IN74HC161A
PRESETTABLE COUNTERS
High-Performance Silicon-Gate CMOS
The IN74HC161A is identical in pinout to the LS/ALS161. The
device inputs are compatible with standard CMOS outputs; with
pullup resistors, they are compatible with LS/ALSTTL outputs.
The IN74HC161A is programmable 4-bit synchronous counter
that feature parallel Load, asynchronous Reset, a Carry Output
for cascading and count-enable controls.
The IN74HC161A is binary counter with asynchronous Reset.
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2.0 to 6.0 V
• Low Input Current: 1.0 µA
• High Noise Immunity Characteristic of CMOS Devices
ORDERING INFORMATION
IN74HC161AN Plastic
IN74HC161AD SOIC
TA = -55° to 125° C for all
packages
LOGIC DIAGRAM
PIN ASSIGNMENT
PIN 16 =VCC
PIN 8 = GND
FUNCTION TABLE
Inputs
Outputs
Rese Load Enable Enable Clock
Q0 Q1 Q2 Q3
Function
t
P
X
X
X
L
H
X
T
X
X
L
X
H
X
L
X
L
H
H
H
X
X
L
P0
L
L
P2
L
Reset to “0”
P3 Preset Data
No count
H
H
H
H
H
P1
No change
No change
Count up
No count
Count
No change
No count
X=don’t care
P0,P1,P2,P3 = logic level of Data inputs
Ripple Carry Out = Enable T • Q0 • Q1 • Q2 • Q3
1
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