ISL32459E

±60V Fault Protected, 3.3V to 5V, ±20V CMR, 20Mbps RS-485 With Cable Invert, ±15kV ESD

Product Status: Mass Production

OVERVIEW

The ISL3245xE are 3.3V to 5V powered, fault protected, extended Common-Mode Range (CMR) differential transceivers for balanced communication. The RS-485 bus pins (driver outputs and receiver inputs) are protected against overvoltages up to ±60V, and against ±15kV ESD strikes. These transceivers operate in environments with common-mode voltages up to ±20V (exceeds the RS-485 requirement), making this RS-485 family one of the most robust on the market.

The transmitters are RS-485 compliant with VCC ≥ 4.5V and deliver a 1.1V differential output voltage into the RS-485 specified 54Ω load even with VCC = 3V. The receiver (Rx) inputs feature a full fail-safe design that ensures a logic-high Rx output if the Rx inputs are floating, shorted, or on a terminated but undriven (idle) bus. The Rx full fail-safe operation is maintained even when the Rx input polarity is switched (cable invert function on ISL32457E and ISL32459E).

The ISL32457E and ISL32459E include a cable invert function that reverses the polarity of the Rx and Tx bus pins in case the cable is misconnected during installation.

KEY FEATURES

  • Fault protected RS-485 bus pins: up to ±60V
  • Extended common-mode range: ±20V larger than required for RS-485
  • ±15kV HBM ESD protection on RS-485 bus pins
  • Wide supply range: 3V to 5.5V
  • Cable invert pin (ISL32457E and ISL32459E only) corrects for reversed cable connections while maintaining Rx full fail-safe functionality
  • 1/4 unit load for up to 128 devices on the bus
  • High transient overvoltage tolerance: ±80V
  • Full fail-safe (open, short, terminated) RS-485 receivers
  • Choice of RS-485 data rates: up to 20Mbps
  • Low quiescent supply current: 2.1mA

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL32459E
Basic Information
生产状态
Mass Production
Tx数量
1
Rx数量
1
故障电压电平
±60 V
共模电压范围
±20 V
总线上允许的设备
128
半/全双工
Half
高ESD保护
Yes
热插拔
No
数据率
20 Mbps
供电电压Vcc (最小值) (V)
3
受限压摆率
No
Tx/Rx启用
Tx Only
供电电流Icc
2.1 mA
SHDN ICC
10 µA
VL引脚
No
资质级别
Standard
供电电压Vcc (最大值) (V)
5.5
供电电压Vcc范围 (V)
3.0 to 5.5
采样
YES
温度范围
-40 to +85

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