STM1404_08 datasheet(29/35 Pages) STMICROELECTRONICS

29 / 35 page

STM1404

DC and AC parameters

29/36

Figure 28.

Temperature hysteresis

Table 7.

Physical and environmental tamper detection levels

Sym

Parameter

Test

conditions(1)

Min

Typ

Max

Unit

VHV

Overvoltage trip level

4.0

4.2

4.4

VLV

Undervoltage trip level

1.9

2.0

2.1

SAL propagation delay time

(after over/under voltage detection)

VHV + 200 mV or

VLV – 200 mV

µs

VHTP

Trip point for NH physical tamper

input pins (TP1 or TP3)

VOUT - 1.3

(2)

VOUT - 0.3

(2)

VLTP

Trip point for NL physical tamper

input pins (TP2 or TP4)

0.3

1.0

SAL propagation delay time(3)

(after physical tamper pin

detection)

VHTP =

VOUT/VTPU;

VLTP = VSS

VDD = 3.6

µs

Physical tamper input (TPX) glitch

immunity

µs

Factory-programmed

IOUT = 0 mA

–5

80, 85, 95

°C

–5

–25, –35

°C

THYST

Temperature hysteresis

°C

Valid for ambient operating temperature: TA = –40 to 85°C; VCC = VLV to VHV (except where noted). All physical and

environmental tamper functions are operational across the full temperature alarm range for STM1404.

In the case of STM1404A, physical tamper input pins (TPX) are referenced to VOUT (pin 12). In the case of STM1404B or

C, TPX are referenced to VTPU pin (pin 9).

VCC = VRST (max) to 3.6 V

AI11147b

SAL

Temperature

THYST(High)

THYST(Low)

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