SN54HCT74, SN74HCT74

DUAL DTYPE POSITIVEEDGETRIGGERED FLIPFLOPS

WITH CLEAR AND PRESET

SCLS169E − DECEMBER 1982 − REVISED APRIL 2004

1

POST OFFICE BOX 655303

description/ordering information

The ’HCT74 devices contain two independent

D-type positive-edge-triggered flip-flops. A low

level at the preset (PRE) or clear (CLR) inputs sets

or resets the outputs, regardless of the levels of

the other inputs. When PRE and CLR are inactive

(high), data at the data (D) input meeting the setup

time requirements are transferred to the outputs

on the positive-going edge of the clock (CLK)

pulse. Clock triggering occurs at a voltage level

and is not directly related to the rise time of CLK.

Following the hold-time interval, data at the

D input may be changed without affecting the

levels at the outputs.

ORDERING INFORMATION

TA

PACKAGE†

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

PDIP − N

Tube of 25

SN74HCT74N

SN74HCT74N

Tube of 50

SN74HCT74D

SOIC − D

Reel of 2500

SN74HCT74DR

HCT74

SOIC − D

Reel of 250

SN74HCT74DT

HCT74

−40

°C to 85°C

SOP − NS

Reel of 2000

SN74HCT74NSR

HCT74

−40 C to 85 C

SSOP − DB

Reel of 2000

SN74HCT74DBR

HT74

Tube of 90

SN74HCT74PW

TSSOP − PW

Reel of 2000

SN74HCT74PWR

HT74

TSSOP − PW

Reel of 250

SN74HCT74PWT

HT74

CDIP − J

Tube of 25

SNJ54HCT74J

SNJ54HCT74J

−55

°C to 125°C

CFP − W

Tube of 150

SNJ54HCT74W

SNJ54HCT74W

−55 C to 125 C

LCCC − FK

Tube of 55

SNJ54HCT74FK

SNJ54HCT74FK

† 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.

1

2

3

4

5

6

7

14

13

12

11

10

9

8

1CLR

1D

1CLK

1PRE

1Q

1Q

GND

2CLR

2D

2CLK

2PRE

2Q

2Q

SN54HCT74 ...J OR W PACKAGE

SN74HCT74 . . . D, DB, N, NS, OR PW PACKAGE

(TOP VIEW)

32 1 20 19

910 11 1213

4

5

6

7

8

18

17

16

15

14

2D

NC

2CLK

NC

2PRE

1CLK

NC

1PRE

NC

1Q

SN54HCT74 . . . FK PACKAGE

(TOP VIEW)

NC − No internal connection

Copyright

 2004, 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.