MK74CB44

Quad 1 to 4 Buffalo™ Clock Driver

MDS 74CB44 B

2

Revision 022000

Printed 11/17/00

Integrated Circuit Systems, Inc. • 525 Race St. • San Jose • CA • 95126 • (408)295-9800tel • www.icst.com

PRELIMINARY INFORMATION

Number

Name

Type

Description

1

INA

I

Clock input for four A outputs.

2, 3, 4

QA0, QA1, QA2

O

Clock A outputs.

5, 6

VDD

P

Power supply. Connect to +3.3 V or +5 V. Must be the same as pins 23, 24.

7

QA3

O

Clock A output.

8

QB0

o

Clock B output.

9, 10

GND

P

Connect to ground.

11, 12, 13 QB1, QB2, QB3

O

Clock B outputs.

14

INB

I

Clock input for four B outputs.

15

INC

I

Clock input for four C outputs.

16, 17, 18 QC3, QC2, QC1

O

Clock C outputs.

19, 20

GND

P

Connect to ground.

21

QC0

O

Clock C output.

22

QD3

O

Clock D output.

23, 24

VDD

P

Power supply. Connect to +3.3 V or +5 V. Must be the same as pins 5, 6.

25, 26, 27 QD2, QD1, QD0

O

Clock D outputs.

28

IND

I

Clock input for four D outputs.

Pin Descriptions

Type: I = Input, O = output, P = power supply connection

Pin Assignment

1

8

9

2

3

4

5

6

7

10

11

12

13

14

QA0

QA1

QA2

QA3

QB0

QB1

QB3

QB2

INA

GND

GND

INB

VDD

VDD

QD0

QD1

QD2

QD3

QC0

QC1

QC3

QC2

IND

GND

GND

INC

VDD

VDD

16

15

17

18

19

20

21

22

23

24

25

28

27

26

Suggested Layout

V

G

G

V

For simplicity,series terminating resistors (required) are not

shown for the outputs, but should be placed as close to the

device as possible. It is most critical to have the 0.01µF

decoupling capacitors closest.

V = connect to VDD

= connect to GND

G

0.01µF

0.01µF