STMicroelectronics ST485CDR Linear IC ST485CDR Data Sheet

February 2009

Rev 16

1/19

19

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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Operate from a single 5 V supply

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Current limiting and thermal shutdown for 
driver overload protection

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Allows up to 64 transceivers on the bus

The ST485 is al low power transceiver for RS-485 
and RS-422 communication. Each part contains 
one driver and one receiver.

This transceiver draw 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 placed the driver 
outputs into a high-impedance state.

The ST485 is designed for bi-directional data 
communications on multipoint bus transmission 
line (half-duplex applications).

The ST485 is available in three temperature 
range: commercial (0 °C to 70 °C), industrial (- 40 
°C to 85 °C) and automotive (- 55 °C to 125 °C).

  

ST485CN

0 to 70 °C

DIP-8

50 parts per tube / 40 tube per box

ST485BN

- 40 to 85 °C

DIP-8

50 parts per tube / 40 tube per box

ST485CDR

0 to 70 °C

SO-8 (tape and reel)

2500 parts per reel

ST485BDR

- 40 to 85 °C

SO-8 (tape and reel)

2500 parts per reel