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74AC161 Datasheet(PDF) 2 Page - STMicroelectronics

Part # 74AC161
Description  SYNCHRONOUS PRESETTABLE 4-BIT COUNTER
PDF  12 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74AC161 Datasheet(HTML) 2 Page - STMicroelectronics

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INPUT AND OUTPUT EQUIVALENT CIRCUIT
LOGIC DIAGRAMS
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCT ION
1
CLEAR
Master Reset
2
CLOCK
Clock Input (LOW-to-HIGH,
Edge- Triggered)
3, 4, 5, 6
A, B, C, D
Data Inputs
7
PE
Count Enable Input
10
TE
Count Enable Carry Input
9
LOAD
Parallel Enable Input
14, 13, 12,
11
QA to QD
Flip-Flop Outpus
15
CARRY
OUT
Terminal Count Output
8
GND
Ground (0V)
16
VCC
Positive Supply Voltage
TRUTH TABLE
INPUTS
OUTPUT S
FUNCT ION
CLEAR
LOAD
PE
T E
CL OCK
QA
QB
QC
QD
L
X
X
X
X
LLLL
RESET TO ”0”
H
L
X
X
A
B
C
D
PRESET DATA
H
H
X
L
NO CHANGE
NO COUNT
H
H
L
X
NO CHANGE
NO COUNT
H
H
H
H
COUNT UP
COUNT
H
X
X
X
NO CHANGE
NO COUNT
NOTE:
X:Don’t Care
A,B, C,D: Logic level of data input
CARRY OUT=TE
• QA• QB • QC • QD
74AC161
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