16

4964B–AUTO–07/07

ATA6842

16

Watchdog Oscillator RCOS

16.1 Oscillator frequency

ROS = 100 k

Ω ±1%,

COS = 1 nF ±5%

RCOS

f

OSC

910

11

kHz

A

16.2

Permissible

frequency range

No reset,

f – 1/(2

× ROS × COS)

RCOS

0.9

55

kHz

A

16.3 Permissible resistor

COS = 1 nF

RCOS

ROS

20

100

k

Ω

A

16.4 Permissible capacitor ROS = 100 k

Ω

RCOS

COS

1

10

nF

A

16.5

Short-circuit current

low

V(RCOS) = VI

RCOS

Isc()lo

1

4

mA

A

16.6 Leakage current

V(RCOS) = 0% to 63.2% VI

RCOS

Ilk()

–5

+5

µA

A

17

Main Oscillator

17.1

Main oscillator

frequency

RREF = 10 k

Ω ±2%

f

mosC

82.5

100

120

kHz

A

18

Comparator Cxl, x = 1, 2

18.1

Threshold voltage

detection

CxI

Vth(CxI)

1.1

1.23

1.4

V

A

18.2 Leakage current

V(CxI) = 0V to V5

CxI

Ilk(CxI)

–10

+10

µA

A

18.3 Propagation delay

dv/dt > 1V/µs

CxI

tpd(Cx)

20

µs

B

19

TCFET

19.1 Output voltage

Vo(TCFET) = V(TCFET) – V12,

V12 > 6.5V,

I(TCFET) = –20 µA to 0 µA

TCFET

Vo()

4.5

10

V

A

19.2

Short-circuit current

high

V(BSC) = 0V to V12 – 3V

BSC

Isc(BSC)hi

1

25

mA

A

19.3

Saturation voltage

high

Vd() = V(BSC) – V(TCFET),

TCFET = high,

I(TCFET) = –20 µA

BSC

Vs()hi

1.5

V

A

19.4

Saturation voltage

low

TCFET = low,

I(TCFET) = 50 µA

TCFET

Vs()lo

200

mV

A

19.5

Short-circuit current

high

V(TCFET) = 0V,

TCFET = high

TCFET

Isc()hi

–250

–50

–25

µA

A

19.6

Short-circuit current

low

V(TCFET) = 2V to V12,

TCFET = low

TCFET

Isc()lo

100

150

200

µA

A

19.7 Leakage current

V(BSC) = V12 to 36V,

TCFET = low

BSC

Ilk()

–10

+10

µA

A

5.

Electrical Characteristics (Continued)

Operating conditions: V12 = 6.5V to 26V, V5 = 5V ±3%, RREF = 10 k

Ω ±2%, T

No. Parameters

Test Conditions

Pin

Symbol

Min.

Typ.

Max.

Unit

Type*

*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter

Note:

1. Reduced operation mode means either

- R

- Voltage at pin TCFET could be beyond specified limits