STR91XFA datasheet(50/78 Pages) STMICROELECTRONICS

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Electrical characteristics

STR91xFA

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6.3

LVD electrical characteristics

VDDQ = 2.7 - 3.6V, VDD = 1.65 - 2V, TA = -40 / 85 °C unless otherwise specified.

Table 9.

LVD Electrical Characteristics

6.3.1

LVD delay timing

Case 1: When VDDQ reaches the VDDQ_LVD+ threshold after the first ~10 ms delay (introduced

by the VDD rising edge), a new ~10 ms delay starts before the release of RESET_OUTn. See

Figure 10.

Figure 10. LVD reset delay case 1

Case 2: When VDDQ reaches the VDDQ_LVD+ threshold before the first ~10 ms delay

(introduced by the VDD rising edge), RESET_OUTn will be released immediately at the end of

the delay. No new delay is introduced in this case. See Figure 11.

Symbol

Parameter

Test

Conditions

Value

Unit

Min

Typ

Max

VDD_LVD+ (1.8V)

LVD threshold during VDD rise

1.43

1.50

1.58

VDD_LVD- (1.8V)

LVD threshold during VDD fall

1.33

1.40

1.47

VDD_BRN (1.8V)

VDD brown out warning threshold

1.65

VDDQ_LVD+ (3.0V) LVD threshold during VDDQ rise

(1)(2)

For VDDQ I/O voltage operating at 2.7 - 3.3V.

Selection of VDDQ operation range is made using configuration software from ST, or IDE from 3rd parties. The default

condition is VDDQ=2.7V - 3.3V.

2.32

2.45

2.57

VDDQ_LVD- (3.0V)

LVD threshold during VDDQ fall

(1)(2)

2.23

2.35

2.46

VDDQ_BRN (3.0V)

VDDQ brown out warning threshold

(1)(2)

2.65

VDDQ_LVD+ (3.3V) LVD threshold during VDDQ rise

(2)(3)

For VDDQ I/O voltage operating at 3.0 - 3.6V.

2.61

2.75

2.89

VDDQ_LVD- (3.3V)

LVD threshold during VDDQ fall

(2)(3)

2.52

2.65

2.78

VDDQ_BRN (3.3V)

VDDQ brown out warning threshold

(2)(3)

2.95

VDD_LVD+

VDDQ_LVD+

~10 ms delay

VDDQ (red)

RESET_OUTn (blue)

VDD (green)

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