SP332

® SP332 RS-232/RS-485 Multi-Mode Serial Transceiver s s s s s +5V-Only Single Supply Operation 4 Drivers, 4 Receivers RS-232 2 Drivers, 2 Receivers RS-485 Loop Back Function for Self Test 28 Pin SOIC Packaging DESCRIPTION… The SP332 is a monolithic device that contains both RS-232 and RS-485 line drivers and receivers. The configuration of the SP332 can be changed at any time by changing the logic state of two control input pins. The device also includes a loop back function which internally connects driver outputs to receiver inputs for a chip self test. A Sipex-patented charge pump (5,306,954) allows +5V-only operation. RS-232 Mode 9 0.1µF 0.1µF 0V 0V C1+ 12 C111 C2+ 13 C224 SEL A 2 SEL B 26 TI1 Vcc 400KΩ +5V 5 VCC Full Duplex RS-485 +5V 5 V+ V10 14 0.1µF LOOP 23 BACK TTL/CMOS 0.1µF 9 0.1µF 0.1µF +5V TTL/CMOS +5V TTL/CMOS 12 C1+ C1- VCC SP332 Vcc 400KΩ TTL/CMOS T1 TX1 6 RS-232 11 C2+ 13 C224 SEL A 2 SEL B Vcc SP332 V+ V- 10 14 0.1µF 23 0.1µF LOOP BACK TTL/CMOS TX2 7 T1 TX1 6 TTL/CMOS TTL/CMOS 27 TI2 Vcc 400KΩ T2 T3 TX2 7 TX3 4 RS-232 TTL/CMOS TTL/CMOS TTL/CMOS 26 TI1 27 TI2 28 TI3 1 TI4 Vcc RS-485/RS-232 RS-485/RS-232 RS-485/RS-232 RS-485/RS-232 RS-485/RS-232 RS-485/RS-232 RS-485/RS-232 RS-485/RS-232 28 TI3 Vcc 400KΩ RS-232 TX4 3 T3 TX3 4 RI2 16 R1 RI1 15 RI4 18 TTL/CMOS 1 TI4 T4 TX4 3 RS-232 TTL/CMOS TTL/CMOS 19 RX1 20 RX2 21 RX3 R1 RI1 15 5KΩ RS-232 TTL/CMOS TTL/CMOS 19 RX1 20 RX2 TTL/CMOS TTL/CMOS R2 5KΩ RI2 16 RI3 17 5KΩ RS...