RS-485/RS-422 transceiver. ST485ER Datasheet

ST485ER transceiver. Datasheet pdf. Equivalent

Part ST485ER
Description Low power RS-485/RS-422 transceiver
Feature www.DataSheet4U.com ST485ER ±15KV ESD protected, Low power RS-485/RS-422 transceiver General featur.
Manufacture STMicroelectronics
Total Page 19 Pages
Datasheet
Download ST485ER Datasheet



ST485ER
www.DataSheet4U.com
ST485ER
±15KV ESD protected, Low power
RS-485/RS-422 transceiver
General features
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
Description
The ST485E is al low power transceiver for RS-
485 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
DIP-8
SO-8
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).
Order code
Part number Temperature range
ST485ERBN
ST485ERBDR
-40 to 85 °C
-40 to 85 °C
October 2006
Package
DIP-8
SO-8 (Tape & reel)
Rev 5
Packaging
50parts per tube / 40tube per box
2500 parts per reel
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ST485ER
Contents
Contents
ST485ER
1 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1 DC Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.2 Driver switching characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.3 Receiver switching characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Test circuit and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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