74F138 데이터 시트보기 (PDF) - Philips Electronics
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74F138 Datasheet PDF : 8 Pages
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Philips Semiconductors
1-of-8 decoder/demultiplexer
Product specification
74F138
LOGIC DIAGRAM
3
A2
A1 2
1
A0
4
E0
5
E1
6
E2
VCC = Pin 16
GND = Pin 8
15 14 13 12 11 10 9
7
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
SF00177
FUNCTION TABLE
INPUTS
OUTPUTS
E0
E1
E2
A0
A1
A2
Q0
Q1
Q2
Q3
Q4
H
X
X
X
X
X
H
H
H
H
H
X
H
X
X
X
X
H
H
H
H
H
X
X
L
X
X
X
H
H
H
H
H
L
L
H
L
L
L
L
H
H
H
H
L
L
H
H
L
L
H
L
H
H
H
L
L
H
L
H
L
H
H
L
H
H
L
L
H
H
H
L
H
H
H
L
H
L
L
H
L
L
H
H
H
H
H
L
L
L
H
H
L
H
H
H
H
H
H
L
L
H
L
H
H
H
H
H
H
H
L
L
H
H
H
H
H
H
H
H
H
NOTES:
H = High voltage level
L = Low voltage level
X = Don’t care
APPLICATION
A0
A1
A2
A3
A4
H
E2
A0 A1 A2
E1
74F138
E0
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
E2
A0 A1 A2
E1
74F138
E0
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
74F04
E2
A0 A1 A2
E1
74F138
E0
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
Q5
Q6
Q7
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
L
H
H
H
L
E2
A0 A1 A2
E1
74F138
E0
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
Q0
Figure 1. Expansion of 1-of-8 Decoding
Q31
SF00178
February 14, 1991
3
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