (V)
VCC = 5V, TA = 25C; Unless Otherwise Specified (Continued)
DRIVER INPUT (V) RECEIVER OUTPUT (V) RDIFF = 54, CL = 100pF DI 5 0 5 RO 0 DRIVER INPUT (V)
RDIFF = 54, CL = 100pF DI 5 0 5 RO 0
DRIVER OUTPUT (V)
DRIVER OUTPUT (V)
4 Z 3 2 1 0 TIME (20ns/DIV) Y
4 3 2 1 0 TIME (20ns/DIV) Y Z
FIGURE 16. DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH (ISL4491E)
FIGURE 17. DRIVER AND RECEIVER WAVEFORMS, HIGH TO LOW (ISL4491E)
Die Characteristics
SUBSTRATE POTENTIAL (POWERED UP): GND TRANSISTOR COUNT: 518 PROCESS: Si Gate BiCMOS
11
FN6074.3
ISL4489E, ISL4491E Small Outline Plastic Packages (SOIC)
N INDEX AREA H E -B1 2 3 SEATING PLANE -AD -CA h x 45o 0.25(0.010) M BM
M14.15 (JEDEC MS-012-AB ISSUE C)
14 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE INCHES SYMBOL A
L
MILLIMETERS MIN 1.35 0.10 0.33 0.19 8.55 3.80 5.80 0.25 0.40 14 0o MAX 1.75 0.25 0.51 0.25 8.75 4.00 6.20 0.50 1.27 8o NOTES 9 3 4 5 6 7 Rev. 0 12/93
MIN 0.0532 0.0040 0.013 0.0075 0.3367 0.1497 0.2284 0.0099 0.016 14 0o
MAX 0.0688 0.0098 0.020 0.0098 0.3444 0.1574 0.2440 0.0196 0.050 8o
A1 B C D E e
C
A1 0.10(0.004)
e
B 0.25(0.010) M C AM BS
0.050 BSC
1.27 BSC
H h L N
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 12
FN6074.3

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