SN54AHCT74, SN74AHCT74

DUAL POSITIVE-EDGE-TRIGGERED D-TYPE FLIP-FLOPS

WITH CLEAR AND PRESET

SCLS263N – DECEMBER 1995 – REVISED JULY 2003

1

POST OFFICE BOX 655303

JESD 17

– 2000-V Human-Body Model (A114-A)

– 200-V Machine Model (A115-A)

– 1000-V Charged-Device Model (C101)

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

SN54AHCT74 ...J OR W PACKAGE

SN74AHCT74 . . . D, DB, DGV, N, NS,

OR PW PACKAGE

(TOP VIEW)

32 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

SN54AHCT74 . . . FK PACKAGE

(TOP VIEW)

NC – No internal connection

SN74AHCT74 . . . RGY PACKAGE

(TOP VIEW)

114

78

2

3

4

5

6

13

12

11

10

9

2CLR

2D

2CLK

2PRE

2Q

1D

1CLK

1PRE

1Q

1Q

description/ordering information

The ’AHCT74 dual positive-edge-triggered devices are D-type 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 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 the D input can be changed without affecting the levels at the outputs.

ORDERING INFORMATION

TA

PACKAGE†

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

QFN – RGY

Tape and reel

SN74AHCT74RGYR

HB74

PDIP – N

Tube

SN74AHCT74N

SN74AHCT74N

SOIC – D

Tube

SN74AHCT74D

AHCT74

SOIC – D

Tape and reel

SN74AHCT74DR

AHCT74

–40

°C to 85°C

SOP – NS

Tape and reel

SN74AHCT74NSR

AHCT74

SSOP – DB

Tape and reel

SN74AHCT74DBR

HB74

TSSOP

PW

Tube

SN74AHCT74PW

HB74

TSSOP – PW

Tape and reel

SN74AHCT74PWR

HB74

TVSOP – DGV

Tape and reel

SN74AHCT74DGVR

HB74

CDIP – J

Tube

SNJ54AHCT74J

SNJ54AHCT74J

–55

°C to 125°C

CFP – W

Tube

SNJ54AHCT74W

SNJ54AHCT74W

LCCC – FK

Tube

SNJ54AHCT74FK

SNJ54AHCT74FK

† 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.

On products compliant to MIL-PRF-38535, all parameters are tested

unless otherwise noted. On all other products, production

processing does not necessarily include testing of all parameters.