MB90480/485 Series
(4) Power-on Reset Standards
(VCC = 2.7 V to 3.6 V, VSS = 0.0 V, TA = −40 °C to +85 °C)
Value
Parameter
Symbol Pin name Conditions
Unit
Remarks
Min
0.05
1
Max
30
Power rise time
tR
VCC
VCC
ms
*
⎯
Power down time
tOFF
⎯
ms In repeated operation
* : Power rise time requires VCC < 0.2 V.
Notes: • The above standards are for the application of a power-on reset.
• Within the device, the power-on reset should be applied by switching the power supply off and on again.
tR
2.7 V
VCC
0.2 V
0.2 V
0.2 V
t
OFF
Note : Rapid fluctuations in power supply voltage may trigger a power-on reset in some cases. As shown below,
when changing supply voltage during operation, it is recommended that voltage changes be suppressed
and a smooth restart be applied.
Main power supply voltage
V
CC
The slope of voltage increase
should be kept within 50 mV/ms.
Sub power supply voltage
RAM data maintenance
V
SS
94
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