ST72F264G ST Microelectronics, ST72F264G Datasheet - Page 125

• Manufacturer Part Number: ST72F264G
• Description: (ST72F260G - ST72F264G) 8-BIT MCU
• Manufacturer: ST Microelectronics

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DataSheet
OPERATING CONDITIONS (Cont’d)
13.3.2 Low Voltage Detector (LVD) Thresholds
T
Notes:
1. Data based on characterization results, not tested in production.
2. When Vt
V
Figure 65. LVD Startup Behaviour
Note: When the LVD is enabled, the MCU reaches its authorized operating voltage from a reset state.
However, in some devices, the reset state is released when V
As a consequence, depending on the ramp-up speed, the I/Os may toggle when V
dow.
This may be an issue especially for applications where the MCU drives power components.
Because Flash write access is impossible within this window, the Flash memory contents will not be cor-
rupted.
V
V
V
Vt
t
IT+(LVD)
A
g(VDD)
Symbol
IT+(LVD)
IT-(LVD)
hys(LVD)
POR
= -40 to +85°C unless otherwise specified
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threshold.
POR
Reset release threshold
(V
Reset generation threshold
(V
LVD voltage threshold hysteresis
V
Filtered glitch delay on V
DD
DD
DD
is faster than 100 s/V, the Reset signal is released after a delay of max. 42µs after V
1.5V
0.8V
rise time rate
V
5V
rise)
fall)
IT+
Parameter
1)2)
DD
1)
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High Threshold
Med. Threshold
Low Threshold
High Threshold
Med. Threshold
Low Threshold
V
Not detected by the LVD
IT+(LVD)
-V
Conditions
Window
IT-(LVD)
DD
is approximately between 0.8V and 1.5V.
ST72260G, ST72262G, ST72264G
3.55
2.95
4.0
3.75
2.75
t
Min
150
3.3
20
1)
1)
1)
LVD RESET
Typ
3.75
3.15
3.55
200
4.2
4.0
3.0
DD
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is within this win-
4.25
3.75
3.15
Max
3.35
250
100
4.5
4.0
40
DD
1)
1)
1)
crosses the
125/171
ms/V
Unit
mV
ns
s/V
V
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