RS-485/RS-422 transceiver - STMicroelectronics
Description
ST485EB ST485EC - ST485EX
±15 kV ESD protected, 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 ■ Operates from a single 5 V supply ■ Current limiting and thermal shutdown for
driver overload protection ■ ESD protection:
– ± 15 kV (HBM) – ± 8 kV (IEC-1000-4-2 contact discharge) ■ Allows up to 256 transceivers on the bus
Description
SO-8
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).
The ST485E is a low power transceiver for RS485 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.
Table 1.
Device summary
Order codes
Temperature range
Package
Packaging
ST485EBD ST485ECDR ST485EBDR ST485EXDR
- 40 to 85 °C 0 to 70 °C
- 40 to 85 °C - 55 to 125 °C
SO-8 (tube) SO-8 (tape and reel) SO-8 (tape and reel) SO-8 (tape and reel)
100 parts per tube / 20 tube per box 2500 parts per reel 2500 parts per reel 2500 parts per reel
February 2009
Rev 14
1/18
www.
st.
com
18
Contents
Contents
ST485EB - ST485EC - ST485EX
1 Pin configuration .
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3 2 Truth tables .
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4 3 M...
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