IC TXRX RS485/422 5V HS 8-SOIC

 

ISL81487IB-T

Manufacturer Part NumberISL81487IB-T
DescriptionIC TXRX RS485/422 5V HS 8-SOIC
ManufacturerIntersil
TypeTransceiver
ISL81487IB-T datasheets

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Specifications of ISL81487IB-T

Number Of Drivers/receivers1/1ProtocolRS422, RS485
Voltage - Supply4.5 V ~ 5.5 VMounting TypeSurface Mount
Package / Case8-SOIC (3.9mm Width)Lead Free Status / RoHS StatusContains lead / RoHS non-compliant
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Data Sheet
1/8 Unit Load, 5V, Low Power, High Speed
or Slew Rate Limited, RS-485/RS-422
Transceivers
These Intersil RS-485/RS-422 devices are “fractional” unit
load (UL), 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 ISL81483 and ISL81487 present a 1/8 unit load to the
RS-485 bus, which allows up to 256 transceivers on the
network for large node count systems (e.g., process
automation, remote meter reading systems). The 1/4 UL
ISL8487 allows up to 128 transceivers on the bus. In a
remote utility meter reading system, individual (apartments
for example) utility meter readings are routed to a
concentrator via an RS-485 network, so the high allowed
node count minimizes the number of repeaters required to
network all the meters. Data for all meters is then read out
from the concentrator via a single access port, or a wireless
link.
Slew rate limited drivers on the ISL8487 and ISL81483
reduce EMI, and minimize reflections from improperly
terminated transmission lines, or unterminated stubs in
multidrop and multipoint applications. Data rates up to
250kbps are achievable with these devices.
Data rates up to 5Mbps are achievable by using the
ISL81487, 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.
These half duplex devices 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
ISL8487
Half
128
ISL81483
Half
256
ISL81487
Half
256
1
ISL8487, ISL81483, ISL81487
July 31, 2006
Features
• Fractional Unit Load Allows up to 256 Devices on the Bus
• Specified for 10% Tolerance Supplies
• Class 3 ESD Protection (HBM) on all Pins. . . . . . . . >7kV
• High Data Rate Version (ISL81487) . . . . . . . up to 5Mbps
• Slew Rate Limited Versions for Error Free Data
Transmission (ISL8487, ISL81483) . . . . . . .up to 250kbps
• Low Current Shutdown Mode (Except ISL81487) . . 0.5
• Low Quiescent Supply Current:
- ISL8487, ISL81483. . . . . . . . . . . . . . . . . . 145
- ISL81487 . . . . . . . . . . . . . . . . . . . . . . . . . 420
• -7V to +12V Common Mode Input Voltage Range
• Three State Rx and Tx Outputs
• 30ns Propagation Delays, 5ns Skew (ISL81487)
• Half Duplex Pinouts
• Operate from a Single +5V Supply (10% Tolerance)
• Current Limiting and Thermal Shutdown for Driver
Overload Protection
• Drop-In Replacements for: MAX487 (ISL8487); MAX1483
(ISL81483); MAX1487, LMS1487 (ISL81487)
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• High Node Count Networks
• Automated Utility Meter Reading Systems
• Factory Automation
• Security Networks
• Building Environmental Control Systems
• Industrial/Process Control Networks
TABLE 1. SUMMARY OF FEATURES
DATA RATE
SLEW-RATE
RECEIVER/
(Mbps)
LIMITED?
DRIVER ENABLE?
0.25
Yes
Yes
0.25
Yes
Yes
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. 2004, 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
FN6050.7
μ
A
μ
A (Max.)
μ
A (Max.)
QUIESCENT
LOW POWER
PIN
I
(μA)
SHUTDOWN?
COUNT
CC
120
Yes
8
120
Yes
8
350
No
8

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ISL81487IB-T 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. 2004, 2006. All Rights Reserved All other trademarks mentioned are the property of their respective owners. ...

  • Page 2

    ... ISL81483IP ISL81483IP ISL81483IPZ (Note) 81483IPZ ISL81487IB 81487IB ISL81487IBZ (Note) 81487IBZ ISL81487IP ISL81487IP ISL81487IPZ (Note) 81487IPZ *SOIC also available in Tape and Reel; Add “-T” to suffix. **Pb-free PDIPs can be used for through hole wave solder processing only. They are not intended for use in Reflow solder processing applications. ...

  • Page 3

    Pin Descriptions PIN RO Receiver output > least 0.2V high < 0.2V or more low High if A and B are unconnected (floating). RE Receiver ...

  • Page 4

    Absolute Maximum Ratings V to Ground ...

  • Page 5

    Electrical Specifications Test Conditions: V (Note 2) (Continued) PARAMETER SYMBOL Receiver Input Resistance R No-Load Supply Current, (Note 3) I Shutdown Supply Current I SHDN Driver Short-Circuit Current, I OSD1 V = High or Low O Receiver Short-Circuit Current I ...

  • Page 6

    Electrical Specifications Test Conditions: V (Note 2) (Continued) PARAMETER SYMBOL Driver Enable from Shutdown to t ZH(SHDN) Output High Driver Enable from Shutdown to t ZL(SHDN) Output Low Receiver Enable from Shutdown to t ZH(SHDN) Output High Receiver Enable from ...

  • Page 7

    Test Circuits and Waveforms SIGNAL GENERATOR FIGURE 2A. TEST CIRCUIT FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES SIGNAL Y GENERATOR C L (SHDN) for ISL8487 and ...

  • Page 8

    Test Circuits and Waveforms SIGNAL A GENERATOR (SHDN) for ISL8487 and ISL81483 only. PARAMETER (Note (Note (Note 7) 0 ZH(SHDN) ...

  • Page 9

    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 ...

  • Page 10

    Typical Performance Curves 160 140 120 LOW 100 -20 -40 -60 ISL81487E -80 ISL8487E, ISL81487L -100 -120 - OUTPUT VOLTAGE (V) FIGURE 8. DRIVER OUTPUT ...

  • Page 11

    Typical Performance Curves R DIFF B A TIME (400ns/DIV) FIGURE 14. DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH (ISL8487, ISL81483) R DIFF B A/Y ...

  • Page 12

    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: INCH. In case of conflict between ...

  • Page 13

    ... 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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