LTC2908 datasheet(4/18 Pages) LINER

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LTC2908

2908fd

TYPICAL PERFORMANCE CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

tRST

Reset Time-Out Period

160

200

260

tUV

VX Undervoltage Detect to RST

VX Less Than Reset Threshold VRTX by

More Than 1%

250

μs

VOH

Output Voltage High RST (Note 5)

IRST = –1μA, VCC = 5V (LTC2908-A1)

IRST = –1μA, VCC = 3.3V (LTC2908-B1)

IRST = –1μA, VCC = 2.5V (LTC2908-C1)

VCC – 1.5

VCC – 1.0

VOL

Output Voltage Low RST

VCC = 0.5V, IRST = 5μA

VCC = 1.0V, IRST = 100μA

VCC = 3.0V, IRST = 2500μA

0.01

0.10

0.15

0.30

ELECTRICAL CHARACTERISTICS

The

l denotes speciﬁcations which apply over the full operating temperature range, otherwise speciﬁcations are TA = 25°C. VCC = 5V

for the LT2908-A1, VCC = 3.3V for the LTC2908-B1 or VCC = 2.5V for the LTC2908-C1, unless otherwise noted. (Notes 2, 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

reliabilty and lifetime.

Note 2: The greater of V1, V2 is the internal supply voltage (VCC) for the

LTC2908-A1 and the LTC2908-B1. V1 is the internal supply voltage (VCC)

for the LTC2908-C1.

Note 3: All currents into pins are positive; all voltages are referenced to

GND unless otherwise noted.

Note 4: Under typical operating conditions, most of the quiescent cur-

rent is drawn from the V1 input. When V2 exceeds V1, V2 supplies most

of the quiescent current.

Note 5: The output pin RST has an internal pull-up to VCC of typically

6μA. However, an external pull-up resistor may be used when a faster

rise time is required or for VOH voltages greater than VCC.

TEMPERATURE (°C)

–50

4.750

4.725

4.700

4.675

4.650

4.625

4.600

2908 G01

–25

100

TEMPERATURE (°C)

–50

3.135

3.115

3.095

3.075

3.055

3.035

2908 G02

–25

100

TEMPERATURE (°C)

–50

2.375

2.360

2.345

2.330

2.315

2.300

2908 G03

–25

100

Speciﬁcations are at TA = 25°C unless otherwise noted.

5V Threshold Voltage

vs Temperature

3.3V Threshold Voltage

vs Temperature

2.5V Threshold Voltage

vs Temperature

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