DESCRIPTION

       The AT339 is an advanced multiprotocol transceiver supporting RS-232, RS-485, and RS-422 serial standards in a 40 pin QFN package. Integrated cable termination and four configuration modes allow all three protocols to be used interchangeably over a single cable or connector with no additional switching components. Full operation requires only four external charge pump capacitors.

FEATURES

Pin selectable Cable Termination

No external resistors required for RS-485/422 termination and biasing

3.3V or 5V Single Supply Operation

Robust ESD Protection on bus pins

±15kV IEC 61000-4-2 (Air Gap)

± 8kV IEC 61000-4-2 (Contact)

±15kV Human Body Model (HBM)

Max Data Rate of 20Mbps in RS-485/422 Modes and up to 1Mbps in RS-232 Modes

Pin selectable 250kbps Slew Limiting

3 Drivers, 5 Receivers RS-232/V.28

1 Driver, 1 Receiver RS-485/422

Full and Half Duplex Configuration

1/8th Unit Load, up to 256 receivers on bus

RS-485/422 Enhanced Failsafe for open, shorted, or terminated but idle inputs

ATace saving 6mm x 6mm QFN-40 Package

Pin compatible with AT338E

TYPICAL APPLICATIONS

Dual Protocol Serial Ports (RS-232 or RS-485/422)

Industrial Computers

ndustrial and Process Control Equipment

Point-Of-Sale Equipment

Networking Equipment

HVAC Controls Equipment

Building Security and Automation Equipment