MC145406

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC145406/D MC145406 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 E I A 2 3 2 – E a n d C C I T T V. 2 8 . T h e d r i v e r s f e a t u r e t r u e T T L i n p u t 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 P SUFFIX PLASTIC CASE 648 16 1 16 1 DW SUFFIX SOG CASE 751G SD SUFFIX SSOP CASE 940B BLOCK DIAGRAM VDD RECEIVER VDD VCC 15 kΩ + – VSS 1.0 V Tx2 1.8 V HYSTERESIS VDD Tx3 DRIVER VCC 300 Ω Tx LEVEL SHIFT + – 1.4 V DI VSS Rx3 DO Rx2 VCC Tx1 VDD Rx1 PIN ASSIGNMENT 1 2 3 4 5 6 7 R D R D R D 16 15 14 13 12 11 10 VCC DO1 DI1 DO2 DI2 DO3 DI3 GND * Rx 5.4 k 8 9 D = DRIVER R = RECEIVER VSS *Protection c...