74LVQ138T 데이터 시트보기 (PDF) - STMicroelectronics
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74LVQ138T Datasheet PDF : 9 Pages
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74LVQ138
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1, 2, 3
4, 5
6
15, 14, 13,
12, 11, 10,
9, 7
8
16
SYMBOL NAME AND FUNCT ION
A, B, C Address Inputs
G2A, G2B Enable Inputs
G1
Enable Input
Y0 to Y7 Outputs
GND
VCC
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
IN PUT S
ENABLE
SELECT
G2B G2A G1
C
B
A
X
X
L
X
X
X
X
H
X
X
X
X
H
X
X
X
X
X
L
L
H
L
L
L
L
L
H
L
L
H
L
L
H
L
H
L
L
L
H
L
H
H
L
L
H
H
L
L
L
L
H
H
L
H
L
L
H
H
H
L
L
L
H
H
H
H
X:Don’t Care
OUTPUTS
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
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
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
LOGIC DIAGRAM
Thislogic diagram has notbe used to esimate propagation delays
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