Low power RS-485/RS-422 transceiver - STMicroelectronics
Description
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ST485ER
±15KV ESD protected, Low power RS-485/RS-422 transceiver
General features
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Low quiescent current: 300µA Designed for RS-485 interface application -7V to 12V common mode input voltage range Driver maintains high impedance in 3-state or with the power OFF 70mV tipycal input hysteresis 30ns propagation delay, 5ns skew Operate from a single 5V supply Current limiting and thermal shutdown for driver overload protection ESD protection: – ±15KV (H.
B.
M.
) – ±8KV (IEC-1000-4-2 contact discharge) Allows up to 256 transceivers on the bus latchup.
These parts contain one driver and one receiver.
This transceiver draws 300µA (typ.
) of supply current when unloaded or fully loaded with disabled drivers.
It operates from a single 5V supply.
Driver is short-circuit current limited and is protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state.
The ST485E is designed for bi-directional data communications on multipoint bus transmission line (half-duplex applciations).
DIP-8 SO-8
■
Description
The ST485E is al low power transceiver for RS485 and RS-422 communication.
Each driver output and receiver input is protected against ±15KV electrostatic discharge (H.
B.
M.
) ±8KV (IEC-1000-4-2 contact discharge) shocks, without
Order code
Part number ST485ERBN ST485ERBDR October 2006 Temperature range -40 to 85 °C -40 to 85 °C Package DIP-8 SO-8 (Tape & reel) Rev 5 Packaging 50parts per tube / 40tube per box 2500 parts per reel 1/19
www.
st.
com
19
Contents
ST485ER
Contents
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1 Pin description .
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Truth tables .
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4 Maximum ratings .
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