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74138: 3-line to 8-line decoder

  • Type: decoder
  • DIP: 16-pin
  • Input: 3-bit
  • Output: 8 lines

Description

This chip provides an 3-bit to eight line decoder with active low output.

Inputs and outputs

Label Description Signal
An encoded input active high
Yn output active low
OE1 output enable input 1 active low
OE2 output enable input 2 active low
OE3 output enable input 3 active high

Function table

OE1 OE2 OE3 A2 A1 A0 Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0
H X X X X X H H H H H H H H
X H X X X X H H H H H H H H
X X L X X X H H H H H H H H
L L H L L L H H H H H H H L
L L H L L H H H H H H H L H
L L H L H L H H H H H L H H
L L H L H H H H H H L H H H
L L H H L L H H H L H H H H
L L H H L H H H L H H H H H
L L H H H L H L H H H H H H
L L H H H H L H H H H H H H
  • H: HIGH voltage level
  • L: LOW voltage level
  • X: don't care

Pin layout

Datasheets