MB1507 Fujitsu Microelectronics, Inc., MB1507 Datasheet - Page 5

• Manufacturer Part Number: MB1507
• Description: Serial Input PLL Frequency Synthesizer
• Manufacturer: Fujitsu Microelectronics, Inc.

PROGRAMMABLE DIVIDER
Programmable divider consists of 20-bit shift register, 19-bit latch, 8-bit swallow counter and 11-bit programmable counter.
Serial 20-bit data format is shown below.
8-BIT SWALLOW COUNTER DIVIDE RATIO
11-BIT PROGRAMMABLE COUNTER DIVIDE RATIO
NOTE:
NOTES: Divide ratio less than 16 is prohibited.
C
Divide
Divide
Ratio
Ratio
2047
255
16
17
N
A
0
1
S
1
Divide ratio: 0 to 255
Divide ratio: 16 to 2047
S1 to S8: Swallow counter divide ratio setting bit. (0 to 255)
S9 to S19: Programmable counter divide ratio setting bit. (16 to 2047)
C: Control bit (sets to low level).
Data is input from MSB side.
19
S
S
S
2
8
0
0
1
0
0
1
Divide ratio of swallow counter
Control bit
LSB
18
S
S
S
3
7
0
0
1
0
0
1
setting bit
17
S
S
S
4
6
0
0
1
0
0
1
16
S
S
S
5
5
0
0
1
0
0
1
15
S
S
S
6
4
0
0
1
0
0
1
14
S
S
S
7
3
0
0
1
0
0
1
13
S
8
S
2
0
0
1
S
1
1
1
12
S
S
S
9
1
0
1
1
0
0
1
10
11
S
S
0
0
1
11
10
S
S
Divide ratio of programmable counter
0
0
1
12
S
S
9
0
1
1
13
S
setting bit
14
S
15
S
16
S
MSB
17
S
18
S
19
S
MB1507
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