DS07-16301-4E Datasheet, PDF (74/99 Pages) Fujitsu Component Limited. – 32-bit RISC Microcontroller CMOS FR30 Series

MB91101/MB91101A
(4) Power on Supply Specifications (Power-on Reset)
(VCC5 = 5.0 V ±10%, VSS = AVSS = 0.0 V, TA = –40°C to +70°C)
(VCC5 = VCC3 = 2.7 V to 3.6 V, VSS = AVSS = 0.0 V, TA = –40°C to +70°C)
Parameter
Symbol Pin name Condition
Value
Min
Max
Unit Remarks
tR
tR
Power supply rising time
tR
tR
VCC
50
VCC = 5.0 V
VCC
—
VCC
50
VCC = 3.0/3.3 V
VCC
—
—
µs *
30
ms *
—
µs *
18
ms *
Power supply shut off time tOFF
VCC
—
1
—
ms
Repeated
operations
tC (clock cycle time): Refer to “(1) Clock Timing Rating.”
*: VCC < 0.2 V before the power supply rising
tR
VCC
0.9 × VCC5
0.2 V
tOFF
Note: Sudden change in supply voltage during operation may initiate a power-on sequence.
To change supply voltage during operation, it is recommended to smoothly raise the voltage to avoid rapid
fluctuations in the supply voltage.
VCC
A voltage rising rate of 50 mV/ms or
less is recommended.
VSS
42 ms approx.
Regulator
VCC
Stabilizing time *
RST
0.2 × VCC5
tRSTL + (tC × 2¹⁹)
tRSTL: Reset input time
*: Reset can’t be done during regulator stabilizing time.
Note: Set RST pin to “L” level when turning on the device, at least the described above duration after the
supply voltage reaches Vcc is necessary before turning the RST to “H” level.
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