74F257A Philips, 74F257A Datasheet - Page 3

• Manufacturer Part Number: 74F257A
• Description: Quad 2-line to 1-line selector/multiplexer / non-inverting 3-State
• Manufacturer: Philips

Philips Semiconductors
LOGIC DIAGRAM
APPLICATION
1995 Mar 31
Quad 2-line to 1-line selector/multiplexer, non-inverting
(3-State)
V
GND = Pin 8
4-BIT
DATA
BUS
CC
S2
S1
S0
OE
= Pin 16
15
I0a
2
Ya
I1a
OE
S
I0a I1a I0b I1b I0c I1c I0d I1d
4
Ya
3
WORD A
I0b
Yb
5
74F257A
Yb
I1b
7
6
Yc
WORD B
I0c
11
Yd
Yc
I1c
9
10
I0d
14
OE
S
I0a I1a I0b I1b I0c I1c I0d I1d
Yd
I1d
Ya
ENABLE
12
WORD C
13
SF00676
Yb
74F257A
S
1
Yc
C
B
A
WORD D
Y0
Yd
3
74F139
Y1
FUNCTION TABLE
H
L
X
Z
Y2
OE
=
=
=
=
H
L
L
L
L
Y3
OE
S
I0a I1a I0b I1b I0c I1c I0d I1d
Ya
WORD E
High voltage level
Low voltage level
Don’t care
High impedance “off” state
Yb
74F257A
S
X
H
H
L
L
INPUTS
Yc
WORD F
Yd
I0
H
X
X
X
L
OE
S
I0a I1a I0b I1b I0c I1c I0d I1d
Ya
WORD G
I1
X
H
X
X
L
Yb
74F257A
Product specification
74F257A
Yc
WORD H
OUTPUT
SF00677
Y
H
H
Z
L
L
Yd