MB88153A データシートの表示（PDF） - Fujitsu

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MB88153A

Spread Spectrum Clock Generator

Fujitsu 

MB88153A

■ PIN SETTING

When changing the pin setting, the stabilization wait time for the modulation clock required. The stabilization

wait time for the modulation clock takes the maximum value of Lock-Up time in “■ ELECTRICAL CHARACTER-

ISTICS • AC Characteristics”.

ENS modulation enable setting

ENS

L

H

Modulation

No modulation

Modulation

Note : Spectrum does not spread when “L” is set to ENS. The clock with low jitter can be obtained.

FREQ0, FREQ1 frequency setting

FREQ0

FREQ1

Input frequency range

L

L

L

H

H

L

H

H

16.6 MHz to 40 MHz

66 MHz to 134 MHz

33 MHz to 67 MHz

40 MHz to 80 MHz

Note : It is set according to the frequency of the clock input to the device. Set FREQ0 pin to “H” for the pin opened

because FREQ0 pin has pull-up resistor.

XPD power down setting

XPD

L

H

Power down

Power down

Normal operation

Note : When “L” is set to XPD pin, the power down operation is implemented and “L” is output to CKOUT pin. When

“H” is input to XPD pin or XPD pin is opened, normal operation is implemented because the XPD pin has

pull-up resistor.

7

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