LTC690 查看數據表（PDF） - Linear Technology

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LTC690

Microprocessor Supervisory Circuits

Linear Technology 

LTC690/LTC691

LTC694/LTC695

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

range, otherwise specifications are at TA = 25°C. VCC = full operating range, VBATT = 2.8V, unless otherwise noted.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Battery Back-Up Switching

Operating Voltage Range

VOUT Output Voltage

VOUT in Battery Back-Up Mode

Supply Current (Exclude IOUT)

VCC

VBATT

IOUT = 1mA

IOUT = 50mA

IOUT = 250μA, VCC < VBATT

IOUT = 50mA

4.75

5.50

V

2.00

4.25

V

VCC – 0.05 VCC – 0.005

V

l VCC – 0.10 VCC – 0.005

V

VCC – 0.50 VCC – 0.250

V

VBATT – 0.1 VBATT – 0.2

V

0.6

1.5

mA

l

0.6

2.5

mA

Supply Current in Battery Back-Up Mode

VCC = 0V, VBATT = 2.8V

0.04

1

μA

l

0.04

5

μA

Battery Standby Current (+ = Discharge, – = Charge) 5.5 > VCC > VBATT + 0.2V

–0.1

l –0.1

+0.02

μA

+0.10

μA

Battery Switchover Threshold, VCC – VBATT

Power Up

Power Down

70

mV

50

mV

Battery Switchover Hysteresis

20

mV

BATT ON Output Voltage (Note 4)

BATT ON Output Short-Circuit Current (Note 4)

ISINK = 3.2mA

BATT ON = VOUT Sink Current

0.4

V

35

m

BATT ON = 0V Source Current

0.5

1

25

μA

Reset and Watchdog Timer

Reset Voltage Threshold

l

4.5

4.65

4.75

V

Reset Threshold Hysteresis

40

mV

Reset Active Time (LTC690/91) (Note 5)

OSC SEL HIGH, VCC = 5V

40

50

60

ms

l

35

50

70

ms

Reset Active Time (LTC694/95) (Note 5)

OSC SEL HIGH, VCC = 5V

160

200

240

ms

l

140

200

280

ms

Watchdog Timeout Period, Internal Oscillator

Long Period, VCC = 5V

1.2

1.6

2.00

sec

l

1

1.6

2.25

sec

Short Period, VCC = 5V

80

100

120

ms

l

70

100

140

ms

Watchdog Timeout Period, External Clock (Note 6)

Long Period

Short Period

4032

4097

Clock

960

1025

Cycles

Reset Active Time PSRR

1

ms/V

Watchdog Timeout Period PSRR, Internal OSC

1

ms/V

Minimum WDI Input Pulse Width

RESET Output Voltage at VCC = 1V

RESET and LOW⎯LINE Output Voltage (Note 4)

RESET and WDO Output Voltage (Note 4)

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

690fe

4

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