STMicroelectronics ST485ECDR Linear IC ST485ECDR Data Sheet

February 2009

Rev 14

1/18

18

±15 kV ESD protected, low power

RS-485/RS-422 transceiver

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Low quiescent current: 300 µA

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Designed for RS-485 interface application

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- 7 V to 12 V common mode input voltage range

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Driver maintains high impedance in 3-state or 
with the power OFF

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70 mV typical input hysteresis

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30 ns propagation delay, 5 ns skew

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Operates from a single 5 V supply

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Current limiting and thermal shutdown for 
driver overload protection

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ESD protection:

– ± 15 kV (HBM)

– ± 8 kV (IEC-1000-4-2 contact discharge)

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Allows up to 256 transceivers on the bus

The ST485E is a low power transceiver for RS-
485 and RS-422 communication. Each driver 
output and receiver input is protected against 
± 15 kV electrostatic discharge (HBM) (ESD) 
shocks, without latch-up. These parts contain one 
driver and one receiver in half duplex 
configuration.

This transceiver draws 300 µA (typ.) of supply 
current when unloaded or fully loaded with 
disabled drivers.

It operates from a single 5 V supply.

Driver is short-circuit current limited and is 
protected against excessive power dissipation by 
thermal shutdown circuitry that place the driver 
outputs into a high-impedance state.

The ST485E is designed for bi-directional data 
communications on multipoint bus transmission 
lines (half-duplex applications).

ST485EBD

- 40 to 85 °C

SO-8 (tube)

100 parts per tube / 20 tube per box

ST485ECDR

0 to 70 °C

SO-8 (tape and reel)

2500 parts per reel

ST485EBDR

- 40 to 85 °C

SO-8 (tape and reel)

2500 parts per reel

ST485EXDR

- 55 to 125 °C

SO-8 (tape and reel)

2500 parts per reel