SP338E RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
The SP338 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 up to two drivers and four receivers (2TX/4RX) in half, full, and mixed 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.
The RS-232 receiver inputs include a 5kΩ pull-down to ground. The RS-485/422 receiver inputs are high impedance (>96kΩ when termination is disabled), allowing up to 256 devices on a single communication bus (1/8th unit load).
The SP338 operates from a single power supply, either 3.3V or 5V, with low idle current. The shutdown mode consumes less than 10μA for low power standby operation.
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SP338E 、 SP338EER1-L 、 SP338EER1-L/TR 、 SP338ECR1-L 、 SP338ECR1-L/TR 、 RS-232 、 RS-485 、 RS-422 |
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[ Dual Protocol Serial Ports ][ RS-232 ][ RS-485/422 ][ Industrial Computers ][ Industrial ][ Process Control Equipment ][ Point-Of-Sale Equipment ][ Networking Equipment ][ HVAC Controls Equipment ][ Building Security ][ Automation Equipment ] |
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Datasheet |
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Please see the document for details |
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40-pin QFN |
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English Chinese Chinese and English Japanese |
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NOVEMBER 2011 |
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REV. 1.0.0 |
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2.2 MB |
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