MB90F334APMC datasheet(47/72 Pages) FUJITSU

47 / 72 page

MB90330A Series

DS07-13734-7E

(4) Power-on reset

(VCC

= AVCC = 3.3 V ± 0.3 V, VSS = AVSS = 0.0 V, TA = − 40 °C to +85 °C)

Notes :

• VCC must be lower than 0.2 V before the power supply is turned on.

• The above standard is a value for performing a power-on reset.

• In the device, there are internal registers which is initialized only by a power-on reset.

When the initialization of these items is expected, turn on the power supply according to the standards.

• Sudden change of power supply voltage may activate the power-on reset function.

When changing the power supply voltage during operation as illustrated below, voltage fluctuation should

be minimized so that the voltage rises as smoothly as possible. When raising the power, do not use PLL

clock. However, if voltage drop is 1 V/s or less, use of PLL clock is allowed during operation.

Parameter

Symbol Pin name Conditions

Value

Unit

Remarks

Min

Max

Power supply rising

time

VCC

⎯

0.05

Power supply shutdown

time

tOFF

VCC

⎯

Waiting time until

power-on

VCC

0.2 V

2.7 V

tOFF

0.2 V

VCC

3.0 V

VSS

RAM data hold

The rising edge should be 50 mV/ms

or less.

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