MC74HCT157A中文资料摩托罗拉数据手册PDF规格书

Quad 2-Input Data Selector/Multiplexer with LSTTL-Compatible Inputs

High–Performance Silicon–Gate CMOS

The MC74HCT157A is identical in pinout to the LS157. This device may be used as a level converter for interfacing TTL or NMOS outputs to High Speed CMOS inputs.

This device routes 2 nibbles (A or B) to a single port (Y) as determined by the Select input. The data is presented at the outputs in noninverted form. A high level on the Output Enable input sets all four Y outputs to a low level.

The HCT157A is similar in function to the HC257 which has 3–state outputs.

• Output Drive Capability: 10 LSTTL Loads

• TTL NMOS Compatible Input Levels

• Outputs Directly Interface to CMOS, NMOS and TTL

• Operating Voltage Range: 4.5 to 5.5 V

• Low Input Current: 1.0 µA

• In Compliance with the Requirements Defined by JEDEC Standard No. 7A

• Chip Complexity: 102 FETs or 25.5 Equivalent Gates