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74F257A データシートの表示(PDF) - Philips Electronics

部品番号コンポーネント説明メーカー
74F257A Quad 2-line to 1-line selector/multiplexer, non-inverting (3-State) Philips
Philips Electronics Philips
74F257A Datasheet PDF : 10 Pages
1 2 3 4 5 6 7 8 9 10
Philips Semiconductors
Quad 2-line to 1-line selector/multiplexer, non-inverting
(3-State)
Product specification
74F257A
LOGIC DIAGRAM
OE I0a I1a I0b I1b I0c I1c I0d I1d
S
15
23
56
11 10
14 13
1
FUNCTION TABLE
INPUTS
OE
S
I0
I1
H
X
X
X
L
H
X
L
L
H
X
H
L
L
L
X
L
L
H
X
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance “off” state
OUTPUT
Y
Z
L
H
L
H
4
7
9
Ya
Yb
Yc
VCC = Pin 16
GND = Pin 8
APPLICATION
S2
S1
S0
WORD A
WORD B
12
Yd
SF00676
ENABLE
C
B
74F139
A
Y0 Y1 Y2 Y3
WORD C
WORD D
WORD E
WORD F
WORD G
WORD H
4-BIT
DATA
BUS
I0a I1a I0b I1b I0c I1c I0d I1d
OE
74F257A
S
Ya Yb Yc Yd
I0a I1a I0b I1b I0c I1c I0d I1d
OE
74F257A
S
Ya Yb Yc Yd
I0a I1a I0b I1b I0c I1c I0d I1d
OE
74F257A
S
Ya Yb Yc Yd
I0a I1a I0b I1b I0c I1c I0d I1d
OE
74F257A
S
Ya Yb Yc Yd
SF00677
1995 Mar 31
3
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