SP338E RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION FEBRUARY 2018 REV. 1.0.1 FEATURES GENERAL DESCRIPTION Pin selectable Cable Termination The SP338 is an advanced multiprotocol transceiver supporting RS-232, RS-485, and RS-422 serial No external resistors required for RS-485/422 standards in a 40 pin QFN package. Integrated cable termination and biasing termination and four configuration modes allow all 3.3V or 5V Single Supply Operation three protocols to be used interchangeably over a single cable or connector with no additional switching Robust ESD Protection on bus pins components. Full operation requires only four 15kV Human Body Model (HBM) external charge pump capacitors. 8kV IEC 61000-4-2 (Contact) The RS-485/422 modes feature up to two drivers and Max Data Rate of 20Mbps in RS-485/422 Modes four receivers (2TX/4RX) in half, full, and mixed and up to 1Mbps in RS-232 Modes duplex configurations. The RS-232 mode (3TX/5RX) provides full support of all eight signals commonly Pin selectable 250kbps Slew Limiting used with the DB9 RS-232 connector. A dedicated 3 Drivers, 5 Receivers RS-232/V.28 diagnostic loopback mode is also provided. 2 Drivers, 4 Receivers RS-485/422 The high speed drivers operate up to 20Mbps in RS- 485/422 modes, and up to 1Mbps in RS-232 mode. Full, Half, and Mixed Duplex Configurations All drivers can be slew limited to 250kbps in any 1/8th Unit Load, up to 256 receivers on bus mode to minimize electromagnetic interference (EMI). RS-485/422 Enhanced Failsafe for open, shorted, All transmitter outputs and receiver inputs feature or terminated but idle inputs robust electrostatic discharge (ESD) protection to 15kV Human Body Model (HBM) and 8kV IEC- Space saving 6mm x 6mm QFN-40 Package 61000-4-2 Contact. Each receiver output has full fail- Pin compatible with SP339E 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. TYPICAL APPLICATIONS The RS-232 receiver inputs include a 5k pull-down Dual Protocol Serial Ports (RS-232 or RS-485/422) to ground. The RS-485/422 receiver inputs are high Industrial Computers impedance (>96k when termination is disabled), allowing up to 256 devices on a single Industrial and Process Control Equipment communication bus (1/8th unit load). Point-Of-Sale Equipment The SP338 operates from a single power supply, Networking Equipment either 3.3V or 5V, with low idle current. The shutdown mode consumes less than 10A for low power HVAC Controls Equipment standby operation. Building Security and Automation Equipment (1) ORDERING INFORMATION PART NUMBER OPERATING TEMPERATURE RANGE LEAD-FREE PACKAGE PACKAGING METHOD SP338EER1-L Tray (2) -40C to +85C 40-pin QFN Yes SP338EER1-L/TR Tape and Reel NOTE: 1. Refer to www.exar.com/SP338E for most up-to-date Ordering Information. 2. Visit www.exar.com for additional information on Environmental Rating. 1SP338E RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION REV. 1.0.1 ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections to the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability and cause permanent damage to the device. Supply Voltage V -0.3V to +6.0V CC Receiver Input Voltage (from Ground) 18V Driver Output Voltage (from Ground) 18V Short Circuit Duration, TX out to Ground Continuous -0.3V to (V + 0.5V) Voltage at TTL Input Pins CC Storage Temperature Range -65C to +150C Lead Temperature (soldering, 10s) +300C Power Dissipation 40-pin QFN 500mW (derate 17mW/C above +70C) ESD Ratings HBM - Human Body Model (Tx Output & Rx Input pins, R1-R9) 15kV HBM - Human Body Model (All other pins) 2kV IEC61000-4-2 Contact Discharge (Tx Output & Rx Input pins, R1-R9) 8kV CAUTION: ESD (ElectroStatic Discharge) sensitive device. Permanent damage may occur on unconnected devices subject to high energy electrostatic fields. Unused devices must be stored in conductive foam or shunts. Personnel should be properly grounded prior to handling this device. The protective foam should be discharged to the destination socket before devices are removed. 2