M74HC109_01 Datasheet, PDF (2/12 Pages) STMicroelectronics – DUAL J-K FLIP FLOP WITH PRESET AND CLEAR

M74HC109
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
SYMBOL NAME AND FUNCTION
1,15
2, 14, 3, 13
4, 12
5, 11
6, 10
7, 9
8
16
1CLR, 2CLR
Asynchronous Reset
Direct Input
1J, 2J, 1K, Synchronous Inputs;
2K
Flip-Flops 1 and 2
1CK, 2CK Clock Input
1PR, 2PR
Asynchronous Set Direct
Input (Active Low)
1Q, 2Q True Flip-Flop Outputs
1Q, 2Q
Complement Flip-Flop
Outputs
GND Ground (0V)
Vcc
Positive Supply Voltage
TRUTH TABLE
INPUTS
CLR
PR
J
K
L
H
X
X
H
L
X
X
L
L
X
X
H
H
L
H
H
H
L
L
H
H
H
H
H
H
H
L
H
H
X
X
X : Don’t Care
LOGIC DIAGRAM
OUTPUTS
CK
Q
Q
X
L
H
X
H
L
X
H
H
Qn
Qn
L
H
H
L
Qn
Qn
Qn
Qn
FUNCTION
CLEAR
PRESET
----
NO CHANGE
----
----
TOGGLE
NO CHANGE
This logic diagram has not be used to estimate propagation delays
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