74F242 データシートの表示（PDF） - Philips Electronics
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74F242 Datasheet PDF : 10 Pages
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Philips Semiconductors
Transceivers
Product specification
74F242/74F243
LOGIC SYMBOLS (IEEE/IEC)
74F242
1
EN1
13
EN2
3
1
11
2
4
10
5
9
6
8
SF00769
OEA 1
74F242
A0 3
11 B0
A1 4
10 B1
A2 5
9 B2
A3 6
8 B3
VCC = Pin 14
GND = Pin 7
OEB 13
SF00771
LOGIC DIAGRAMS
FUNCTION TABLE, 74F242
INPUTS
OUTPUTS
OEA
L
OEB
An
Bn
L
INPUT
B=A
H
L
Z
Z
L
H
a
a
H
H
A=B
INPUT
H = High voltage level
L = Low voltage level
Z = High impedance “off” state
a = This condition is not allowed due to excessive currents
74F243
1
EN1
13
EN2
3
1
11
2
4
10
5
9
6
8
SF00770
OEA 1
74F243
A0 3
11 B0
A1 4
10 B1
A2 5
9 B2
A3 6
8 B3
VCC = Pin 14
GND = Pin 7
OEB 13
SF00772
FUNCTION TABLE, 74F243
INPUTS
OEA
L
OEB
L
H
L
L
H
H
H
OUTPUTS
An
Bn
INPUT
B=A
Z
Z
a
a
A=B
INPUT
1990 Aug 30
3
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