ST72324BJ2 datasheet(140/188 Pages) STMICROELECTRONICS

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Electrical characteristics

ST72324B

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12.4

LVD/AVD characteristics

12.4.1

Operating conditions with LVD

Subject to general operating conditions for TA.

12.4.2

Auxiliary voltage detector (AVD) thresholds

Subject to general operating conditions for TA.

Table 86.

Operating conditions with LVD

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIT+(LVD) Reset release threshold (VDD rise)

VD level = high in option byte

4.0(1)

4.2

4.5

VD level = med. in option byte(2) 3.55(1)

3.75

4.0(1)

VD level = low in option byte(2)

2.95(1)

3.15

3.35(1)

VIT-(LVD) Reset generation threshold (VDD fall)

VD level = high in option byte

3.8

4.0

4.25(1)

VD level = med. in option byte(2) 3.35(1)

3.55

3.75(1)

VD level = low in option byte(2)

2.8(1)

3.0

3.15(1)

Vhys(LVD) LVD voltage threshold hysteresis

(1)

VIT+(LVD)-VIT-(LVD)

150

200

250

VtPOR

VDD rise time

(1)

Flash devices

6µs/V

100ms/V

8/16K ROM devices

20ms/V

32K ROM devices

∝ ms/V

tg(VDD)

Filtered glitch delay on VDD

(1)

Not detected by the LVD

Data based on characterization results, tested in production for ROM devices only.

If the medium or low thresholds are selected, the detection may occur outside the specified operating voltage range.

Table 87.

AVD thresholds

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIT+(AVD)

⇒ 0 AVDF flag toggle threshold

(VDD rise)

VD level = high in option byte

4.4(1)

4.6

4.9

VD level = med. in option byte

3.95(1) 4.15

4.4(1)

VD level = low in option byte

3.4(1)

3.6

3.8(1)

VIT-(AVD)

⇒ 1 AVDF flag toggle threshold

(VDD fall)

VD level = high in option byte

4.2

4.4

4.65(1)

VD level = med. in option byte

3.75(1)

4.0

4.2(1)

VD level = low in option byte

3.2(1)

3.4

3.6(1)

Vhys(AVD) AVD voltage threshold hysteresis

VIT+(AVD)-VIT-(AVD)

200

∆VIT-

Voltage drop between AVD flag set and

LVD reset activated

VIT-(AVD)-VIT-(LVD)

450

Data based on characterization results, tested in production for ROM devices only.

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