ISL32459E

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

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

PARAMETRICS

Parameters
ISL32459E
Basic Information
Production Status
Mass Production
# of Tx
1
# of Rx
1
Fault Voltage Level
±60 V
Common Mode Voltage Range
±20 V
Devices Allowed on Bus
128
Half/Full Duplex
Half
High ESD Protection
Yes
Hot Plug
No
Data Rate
20 Mbps
Supply Voltage Vcc (Min) (V)
3
Slew Rate Limited
No
Tx/Rx Enable
Tx Only
Supply Current Icc
2.1 mA
SHDN ICC
10 µA
VL Pin
No
Qualification Level
Standard
Supply Voltage Vcc (Max) (V)
5.5
Supply Voltage Vcc Range (V)
3.0 to 5.5
Can Sample
YES
Temperature Range
-40 to +85

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