74LS42 Просмотр технического описания (PDF) - ON Semiconductor

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74LS42

One-of-Ten Decoder

ON Semiconductor 

SN74LS42

FUNCTIONAL DESCRIPTION

The LS42 decoder accepts four active HIGH BCD inputs

and provides ten mutually exclusive active LOW outputs, as

shown by logic symbol or diagram. The active LOW outputs

facilitate addressing other MSI units with LOW input

enables.

The logic design of the LS42 ensures that all outputs

are HIGH when binary codes greater than nine are applied

to the inputs.

The most significant input A3 produces a useful inhibit

function when the LS42 is used as a one-of-eight decoder.

The A3 input can also be used as the Data input in an 8-output

demultiplexer application.

TRUTH TABLE

A0 A1 A2 A3 0 1 2 3 4 5 6 7 8 9

L L L L LHHHHHHHHH

H L L L HLHHHHHHHH

L H L L HHLHHHHHHH

H H L L HHHLHHHHHH

L L H L HHHHLHHHHH

H L H L HHHHHLHHHH

L H H L HHHHHHLHHH

H H H L HHHHHHHLHH

L L L H HHHHHHHHLH

H L L H HHHHHHHHHL

L H L H HHHHHHHHHH

H H L H HHHHHHHHHH

L L H H HHHHHHHHHH

H L H H HHHHHHHHHH

L H H H HHHHHHHHHH

H H H H HHHHHHHHHH

H = HIGH Voltage Level

L = LOW Voltage Level

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