MB90F438LPF datasheet(39/61 Pages) CYPRESS

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MB90435 Series

DS07-13727-2E

(4) Power On Reset

(MB90F438L (S) /437L (S) /438L (S) : VCC

= 3.5 V to 5.5 V, VSS = AVSS = 0.0 V, TA = −40 °C to +105 °C)

(MB90F439 (S) /439 (S) /V540G : VCC

= 5.0 V ± 10%, VSS = AVSS = 0.0 V, TA = −40 °C to +105 °C)

* : VCC must be kept lower than 0.2 V before power-on.

Notes :

• The above values are used for creating a power-on reset.

• Some registers in the device are initialized only upon a power-on reset. To initialize these register, turn on

the power supply using the above values.

Parameter

Symbol

name

Condition

Value

Units

Remarks

Min

Max

Power on rise time

VCC

⎯

0.05

Power off time

tOFF

VCC

⎯

Due to repetitive operation

VCC

VSS

3.0 V

tOFF

2.7 V

0.2 V

RAM data being held

It is recommended to keep the

rising speed of the supply voltage

at 50 mV/ms or slower.

Sudden changes in the power supply voltage may cause a power-on reset.

To change the power supply voltage while the device is in operation, it is recommended to

raise the voltage smoothly to suppress fluctuations as shown below.

In this case, change the supply voltage with the PLL clock not used. If the voltage drop is

1 V or fewer per second, however, you can use the PLL clock.

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