74HC257 PDF Datasheet


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Description

This is Quad 2-Input Data Selector/Multiplexer with 3-State Outputs. MOTOROLA SEMICONDUCTOR TECHNICAL DATA Quad 2-Input Data Selector, Multiplexer with 3-State Outputs High Performance Silicon Gate CMOS The MC74HC257 is identical in pinout to the LS257. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LSTTL outputs. This device selects a (4 bit) nibble from either the A or B inputs as determined by the Select input. The nibble is presented at the outputs in noninverted form when the Output Enable pin is at a low level. A high level on the Output Enable pin switches the outputs into the high impedance state. The HC257 is similar in function to the HC157 which do not have 3 state outputs. Output Drive Capability: 15 LSTTL Loads Outputs Directly Interface to CMOS, NMOS, and TTL Operating Voltage Range: 2 to 6 V Low Input Current: 1 A High Noise Immunity Characteristic of CMOS Devices In Compliance with the Requirements Defined by JEDEC Standard No. 7A Chip Complexity: 108 FETs or .