FS8170

Page 7

July 2005

Fig. 1 – Serial data input waveforms

t

SU1

t

SU2

t

HOLD1

DATA

CLK

LE

DATA

CLK

LE

18 17 16 15 14 13 12 11 10 9 8

7654

3

19

21

Parameter

Min.

Typ.

Max.

Unit

t

SU1

10

–

–

ns

t

SU2

20

–

–

ns

t

HOLD1

10

–

–

ns

CB

Control bit for selecting the 0:N or 1: R latch

A1 to A7

Control bits for setting the divide ratio of the programmable swallow counter (0 to 127)

N1 to N11

Control bits for setting the divide ratio of the programmable main counter (3 to 2047)

R1 to R14

Control bits for setting the divide ratio of the programmable reference counter (3 to 16383)

SW

Control bit for setting the divide ratio of the prescaler (32/33 or 64/65)

FC

Control bit for setting the polarity of the phase/frequency detector

LDS

Control bit for selecting the output for the FOLD pin

CS

Control bit for setting the charge pump current level

Table 1: Serial data input format

12345678

9

10

11

12

13

14

15

16

17

18

19

C

B

A

1

A

2

A

3

A

4

A

5

A

6

A

7

N

1

N

2

N

3

N

4

N

5

N

6

N

7

N

8

N

9

N

10

N

11

R

1

R

2

R

3

R

4

R

5

R

6

R

7

R

8

R

9

R

10

R

11

R

12

R

13

R

14

S

W

F

C

L

D

S

C

S

MSB

LSB