M74HC109B1R View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
M74HC109B1R Datasheet PDF : 12 Pages
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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
2/12
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