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LTC1235CSW

Microprocessor Supervisory Circuit

Linear Technology 

TYPICAL PERFORMANCE CHARACTERISTICS

LTC1235

VOUT vs IOUT

5.00

4.95

4.90

SLOPE = 5Ω

4.85

VCC = 5V

VBATT = 2.8V

TA = 25°C

4.80

4.75

0

10

20

30

40

50

LOAD CURRENT (mA)

1235 G01

RESET Output Voltage vs

SupplyVoltage

5

TA = 25°C

EXTERNAL PULLUP = 10μA

4 VBATT = 0V

3

2

1

VOUT vs IOUT

2.80

2.78

SLOPE = 125Ω

2.76

VCC = 0V

VBATT = 2.8V

TA = 25°C

BACKUP MODE

SELECTED

2.74

2.72

0

100 200 300 400 500

LOAD CURRENT (μA)

1235 G02

Reset Active Time vs

Temperature

232

VCC = 5V

224

216

208

200

192

Power Failure Input Threshold

vs Temperature

1.308

1.306

VCC = 5V

1.304

1.302

1.300

1.298

1.296

1.294

–50 –25

0 25 50 75

TEMPERATURE (˚C)

100 125

1235 G03

Reset Voltage Threshold vs

Temperature

4.66

4.65

4.64

4.63

4.62

4.61

0

0

1

2

3

4

5

SUPPLY VOLTAGE (V)

1235 G04

184

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1235 G05

4.60

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1235 G06

Power Fail Comparator

Response Time

6

5

VCC = 5V

TA = 25°C

4

3

VPFI +

PFO

2

1.3V –

30pF

1

0

Power Fail Comparator

Response Time

6

5

VCC = 5V

TA = 25°C

4

3

2

VPFI +

PFO

1

1.3V –

30pF

0

Power Fail Comparator Response

Time with Pullup Resistor

6

5

VCC = 5V

TA = 25°C

4

3

2

1

+5V

VPFI +

10k

0

PFO

1.3V –

30pF

1.305V

1.285V

VPFI = 20mV STEP

01 2 34 567 8

TIME (μs)

1235 G07

1.315V

1.295V

VPFI = 20mV STEP

0 20 40 60 80 100 120 140 160 180

TIME (μs)

1235 G08

1.315V

1.295V

VPFI = 20mV STEP

0 2 4 6 8 10 12 14 16 18

TIME (μs)

1235 G09

1235fa

5

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