ST72334J4TC View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
ST72334J4TC
STMicroelectronics
ST72334J4TC Datasheet PDF : 150 Pages
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ST72334xx-Auto, ST72314xx-Auto, ST72124Jx-Auto
OPERATING CONDITIONS (Cont’d)
15.3.2 Operating Conditions with Low Voltage Detector (LVD)
Subject to general operating conditions for VDD, fOSC, and TA.
Symbol
Parameter
Conditions
High Threshold
VIT+
Reset release threshold (VDD rise) Med. Threshold
Low Threshold
VIT-
Reset generation threshold (VDD
fall)
High Threshold
Med. Threshold
Low Threshold4)
Min
4.10 2)
3.75 2)
3.25 2)
3.852)
3.502)
3.00
Typ 1)
4.30
3.90
3.35
4.05
3.65
3.10
Max
4.50
4.05
3.55
4.30
3.95
3.35
Unit
V
Vhys
VtPOR
tg(VDD)
LVD voltage threshold hysteresis
VDD rise time rate 3)
Filtered glitch delay on VDD 2)
VIT+-VIT-
Not detected by the LVD
200 250 300 mV
0.2
50 V/ms
40
ns
Figure 56. High LVD Threshold Versus VDD and fOSC for Flash devices 3)
fOSC [MHz]
DEVICE UNDER 16
RESET 12
IN THIS AREA
8
FUNCTIONALITY AND RESET NOT GUARANTEED IN THIS AREA
FOR TEMPERATURES HIGHER THAN 85°C
FUNCTIONALITY
NOT GUARANTEED
IN THIS AREA
FUNCTIONAL AREA
0
2.5
3
3.5 VIT-≥3.85 4
4.5
5
SUPPLY VOLTAGE [V]
5.5
Figure 57. Medium LVD Threshold Versus VDD and fOSC for Flash devices 3)
fOSC [MHz]
DEVICE UNDER 16
RESET 12
IN THIS AREA
8
FUNCTIONALITY AND RESET NOT GUARANTEED IN THIS AREA
FOR TEMPERATURES HIGHER THAN 85°C
FUNCTIONALITY
NOT GUARANTEED
IN THIS AREA
FUNCTIONAL AREA
0
2.5
3
VIT-≥3.5V
4
4.5
5
SUPPLY VOLTAGE [V]
5.5
Figure 58. Low LVD Threshold Versus VDD and fOSC for Flash devices 2)4)
fOSC [MHz]
16
FUNCTIONALITY NOT GUARANTEED IN THIS AREA
FOR TEMPERATURES HIGHER THAN 85°C
FUNCTIONALITY
NOT GUARANTEED
IN THIS AREA
12
DEVICE UNDER
RESET
IN THIS AREA
8
0
2.5
SEE NOTE 4
VIT-≥3V 3.2 3.5
4
4.5
5
FUNCTIONAL AREA
SUPPLY VOLTAGE [V]
5.5
Notes:
1. LVD typical data is based on TA=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 VDD 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 VDD falls below 3.2V, (VDD minimum operating voltage), the device is guar-
anteed to continue functioning until it goes into reset state. The specified VDD 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.
112/150
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