SP331

® SP331 Programmable RS-232/RS-485 Transceiver s +5V Only Operation s Software Programmable RS-232 or RS-485 Selection s Four RS-232 Transceivers in RS-232 Mode s Two RS-485 Full-Duplex Transceivers in RS-485 Mode s Two RS-232 Transceivers and One RS-485 Transceiver in Dual Mode s Self-Testing Loopback Mode s Full Driver Tri-State (Hi-Z) Control s Ideal for RS-232 to RS-485 conversion DESCRIPTION… The SP331 is a programmable RS-232 and/or RS-485 transceiver IC. The SP331 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 transceivers can typically operate at 230kbps while adhering to the RS-232 specifications. The RS-485 transceivers 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. TI4 SEL_B TX4 TX3 VCC TX1 TX2 GND C1+ V+ (VDD) C2+ C1– C2– V– (VSS) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 TI3 TI2 TI1 SEL_C SEL_A SEL_D RX4 RX3 RX2 RX1 RI4 RI3 RI2 RI1 SP331 SP331DS/13 SP331 RS-232/RS-485 Serial...