MB9B520M datasheet(47/113 Pages) SPANSION

47 / 113 page

D a t a S h e e t

MB9B520M_DS706-00048-3v0-E, March 18, 2015

CONFIDENTIAL

 Handling Devices

 Power supply pins

In products with multiple VCC and VSS pins, respective pins at the same potential are interconnected

within the device in order to prevent malfunctions such as latch-up. However, all of these pins should be

connected externally to the power supply or ground lines in order to reduce electromagnetic emission levels,

to prevent abnormal operation of strobe signals caused by the rise in the ground level, and to conform to the

total output current rating.

Moreover, connect the current supply source with each Power supply pin and GND pin of this device at low

impedance. It is also advisable that a ceramic capacitor of approximately 0.1 µF be connected as a bypass

capacitor between each Power supply pin and GND pin, between AVCC pin and AVSS pin, between AVRH

pin and AVRL pin near this device.

 Stabilizing power supply voltage

A malfunction may occur when the power supply voltage fluctuates rapidly even though the fluctuation is

within the recommended operating conditions of the VCC power supply voltage. As a rule, with voltage

stabilization, suppress the voltage fluctuation so that the fluctuation in VCC ripple (peak-to-peak value) at

the commercial frequency (50 Hz/60 Hz) does not exceed 10% of the VCC value in the recommended

operating conditions, and the transient fluctuation rate does not exceed 0.1 V/μs when there is a momentary

fluctuation on switching the power supply.

 Crystal oscillator circuit

Noise near the X0/X1 and X0A/X1A pins may cause the device to malfunction. Design the printed circuit

board so that X0/X1, X0A/X1A pins, the crystal oscillator, and the bypass capacitor to ground are located as

close to the device as possible.

It is strongly recommended that the PC board artwork be designed such that the X0/X1 and X0A/X1A pins

are surrounded by ground plane as this is expected to produce stable operation.

Evaluate oscillation of your using crystal oscillator by your mount board.

 Sub crystal oscillator

This series sub oscillator circuit is low gain to keep the low current consumption. The crystal oscillator to

fill the following conditions is recommended for sub crystal oscillator to stabilize the oscillation.

・ Surface mount type

Size : More than 3.2 mm × 1.5 mm

Load capacitance : Approximately 6 pF to 7 pF

・ Lead type

Load capacitance : Approximately 6 pF to 7 pF

MB9B520M датащи(PDF) 47 Page - SPANSION