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 Human Body Model (HBM)
    ■ ±8kV IEC 61000-4-2 (Contact)
• 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