MB88154A データシートの表示（PDF） - Cypress Semiconductor

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MB88154A

Spread Spectrum Clock Generator

Cypress Semiconductor 

MB88154A

5. Handling Devices

5.1 Preventing Latch-up

A latch-up can occur if, on this device, (a) a voltage higher than VDD or a voltage lower than VSS is applied to an input or output pin or

(b) a voltage higher than the rating is applied between VDD pin and VSS pin. The latch-up, if it occurs, significantly increases the power

supply current and may cause thermal destruction of an element. When you use this device, be very careful not to exceed the

maximum rating.

5.2 Handling Unused Pins

Do not leave an unused input pin open, since it may cause a malfunction. Handle by, using a pull-up or pull-down resistor.

Unused output pin should be opened.

5.3 The Attention When the External Clock is Used

Input the clock to XIN pin, and XOUT pin should be opened when you use the external clock.

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

5.4 Power Supply Pins

Please design connecting the power supply pin of this device by as low 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

pin and VDD pin near the device, as a bypass capacitor.

5.5 Oscillation Circuit

Noise near the XIN and XOUT pins may cause the device to malfunction. Design printed circuit boards so that electric wiring of XIN

or XOUT pin and the resonator do not intersect other wiring.

Design the printed circuit board that surrounds the XIN and XOUT pins with ground.

Document Number: 002-08252 Rev. *B

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