54ACT11533, 74ACT11533

OCTAL DTYPE TRANSPARENT LATCHES

WITH 3STATE OUTPUTS

SCAS017A − D2957, JULY 1987 − REVISED APRIL 1993

POST OFFICE BOX 655303

Copyright

2−1

PCB Layout

Minimize High-Speed Switching Noise

CMOS) 1-

mm Process

Outline Packages, Ceramic Chip Carriers,

and Standard Plastic and Ceramic 300-mil

DIPs

description

These eight latches feature 3-state outputs

designed specifically for driving highly capacitive

or relatively low-impedance loads.

They are

particularly suitable for implementing buffer

registers, I/O ports, bidirectional bus drivers, and

working registers.

The

eight

latches

of

the

′ACT11533 are

transparent D-type latches. While the enable (C)

is high, the Q outputs will follow the complements

of the (D) inputs. When the output control OC is

taken low, the Q outputs will be latched.

The

′ACT11533 is functionally equivalent to the

′ACT11373 except for having inverted outputs.

A buffered output-control (OC) input can be used

to place the eight outputs in either a normal

logic state (high or low logic levels) or a high-

impedance state. In the high-impedance state,

the outputs neither load nor drive the bus lines

significantly. The high-impedance third state and

increased drive provide the capability to drive the

bus lines in a bus-organized system without need

for interface or pullup components.

The output control (OC) does not affect the

internal operations of the latches. Old data can be

retained or new data can be entered while the

outputs are off.

The 54ACT11533 is characterized for operation over the full military temperature range of −55

°C to 125°C. The

74ACT11533 is characterized for operation from − 40

°C to 85°C.

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.

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

1Q

2Q

3Q

4Q

GND

GND

GND

GND

5Q

6Q

7Q

8Q

OC

1D

2D

3D

4D

5D

6D

7D

8D

C

54ACT11533 . . . JT PACKAGE

74ACT11533 . . . DW OR NT PACKAGE

(TOP VIEW)

32 1

13 14

5

6

7

8

9

10

11

7D

8D

C

NC

8Q

7Q

6Q

2D

1D

OC

NC

1Q

2Q

3Q

4

15 16 17 18

54ACT11533 . . . FK PACKAGE

(TOP VIEW)

28 27 26

25

24

23

22

21

20

19

12

NC − No internal connection

OUTPUT

Q

INPUTS

L

L

L

H

H

H

L

X

H

L

X

X

OC

CD

L

H

Q0

Z

FUNCTION TABLE

(each latch)

EPIC is a trademark of Texas Instruments Incorporated.