74VHC74 查看數據表（PDF） - STMicroelectronics
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74VHC74 Datasheet PDF : 11 Pages
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74VHC74
INPUT EQUIVALENT CIRCUIT
TRUTH TABLE
CLR
L
H
L
H
H
H
X : Don’t Care
INPUTS
PR
D
H
X
L
X
L
X
H
L
H
H
H
X
LOGIC DIAGRAM
PIN DESCRIPTION
PIN No
1, 13
2, 12
3, 11
4, 10
5, 9
6, 8
7
14
SYMBOL NAME AND FUNCTION
1CLR, 2CLR
Asynchronous Reset -
Direct Input
1D, 2D Data Inputs
1CK, 2CK Clock Input
(LOW to HIGH, Edge
Triggered)
1PR, 2PR Asynchronous Set - Direct
Input
1Q, 2Q True Flip-Flop Outputs
1Q, 2Q Complement Flip-Flop
Outputs
GND Ground (0V)
VCC
Positive Supply Voltage
OUTPUTS
CK
Q
Q
X
L
H
X
H
L
X
H
H
L
H
H
L
Qn
Qn
FUNCTION
CLEAR
PRESET
NO CHANGE
This logic diagram has not be used to estimate propagation delays
2/11
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