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.
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