SN74F169

SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTER

SDFS089 – MARCH 1987 – REVISED OCTOBER 1993

2–5

POST OFFICE BOX 655303

typical load, count, and inhibit sequences

Illustrated below is the following sequence:

1.

Load (preset) to binary thirteen

2.

Count up to fourteen, fifteen (maximum), zero, one, and two

3.

Inhibit

4.

Count down to one, zero (minimum), fifteen, fourteen, and thirteen

Data

Inputs

Data

Outputs

LOAD

A

B

C

D

CLK

U/D

ENP and ENT

RCO

QA

QB

QC

QD

Load

Count Up

Inhibit

13

14

15

0

0

12

Count Down

2

21

13

15

14