74AC161M STMicroelectronics, 74AC161M Datasheet - Page 2

• Manufacturer Part Number: 74AC161M
• Description: Counter ICs Sync Binary Counter
• Manufacturer: STMicroelectronics

Specifications of 74AC161M

• Logic Family: 74AC
• Number Of Bits: 4
• Counting Method: Synchronous
• Counting Sequence: Up
• Mounting Style: SMD/SMT
• Package / Case: SO-16
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

74AC161
INPUT AND OUTPUT EQUIVALENT CIRCUIT
TRUTH TABLE
X : Don’t Care; A, B, C, D; Logic level of data input; CARRY OUT : TE x QA x QB x QC x QD
LOGIC DIAGRAM
2/13
CLEAR
H
H
H
H
H
L
LOAD
X
H
H
H
X
L
INPUTS
PE
X
X
X
H
X
L
TE
X
X
X
H
X
L
CK
X
A
L
PIN DESCRIPTION
14, 13, 12,
3, 4, 5, 6
PIN No
10
15
16
11
1
2
7
9
8
NO CHANGE
NO CHANGE
NO CHANGE
B
L
COUNT UP
OUTPUTS
CARRY OUT Terminal Count Output
A, B, C, D
SYMBOL
QA toQD
CLEAR
CLOCK
LOAD
C
GND
L
V
PE
TE
CC
Master Reset
Clock Input (LOW to
HIGH Edge Trigger)
Data Inputs
Count Enable Input
Count Enable Carry Input
Parallel Enable Input
Flip-Flop Outputs
Ground (0V)
Positive Supply Voltage
D
L
NAME AND FUNCTION
PRESET TO "0"
PRESET DATA
NO COUNT
NO COUNT
NO COUNT
FUNCTION
COUNT