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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 clockinputs. 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.

SN54/74LS192SN54/74LS193

PRESETTABLE BCD/ DECADE UP/ DOWN COUNTER PRESETTABLE 4-BIT BINARY UP/ DOWN COUNTER
LOW POWER SCHOTTKY

J SUFFIX CERAMIC CASE 620-09
16 1

• • • • • • •

Low Power . . . 95 mW Typical Dissipation High Speed . . . 40 MHz Typical Count Frequency Synchronous Counting Asynchronous Master Reset and Parallel Load Individual Preset Inputs Cascading Circuitry Internally Provided Input ClampDiodes Limit High Speed Termination Effects

16 1

N SUFFIX PLASTIC CASE 648-08

CONNECTION DIAGRAM DIP (TOP VIEW)
VCC 16 P0 15 MR 14 TCD 13 TCU 12 PL 11 P2 10 P3 9

16 1

D SUFFIX SOIC CASE 751B-03

ORDERING INFORMATION
NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package.

SN54LSXXXJ SN74LSXXXN SN74LSXXXD

Ceramic Plastic SOIC

1P1

2 Q1

3 Q0

4 CPD

5 CPU

6 Q2

7 Q3

8 GND

LOGIC SYMBOL
11 15 1 10 9

PIN NAMES

LOADING (Note a) HIGH LOW 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.
5 4 CPU CPD PL P0 P1 P2 P3 TCU TCD

CPU CPD MR PL Pn Qn TCD TCU

Count Up Clock Pulse Input Count Down Clock Pulse Input Asynchronous Master Reset (Clear) InputAsynchronous 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.

12

MR Q0 Q1 Q2 Q3 14 3 2 6 7

13

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) b. Temperature Ranges.

VCC = PIN 16 GND = PIN 8

FAST AND LS TTL DATA 5-351

SN54/74LS192 • SN54/74LS193
STATE DIAGRAMS LS192 LOGIC EQUATIONS FOR TERMINAL COUNT
TCU = Q0 ⋅ Q3 ⋅ CPU TCD = Q0 ⋅ Q1 ⋅ Q2 ⋅ Q3 ⋅ CPD

0

1

2

3

4

0

1

2

3

4

15

5

15

5

14

6

14

6

LS193 LOGIC EQUATIONS FOR TERMINAL COUNT
137

TCU = Q0 ⋅ Q1⋅ Q2⋅ Q3 ⋅ CPU TCD = Q0 ⋅ Q1 ⋅ Q2 ⋅ Q3 ⋅ CPD

13

7

12

11

10

9

8 COUNT UP

12

11

10

9

8

LS192

COUNT DOWN

LS193

LOGIC DIAGRAMS

P0 PL (LOAD) CPU (UP COUNT)
5 11 15 1

P1
10

P2
9

P3

12

TCU (CARRY OUTPUT)

S

D

Q T Q

S

D

Q T Q

S

D

Q T Q

S

D

Q

T

C

D

C

D

C

D

CQ D

13

TCD (BORROW OUTPUT)

CPD (DOWN COUNT) MR (CLEAR)

4

14

3

2

6

7

Q0

Q1

Q2

Q3

VCC = PIN 16 GND = PIN 8 = PIN NUMBERS

LS192

FAST AND LS TTL DATA 5-352

SN54/74LS192 • SN54/74LS193

LOGIC DIAGRAMS (continued)
P0 PL (LOAD) CPU (UP COUNT)
5 12 11 15 1

P1
10

P2
9

P3

TCU (CARRY OUTPUT)

S

D

Q T Q

S

D

Q T Q

SD

Q T Q

S

D

Q

T

C

D

C

D

C

D

C

Q D

13

TCD (BORROW OUTPUT)

CPD (DOWN COUNT) MR (CLEAR)

4

14

3

2

6

7

Q0

Q1

Q2

Q3

LS193
VCC = PIN 16 GND = PIN 8 = PIN NUMBERS

FAST AND LS TTL DATA 5-353

SN54/74LS192 • SN54/74LS193
FUNCTIONAL DESCRIPTION The LS192 and LS193 are Asynchronously Presettable Decade and 4-Bit Binary...