MB9BF412R datasheet(57/121 Pages) SPANSION

57 / 121 page

D a t a S h e e t

MB9B410R-DS706-00026-3v0-E, March 11, 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 pins and GND pins 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 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 (or ceramic 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.

 Using an external clock

When using an external clock, the clock signal should be input to the X0, X0A pin only and the X1, X1A

pin should be kept open.

 Handling when using Multi-function serial pin as I

2C pin

If it is using multi-function serial pin as I

2C pins, P-ch transistor of digital output is always disable.

However, I

2C pins need to keep the electrical characteristic like other pins and not to connect to external I2C

bus system with power OFF.

 Example of Using an External Clock

Device

X0(X0A)

X1(X1A)

Open

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