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参数资料
型号： ST72C254G1M6
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO28
封装： 0.300 INCH, PLASTIC, SOIC-28
文件页数： 134/136页
文件大小： 929K
代理商： ST72C254G1M6
ST72104G, ST72215G, ST72216G, ST72254G
97/136
OPERATING CONDITIONS (Cont’d)
14.3.2 Operating Conditions with Low Voltage Detector (LVD)
Subject to general operating conditions for VDD,fOSC, and TA.
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 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.
Symbol
Parameter
Condition s
Min
Typ 1)
Max
Unit
VIT+
Reset release threshold
(VDD 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
3.45
V
VIT-
Reset generation threshold
(VDD fall)
High Threshold
Med. Threshold
Low Threshold4)
3.85
3.50
3.00
4.05
3.65
3.10
4.25
3.80
3.20
Vhyst
LVD voltage threshold hysteresis
VIT+-VIT-
200
250
300
mV
VtPOR
VDD rise time rate
3)
0.2
50
V/ms
tg(VDD)
Filtered glitch delay on VDD
2)
Not detected by the LVD
40
ns
fOSC [MHz]
SUPPLY VOLTAGE [V]
16
8
0
2.5
3
3.5
4
4.5
5
5.5
FUNCTI ONAL AREA
DEVICE UNDER
FUNCT IONALITY AND RESE T NOT GUARANTEED IN THIS AREA
FOR TEMPERATURES HIGHER THAN 85
°C
RESET
IN THIS AREA
FUNCTI ONALITY
NOT GUARAN TEED
IN THIS AREA
VIT-≥3.85
12
fOSC [MHz]
SUPPLY VOLTAGE [V]
16
8
0
2.5
3
VIT-≥3.5V
4
4.5
5
5.5
FUNCTI ONAL AREA
DEVICE UNDER
FUNCTIONALI TY AND RESET NOT GUARANTEE D IN THIS AREA
FOR TEMPERATURES HIGHER THAN 85
°C
RESET
IN THIS AREA
FUNCTI ONALITY
NOT GUARAN TEED
IN THIS AREA
12
fOSC [MHz]
SUPPLY VOLTAGE [V]
16
8
0
2.5
VIT-≥3V
3.5
4
4.5
5
5.5
FUNCTI ONAL AREA
DEVICE UNDER
FUNCTIONA LITY NOT GUARAN TEED IN THIS AREA
FOR TEMPERATURES HIGHER THAN 85
°C
RESET
IN THIS AREA
FUNCTI ONALITY
NOT GUARAN TEED
IN THIS AREA
12
3.2
SEE NOTE 4
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