ST72C254G2 datasheet(100/140 Pages) STMICROELECTRONICS

100 / 140 page

ST72104G, ST72215G, ST72216G, ST72254G

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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

Figure 54. Medium LVD Threshold Versus V

DD and f

OSC for FLASH devices

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

Conditions

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

3.55

VIT-

Reset generation threshold

(VDD fall)

High Threshold

Med. Threshold

Low Threshold4)

3.85 2)

3.50 2)

3.00

4.05

3.65

3.10

4.30

3.95

3.35

Vhyst

LVD voltage threshold hysteresis

VIT+-VIT-

200

250

300

VtPOR

VDD rise time rate

0.2

V/ms

tg(VDD)

Filtered glitch delay on VDD

Not detected by the LVD

fOSC [MHz]

SUPPLY VOLTAGE [V]

2.5

3.5

4.5

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

VIT-≥3.85

fOSC [MHz]

SUPPLY VOLTAGE [V]

2.5

VIT-≥3.5V

4.5

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

fOSC [MHz]

SUPPLY VOLTAGE [V]

2.5

VIT-≥3V

3.5

4.5

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

3.2

SEE NOTE 4

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