MB88152 Ver la hoja de datos (PDF) - Fujitsu

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MB88152

Spread Spectrum Clock Generator

Fujitsu 

MB88152

s HANDLING DEVICES

Preventing Latchup

A latchup can occur if, on a CMOS IC, a voltage higher than VDD or a voltage lower than VSS is applied to an

input or output pin2 or a voltage higher than the rating is applied between VDD and VSS. A latchup, if it occurs,

significantly increases the power supply current and may cause thermal destruction of an element. When you

use a CMOS IC, be very careful not to exceed the maximum rating.

Handling unused pins

Do not leave an unused input pin open, since it may cause a malfunction. Handle by, for example, using a pull-

up or pull-down resistor.

The attention when the external clock is used

Input the clock to XIN, and don’t connect anything with XOUT you use the external clock.

And please pay attention so that an overshoot and an undershoot do not occur to an input clock of XIN.

Power supply pins

Please connecting to the power supply terminal of this device by as lower impedance as possible from the current

supply source.

We recommend connecting electrolytic capacitor (about 10 µF) and the ceramic capacitor (about 0.01 µF) in

parallel between VSS and VDD near the device, as a by - pass capacitor.

Crystal Oscillator Circuit

Noise near the XIN or XOUT pin may cause the device to malfunction. Design printed circuit boards so that

electric wiring of XIN and XOUT and crystal resonator (or ceramic resonator) don’t intersect other wiring.

It is strongly recommended that printed circuit board artwork that surrounds the XIN and XOUT pins with ground

be used to increase the expectation of stable operation.

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