FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-29120-1E
Spread Spectrum Clock Generator
MB88156
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DESCRIPTION
MB88156 is a clock generator for EMI (Electro Magnetic Interference) reduction. The peak of unnecessary radi-
ation noise (EMI) can be attenuated by making the oscillation frequency slightly modulate periodically with the
internal modulator. The modulation corresponds to the center spread and down spread. The multiplication ratio
can be changed by the pin setting.
Also, the pin can be set whether the modulation is changed. For no modulation, it has the center-non-spread to
fix to the output frequency conforming to the multiplication setting and down-non-spread to fix the output frequency
to center frequency of the down spread.
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FEATURES
• Input frequency :
12.5 MHz to 50 MHz (multiplied by 1)
12.5 MHz to 25 MHz (multiplied by 2)
12.5 MHz to 20 MHz (multiplied by 4)
CKOUT 12.5 MHz to 80 MHz
REFOUT the same as input frequency (not multiplied)
(Continued)
• Output frequency :
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PACKAGE
16-pin plastic BCC
(LCC-16P-M09)
FUJITSU [ FUJITSU COMPONENT LIMITED. ]
