HD74LS193

Rev.2.00, Feb.18.2005, page 5 of 11

Count Sequences

13

0

14

15

0

Count Up

Count Up

Count Down

Count Down

Data

Inputs

12

1

0

15

14

13

Load

Carry

Clear Preset

Clear

Borrow

B

A

C

D

Outputs

Illustrated below is the following sequence:

1.

Clear outputs to zero.

2.

Load (preset) to binary thirteen.

3.

Count up to fourteen, fifteen, carry, zero, one and two.

4.

Count down to one, zero, borrow, fifteen, fourteen, and thirteen.