M74HC131TTR 查看數據表（PDF） - STMicroelectronics
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M74HC131TTR Datasheet PDF : 11 Pages
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M74HC131
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1, 2, 3
4
5
6
9, 10, 11, 12,
13, 14, 15,
7
8
16
SYMBOL
A, B, C
CLOCK
G2
G1
Y0 to Y7
NAME AND FUNCTION
Data Inputs
Clock Input (LOW to
HIGH, Edge-Triggered)
Enable (Active LOW)
Enable (Active HIGH)
Data Outputs
GND
VCC
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
CLOCK
X
X
L
INPUTS
ENABLE
SELECT
G1 G2
C
B
A
X
H
X
X
X
L
X
X
X
X
H
L
L
L
L
H
L
L
L
H
H
L
L
H
L
H
L
L
H
H
H
L
H
L
L
H
L
H
L
H
H
L
H
H
L
H
L
H
H
H
H
L
X
X
X
LOGIC DIAGRAM
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
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
Outputs corresponding to stored address L: all others H
This logic diagram has not be used to estimate propagation delays
2/11
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