5-1

FAST AND LS TTL DATA

BCD DECADE COUNTERS/

4-BIT BINARY COUNTERS

The LS160A / 161A / 162A / 163A are high-speed 4-bit synchronous count-

ers. They are edge-triggered, synchronously presettable, and cascadable

MSI building blocks for counting, memory addressing, frequency division and

other applications. The LS160A and LS162A count modulo 10 (BCD). The

LS161A and LS163A count modulo 16 (binary.)

The LS160A and LS161A have an asynchronous Master Reset (Clear)

input that overrides, and is independent of, the clock and all other control

inputs. The LS162A and LS163A have a Synchronous Reset (Clear) input that

overrides all other control inputs, but is active only during the rising clock

edge.

BCD (Modulo 10)

Binary (Modulo 16)

Asynchronous Reset

LS160A

LS161A

Synchronous Reset

LS162A

LS163A

CONNECTION DIAGRAM DIP (TOP VIEW)

NOTE:

The Flatpak version

has the same pinouts

(Connection Diagram) as

the Dual In-Line Package.

14

13

12

11

10

9

12

345

6

7

16

15

8

VCC

*R

TC

Q0

Q1

Q2

CET

Q3

PE

CP

P0

P1

P2

P3

CEP GND

*MR for LS160A and LS161A

*SR for LS162A and LS163A

PIN NAMES

LOADING (Note a)

HIGH

LOW

PE

P0 –P3

CEP

CET

CP

MR

SR

Q0 –Q3

TC

Parallel Enable (Active LOW) Input

Parallel Inputs

Count Enable Parallel Input

Count Enable Trickle Input

Clock (Active HIGH Going Edge) Input

Master Reset (Active LOW) Input

Synchronous Reset (Active LOW) Input

Parallel Outputs (Note b)

Terminal Count Output (Note b)

1.0 U.L.

0.5 U.L.

0.5 U.L.

1.0 U.L.

0.5 U.L.

0.5 U.L.

1.0 U.L.

10 U.L.

10 U.L.

0.5 U.L.

0.25 U.L.

0.25 U.L.

0.5 U.L.

0.25 U.L.

0.25 U.L.

0.5 U.L.

5 (2.5) U.L.

5 (2.5) U.L.

NOTES:

a) 1 TTL Unit Load (U.L.) = 40

µA HIGH/1.6 mA LOW.

b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74)

Temperature Ranges.

SN54/74LS160A

SN54/74LS161A

SN54/74LS162A

SN54/74LS163A

BCD DECADE COUNTERS /

4-BIT BINARY COUNTERS

LOW POWER SCHOTTKY

J SUFFIX

CERAMIC

CASE 620-09

N SUFFIX

PLASTIC

CASE 648-08

16

1

16

1

ORDERING INFORMATION

SN54LSXXXJ

Ceramic

SN74LSXXXN

Plastic

SN74LSXXXD

SOIC

16

1

D SUFFIX

SOIC

CASE 751B-03

LOGIC SYMBOL

VCC = PIN 16

GND = PIN 8

934

56

7

10

2

15

1

14 131211

PE P0 P1 P2 P3

CEP

CET

CP

*R Q0 Q1 Q2 Q3

TC

*MR for LS160A and LS161A

*SR for LS162A and LS163A