SP331ET-L (EXAR)

The SP331ET-L is a Programmable RS-232 and RS-485 Transceiver IC contains four drivers and four receivers when selected in RS-232 mode and two drivers and two receivers when selected in RS-485 mode. The SP331 also contains a dual mode which has two RS-232 drivers/receivers plus one differential RS-485 driver/receiver. The RS-232 transceiver can typically operate at 230kbps while adhering to the RS-232 specifications. The RS-485 transceiver can operate up to 10Mbps while adhering to the RS-485 specifications. The SP331 includes a self-test loopback mode where the driver outputs are internally configured to the receiver inputs. This allows for easy diagnostic serial port testing without using an external loopback plug. The RS-232 and RS-485 drivers can be disabled (high-Z output) by controlling a set of four select pins.