ST72C254G2 datasheet(99/135 Pages) STMICROELECTRONICS

99 / 135 page

ST72104G, ST72215G, ST72216G, ST72254G

99/135

OPERATING CONDITIONS (Cont’d)

13.3.2 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

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.

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

VIT-

Reset generation threshold

(VDD fall)

High Threshold

Med. Threshold

Low Threshold

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

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

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

fOSC [MHz]

SUPPLY VOLTAGE [V]

2.5

VIT-≥3.5V

4.5

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

fOSC [MHz]

SUPPLY VOLTAGE [V]

2.5

VIT-≥3V

3.5

4.5

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

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