LTC2938IDE datasheet(4/20 Pages) LINER

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LTC2938/LTC2939

293839ff

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IWDI

WDI Input Current

VWDI = GND

VWDI = 0.7V

VWDI = 1.1V

VWDI = 5V

–10

–30

μA

tWP

WDI Input Pulse Width

VCC = 3.3V or 5.5V

2μs

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

temperature range, otherwise speciﬁcations are at TA = 25°C, VCC = 5V unless otherwise speciﬁed. (Note 3)

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: All currents into pins are positive, all voltages are referenced to

GND unless otherwise noted.

Note 3: The greater of V1, V2 is the internal supply voltage (VCC).

Note 4: Under static no-fault conditions, V1 will necessarily supply

quiescent current. If at any time V2 is larger than V1, V2 must be capable

of supplying the quiescent current, programming (transient) current and

reference load current.

Note 5: The outputs RST and WDO have internal pull-ups to V2 of typically

6μA. However, external pull-up resistors may be used when faster rise

times are required or for VOH voltages greater than V2. For V2 conﬁgured

to monitor 1.2V, 1.5V, 1.8V and 2.5V supplies, external pull-up resistors

are required to ensure that the output voltage, high, is above the VIH input

threshold of the external circuit.

TYPICAL PERFORMANCE CHARACTERISTICS

Normalized Threshold Voltages

vs Temperature

–ADJ Threshold Voltage

vs Temperature

VREF vs Temperature

TEMPERATURE (°C)

–50

1.005

1.010

1.015

29389 G01

1.000

0.995

–25

100

125

0.990

0.985

TEMPERATURE (°C)

–50

29389 G02

–6

–25

100

125

–12

–18

TEMPERATURE (°C)

–50

1.216

1.222

1.228

29389 G03

1.210

1.204

–25

100

125

1.198

1.192

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