SN54ALS169B, SN54AS169A, SN74ALS169B, SN74AS169A

SYNCHRONOUS 4BIT UP/DOWN BINARY COUNTERS

SDAS125B − MARCH 1984 − REVISED DECEMBER 1994

2−4

POST OFFICE BOX 655303

POST OFFICE BOX 1443

typical load, count, and inhibit sequences

The following sequence is illustrated below:

1.

Load (preset) to binary 13

2.

Count up to 14, 15 (maximum), 0, 1, and 2

3.

Inhibit

4.

Count down to 1, 0 (minimum), 15, 14, and 13

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

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

−55

°C to 125°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74ALS169B

0

°C to 70°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range

−65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.