SN54HCT273, SN74HCT273

OCTAL D-TYPE FLIP-FLOPS

WITH CLEAR

SCLS068C – NOVEMBER 1988 – REVISED MAY 1997

1

POST OFFICE BOX 655303

– Buffer/Storage Registers

– Shift Registers

– Pattern Generators

Small-Outline (DW) and Ceramic Flat (W)

Packages, Ceramic Chip Carriers (FK), and

Standard Plastic (N) and Ceramic (J)

300-mil DIPs

description

These devices are positive-edge-triggered D-type

flip-flops with a common enable input. The

’HCT273 are similar to the ’HCT377, but feature

a common clear enable (CLR) input instead of a

latched clock.

Information at the data (D) inputs meeting the

setup time requirements is transferred to the

Q outputs on the positive-going edge of the clock

(CLK) pulse. Clock triggering occurs at a

particular voltage level and is not directly related

to the positive-going pulse. When CLK is at either

the high or low level, the D input has no effect at

the output. The circuits are designed to prevent

false clocking by transitions at CLR.

The SN54HCT273 is characterized for operation over the full military temperature range of –55

°C to 125°C. The

SN74HCT273 is characterized for operation from –40

°C to 85°C.

FUNCTION TABLE

(each flip-flop)

INPUTS

OUTPUT

CLR

CLK

D

Q

L

X

X

L

H

↑

HH

H

↑

LL

H

L

X

Q0

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

CLR

1Q

1D

2D

2Q

3Q

3D

4D

4Q

GND

8Q

8D

7D

7Q

6Q

6D

5D

5Q

CLK

SN54HCT273 ...J OR W PACKAGE

SN74HCT273 ...DW, N, OR PW PACKAGE

(TOP VIEW)

3

2120 19

910 11 12 13

4

5

6

7

8

18

17

16

15

14

8D

7D

7Q

6Q

6D

2D

2Q

3Q

3D

4D

SN54HCT273 . . . FK PACKAGE

(TOP VIEW)

Copyright

© 1997, Texas Instruments Incorporated

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.

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.