ISL31485E中文資料Fault Protected, Extended CMR, RS-485/RS-422 Transceivers with Cable Invert數(shù)據(jù)手冊Renesas規(guī)格書

描述 Description

The ISL31483E and ISL31485E are fault protected, 5V powered differential transceivers that exceed the RS-485 and RS-422 standards for balanced communication. The RS-485 transceiver pins (driver outputs and receiver inputs) are fault protected up to ±60V. Additionally, the extended common mode range allows these transceivers to operate in environments with common mode voltages up to ±25V (>2x the RS-485 requirement), making this fault protected RS-485 family one of the most robust on the market.
Transmitters deliver an exceptional 2.5V (typical) differential output voltage into the RS-485 specified 54Ω load. This yields better noise immunity than standard RS-485 ICs, or allows up to six 120Ω terminations in star network topologies.
Receiver (Rx) inputs feature a “Full Fail-Safe” design, which ensures a logic high Rx output if Rx inputs are floating, shorted, or on a terminated but undriven (idle) bus.
The ISL31483E and ISL31485E include cable invert functions that reverse the polarity of the Rx and/or Tx bus pins in case the cable is misconnected. Unlike competing devices, Rx full fail-safe operation is maintained even when the Rx input polarity is switched.

特性 Features

? Fault protected RS-485 bus pins:up to ±60V
? Extended common mode range: ±25V More than twice the range required for RS-485
? Cable invert pins corrects for reversed cable connections while maintaining Rx full fail-safe functionality
? Full fail-safe (open, short, terminated) RS-485 receivers
? 1/4 unit load (UL) for up to 128 devices on the bus
? High Rx IOL for opto-couplers in isolated designs
? Hot plug circuitry - Tx and Rx outputs remain three-state during power-up/power-down
? Slew rate limited RS-485 data rate: 1Mbps
? Low quiescent supply current: 2.3mA
? Ultra low shutdown supply current: 10μA

應(yīng)用 Application

? Utility meters/automated meter reading systems
? High node count RS-485 systems
? PROFIBUS? and RS-485 based field bus networks and factory automation
? Security camera networks
? Building lighting and environmental control systems
? Industrial/process control networks