© Semiconductor Components Industries, LLC, 2006

July, 2006 − Rev. 2

1

Publication Order Number:

SN74LS161A/D

SN74LS161A, SN74LS163A

BCD Decade Counters/

4−Bit Binary Counters

The LS161A/163A are high-speed 4-bit synchronous counters.

They are edge-triggered, synchronously presettable, and cascadable

MSI building blocks for counting, memory addressing, frequency

division and other applications. The LS161A and LS163A count

modulo 16 (binary).

The LS161A has an asynchronous Master Reset (Clear) input that

overrides, and is independent of, the clock and all other control inputs.

The LS163A has a Synchronous Reset (Clear) input that overrides all

other control inputs, but is active only during the rising clock edge.

Binary (Modulo 16)

Asynchronous Reset

LS161A

Synchronous Reset

LS163A

GUARANTEED OPERATING RANGES

Symbol

Parameter

Min

Typ

Max

Unit

Supply Voltage

4.75

5.0

5.25

V

Operating Ambient

Temperature Range

0

25

70

°C

Output Current − High

−0.4

mA

Output Current − Low

8.0

mA

LOW

POWER

SCHOTTKY

SOIC

D SUFFIX

CASE 751B

PLASTIC

N SUFFIX

CASE 648

16

1

16

1

SOEIAJ

M SUFFIX

CASE 966

16

1

Device

Package

Shipping

ORDERING INFORMATION

SN74LS161AN

16 Pin DIP

2000 Units/Box

SN74LS161AD

SOIC−16

38 Units/Rail

SN74LS161ADR2

SOIC−16

2500/Tape & Reel

SN74LS161AM

SOEIAJ−16

See Note 1

SN74LS161AMEL

SOEIAJ−16

1. For ordering information on the EIAJ version of

the SOIC package, please contact your local

ON Semiconductor representative.

See Note 1

http://onsemi.com

16 Pin DIP

2000 Units/Box

SN74LS163AD

SOIC−16

38 Units/Rail

SN74LS163ADR2

SOIC−16

2500/Tape & Reel

SN74LS163AM

SOEIAJ−16

See Note 1

SN74LS163AMEL

SOEIAJ−16

See Note 1

SN74LS163AN