STWD100 datasheet(17/25 Pages) STMICROELECTRONICS

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STWD100

DC and AC parameters

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Table 4.

DC and AC characteristics

Sym

Description

Test condition(1)

Min

Typ

Max

Unit

VCC

Operating voltage

2.7

5.5

ICC

VCC supply current

µA

ILO

Open drain output leakage current

from output to the GND or VCC

–1

µA

Input leakage current (WDI)

–1

µA

VIH

Input high voltage (WDI, EN)0.7 VCC

VIL

Input low voltage (WDI, EN)0.3 VCC

VOL

Output low voltage (WDO)

VCC ≥ 2.7 V, ISINK = 1.2 mA

0.3

VCC ≥ 4.5 V, ISINK = 3.2 mA

0.4

VOH

Output high voltage (WDO) (push-pull

only)

VCC ≥ 2.7 V, ISOURCE = 500 µA

0.8 VCC

VCC ≥ 4.5 V, ISOURCE = 800 µA

0.8 VCC

Enable pin ( EN)

EN input pulse width

µs

EN glitch rejection

100

EN-to-WDO delay(2)

200

EN pull-down resistance

100

Watchdog Timer

VSTART Timer startup voltage

1.9

2.2

2.7

tWD

Watchdog timeout period

STWD100xP

2.3

3.4

4.6

STWD100xW

4.3

6.3

8.6

STWD100xX

102

142

STWD100xY

1.12

1.6

2.24

tPW

Watchdog active time

140

210

280

WDI-to-WDO delay(3)

150

WDI pulse width

µs

WDI glitch rejection

100

Valid for ambient operating temperature: TA = –40 to 125 °C; VCC = 2.7 V to 5.5 V except where noted.

WDO will assert for minimum of 10 µs even if EN transitions high.

WDO will assert for minimum of 10 µs regardless of transition on WDI (valid for STWD100xP only).

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