DESCRIPTION
The M54/74HCT157 and the M54/74HCT158 are high speed CMOS QUAD 2-CHANNEL MULTIPLEXERs fabricated with silicon gate C2MOS technology. They achieve the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. These devices consist of four 2-input digital multiplexers with common select and strobe inputs. The HCT158 is an inverting multiplexer while the HCT157 is a non-inverting multiplexer. When the STROBE input is held High, selection of data is inhibited and all the outputs become Low in the M74HCT157 and High in the M74HCT158. All inputs are equipped with protection circuits against static discharge and transient excess voltage. M54/74HCT devices are designed to directly interface HSC2MOS systems with TTL and NMOS components. April 1993 HCT157 HCT158 NC = No Internal Connection 1/11 M54/M74HCT157 M54/M74HCT158 CHIP CARRIER HCT157 HCT158 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
(for HCT157) PIN No 1 2, 5, 11, 14 3, 6, 10,...
STMicroelectronics
