MB90F548GLSPF datasheet(48/70 Pages) CYPRESS

48 / 70 page

Document Number: 002- 07696 Rev. *A

Page 48 of 70

MB90540G/545G Series

11.4.4 Power On Reset

(MB90543G(S)/547G(S)/548G(S)/F548GL(S): VCC

 3.5 V to 5.5 V, V

 AV

 0.0 V, T

  40 C to  105 C)

(Other than MB90543G(S)/547G(S)/548G(S)/F548GL(S): VCC

 5.0 V  10, V

 AV

 0.0 V, T

  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

Pin name

Condition

Value

Units

Remarks

Min

Max

Power on rise time

VCC



0.05

Power off time

tOFF

VCC



Waiting time until power-on

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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