2

Functional Diagram

GND = 7

5

6

4

3

9

8

10

11

BINARY

BINARY

13

1

1CP

2CP

COUNTER

COUNTER

1MR

2

12

2MR

TRUTH TABLE

CP COUNT

OUTPUTS

0LLLL

1

H

LLL

2L

H

L

L

3H

HL

L

4LL

H

L

5HLHL

6L

H

H

L

7

HHH

L

8LLL

H

9HL

L

H

10

LHLH

11

H

H

L

H

12

L

L

H

H

13

H

L

H

H

14

L

HHH

15

HHHH

CP COUNT

MR

OUTPUT

↑

L

No Change

↓

L

Count

X

H

L L L L

H = High Voltage Level, L = Low Voltage Level, X = Don’t Care,

↑ = Transition from Low to High Level, ↓ = Transition from High to Low.

CD54HC393, CD74HC393, CD54HCT393, CD74HCT393