MB90560/565 Series
(3) Power-On Reset
(TA = −40 °C to +85 °C, VCC = 5.0 V ±10%, VSS = AVSS = 0.0 V)
Value
Condi-
tion
Parameter
Symbol Pin Name
Unit
Remarks
Min.
0.05
4
Max.
Power supply rise time
Power supply cutoff time
tR
VCC
VCC
30
ms
tOFF
ms For repeated operation
* : VCC must be less than 0.2 V before power-on.
Notes : • The above rating values are for generating a power-on reset.
• Some internal registers are only initialized by a power-on reset. Always apply the power supply in
accordance with the above ratings if you wish to initialize these registers.
tR
2.7 V
0.2 V
VCC
0.2 V
0.2 V
tOFF
Sudden changes in the power supply voltage may cause a power-on reset.
The recommended practice if you wish to change the power supply voltage while the device is
operating is to raise the voltage smoothly as shown below. Also, changes to the supply voltage
should be performed when the PLL clock is not in use. The PLL clock may be used, however, if
the rate of voltage change is 1 V/s or less.
VCC
Recommended rate of voltage
rise is 50 mV/ms or less.
3.0 V
Maintain RAM data
VSS
64
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