mb90f377pff-g Fujitsu Microelectronics, Inc., mb90f377pff-g Datasheet - Page 120
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mb90f377pff-g
Manufacturer Part Number
mb90f377pff-g
Description
16-bit Proprietary Microcontroller
Manufacturer
Fujitsu Microelectronics, Inc.
Datasheet
1.MB90F377PFF-G.pdf
(140 pages)
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120
MB90370/375 Series
* : V
Notes : The above values are used for causing a power-on reset.
(3) Power-on Reset
Power supply rise time
Power supply cut-off time
CC
must be kept lower than 0.2 V before power-on.
1.8 V
Parameter
V
V
V
Some registers in the device are initialized only upon a power-on reset. To initialize these registers, turn
on the power supply using the above values.
Make sure that power supply rises within the selected oscillation stabilization time. If the power supply
voltage needs to be varied in the course of operation, a smooth voltage rise is recommended.
CC
CC
SS
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 recommneded
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.
0.2 V
(V
Symbol Pin name Condition
CC
t
OFF
t
R
AV
CC
2.2 V
t
R
V
V
CV
CC
CC
RAM data hold
CC
*
*
3.0 V to 3.6 V, V
0.2 V
Min
SS
1
Value
AV
SS
Max
50
t
CV
OFF
It is recommended to keep
the rising speed of the supply
voltage at 50 mV/ms or slower.
SS
Unit
0.0 V, T
ms
ms
0.2 V
Due to repeated
operations
A
40 C to 85 C)
Remarks
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