LTC1235CN Ver la hoja de datos (PDF) - Linear Technology

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Fabricante

LTC1235CN

Microprocessor Supervisory Circuit

Linear Technology 

LTC1235

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = Full Operating Range, VBATT = 2.8V, Backup = No Connection,

TA = 25°C, unless otherwise noted.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Battery Backup Switching

Operating Voltage Range

VCC

VBATT

VOUT Output Voltage

BACKUP Input Threshold

4.75

5.50

V

2.00

4.25

V

IOUT = 1mA

IOUT = 50mA

VCC – 0.05 VCC – 0.005

V

l VCC – 0.1 VCC – 0.005

V

VCC – 0.5 VCC – 0.25

V

VCC > Reset Voltage Threshold

Logic Low

Logic High

2.0

0.8

V

V

BACKUP Pullup Current (Note 4)

3

μA

VOUT in Battery Backup Mode (Note 5)

VOUT in Battery Saving Mode (Note 5)

VCC Supply Current (excluding IOUT)

IOUT = 250μA, VCC < VBATT

VCC < VBATT

1MΩ Pulldown on VOUT

IOUT ≤ 50mA

VBATT – 0.1 VBATT – 0.02

V

0

V

V

0.6

1.5

mA

l

0.6

2.5

mA

Battery Supply Current in Battery Backup Mode VCC = 0V, VBATT = 2.8V

0.04

1

μA

and Battery Saving Mode (Note 5)

l

0.04

5

μA

Battery Standby Current

(+ = Discharge, – = Charge)

5.5 > VCC > VBATT + 0.2V

–0.1

l

–1.0

+0.02

μA

+0.10

μA

Battery Switchover Threshold

VCC – VBATT

Battery Switchover Hysteresis

Power-Up

Power-Down

70

mV

50

mV

20

mV

BATT ON Output Voltage (Note 6)

BATT ON Output Short Circuit Current (Note 6)

ISINK = 3.2mA

BATT ON = VOUT Sink Current

BATT ON = 0V Source Current

0.4

V

35

mA

0.5

1

25

μA

Push-Button Reset

PB RST Input Threshold

Logic Low

Logic High

0.8

V

2.0

V

PB RST Input Low Time (Notes 4, 7)

l

40

ms

Reset and Watchdog Timer

Reset Voltage Threshold

l

4.5

4.65

4.75

V

Reset Threshold Hysteresis

40

mV

Reset Active Time

VCC = 5V

60

200

240

ms

l

140

200

280

ms

Watchdog Time-out Period

VCC = 5V

1.2

1.6

2.00

sec

l

1.0

1.6

2.25

sec

Reset Active Time PSRR

1

ms/V

Watchdog Time-out Period PSRR

8

ms/V

Minimum WDI Input Pulse Width

RESET Output Voltage At VCC = 1V

RESET and LOW LINE Output Voltage

(Note 6)

RESET and WDO Output Voltage

(Note 6)

VIL = 0.4V, VIH = 3.5V

ISINK = 10μA, VCC = 1V

ISINK = 1.6mA, VCC = 4.25V

ISOURCE = 1μA, VCC = 5V

ISINK = 1.6mA, VCC = 5V

ISOURCE = 1μA, VCC = 4.25V

l

200

ns

4

200

mV

0.4

V

3.5

V

0.4

V

3.5

V

1235fa

3

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