SN54F374, SN74F374

OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS

WITH 3-STATE OUTPUTS

SDFS077A – D2932, MARCH 1987 – REVISED OCTOBER 1993

Copyright

2–1

POST OFFICE BOX 655303

Small-Outline (SOIC) and Shrink

Small-Outline (SSOP) Packages, Ceramic

Chip Carriers, and Plastic and Ceramic

DIPs

description

These 8-bit flip-flops feature 3-state outputs

designed specifically for driving highly capacitive

or relatively low-impedance loads. They are

particularly suitable for implementing buffer

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

working registers.

The eight flip-flops of the

′F374 are edge-triggered

D-type flip-flops. On the positive transition of the

clock (CLK) input, the Q outputs are set to the logic

levels that were set up at the data (D) inputs.

A buffered output enable (OE) input can be used

to place the eight outputs in either a normal logic

state (high or low) or a 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

need for interface or pullup components.

The output enable (OE) input 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.

The SN74F374 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 SN54F374 is characterized for operation over the full military temperature range of – 55

°C to 125°C. The

SN74F374 is characterized for operation from 0

°C to 70°C.

FUNCTION TABLE

(each flip-flop)

INPUTS

OUTPUT

OE

CLK

D

Q

L

↑

H

H

L

↑

LL

L

H or L

X

Q0

H

X

X

Z

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

OE

1Q

1D

2D

2Q

3Q

3D

4D

4Q

GND

8Q

8D

7D

7Q

6Q

6D

5D

5Q

CLK

SN54F374 ...J PACKAGE

SN74F374 ... DB, DW, OR N PACKAGE

(TOP VIEW)

3

2

1 20 19

9 10 11 12 13

4

5

6

7

8

18

17

16

15

14

2D

2Q

3Q

3D

4D

SN54F374 . . . FK PACKAGE

(TOP VIEW)

8D

7D

7Q

6Q

6D

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.