DESCRIPTION
The M54/74HC157 and the M54/74HC158 are high speed CMOS QUAD 2-CHANNEL MULTIPLEXER’s 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 HC158 is an inverting multiplexer while the HC157 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 M74HC157 and High in the M74HC158. All inputs are equipped with protection circuits against static discharge and transient excess voltage. February 1993 HC158 NC = No Internal Connection 1/11 M54/M74HC157 M54/M74HC158 CHIP CARRIER HC157 HC158 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
(for HC157) PIN No 1 2, 5, 11, 14 3, 6, 10, 13 4, 7, 9, 12 15 8 16 SYMBOL SELECT 1A to 4A 1B to 4B 1Y to 4Y STROBE GND VCC NAME AND FUNCTION Common Data Sele...
STMicroelectronics
