SN54ABT377, SN74ABT377

OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS

WITH CLOCK ENABLE

SCBS156B – FEBRUARY 1991 – REVISED JULY 1994

Copyright

2–1

POST OFFICE BOX 655303

Significantly Reduces Power Dissipation

Per JEDEC Standard JESD-17

Small-Outline (DW) and Shrink

Small-Outline (DB) Packages, Ceramic

Chip Carriers (FK), and Plastic (N) and

Ceramic (J) DIPs

description

The

′ABT377 are 8-bit positive-edge-triggered

D-type flip-flops with a clock (CLK) input. They are

particularly suitable for implementing buffer and

storage registers, shift registers, and pattern

generators.

Data (D) input information that meets the setup

time requirements is transferred to the Q outputs

on the positive-going edge of the clock pulse if the

common clock-enable (CLKEN) input is low. Clock

triggering occurs at a particular voltage level and

is not directly related to the transition time of the

positive-going pulse. When the buffered clock

(CLK) input is at either the high or low level, the

D input signal has no effect at the output. The

circuits are designed to prevent false clocking by

transitions at CLKEN.

The SN74ABT377 is available in TI’s shrink small-outline package (DB), which provides the same I/O pin count

and functionality of standard small-outline packages in less than half the printed-circuit-board area.

The SN54ABT377 is characterized for operation over the full military temperature range of – 55

°C to 125°C. The

SN74ABT377 is characterized for operation from – 40

°C to 85°C.

FUNCTION TABLE

(each flip-flop)

INPUTS

OUTPUT

CLKEN

CLK

D

Q

H

X

X

Q0

L

↑

HH

L

↑

LL

X

H or L

X

Q0

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

CLKEN

1Q

1D

2D

2Q

3Q

3D

4D

4Q

GND

8Q

8D

7D

7Q

6Q

6D

5D

5Q

CLK

SN54ABT377 ...J PACKAGE

SN74ABT377 ... DB, DW, OR N PACKAGE

(TOP VIEW)

32

1 20 19

9 10 11 12 13

4

5

6

7

8

18

17

16

15

14

2D

2Q

3Q

3D

4D

SN54ABT377 . . . FK PACKAGE

(TOP VIEW)

8D

7D

7Q

6Q

6D

EPIC-

ΙΙB is a trademark of 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.