Philips Semiconductors

Product specification

74F398*,74F399

Registers

1999 Jan 08

3

* Discontinued part. Please see the Discontinued Products List..

LOGIC SYMBOL – 74F398

11

1

S

CP

23

9

8

Qa

Qa

Qb

Qb

SF00948

VCC = Pin 20

GND = Pin 10

57

6

14

I1a

I0b

I1b

I0c

4

I0a

15

17

16

12

13

19

18

Qc

Qc

Qd

Qd

I1c

I0d

I1d

IEC/IEEE SYMBOL (IEEE/IEC) – 74F398

SF00949

4

7

6

14

G1

1, 2D

1

11

MUX

3

9

8

C2

1, 2D

5

2

15

17

16

13

19

18

12

LOGIC SYMBOL – 74F399

9

1

S

CP

27

Qa

Qb

SF00952

VCC = Pin 16

GND = Pin 8

46

5

11

I1a

I0b

I1b

I0c

3

I0a

12

14

13

10

15

Qc

Qd

I1c

I0d

I1d

IEC/IEEE SYMBOL (IEEE/IEC) – 74F399

SF00953

3

6

5

11

G1

1, 2D

1

9

MUX

7

C1

1, 2D

4

2

12

14

13

15

10

FUNCTION TABLE

INPUTS

OUTPUTS

CP

S

I0n

I1n

Qn

Qn (74F398 only)

"

l

l

X

L

H

"

l

h

X

H

L

"

h

X

l

L

H

"

h

X

h

H

L

H = High voltage level

h

= High voltage level one setup time prior to the High-to-Low

clock transition

L

= Low voltage level

l

= Low voltage level one setup time prior to the High-to-Low

clock transition

X = Don’t care

" = Low-to-High clock transition