SN54AHCT574, SN74AHCT574

OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS

WITH 3-STATE OUTPUTS

SCLS245J – OCTOBER 1995 – REVISED JANUARY 2000

1

POST OFFICE BOX 655303

CMOS) Process

JESD 17

MIL-STD-883, Method 3015; Exceeds 200 V

Using Machine Model (C = 200 pF, R = 0)

Small-Outline (DW), Shrink Small-Outline

(DB), Thin Very Small-Outline (DGV), Thin

Shrink Small-Outline (PW), and Ceramic

Flat (W) Packages, Ceramic Chip Carriers

(FK), and Standard Plastic (N) and Ceramic

(J) DIPs

description

The ’AHCT574 devices are octal edge-triggered

D-type flip-flops that feature 3-state outputs

designed specifically for driving highly capacitive

or relatively low-impedance loads. These devices

are particularly suitable for implementing buffer

registers, I/O ports, bidirectional bus drivers, and

working registers.

On the positive transition of the clock (CLK) input,

the Q outputs are set to the logic levels of the data

(D) inputs.

A buffered output-enable (OE) input places the eight outputs in either a normal logic state (high or low) 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 the increased drive provide the capability to drive bus lines without interface or

pullup components.

OE does not affect internal operations of the flip-flop. Old data can be retained or new data can be entered while

the outputs are in the high-impedance state.

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

The SN54AHCT574 is characterized for operation over the full military temperature range of –55

°C to 125°C.

The SN74AHCT574 is characterized for operation from –40

°C to 85°C.

Copyright

© 2000, 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.

EPIC is a trademark of Texas Instruments Incorporated.

SN54AHCT574 ...J OR W PACKAGE

SN74AHCT574 . . . DB, DGV, DW, N, OR PW PACKAGE

(TOP VIEW)

SN54AHCT574 . . . FK 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

32 1 20 19

910 11 12 13

4

5

6

7

8

18

17

16

15

14

2Q

3Q

4Q

5Q

6Q

3D

4D

5D

6D

7D

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.