5-1

FAST AND LS TTL DATA

PRESETTABLE BCD/DECADE

UP/DOWN COUNTER

PRESETTABLE 4-BIT BINARY

UP/DOWN COUNTER

The SN54/74LS192 is an UP/DOWN BCD Decade (8421) Counter and the

SN54/74LS193 is an UP/DOWN MODULO-16 Binary Counter. Separate

Count Up and Count Down Clocks are used and in either counting mode the

circuits operate synchronously. The outputs change state synchronous with

the LOW-to-HIGH transitions on the clock inputs.

Separate Terminal Count Up and Terminal Count Down outputs are

provided which are used as the clocks for a subsequent stages without extra

logic, thus simplifying multistage counter designs. Individual preset inputs

allow the circuits to be used as programmable counters. Both the Parallel

Load (PL) and the Master Reset (MR) inputs asynchronously override the

clocks.

NOTE:

The Flatpak version

has the same pinouts

(Connection Diagram) as

the Dual In-Line Package.

CONNECTION DIAGRAM DIP (TOP VIEW)

14

13

12

11

10

9

1

2345

6

7

16

15

8

VCC

P1

P0

MR

TCD TCU

P2

PL

P3

Q1

Q0

CPD CPU

Q2

Q3

GND

PIN NAMES

LOADING (Note a)

HIGH

LOW

CPU

CPD

MR

PL

Pn

Qn

TCD

TCU

Count Up Clock Pulse Input

Count Down Clock Pulse Input

Asynchronous Master Reset (Clear) Input

Asynchronous Parallel Load (Active LOW) Input

Parallel Data Inputs

Flip-Flop Outputs (Note b)

Terminal Count Down (Borrow) Output (Note b)

Terminal Count Up (Carry) Output (Note b)

0.5 U.L.

0.5 U.L.

0.5 U.L.

0.5 U.L.

0.5 U.L.

10 U.L.

10 U.L.

10 U.L.

0.25 U.L.

0.25 U.L.

0.25 U.L.

0.25 U.L.

0.25 U.L.

5 (2.5) 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)

SN54/74LS192

SN54/74LS193

PRESETTABLE BCD / DECADE

UP / DOWN COUNTER

PRESETTABLE 4-BIT BINARY

UP / DOWN COUNTER

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

5

4

32

6

7

12

9

10

1

15

11

CPD

Q0 Q1 Q2 Q3

TCD

P3

P2

P1

P0

PL

CPU

TCU

13

MR

14