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74137: 3-line to 8-line decoder, latched input

  • 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. The 3-bit input is loaded in a D-type latch.

Inputs and outputs

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

Function table

LE OE1 OE2 A2 A1 A0 Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0
X X H X X X H H H H H H H H
X L X X X X H H H H H H H H
L H L L L L H H H H H H H L
L H L L L H H H H H H H L H
L H L L H L H H H H H L H H
L H L L H H H H H H L H H H
L H L H L L H H H L H H H H
L H L H L H H H L H H H H H
L H L H H L H L H H H H H H
L H L H H H L H H H H H H H
H H L X X X y7 y6 y5 y4 y3 y2 y1 y0
  • H: HIGH voltage level
  • L: LOW voltage level
  • X: don't care
  • yn: previous state of output Yn

Pin layout

Datasheets