ISL4489E INTERSIL [Intersil Corporation], ISL4489E Datasheet

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ISL4489E

Manufacturer Part Number
ISL4489E
Description
Low Power, High Speed and Slew Rate Limited, Full Duplex, RS-485/RS-422 Transceivers
Manufacturer
INTERSIL [Intersil Corporation]
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ISL4489EIBZ
Manufacturer:
INTERSIL
Quantity:
20 000
±
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.
NUMBER
ISL4489E
ISL4491E
15kV ESD Protected, 1/8 Unit Load, 5V,
PART
HALF/FULL
DUPLEX
Full
Full
HIGH ESD?
®
1
Yes
Yes
Data Sheet
ALLOWED ON BUS
NO. OF DEVICES
TABLE 1. SUMMARY OF FEATURES
256
256
1-888-INTERSIL or 321-724-7143
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
DATA RATE
(Mbps)
0.25
15
Features
• Pb-free Available as an Option (RoHS Compliant)
• RS-485 I/O Pin ESD Protection
• 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
• Very Low Quiescent Current:
• -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
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”
(See Ordering Info)
- Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM
Transmission (ISL4489E)
- 140
- 370
Overload Protection
October 27, 2004
SLEW-RATE
LIMITED?
µ
µ
All other trademarks mentioned are the property of their respective owners.
A (ISL4489E)
A (ISL4491E)
Yes
No
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2004. All Rights Reserved.
DRIVER ENABLE?
ISL4489E, ISL4491E
RECEIVER/
Yes
Yes
. . . . . . . . . . . . . ±
QUIESCENT
I
CC
140
370
(µA)
FN6074.2
15kV HBM
COUNT
PIN
14
14

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ISL4489E Summary of contents

Page 1

... 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. ...

Page 2

... Connection. 2 ISL4489E, ISL4491E Pinout PKG. DWG. # M14.15 M14.15 M14.15 M14.15 M14.15 M14.15 OUTPUTS High-Z High FUNCTION ISL4489E, ISL4491E (SOIC) TOP VIEW GND GND ...

Page 3

... Typical Operating Circuit +5V + 0.1µ GND ISL4489E, ISL4491E ISL4489E, ISL4491E T +5V + 0.1µ GND 6, 7 FN6074.2 ...

Page 4

... -4mA 200mV -4mA 200mV 0.4V ≤ V ≤ 2.4V O -7V ≤ V ≤ 12V IN CM ISL4489E, DE, DI ISL4491E, DE, DI -7V ≤ V ≤ 12V (Note ≤ V ≤ θ (°C/W) JA 128 = 5V 25°C, ...

Page 5

... Electrical Specifications Test Conditions: V Note 2 (Continued) PARAMETER SYMBOL SWITCHING CHARACTERISTICS (ISL4489E) Driver Input to Output Delay t PLH Driver Output Skew t SKEW Driver Differential Rise or Fall Time t R Driver Enable to Output High t Driver Enable to Output Low t Driver Disable from Output High t Driver Disable from Output Low ...

Page 6

... Test Circuits and Waveforms SIGNAL GENERATOR FIGURE 2A. TEST CIRCUIT FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES 6 ISL4489E, ISL4491E FIGURE 1. DRIVER V AND 100pF L OUT (Y) DIFF C = 100pF L OUT (Z) DIFF OUT ( SKEW = | ...

Page 7

... R A SIGNAL GENERATOR FIGURE 4A. TEST CIRCUIT SIGNAL A GENERATOR PARAMETER FIGURE 5A. TEST CIRCUIT 7 ISL4489E, ISL4491E (Continued) 500Ω GND SW OUT ( (pF) L 1/0 GND 15 0 OUT (Y, Z) 1/0 GND 100 0/1 V 100 CC FIGURE 3. DRIVER ENABLE AND DISABLE TIMES 15pF FIGURE 4 ...

Page 8

... 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 ...

Page 9

... ISL4489E 250 200 150 HIGH 100 100Ω DIFF 3 2 -40 - TEMPERATURE (°C) TEMPERATURE ISL4491E ISL4489E -40 0 -25 25 TEMPERATURE (°C) FIGURE 9. SUPPLY CURRENT vs TEMPERATURE R = 54Ω DIFF FN6074.2 ...

Page 10

... LOW TO HIGH (ISL4489E) 10 ISL4489E, ISL4491E 25°C; Unless Otherwise Specified (Continued 250 200 t PLHY t PLHZ 150 100 t PHLY t PHLZ FIGURE 11. DRIVER SKEW vs TEMPERATURE (ISL4489E PHLZ FIGURE 13. DRIVER SKEW vs TEMPERATURE = 54Ω 100pF FIGURE 15 ...

Page 11

... TIME (20ns/DIV) FIGURE 16. DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH (ISL4491E) Die Characteristics SUBSTRATE POTENTIAL (POWERED UP): GND TRANSISTOR COUNT: 518 PROCESS: Si Gate BiCMOS 11 ISL4489E, ISL4491E 25°C; Unless Otherwise Specified (Continued 54Ω 100pF FIGURE 17 ...

Page 12

... 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 ISL4489E, ISL4491E M14.15 (JEDEC MS-012-AB ISSUE C) 14 LEAD NARROW BODY SMALL OUTLINE PLASTIC ...

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