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ISL81487IBZ PDF预览

ISL81487IBZ

更新时间: 2024-11-04 03:11:07
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英特矽尔 - INTERSIL /
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13页 454K
描述
1/8 Unit Load, 5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers

ISL81487IBZ 数据手册

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ISL8487, ISL81483, ISL81487  
®
Data Sheet  
July 31, 2006  
FN6050.7  
1/8 Unit Load, 5V, Low Power, High Speed  
or Slew Rate Limited, RS-485/RS-422  
Transceivers  
Features  
• Fractional Unit Load Allows up to 256 Devices on the Bus  
• Specified for 10% Tolerance Supplies  
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).  
• 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  
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.  
• Low Current Shutdown Mode (Except ISL81487) . . 0.5μA  
• Low Quiescent Supply Current:  
- ISL8487, ISL81483. . . . . . . . . . . . . . . . . . 145μA (Max.)  
- ISL81487 . . . . . . . . . . . . . . . . . . . . . . . . . 420μA (Max.)  
• -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)  
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.  
• 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)  
Data rates up to 5Mbps are achievable by using the  
ISL81487, which features higher slew rates.  
Applications  
Receiver (Rx) inputs feature a “fail-safe if open” design,  
which ensures a logic high Rx output if Rx inputs are  
floating.  
• High Node Count Networks  
• Automated Utility Meter Reading Systems  
• Factory Automation  
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.  
• Security Networks  
• Building Environmental Control Systems  
• Industrial/Process Control Networks  
These half duplex devices multiplex the Rx inputs and Tx  
outputs to allow transceivers with Rx and Tx disable  
functions in 8 lead packages.  
TABLE 1. SUMMARY OF FEATURES  
PART  
NUMBER  
HALF/FULL  
DUPLEX  
NO. OF DEVICES  
ALLOWED ON BUS  
DATA RATE SLEW-RATE  
RECEIVER/  
DRIVER ENABLE?  
QUIESCENT LOW POWER  
PIN  
(Mbps)  
0.25  
0.25  
5
LIMITED?  
I
(μA) SHUTDOWN? COUNT  
CC  
120  
ISL8487  
ISL81483  
ISL81487  
Half  
Half  
Half  
128  
256  
256  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
No  
8
8
8
Yes  
120  
350  
No  
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.  
1
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.  

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