5-1

FAST AND LS TTL DATA

DUAL DECADE COUNTER;

DUAL 4-STAGE

BINARY COUNTER

The SN54 / 74LS390 and SN54 / 74LS393 each contain a pair of high-speed

4-stage ripple counters. Each half of the LS390 is partitioned into a

divide-by-two section and a divide-by five section, with a separate clock input

for each section. The two sections can be connected to count in the 8.4.2.1

BCD code or they can count in a biquinary sequence to provide a square wave

(50% duty cycle) at the final output.

Each half of the LS393 operates as a Modulo-16 binary divider, with the last

three stages triggered in a ripple fashion. In both the LS390 and the LS393,

the flip-flops are triggered by a HIGH-to-LOW transition of their CP inputs.

Each half of each circuit type has a Master Reset input which responds to a

HIGH signal by forcing all four outputs to the LOW state.

CONNECTION DIAGRAM DIP (TOP VIEW)

SN54 / 74LS390

SN54 / 74LS393

NOTE:

The Flatpak version

has the same pinouts

(Connection Diagram) as

the Dual In-Line Package.

14

13

12

11

10

9

123456

8

7

VCC

CP

MR

Q0

Q1

Q2

Q3

CP

MR

Q0

Q1

Q2

Q3

GND

14

13

12

11

10

9

1

2345

6

7

16

15

8

VCC

CP0

CP0

MR

Q0

CP1

Q2

Q1

Q3

MR

Q0

CP1

Q1

Q2

Q3

GND

SN54/74LS390

SN54/74LS393

LOW POWER SCHOTTKY

ORDERING INFORMATION

SN54LSXXXJ

Ceramic

SN74LSXXXN

Plastic

SN74LSXXXD

SOIC

J SUFFIX

CERAMIC

CASE 620-09

N SUFFIX

PLASTIC

CASE 648-08

16

1

16

1

16

1

D SUFFIX

SOIC

CASE 751B-03

DUAL DECADE COUNTER;

DUAL 4-STAGE

BINARY COUNTER

J SUFFIX

CERAMIC

CASE 632-08

N SUFFIX

PLASTIC

CASE 646-06

14

1

14

1

14

1

D SUFFIX

SOIC

CASE 751A-02