M74HC161(2001) データシートの表示（PDF） - STMicroelectronics
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M74HC161 Datasheet PDF : 12 Pages
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M74HC161
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
2
3, 4, 5, 6
7
10
9
14, 13, 12,
11
15
8
16
SYMBOL
CLEAR
CLOCK
A, B, C, D
PE
TE
LOAD
NAME AND FUNCTION
Asynchronous Master
Reset
Clock Input (LOW to
HIGH, Edge-triggered)
Data Inputs
Count Enable Input
Count Enable Carry Input
Parallel Enable Input
QA to QD Flip Flop Outputs
CARRY
GND
Vcc
Terminal Count Output
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUTS
OUTPUTS
CLEAR LOAD PE
TE CLOCK QA
QB
QC
QD
L
X
X
X
X
L
L
L
L
H
L
X
X
A
B
C
D
H
H
X
L
NO CHANGE
H
H
L
X
NO CHANGE
H
H
H
H
COUNT UP
H
X
X
X
X : Don’t Care
A, B, C, D : Logic level of data inputs
Carry : CARRY = TE·QA·QB·QC·QD
NO CHANGE
LOGIC DIAGRAM
FUNCTION
RESET TO "0"
PRESET DATA
NO COUNT
NO COUNT
COUNT
NO COUNT
This logic diagram has not be used to estimate propagation delays
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