Specifications

ST72104Gx, ST72215Gx, ST72216Gx, ST72254Gx
100/141
OPERATING CONDITIONS (Cont’d)
13.3.2 Operating Conditions with Low Voltage Detector (LVD)
Subject to general operating conditions for V
DD
, f
OSC
, and T
A
.
Figure 53. High LVD Threshold Versus V
DD
and f
OSC
for FLASH devices
3)
Figure 54. Medium LVD Threshold Versus V
DD
and f
OSC
for FLASH devices
3)
Figure 55. Low LVD Threshold Versus V
DD
and f
OSC
for FLASH devices
2)4)
Notes:
1. LVD typical data are based on T
A
=25°C. They are given only as design guidelines and are not tested.
2. Data based on characterization results, not tested in production.
3. The V
DD
rise time rate condition is needed to insure a correct device power-on and LVD reset. Not tested in production.
4. If the low LVD threshold is selected, when V
DD
falls below 3.2V, (V
DD
minimum operating voltage), the device is guar-
anteed to continue functioning until it goes into reset state. The specified V
DD
min. value is necessary in the device power
on phase, but during a power down phase or voltage drop the device will function below this min. level.
Symbol Parameter Conditions Min Typ
1)
Max Unit
V
IT+
Reset release threshold
(V
DD
rise)
High Threshold
Med. Threshold
Low Threshold
4.10
2)
3.75
2)
3.25
2)
4.30
3.90
3.35
4.50
4.05
3.55
V
V
IT-
Reset generation threshold
(V
DD
fall)
High Threshold
Med. Threshold
Low Threshold
4)
3.85
2)
3.50
2)
3.00
4.05
3.65
3.10
4.30
3.95
3.35
V
hyst
LVD voltage threshold hysteresis V
IT+
-V
IT-
200 250 300 mV
Vt
POR
V
DD
rise time rate
3)
0.2 50 V/ms
t
g(VDD)
Filtered glitch delay on V
DD
2)
Not detected by the LVD 40 ns
f
OSC
[MHz]
SUPPLY VOLTAGE [V]
16
8
0
2.5 3 3.5 4 4.5 5 5.5
FUNCTIONAL AREA
DEVICE UNDER
FUNCTIONALITY AND RESET NOT GUARANTEED IN THIS AREA
FOR TEMPERATURES HIGHER THAN 85°C
RESET
IN THIS AREA
FUNCTIONALITY
NOT GUARANTEED
IN THIS AREA
V
IT-
≥3.85
12
f
OSC
[MHz]
SUPPLY VOLTAGE [V]
16
8
0
2.5 3 V
IT-
≥3.5V44.555.5
FUNCTIONAL AREA
DEVICE UNDER
FUNCTIONALITY AND RESET NOT GUARANTEED IN THIS AREA
FOR TEMPERATURES HIGHER THAN 85°C
RESET
IN THIS AREA
FUNCTIONALITY
NOT GUARANTEED
IN THIS AREA
12
f
OSC
[MHz]
SUPPLY VOLTAGE [V]
16
8
0
2.5 V
IT-
≥3V 3.5 4 4.5 5 5.5
FUNCTIONAL AREA
DEVICE UNDER
FUNCTIONALITY NOT GUARANTEED IN THIS AREA
FOR TEMPERATURES HIGHER THAN 85°C
RESET
IN THIS AREA
FUNCTIONALITY
NOT GUARANTEED
IN THIS AREA
12
3.2
SEE NOTE 4