MB88155 데이터 시트보기 (PDF) - Fujitsu

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MB88155

Spread Spectrum Clock Generator

Fujitsu 

MB88155

(Continued)

XIN

VIH

ENS

tLK (Lock-up time)

CKOUT

VIL

tLK (Lock-up time)

If the ENS pin is used for modulation enable control during normal operation, the set clock signal is output from the

CKOUT pin at most the lock-up time “tLK” after the level at the ENS pin is determined.

Note : The wait time for the clock signal output from the CKOUT pin to become stable is required after the IC is

released from power-down mode by the XPD pin or after another pin’s setting is changed. During the period

until the output clock signal becomes stable, neither of the output frequency, output clock duty cycle, mod-

ulation period, and cycle-cycle jitter characteristic cannot be guaranteed. It is therefore advisable to take

action, such as cancelling a device reset at the stage after the lock-up time has passed.

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