IN74ACT161

1

High-Speed Silicon-Gate CMOS

The IN74ACT161 is identical in pinout to the LS/ALS161,

HC/HCT161. The IN74ACT161 may be used as a level converter

for interfacing TTL or NMOS outputs to High Speed CMOS Inputs.

The IN74ACT161 is programmable 4-bit synchronous modulo-

16 counter that feature parallel Load, asynchronous Reset, a

Carry Output for cascading and count-enable controls.

The IN74ACT161 is binary counter with asynchronous Reset.

• TTL/NMOS Compatible Input Levels

• Outputs Directly Interface to CMOS, NMOS, and TTL

• Operating Voltage Range: 4.5 to 5.5 V

• Low Input Current: 1.0 µA; 0.1 µA @ 25° C

• Outputs Source/Sink 24 mA

ORDERING INFORMATION

IN74ACT161N Plastic

IN74ACT161D SOIC

packages

LOGIC DIAGRAM

PIN 8 = GND

FUNCTION TABLE

Inputs

Outputs

Rese

t

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