Features

• ESD protection

– – ±15 kV human body model

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

• Operates from a single 3.3 V supply - no charge pump required

• Interoperable with 5 V logic

• 1 μA low current shutdown mode max.

• Guaranteed 12 Mbps data rate

• -7 to 12 common mode input voltage range

• Half duplex versions available

• Industry standard 75176 pinout

• Current limiting and thermal shutdown for driver overload protection

• Guaranteed high receiver output state for floating, shorted or terminated inputs

with no signal present

• Allows up to 64 transceivers on the bus

Description

The ST1480US is ±15 kV ESD protected, 3.3 V low power transceiver for RS-485

and RS-422 communications. The device contains one driver and one receiver in half

duplex configuration. The ST1480US transmits and receives at a guaranteed data

rate of at least 12 Mbps. All transmitter outputs and receiver inputs are protected

to ±15 kV using human body model. 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 ST1480US input has a true fail-safe feature that guarantees a logic high output if

both inputs are open circuit, shorted together or in the presence of a termination with

no signal on the bus.