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74F257A Datasheet(PDF) 3 Page - NXP Semiconductors

Part No. 74F257A
Description  Quad 2-line to 1-line selector/multiplexer, non-inverting 3-State
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74F257A Datasheet(HTML) 3 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
74F257A
Quad 2-line to 1-line selector/multiplexer, non-inverting
(3-State)
1995 Mar 31
3
LOGIC DIAGRAM
I0a
I1a
I0b
I1b
I0c
I1c
I0d
I1d
OE
S
2
3
5
6
11
10
14
13
15
1
479
12
Ya
Yb
Yc
Yd
VCC = Pin 16
GND = Pin 8
SF00676
FUNCTION TABLE
INPUTS
OUTPUT
OE
S
I0
I1
Y
H
X
X
X
Z
L
H
X
L
L
L
H
X
H
H
L
L
L
X
L
L
L
H
X
H
H
=
High voltage level
L
=
Low voltage level
X
=
Don’t care
Z
=
High impedance “off” state
APPLICATION
SF00677
I0a I1a I0b I1b I0c I1c I0d I1d
Ya
Yb
Yc
Yd
I0a I1a I0b I1b I0c I1c I0d I1d
Ya
Yb
Yc
Yd
I0a I1a I0b I1b I0c I1c I0d I1d
Ya
Yb
Yc
Yd
I0a I1a I0b I1b I0c I1c I0d I1d
Ya
Yb
Yc
Yd
74F257A
74F257A
74F257A
74F257A
4-BIT
DATA
BUS
OE
S
OE
S
OE
S
OE
S
WORD A
WORD B
WORD C
WORD D
WORD E
WORD F
WORD G
WORD H
Y0
Y1
Y2
Y3
74F139
C
B
A
S2
S1
S0
ENABLE


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