145406

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC145406/D Driver/Receiver EIA 232–E and CCITT V.28 (Formerly RS–232–D) The MC145406 is a silicon–gate CMOS IC that combines three drivers and three receivers to fulfill the electrical specifications of standards EIA 232–E and CCITT V.28. The drivers feature true TTL input compatibility, slew–rate–limited output, 300–Ω power–off source impedance, and output typically switching to within 25% of the supply rails. The receivers can handle up to ± 25 V while presenting 3 to 7 kΩ impedance. Hysteresis in the receivers aids reception of noisy signals. By combining both drivers and receivers in a single CMOS chip, the MC145406 provides efficient, low–power solutions for EIA 232–E and V.28 applications. Drivers ± 5 V to ±12 V Supply Range 300–Ω Power–Off Source Impedance Output Current Limiting TTL Compatible Maximum Slew Rate = 30 V/µs Receivers ± 25 V Input Voltage Range When VDD = 12 V, VSS = – 12 V 3 to 7 kΩ Input Impedance Hysteresis on Input Switchpoint MC145406 16 1 16 1 P SUFFIX PLASTIC CASE 648 DW SUFFIX SOG CASE 751G SD SUFFIX SSOP CASE 940B BLOCK DIAGRAM VDD RECEIVER VDD * 15 kΩ Rx VCC + – 5.4 k VSS VCC 1.0 V DO 1.8 V HYSTERESIS VDD DRIVER VCC 300 Ω Tx LEVEL SHIFT + DI – 1.4 V PIN ASSIGNMENT VDD 1 16 VCC Rx1 2 R 15 DO1 3 Tx1 D 14 DI1 Rx2 4 R 13 DO2 Tx2 5 D 12 DI2 6 Rx3 7 Tx3 R 11 DO3 D 10 DI3 VSS 8 9 GND D = DRIVER R = RECEIVER VSS *Protection circuit M© OMoTt...