
31
MB90F244
(4) Power-on Reset
(AV
SS
= V
SS
= 0.0 V, T
A
= 0
°
C to +70
°
C)
Value
Unit
Min.
Max.
* :Before the power supply rising, V
CC
must be lower than 0.2 V.
Note: The above standards are the values needed in order to activate a power-on reset.
Parameter
Symbol
Pin name
Condition
Remarks
Power supply rising time
t
R
V
CC
, V
CC
5
—
—
30
ms
*
Power supply cut-off time
t
OFF
V
CC
, V
CC
5
1
—
ms
t
R
V
CC
2.1 V
0.2 V
t
OFF
0.2 V
0.2 V
V
CC
3.3 V
3.0 V
V
SS
If power supply voltage needs to be changed in the course of operation, a smooth voltage rise is
recommended by suppressing the voltage variation as shown below.
It is recommended that the rate of
increase in the voltage be kept to
no more than 50 mV/ms.
Hold RAM data