12

SY89531L

Micrel, Inc.

M9999-110405

hbwhelp@micrel.com or (408) 955-1690

Rate

FSEL

MSEL

XTAL

Protocol

(MHz)

(Post Divider)

(Feedback Div.)

(MHz)

FOUT

PCI

33

18

36

16.67

33

Fast Ethernet

100

6

40

15

100

1/8 FC

133

6

52

15.36

133

ESCON

200

4

50

16

200

Note 1.

600MHz < (XTAL x MSEL) < 1000MHz.

Note 2.

Where two settings provide the user with the identical desired frequency, the setting with the higher input reference frequency (and lower

feedback divider) will usually have lower output jitter. However, the reference input frequency, as well as the VCO frequency, must be kept

within their respective ranges.

FOUT

XTAL MSEL

FSEL

=

×

()

M3

M2

M1

M0

0000

Ref

× 34

0001

Ref

× 36

0010

Ref

× 38

0011

Ref

× 40

0100

Ref

× 42

0101

Ref

× 44

0110

Ref

× 48

0111

Ref

× 50

1000

Ref

× 52

1001

Ref

× 54

1010

Ref

× 56

1011

Ref

× 60

1100

Ref

× 62

1101

Ref

× 66

1110

Ref

× 70

1111

Ref

× 72

Note 1.

Ref = Crystal Frequency.

FEEDBACK DIVIDE SELECT TABLE (MSEL)