74AC11593

8BIT BINARY COUNTER

WITH 3STATE I/O INPUT REGISTERS

SCAS202 − MARCH 1992 − REVISED APRIL 1993

POST OFFICE BOX 655303

POST OFFICE BOX 1443

Copyright

2−1

Counter Outputs

Clear

PCB Layout

Minimize High-Speed Switching Noise

CMOS) 1-

mm Process

at 125

°C

Small-Outline Packages and Standard

Plastic 300-mil DIPs

description

The 74AC11953 consists of a parallel input, an 8-bit storage register feeding an 8-bit counter, and a 3-state I/O

which provides parallel count outputs. Both the register and the counter have individual positive-edge triggered

clocks.

The function tables show the operation of the counter clock-enable (CCKEN, CCKEN) and output-enable (OE,

OE) inputs. A register clock-enable (RCK) input is also provided.

The counter (RCO) input has direct load and clear functions. A low-going RCO pulse will be obtained when the

counter reaches the hex word FF. Expansion is easily accomplished for two stages by connecting RCO of the

first stage to CCKEN of the second stage. Cascading for larger count chains can be accomplished by

connecting RCO of each stage to CCK of the following stage.

The 74AC11593 is characterized for operation from − 40

°C to 85°C.

INPUTS

OUTPUTS

A/QA THRU H/QH

L

H

L

H

COUNTER CLOCK ENABLE

CCKEN

Enable

Disable

Enable

Enable

CCKEN

L

L

H

H

INPUTS

OUTPUTS

A/QA THRU H/QH

L

H

L

H

OUTPUT ENABLE

OE

Input mode

Input mode

Output mode

Input mode

OE

L

L

H

H

Function Tables

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

GND

GND

GND

GND

CCK

CCLR

CCKEN

CCKEN

CLOAD

OE

OE

RCK

RCK

RCO

DW OR NT PACKAGE

(TOP VIEW)

EPIC is a trademark of Texas Instruments Incorporated.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.