LTC2921 datasheet(3/16 Pages) LINER

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LTC2903-1

29031f a

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IV1

V1 Input Current (Note 4)

V1 = 3.3V (LTC2903-A1, LTC2903-D1)

●

µA

V1 = 5V (LTC2903-B1, LTC2903-C1,

●

µA

LTC2903-E1)

IV2

V2 Input Current (Note 4)

V2 = 2.5V (LTC2903-A1)

●

830

µA

V2 = 3.3V (LTC2903-B1, LTC2903-C1)

●

µA

V2 = 0.55V (LTC2903-D1, LTC2903-E1)

●

±30

IV3

V3 Input Current

V3 = 1.8V (LTC2903-A1, LTC2903-C1)

●

830

µA

V3 = 2.5V (LTC2903-B1)

●

µA

V3 = 0.55V (LTC2903-D1, LTC2903-E1)

●

±30

IV4

V4 Input Current

V4 = 0.55V (LTC2903-A1)

●

±30

V4 = 1.8V (LTC2903-B1)

●

µA

V4 = –5.2V (LTC2903-C1)

●

–3

–6

µA

V4 = 0.55V (LTC2903-D1, LTC2903-E1)

●

±30

tRST

Reset Time-Out Period

●

140

200

260

tUV

VX Undervoltage Detect to RST

VX Less Than Threshold VRTX by

150

µs

More Than 1%

VOH

Output Voltage High RST (LTC2903-1) (Note 5)

IRST(DN) = –1µA (LTC2903-A1,

●

V2 – 1

LTC2903-B1, LTC2903-C1)

(LTC2903-D1, LTC2903-E1)

●

V1 – 1

VOL

Output Voltage Low RST (Note 6)

VCC = 0.2V, IRST = 0.1µA

●

560

VCC = 0.5V, IRST = 5µA

●

150

VCC = 1V, IRST = 200µA

●

300

VCC = 3V, IRST = 2500µA

●

100

300

The

● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

VCC = 3.3V unless otherwise noted.

Note 1: Absolute Maximum Ratings are those values beyond which the life

of the device may be impaired.

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

GND unless otherwise noted.

Note 3: The internal supply voltage (VCC) is generated from the greater

voltage on the V1 and V2 inputs. VCC = V1 for options D1 and E1.

Note 4: Under typical operating conditions, quiescent current is drawn

from the V1 input. When V2 exceeds V1, V2 supplies the quiescent

current. V1 only for options D1 and E1.

Note 5: The RST output pin on the LTC2903-1 has an internal pull-up to

V2 (for options A1, B1 and C1) of typically 10µA. However, for faster rise

times or for VOH voltages greater than V2, use an external pull-up resistor.

The internal pull-up is connected to V1 for options D1 and E1.

Note 6: For options A1, B1 and C1, the RST pulldown current is derived

from V1, V2 and V3. For options D1 and E1, pulldown strength is derived

from V1.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VRT33

3.3V, 5% Reset Threshold

V1 Input Threshold

●

3.036

3.086

3.135

VRTAV2

V2 Adjustable Threshold

V2 Input Threshold

●

0.492

0.500

0.508

VRTAV3

V3 Adjustable Threshold

V3 Input Threshold

●

0.492

0.500

0.508

VRTAV4

V4 Adjustable Threshold

V4 Input Threshold

●

0.492

0.500

0.508

(LTC2903-D1) The

● denotes the specifications which apply over the full

operating temperature range, otherwise specifications are at TA = 25°C. VCC = 3.3V unless otherwise noted.

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VRT50

5V, 5% Reset Threshold

V1 Input Threshold

●

4.600

4.675

4.750

VRTAV2

V2 Adjustable Threshold

V2 Input Threshold

●

0.492

0.500

0.508

VRTAV3

V3 Adjustable Threshold

V3 Input Threshold

●

0.492

0.500

0.508

VRTAV4

V4 Adjustable Threshold

V4 Input Threshold

●

0.492

0.500

0.508

(LTC2903-E1) The

● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at

TA = 25°C. VCC = 5V unless otherwise noted.

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