RS-422中文资料艾科嘉数据手册PDF规格书

GENERAL DESCRIPTION

The SP339 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

● Space saving 6mm x 6mm QFN-40 Package

● Pin compatible with SP338E

TYPICAL APPLICATIONS

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

● Industrial Computers

● Industrial and Process Control Equipment

● Point-Of-Sale Equipment

● Networking Equipment

● HVAC Controls Equipment

● Building Security and Automation Equipment