MB9B210T datasheet(64/137 Pages) SPANSION

64 / 137 page

D a t a S h e e t

February 10, 2015, MB9B210T-DS706-00015-3v0-E

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 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 pins and GND pins, 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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