The MC145406 is a silicongate 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, slewratelimited output, 300 p oweroff 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 k i mpedance. Hysteresis in the receivers aids reception of noisy signals. By combining both drivers and receivers in a single CMOS chip, the MC145406 provides efficient, lowpower solutions for EIA 232E and V.28 applications.