Data Sheet

21

Rev. 1.1, 2007-11-08

TLE7368

General Product Characteristics

Window Watchdog

4.4.122

H-input voltage

threshold

V

WDI, high

––

2.0

V

–

4.4.123

L-input voltage

threshold

V

WDI, low

0.8

–

–

V

–

4.4.124

WDI pull-up resistor

R

WDI

60

100

140

k

Ω

connected to Q_LDO2

4.4.125

Watchdog cycle time

T

WD

–2

–

4.4.126

Window duration (OW,

CW, FW)

t

WD, W

–

512

–

–

4.4.127

Window duration (IW)

t

WD, IW

–32

–

–

4.4.128

Window watchdog

initialization time

t

WD, start

–32

–

Watchdog will start/initialized if

WDI is kept low for this period

and RO_2 is released

4.4.129

Watchdog output low

voltage

V

WDO,low

––

0.4

V

I

4.4.130

Watchdog output

leakage current

I

WDO,leak

––

1

µA

WDO state = High

Thermal Shutdown

4.4.131

Overtemperature

shutdown

T

j, shtdwn

160

175

190

°C

1) 8)

4.4.132

Overtemperature

shutdown hysteresis

15

–

30

K

1)

1) Specified by design, not subject to production test.

2) Tested according to measurement circuit 1.

3)

V

4)

V

5) Minimum value given is needed for regulator stability; application might need higher capacitance than the minimum.

6) Measured when

V

7) External power transistor type: Fairchild KSH200.

8) Permanent operation of the device above 150

°C degrades lifetime; please refer to quality information.

Electrical Characteristics (cont’d)

V

V

Pos.

Parameter

Symbol

Limit Values

Unit

Conditions

Min.

Typ.

Max.