MB90F337 datasheet(35/48 Pages) FUJITSU

35 / 48 page

MB90335 Series

DS07-13735-6E

(3) Power-on reset

(VCC

= 3.3 V ± 0.3 V, VSS = 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.

Note : 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

1.8 V

VSS

RAM data hold

The rising edge should be 50 mV/ms

or less.

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