MB88R157A FUJITSU [Fujitsu Component Limited.], MB88R157A Datasheet - Page 3

• Manufacturer Part Number: MB88R157A
• Description: Spread Spectrum Clock Generator Capable of Freely Setting the Output Clock Frequency
• Manufacturer: FUJITSU [Fujitsu Component Limited.]

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functions and
program.
A dramatic reduction in the number of conventional noise
countermeasure parts, such as shields, beads and capacitors, can
be realized.
Time and man-hours can be reduced dramatically compared
to conventional noise countermeasures that use parts (which
require evaluation and measure/layout change/building and
re-measurement).
Figure 3
New Products
presents the pin assignments,
Table 2
Table 1 Pin Functions
Table 2 Main Setup Functions
※A PC GUI software program to calculate the optimal parameter values in the table is available.
M/N/K divider parameter
L divider parameter
Charge pump current/gain
Modulation degree setting
OUT terminal level
Clock output drive capacity
XIN/XOUT terminal oscillation stability
capacity value
SS/PLL mode
the parameters that can be set through the
Pin code
XOUT
OUT
VDD
VSS
XIN
OE
SP
VF
Functions set by the program
I/O
I/O
−
−
O
O
I
I
I
Table 1
端子番号
MB88R157A
1
2
3
4
5
6
7
8
the pin
Connection terminal for crystal oscillator
Output enable terminal
Serial program terminal
GND terminal
Clock output terminal
Variable function terminal
＊ Modulation enable, power down control, Hi or Low output can be
Power supply voltage terminal
Connection terminal/clock input for crystal oscillator
The multiplication rate for output clock frequency can be set.
Modulation cycle can be set.
An optimal value can be set for PLL oscillation frequency.
The degree of modulation can be selected in units of 0.25% from
modulation off, ±0.25% to ±1.75% .
OUT terminal status can be set at L output or Hi-Z when OE
terminal = L.
The drive capacity for OUT terminal can be selected (2 stages).
The built-in oscillation stability capacity can be set in units of
0.039pF from 5pF to 10pF each.
Whether or not SS functions are used or the highly precise PLL
mode is used can be selected.
set depending on the setting in the memory.
Evaluation Board and FRAM
Writing Environment
For this product, we offer an evaluation board and writing
environment with a built-in LSI to simplify single unit evaluation
and property check. We also offer a GUI program to enable the
simple calculation of the parameter data to be programmed as the
FRAM writing environment.
environment.
Figure 4
Description of function
Function details
presents an example of a connection to a writing
2010
No.3
FIND Vol.28