SP339 RS-232/RS-485/RS-422 Transceiver with Internal Termination

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. The RS-485/422 modes feature one driver and one receiver (1TX/1RX) in both half and full duplex configurations. The RS-232 mode (3TX/5RX) provides full support of all eight signals commonly used with the DB9 RS-232 connector. A dedicated diagnostic loopback mode is also provided. The high speed drivers operate up to 20Mbps in RS-485/422 modes, and up to 1Mbps in RS-232 mode. All drivers can be slew limited to 250kbps in any mode to minimize electromagnetic interference (EMI). All transmitter outputs and receiver inputs feature robust electrostatic discharge (ESD) protection to ±15kV Human Body Model (HBM) and ±8kV IEC-61000-4-2 Contact. Each receiver output has full fail-safe protection to avoid system lockup, oscillation, or indeterminate states by defaulting to logic-high output level when the inputs are open, shorted, or terminated but undriven. No external biasing resistors are required.

技术特性

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

订购信息 Ordering Information

器件型号	有害物质限制	最低温度	最高温度	状态	立刻购买	申请样片
SP338EER1-0A-EB				Active
SP339ECR1-L		0	70	Active
SP339ECR1-L/TR		0	70	Active
SP339EER1-L		-40	85	Active
SP339EER1-L/TR		-40	85	Active

技术指标

发送器数量(Tx)	3/1
接收器数量(Rx)	5/1
数据传输速率(kbps)	256/1M/20M
电源电压Vcc(V)	3.3 or 5
Typ.集成元件电路(mA)	2
静电放电ESD(KV)	15
终止	Complete
支持协议	RS-232, V.28, RS-485, RS-422, V.24

应用领域 APPLICATION

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

功能框图 Functional Block Diagram

应用技术支持与电子电路设计开发资源下载	版本信息	大小
SP339 数据资料DataSheet下载:pdf	Rev.V2	2 页