TD340

5/21

ELECTRICAL CHARACTERISTICS (continued)

Vbatt= 12V, Tamb=-40

°C to 125°C (unless otherwise specified)

Symbol

Parameter

Test Conditio n

Min.

Typ.

Max.

Unit

VOLTAGE REGULATOR - Co=220nF - note 2

Output Voltage

Io=20mA

T=25

°C

40

°C < T < 125°C

4.6

4.5

5

5

5.4

5.5

V

V

Line

Reg

Line Regulation

6V < Vbatt < 16V, Io=20mA

T=25

°C

40

°C < T < 125°C

100

150

mV

mV

Load

Reg

Load Regulation

0

≤ Io ≤ 40mA

T=25

°C

40

°C < T < 125°C

20

40

mV

mV

Maximum Output Current

Vbatt = 12V

6V < Vbatt < 16V

40

20

mA

mA

Output Current Short Circuit

Vout=0

100

200

mA

RESET SUPERVISORY CIRCUIT - note 3

Threshold Voltage Vout Increasing

T=25

°C

40

°C < T < 125°C

4.0

3.9

4.3

4.5

4.6

V

V

Threshold Voltage Vout Decreasing

T=25

°C

40

°C < T < 125°C

3.9

3.8

4.2

4.4

4.5

V

V

Linearity coefficient (Vthi = ki Vout)

0.86

Linearity coefficient (Vthd = kd Vout)

0.84

Hysteresis Threshold Voltage

50

100

200

mV

Response Time High to Low

5

µs

WATCHDOG CIRCUIT

Watchdog Time Out Period

No ext. capacitor

Cwd = 47nF - note 4

0.5

0.7

1

1

2

1.5

ms

s

Watchdog Input Pulse Width for Proper

Retrigger

0.1

µs

Watchdog Input Rise Time for Proper

Retrigger

0.1

µs

Reset Pulse Width

10

20

40

µs

TEMPERATURE OUTPUT

Output Voltage

2.58

2.68

2.78

V

∆V

T

Output Temperature Drift

-7

-7.5

-7.8

mV/

Notes :

1. For proper operation, a 5.6k resistor needs to be connected between OSC and GND.

2. 220nF is the optimized value for the voltage regulator

3. The reset thresholds (Vout increasing and decreasing) are proportional to Vout, (coefficients ki and kd). ki and kd vary in the same direc-

tion with temperature.

4. Watchdog capacitor Cwd should be placed as close as possible to CWD pin.