LC87F2708A_09 Datasheet, PDF (15/21 Pages) Sanyo Semicon Device – FROM 8K byte, RAM 512 byte on-chip 8-bit 1-chip Microcontroller

LC87F2708A
Power-on Reset (POR) Characteristics at Ta = -40 to +85°C, VSS1 = 0V
Specification
Parameter
Symbol
Pin/Remarks
Conditions
Option selected
min
typ
max
unit
voltage
POR release
voltage
PORRL
• Option selected
• See Fig. 6.
(Note 8-1)
2.87V
3.86V
4.35V
2.75
2.87
2.99
3.73
3.86
3.99
4.21
4.35
4.49
V
Detection voltage
unknown state
POUKS
• See Fig. 6
(Note 8-2)
0.7
0.95
Power supply rise
time
PORIS
Power startup time from
VDD=0V to 2.8V.
100
ms
Note 8-1: The POR release voltage can be selected from three levels when the low-voltage detection feature is
deselected.
Note 8-2: There is an unpredictable period before the power-on reset transistor starts to turn on.
Low Voltage Detection Reset (LVD) Characteristics at Ta = -40 to +85°C, VSS1 = 0V
Parameter
LVD reset Voltage
(Note 9-2)
LVD voltage
hysteresis
Symbol
LVDET
LVHYS
Pin/Remarks
Conditions
• Option selected.
• See Fig. 7.
(Note 9-1)
(Note 9-3)
Option selected
voltage
2.81V
3.79V
4.28V
2.81V
3.79V
min
2.71
3.69
4.18
Specification
typ
max
unit
2.81
2.91
3.79
3.89
V
4.28
4.38
60
65
mV
4.28V
65
Detection voltage
unknown state
LVUKS
• See Fig. 7.
(Note 9-4)
0.7
0.95
V
Minimum low voltage tLVDW
• LVDET-0.5V
detection width
• See Fig. 8.
0.2
ms
(response sensitivity)
Note 9-1: The LVD reset voltage can be selected from three levels when the low-voltage detection feature is selected.
Note 9-2: The hysteresis voltage is not included in the LVD reset voltage value.
Note 9-3: There are cases when the LVD reset voltage value is exceeded when a greater change in the output level or
large current is applied to the port.
Note 9-4: There is an unpredictable period before the low-voltage detection resetting transistor starts to run.
No.A1335-15/21