SN54AC74, SN74AC74

DUAL POSITIVEEDGETRIGGERED DTYPE FLIPFLOPS

WITH CLEAR AND PRESET

SCAS521F − AUGUST 1995 − REVISED OCTOBER 2003

1

POST OFFICE BOX 655303

description/ordering information

The ’AC74 devices are dual positive-edge-

triggered D-type flip-flops.

A low level at the preset (PRE) or clear (CLR) input

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 is transferred to the

outputs on the positive-going edge of the clock

pulse. Clock triggering occurs at a voltage level

and is not directly related to the rise time of the

clock pulse. Following the hold-time interval, data

at D can be changed without affecting the levels

at the outputs.

ORDERING INFORMATION

TA

PACKAGE†

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

PDIP − N

Tube

SN74AC74N

SN74AC74N

SOIC − D

Tube

SN74AC74D

AC74

SOIC − D

Tape and reel

SN74AC74DR

AC74

−40

°C to 85°C

SOP − NS

Tape and reel

SN74AC74NSR

AC74

−40 C to 85 C

SSOP − DB

Tape and reel

SN74AC74DBR

AC74

TSSOP − PW

Tube

SN74AC74PW

AC74

TSSOP − PW

Tape and reel

SN74AC74PWR

AC74

CDIP − J

Tube

SNJ54AC74J

SNJ54AC74J

−55

°C to 125°C

CFP − W

Tube

SNJ54AC74W

SNJ54AC74W

−55 C to 125 C

LCCC − FK

Tube

SNJ54AC74FK

SNJ54AC74FK

† 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

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.

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

SN54AC74 . . . FK PACKAGE

(TOP VIEW)

SN54AC74 ...J OR W PACKAGE

SN74AC74 . . . D, DB, N, NS, OR PW PACKAGE

(TOP VIEW)

3

2

1 20 19

910 11 12 13

4

5

6

7

8

18

17

16

15

14

2D

NC

2CLK

NC

2PRE

1CLK

NC

1PRE

NC

1Q

NC − No internal connection

On products compliant to MILPRF38535, all parameters are tested

unless otherwise noted. On all other products, production

processing does not necessarily include testing of all parameters.