SP338E Datasheet | Exar

DESCRIPTION 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 ponents. 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 monly used with the DB9 RS-232 connector. A dedicated diagnostic loopback mode is also provided. The high speed drivers operate up to 20Mbps in RS485/422 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 ±15k V Human Body Model (HBM) and ±8k V IEC61000-4-2 Contact. Each receiver output has full failsafe 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 munication 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. 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 - ±15k V Human Body Model (HBM) - ±8k V IEC 61000-4-2 (Contact) - Max Data Rate of 20Mbps in RS-485/422 Modes and up to...