MB1501 Fujitsu, MB1501 Datasheet - Page 5

• Manufacturer Part Number: MB1501
• Description: SERIAL INPUT PLL FREQUENCY SYNTHESIZER
• Manufacturer: Fujitsu

FUNCTIONAL DESCRIPTIONS
PROGRAMMABLE DIVIDER
Programmable divider consists of 19-bit shift register, 18-bit latch, 7-bit swallow counter and 11-bit programmable counter.
Serial 19-bit data format is shown below.
S
S
C: Control bit (Control bit is set to low.)
Dara is input from MSB data.
8
1
Divide ratio A : 0 to 127
to S
to S
Last data input
Divide
ratio
127
7-BIT SWALLOW COUNTER DIVIDE RATIO
A
18
7
0
1
: Divide ratio of swallow counter setting bits (0 to 127)
:Divide ratio of programmable counter setting bits (16 to 2047)
C
S
7
0
0
1
S
1
Divide ratio of swallow counter
S
0
0
1
6
S
2
Control bit
LSB
S
5
0
0
1
S
3
setting bits
S
4
0
0
1
S
4
S
3
0
0
1
S
5
S
2
0
0
1
S
6
S
1
0
1
1
S
7
Divide ratio less than 16 is prohibited.
Divide ratio N : 16 to 2047
Data input
Divide
2047
S
8
ratio
11-BIT PROGRAMMABLE COUNTER DIVIDE RATIO
16
17
N
S
9
Divide ratio of programmable counter
18
S
0
0
1
10
S
17
S
0
0
1
11
S
16
S
0
0
1
12
S
setting bits
15
S
0
0
1
13
S
14
S
0
0
1
14
S
13
S
0
0
1
15
S
12
S
1
1
1
16
S
MSB
11
S
0
0
1
17
First data input
S
10
S
0
0
1
18
S
MB1501
MB1501H
MB1501L
S
9
0
0
1
S
8
0
1
1
5