Description:

The ST485E is a low power transceiver for RS485 and RS-422 communication. Each driveroutput and receiver input is protected against± 15 kV electrostatic discharge (HBM) (ESD)shocks, without latch-up. These parts contain onedriver and one receiver in half duplexconfiguration.This transceiver draws 300 µA (typ.) of supplycurrent when unloaded or fully loaded withdisabled drivers.It operates from a single 5 V supply.Driver is short-circuit current limited and isprotected against excessive power dissipation bythermal shutdown circuitry that place the driveroutputs into a high-impedance state.The ST485E is designed for bi-directional datacommunications on multipoint bus transmissionlines (half-duplex applications).

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 orwith 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 fordriver overload protection

■ ESD protection:

– ± 15 kV (HBM)

– ± 8 kV (IEC-1000-4-2 contact discharge)

■ Allows up to 256 transceivers on the bus