M74HC74B1R Просмотр технического описания (PDF) - STMicroelectronics
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M74HC74B1R Datasheet PDF : 12 Pages
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M74HC74
INPUT AND OUTPUT EQUIVALENT CIRCUIT
TRUTH TABLE
INPUTS
CLR
PR
D
CK
L
H
X
X
H
L
X
X
L
L
X
X
H
H
L
H
H
H
H
H
X
X : Don’t Care
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
Clock Input
1CK, 2CK (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
Q
Q
L
H
H
L
H
H
L
H
H
L
Qn
Qn
FUNCTION
CLEAR
PRESET
----
----
----
NO CHANGE
This logic diagram has not be used to estimate propagation delays
2/12
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