Power-On Reset Circuit Characteristics - Renesas H8/38024 Hardware Manual

Table 16. 31 Power Supply Voltage Detection Circuit Characteristics (5)
Using external reference voltage and detect voltage external input (VREFSEL = VINTDSEL =
VINTUSEL = 1)
Item
Comparator detection
accuracy
extD/extU pin input
voltage
Vref pin input voltage
Note: * The VextD voltage must always be greater than the VextU voltage.
16.8.8

Power-On Reset Circuit Characteristics

Table 16.32 Power-On Reset Circuit Characteristics
V = 2.7 V to 5.5 V, AV
CC
Item
RES pin pull-up
resistance
Power-on reset start
voltage
Note: Make sure to drop the power supply voltage, V
after the RES pin load had thoroughly dissipated. To drain the load of the RES pin,
attaching a diode to the V
work properly if the power supply voltage, V
Symbol Min Typ
Vcdl 0.1 —
VextD *
–0.3 —
VextU *
–0.3 —
Vref5 0.8 —
= 2.7 V to 5.5 V, V
CC
Rated Values
Symbol Min
R 65
RES
V —
por
side is recommended. The power-on reset function may not
CC
Rated Values
Max
—
V + 0.3 or
CC
AV + 0.3,
CC
whichever is
lower
3.6 or AV
CC
+ 0.3, whichever
is lower
2.8
= AV = 0.0 V, unless otherwise specified
SS SS
Typ Max
100 —
— 100
, to below Vpor = 100 mV and then raise it
CC
, is raised from a level exceeding 100 mV.
CC
Rev. 6.00, 08/04, page 509 of 628
Unit Test Condition
V | VextU – Vref |
| VextD – Vref |
V V = 2.7 to 3.3 V
CC
V V = 3.3 to 5.5 V
CC
V V = 2.7 to 5.5 V
CC
Unit Test Condition
kΩ
mV