4-192

FAST AND LS TTL DATA

QUAD 2-PORT REGISTER

The MC54/74F399 is the logical equivalent of a quad 2-input multiplexer

feeding into four edge-triggered flip flops. A common Select input determines

which of the two 4-bit words is accepted. The selected data enters the flip-

flops on the rising edge of the clock. The MC54/74F399 is the 16-pin version

of the MC54/74F398, with only the Q outputs of the flip-flops available.

6

7

8

1

2

3

4

5

10

11

13

14

12

9

15

16

VCC

Qd

I0d

I1d

I1c

Qc

I0c

I0a

S

Qa

I1a

I1b

Qb

I0b

CONNECTION DIAGRAM (TOP VIEW)

CP

GND

LOGIC DIAGRAM

NOTE:

This diagram is provided only for the understanding of logic operations and

should not be used to estimate propagation delays.

D

CP

Qa

Qb

Qc

Qd

I0a

S

I1a

I0b

I1b

I0c

I1c

I0d

I1d

CP

D

CP

D

CP

D

CP

J SUFFIX

CERAMIC

CASE 620-09

N SUFFIX

PLASTIC

CASE 648-08

16

1

16

1

ORDERING INFORMATION

MC54FXXXJ

Ceramic

MC74FXXXN

Plastic

MC74FXXXD

SOIC

16

1

D SUFFIX

SOIC

CASE 751B-03

LOGIC SYMBOL

QUAD 2-PORT REGISTER

FAST

™ SCHOTTKY TTL

MC54/74F399

I0a I1a I0b I1b I0c I1c I0d I1d

S

CP

Qa

Qb

Qc

Qd

3

4

6

5 11 12 14 13

2

7

10

15

1

9

VCC = PIN 16

GND = PIN 8