SN54HCT574, SN74HCT574

OCTAL EDGETRIGGERED DTYPE FLIPFLOPS

WITH 3STATE OUTPUTS

SCLS177E − MARCH 1984 − REVISED AUGUST 2003

1

POST OFFICE BOX 655303

Drive Bus Lines Directly or Up To 15 LSTTL

Loads

description/ordering information

These octal edge-triggered D-type flip-flops

feature 3-state outputs designed specifically for

bus driving. The ’HCT574 devices are particularly

suitable for implementing buffer registers, I/O

ports, bidirectional bus drivers, and working

registers.

The eight flip-flops enter data on the low-to-high

transition of the clock (CLK) input.

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 of 20

SN74HCT574N

SN74HCT574N

SOIC − DW

Tube of 25

SN74HCT574DW

HCT574

SOIC − DW

Reel of 2000

SN74HCT574DWR

HCT574

−40

°C to 85°C

SOP − NS

Reel of 2000

SN74HCT574NSR

HCT574

−40

°C to 85°C

SSOP − DB

Reel of 2000

SN74HCT574DBR

HT574

Tube of 70

SN74HCT574PW

TSSOP − PW

Reel of 2000

SN74HCT574PWR

HT574

TSSOP − PW

Reel of 250

SN74HCT574PWT

HT574

CDIP − J

Tube of 20

SNJ54HCT574J

SNJ54HCT574J

−55

°C to 125°C

CFP − W

Tube of 85

SNJ54HCT574W

SNJ54HCT574W

−55 C to 125 C

LCCC − FK

Tube of 55

SNJ54HCT574FK

SNJ54HCT574FK

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

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

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.

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

SN54HCT574 . . . FK PACKAGE

(TOP VIEW)

SN54HCT574 ...J OR W PACKAGE

SN74HCT574 . . . 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

CLK