74AC161 查看數據表（PDF） - STMicroelectronics
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74AC161 Datasheet PDF : 12 Pages
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74AC161
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
S YM BO L
CLEAR
CLOCK
A, B, C, D
PE
TE
LOAD
QA to QD
NAME AND FUNCTION
Master Reset
Clock Input (LOW-to-HIGH,
Edge- Triggered)
Data Inputs
Count Enable Input
Count Enable Carry Input
Parallel Enable Input
Flip-Flop Outpus
CARRY
OUT
GND
VCC
Terminal Count Output
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUT S
OUTPUTS
CLEAR LOAD PE
T E CL OCK 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
NOTE:
X
X
X
X:Don’t Care
A,B, C,D: Logic level of data input
CARRY OUT=TE • QA • QB • QC • QD
NO CHANGE
LOGIC DIAGRAMS
FUNCTION
RESET TO ”0”
PRESET DATA
NO COUNT
NO COUNT
COUNT
NO COUNT
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