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74HC251D Datasheet(Hoja de datos) 4 Page - NXP Semiconductors

No. de Pieza. 74HC251D
Descripción  8-input multiplexer; 3-state
Descarga  7 Pages
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Fabricante  PHILIPS [NXP Semiconductors]
Página de inicio  http://www.nxp.com
Logo 

   
 4 page
background image
December 1990
4
Philips Semiconductors
Product specification
8-input multiplexer; 3-state
74HC/HCT251
FUNCTION TABLE
Note
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
Z = high impedance OFF-state
INPUTS
OUTPUTS
OE
S2
S1
S0
I0
I1
I2
I3
I4
I5
I6
I7
YY
H
XXXXXXXXXXX
Z
Z
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
H
L
H
X
X
X
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
H
L
H
L
L
H
L
H
L
L
L
L
L
L
L
L
H
H
H
H
L
L
H
H
X
X
X
X
X
X
X
X
L
H
X
X
X
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
H
L
H
L
L
H
L
H
L
L
L
L
H
H
H
H
L
L
L
L
L
L
H
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
L
H
X
X
X
X
X
X
X
X
H
L
H
L
L
H
L
H
L
L
L
L
H
H
H
H
H
H
H
H
L
L
H
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
L
H
H
L
H
L
L
H
L
H
Fig.4 Functional diagram.
Fig.5 Logic diagram.




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