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FS8170
Page 7
May 2003
Fig. 1 – Serial data input waveforms
t
SU1
t
SU2
t
HOLD1
DATA
CLK
LE
DATA
CLK
LE
234
5678
9 10 11 12 13 14 15 16 17
1
18 19
Parameter
Min.
Typ.
Max.
Unit
t
SU1
10
–
–
ns
t
SU2
20
–
–
ns
t
HOLD1
10
–
–
ns
CB
Control bit for selecting the N or R latch
A1 to A7
Control bits for setting the divide ratio of the programmable swallow counter (0 to 127)
B1 to B11
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
123456789
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
Data Flow
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