ST485B Datasheet, PDF (1/19 Pages) STMicroelectronics – Low power RS-485/RS-422 transceiver

ST485B
ST485C
Low power RS-485/RS-422 transceiver
Features
■ Low quiescent current: 300 µA
■ Designed for RS-485 interface application
■ -7 V to 12 V common mode input voltage range
■ Driver maintains high impedance in 3-state or
with the power OFF
■ 70 mV typical input hysteresis
■ 30 ns propagation delay, 5 ns skew
■ Operate from a single 5 V supply
■ Current limiting and thermal shutdown for
driver overload protection
■ Allows up to 64 transceivers on the bus
Description
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).
DIP-8
SO-8
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).
Table 1. Device summary
Order code Temperature range
ST485CN
0 to 70 °C
ST485BN
-40 to 85 °C
ST485CDR
0 to 70 °C
ST485BDR
-40 to 85 °C
Package
DIP-8
DIP-8
SO-8 (tape and reel)
SO-8 (tape and reel)
Packaging
50 parts per tube / 40 tube per box
50 parts per tube / 40 tube per box
2500 parts per reel
2500 parts per reel
February 2008
Rev 15
1/19
www.st.com
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