SN54F109, SN74F109

DUAL J-K POSITIVE-EDGE-TRIGGERED FLIP-FLOPS

WITH CLEAR AND PRESET

SDFS047A – MARCH 1987 – REVISED OCTOBER 1993

Copyright

2–1

POST OFFICE BOX 655303

Small-Outline Packages, Ceramic Chip

Carriers, and Standard Plastic and Ceramic

300-mil DIPs

description

These devices contain two independent J-K

positive-edge-triggered 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 J and K input meeting the

setup-time requirements are 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 J and K inputs may be changed without

affecting the levels at the outputs. These versatile

flip-flops can perform as toggle flip-flops by

grounding K and trying J high. They also can

perform as D-type flip-flops if J and K are tied

together.

The SN54F109 is characterized for operation over

the full military temperature range of – 55

°C to

125

°C. The SN74F109 is characterized for

operation from 0

°C to 70°C.

FUNCTION TABLE

INPUTS

OUTPUTS

PRE

CLR

CLK

J

K

Q

Q

L

H

X

X

X

H

L

H

LX

X

X

L

H

L

LX

X

X

H†

H†

H

H

↑

LL

L

H

H

H

↑

H

L

Toggle

H

H

↑

LH

Q0

Q0

H

H

↑

HH

H

L

H

H

L

X

X

Q0

Q0

† The output levels are not guaranteed to meet the minimum

levels for VOH. Furthermore, thisconfigurationisnonstable;

that is, it will not persist when PRE or CLR returns to its

inactive (high) level.

SN54F109 ...J PACKAGE

SN74F109 ...D OR N PACKAGE

(TOP VIEW)

SN54F109 . . . FK PACKAGE

(TOP VIEW)

32

1 20 19

910 11 12 13

4

5

6

7

8

18

17

16

15

14

2J

2K

NC

2CLK

2PRE

1K

1CLK

NC

1PRE

1Q

NC – No internal connection

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

1CLR

1J

1K

1CLK

1PRE

1Q

1Q

GND

VCC

2CLR

2J

2K

2CLK

2PRE

2Q

2Q

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.