TECHNICAL DATA

IN74AC161

Presettable Counter

High-Speed Silicon-Gate CMOS

The

IN74AC161

is

identical

in

pinout

to

the

LS/ALS161,

HC/HCT161. The device inputs are compatible with standard CMOS

outputs; with pullup resistors, they are compatible with LS/ALS outputs.

ORDERING INFORMATION

IN74AC161N Plastic

IN74AC161D SOIC

The IN74AC161 is programmable 4-bit synchronous modulo-16

counter that feature parallel Load, asynchronous Reset, a Carry Output for

cascading and count-enable controls.

The IN74AC161 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; 0.1 μA @ 25° C

• High Noise Immunity Characteristic of CMOS Devices

• Outputs Source/Sink 24 mA

LOGIC DIAGRAM

Outputs

PIN 8 = GND

FUNCTION TABLE

Inputs

Outputs

Rev. 00

Reset

Load

Enable

P

Enable

T

Clock

Q0

Q1

Q2

Q3

Function

L

X

X

X

X

L

L

L

L

Reset to “0”

H

L

X

X

P0

P1

P2

P3

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

X=don’t care

P0,P1,P2,P3 = logic level of Data inputs

Ripple Carry Out = Enable T

• Q0 • Q1 • Q2 • Q3

PIN ASSIGNMENT