74151.md

74151: 8-line multiplexer

• Type: multiplexer
• Number of elements: 1
• Inputs per element: 8
• Outputs per element: 1
• Bits: 1
• DIP: 16-pin

Description

This multiplexer forwards a single input from one of eight sources to the output.

A high voltage on the enable input OE ties the output to low voltage.

Inputs and outputs

Label	Description	Signal
S0	data select input 0	active high
S1	data select input 1	active high
S2	data select input 2	active high
OE	enable input	active low
A	source A input	active high
B	source B input	active high
C	source C input	active high
D	source D input	active high
E	source E input	active high
F	source F input	active high
G	source G input	active high
J	source J input	active high
Y	output	active high
Z	inverted output	active low

Function table

OE	S2	S1	S0	A	B	C	D	E	F	G	J	Y	Z
H	X	X	X	X	X	X	X	X	X	X	X	L	H
L	L	L	L	L	X	X	X	X	X	X	X	L	H
L	L	L	L	H	X	X	X	X	X	X	X	H	L
L	L	L	H	X	L	X	X	X	X	X	X	L	H
L	L	L	H	X	H	X	X	X	X	X	X	H	L
L	L	H	L	X	X	L	X	X	X	X	X	L	H
L	L	H	L	X	X	H	X	X	X	X	X	H	L
L	L	H	H	X	X	X	L	X	X	X	X	L	H
L	L	H	H	X	X	X	H	X	X	X	X	H	L
L	H	L	L	X	X	X	X	L	X	X	X	L	H
L	H	L	L	X	X	X	X	H	X	X	X	H	L
L	H	L	H	X	X	X	X	X	L	X	X	L	H
L	H	L	H	X	X	X	X	X	H	X	X	H	L
L	H	H	L	X	X	X	X	X	X	L	X	L	H
L	H	H	L	X	X	X	X	X	X	H	X	H	L
L	H	H	H	X	X	X	X	X	X	X	L	L	H
L	H	H	H	X	X	X	X	X	X	X	H	H	L

• H: HIGH voltage level
• L: LOW voltage level
• X: don't care

Pin layout

Datasheets

• CD74HC151 by Texas Instruments
• 74HC151, 74HCT151 by Nexperia