TXRX RS-485/422 5V LP 14-SOIC

 

ISL8491IBZ

Manufacturer Part NumberISL8491IBZ
DescriptionTXRX RS-485/422 5V LP 14-SOIC
ManufacturerIntersil
TypeTransceiver
ISL8491IBZ datasheets

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Specifications of ISL8491IBZ

Number Of Drivers/receivers1/1ProtocolRS422, RS485
Voltage - Supply4.5 V ~ 5.5 VMounting TypeSurface Mount
Package / Case14-SOIC (3.9mm Width), 14-SOLLead Free Status / RoHS StatusLead free / RoHS Compliant
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Data Sheet
5V, Low Power, High Speed or Slew Rate
Limited, RS-485/RS-422 Transceivers
The Intersil RS-485/RS-422 devices are BiCMOS 5V
powered, single transceivers that meet both the RS-485 and
RS-422 standards for balanced communication. Unlike
competitive devices, this Intersil family is specified for 10%
tolerance supplies (4.5V to 5.5V).
The ISL8483, ISL8488, and ISL8489 utilize slew rate limited
drivers which reduce EMI, and minimize reflections from
improperly terminated transmission lines, or unterminated
stubs in multidrop and multipoint applications.
Data rates up to 5Mbps are achievable by using the
ISL8485, ISL8490, or ISL8491, which feature higher slew
rates.
All devices present a “single 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.
The ISL8488 - 91 are configured for full duplex (separate Rx
input and Tx output pins) applications. The ISL8488 and
ISL8490 are offered in space saving 8 lead packages for
applications not requiring Rx and Tx output disable functions
(e.g., point-to-point). Half duplex configurations (ISL8483,
ISL8485) multiplex the Rx inputs and Tx outputs to allow
transceivers with Rx and Tx disable functions in 8 lead
packages.
PART
HALF/FULL
NO. OF DEVICES
NUMBER
DUPLEX
ALLOWED ON BUS
ISL8483
Half
32
ISL8485
Half
32
ISL8488
Full
32
ISL8489
Full
32
ISL8490
Full
32
ISL8491
Full
32
1
ISL8483, ISL8485, ISL8488,
ISL8489, ISL8490, ISL8491
February 28, 2006
Features
• Specified for 10% Tolerance Supplies
• Class 3 ESD Protection (HBM) on all Pins. . . . . . . . >7kV
• High Data Rates. . . . . . . . . . . . . . . . . . . . . . up to 5Mbps
• Slew Rate Limited Versions for Error Free Data
Transmission at 250kbps (ISL8483, ISL8488, ISL8489)
• Single Unit Load Allows up to 32 Devices on the Bus
• 1nA Low Current Shutdown Mode (ISL8483)
• Low Quiescent Current:
µ
- 160
A (ISL8483, ISL8488, ISL8489)
µ
- 500
A (ISL8485, ISL8490, ISL8491)
• -7V to +12V Common Mode Input Voltage Range
• Three State Rx and Tx Outputs (Except ISL8488,
ISL8490)
• 30ns Propagation Delays, 5ns Skew (ISL8485, ISL8490,
ISL8491)
• Full Duplex and Half Duplex Pinouts
• Operate from a Single +5V Supply (10% Tolerance)
• Current Limiting and Thermal Shutdown for driver
Overload Protection
• Pb-Free Plus Anneal Available (RoHS Compliant)
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
DATA RATE
SLEW-RATE
RECEIVER/
(Mbps)
LIMITED?
DRIVER ENABLE?
0.25
Yes
Yes
5
No
Yes
0.25
Yes
No
0.25
Yes
Yes
5
No
No
5
No
Yes
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 © Intersil Americas Inc. 2003, 2005, 2006. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN6046.8
QUIESCENT
LOW POWER
PIN
I
(µA)
SHUTDOWN?
COUNT
CC
160
Yes
8
500
No
8
160
No
8
160
No
14
500
No
8
500
No
14

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ISL8491IBZ Summary of contents

  • Page 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 registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2003, 2005, 2006. All Rights Reserved. All other trademarks mentioned are the property of their respective owners. FN6046.8 QUIESCENT ...

  • Page 2

    ... ISL8491IB ISL8491IBZ (Note) 8491IBZ ISL8491IB-T ISL8491IB ISL8491IBZ-T (Note) 8491IBZ ISL8491IP ISL8491IP *Pb-free PDIPs can be used for through hole wave solder processing only. They are not intended for use in Reflow solder processing applications. 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 ...

  • Page 3

    ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Pinouts ISL8483, ISL8485 (PDIP, SOIC) TOP VIEW B A GND Truth Tables TRANSMITTING INPUTS ...

  • Page 4

    ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Typical Operating Circuits +5V + 0.1µ B/Z A GND 5 +5V + 0.1µ ...

  • Page 5

    ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Absolute Maximum Ratings V to Ground ...

  • Page 6

    ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Electrical Specifications Test Conditions: V Typicals are at V PARAMETER SYMBOL Receiver Input Resistance R No-Load Supply Current, Note Shutdown Supply Current I SHDN Driver Short-Circuit Current, I OSD1 V = ...

  • Page 7

    ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Electrical Specifications Test Conditions: V Typicals are at V PARAMETER SYMBOL Receiver Disable from Output Low t Maximum Data Rate f MAX Time to Shutdown (ISL8483 only) t SHDN Driver Enable from Shutdown to ...

  • Page 8

    ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Test Circuits and Waveforms SIGNAL GENERATOR FIGURE 2A. TEST CIRCUIT FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES SIGNAL Y GENERATOR ...

  • Page 9

    ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Test Circuits and Waveforms SIGNAL A GENERATOR (SHDN) for ISL8483 only. PARAMETER (Note (Note ...

  • Page 10

    ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 In point-to-point, or point-to-multipoint (single driver on bus) networks, the main cable should be terminated in its characteristic impedance (typically 120Ω) at the end farthest from the driver. In multi-receiver applications, stubs connecting receivers ...

  • Page 11

    ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Typical Performance Curves 160 140 120 LOW 100 -20 -40 -60 -80 -100 -120 - OUTPUT VOLTAGE (V) FIGURE ...

  • Page 12

    ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Typical Performance Curves R DIFF B A TIME (400ns/DIV) FIGURE 14. DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH (ISL8483, ISL8488, ISL8489) R DIFF DI 5 ...

  • Page 13

    ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Dual-In-Line Plastic Packages (PDIP INDEX N/2 AREA -B- -A- D BASE PLANE -C- SEATING PLANE 0.010 (0.25 NOTES: 1. Controlling Dimensions: ...

  • Page 14

    ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Dual-In-Line Plastic Packages (PDIP INDEX N/2 AREA -B- -A- D BASE PLANE -C- SEATING PLANE 0.010 (0.25 NOTES: 1. Controlling Dimensions: ...

  • Page 15

    ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 Small Outline Plastic Packages (SOIC) N INDEX 0.25(0.010) H AREA E - SEATING PLANE - -C- α 0.10(0.004) 0.25(0.010 NOTES: ...

  • Page 16

    ... 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 ...

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