SN54HCT573, SN74HCT573

OCTAL TRANSPARENT D-TYPE LATCHES

WITH 3-STATE OUTPUTS

SCLS176E – MARCH 1984 – REVISED JULY 2003

1

POST OFFICE BOX 655303

Lines Directly or Up To 15 LSTTL Loads

description/ordering information

These octal transparent D-type latches feature

3-state outputs designed specifically for driving

highly capacitive or relatively low-impedance

loads. The ’HCT573 devices are particularly

suitable for implementing buffer registers, I/O

ports, bidirectional bus drivers, and working

registers.

While the latch-enable (LE) input is high, the

Q outputs respond to the data (D) inputs. When

LE is low, the outputs are latched to retain the data

that was set up at the D inputs.

A buffered output-enable (OE) input can be used

to place the eight outputs in either a normal logic

state

(high

or

low

logic

levels)

or

the

high-impedance state. In the high-impedance

state, the outputs neither load nor drive the bus lines significantly. The high-impedance state and increased

drive provide the capability to drive bus lines without interface or pullup components.

ORDERING INFORMATION

TA

PACKAGE†

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

PDIP – N

Tube

SN74HCT573N

SN74HCT573N

SOIC

DW

Tube

SN74HCT573DW

HCT573

SOIC – DW

Tape and reel

SN74HCT573DWR

HCT573

–40

°C to 85°C

SOP – NS

Tape and reel

SN74HCT573NSR

HCT573

SSOP – DB

Tape and reel

SN74HCT573DBR

HT573

TSSOP

PW

Tube

SN74HCT573PW

HT573

TSSOP – PW

Tape and reel

SN74HCT573PWR

HT573

CDIP – J

Tube

SNJ54HCT573J

SNJ54HCT573J

–55

°C to 125°C

CFP – W

Tube

SNJ54HCT573W

SNJ54HCT573W

LCCC – FK

Tube

SNJ54HCT573FK

SNJ54HCT573FK

† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are

available at www.ti.com/sc/package.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

32 1 20 19

910 11 1213

4

5

6

7

8

18

17

16

15

14

2Q

3Q

4Q

5Q

6Q

3D

4D

5D

6D

7D

SN54HCT573 . . . FK PACKAGE

(TOP VIEW)

SN54HCT573 ...J OR W PACKAGE

SN74HCT573 . . . DB, DW, N, NS, OR PW PACKAGE

(TOP VIEW)

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

OE

1D

2D

3D

4D

5D

6D

7D

8D

GND

1Q

2Q

3Q

4Q

5Q

6Q

7Q

8Q

LE

Copyright

 2003, Texas Instruments Incorporated

UNLESS OTHERWISE NOTED this document contains PRODUCTION

DATA information 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.