LTC2909IDDB-3.3 datasheet(3/16 Pages) LINER

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LTC2909

2909fa

The ● denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C. VCC = 2.5V (LTC2909-2.5), VCC = 3.3V (LTC2909-3.3), VCC = 5V

(LTC2909-5), ADJ1 = ADJ2 = 0.55V, SEL = ﬂoating, unless otherwise noted. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VCC(MIN)

Operating Supply Voltage

⎯R⎯S⎯T in Correct State

●

0.5

VCC(SHUNT)

VCC Shunt Regulation Voltage

IVCC = 1mA, IVREF = 0

●

6.0

6.5

6.9

ICC

VCC Input Current

2.175 < VCC < 6V

●

150

µA

VRT

ADJ Input Threshold

●

0.492

0.500

0.508

ΔVRT

ADJ Hysteresis (Note 4)

TMR = VCC

1.5

3.5

10.0

IADJ

ADJ Input Current

VADJ = 0.55V

●

±15

VCC(UVLO)

VCC UVLO Threshold

LTC2909-2.5

LTC2909-3.3

LTC2909-5

●

2.175

2.871

4.350

2.213

2.921

4.425

2.250

2.970

4.500

ΔVCC(UVLO)

UVLO Hysteresis (Note 4)

TMR = VCC

0.3

0.7

2.0

VREF

Buffered Reference Voltage

VCC > 2.175V, IVREF = ±1mA

●

0.985

1.000

1.015

ITMR(UP)

TMR Pull-Up Current

VTMR = 1V

●

–1.5

–2.1

–2.7

µA

ITMR(DOWN)

TMR Pull-Down Current

VTMR = 1V

●

1.5

2.1

2.7

µA

t⎯R⎯S⎯T(EXT)

Reset Timeout Period, External

CTMR = 2.2nF

●

t⎯R⎯S⎯T(INT)

Reset Timeout Period, Internal

VTMR = 0V

●

150

200

260

VTMR(DIS)

Timer Disable Voltage

VTMR Rising

●

VCC

– 0.36

VCC

– 0.25

VCC

– 0.16

ΔVTMR(DIS)

Timer Disable Hysteresis

VTMR Falling

●

110

150

VTMR(INT)

Timer Internal Mode Voltage

VTMR Falling

●

0.14

0.21

0.27

ΔVTMR(INT)

Timer Internal Mode Hysteresis

VTMR Rising

●

110

tPROP

ADJx Comparator Propagation Delay

⎯R⎯S⎯T

ADJx Driven Beyond Reset Threshold

(VRTX) by 5mV

●

150

500

µs

tUV

VCC Undervoltage Detect to ⎯R⎯S⎯TVCC Less Than UVLO Threshold

(VCC(UVLO)) by 1%

●

150

500

µs

VOL(⎯R⎯S⎯T)

⎯R⎯S⎯T Output Voltage Low

VCC = 0.5V, I = 5µA

VCC = 1V, I = 100µA

VCC = 3V, I = 2500µA

●

0.01

0.10

0.15

0.30

IOH(⎯R⎯S⎯T)

⎯R⎯S⎯T Output Voltage High Leakage

⎯R⎯S⎯T = VCC

●

±1

µA

Three-State Input SEL

VIL

Low Level Input Voltage

●

0.4

VIH

High Level Input Voltage

●

1.4

Pin Voltage when Left in Open State

ISEL = 0µA

0.9

ISEL(Z)

Allowable Leakage in Open State

●

±5

±10

µA

ISEL

SEL Input Current

SEL = VCC or SEL = GND

●

±25

µA

ELECTRICAL CHARACTERISTICS

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: VCC maximum pin voltage is limited by input current. Since the

VCC pin has an internal 6.5V shunt regulator, a low impedance supply

which exceeds 6V may exceed the rated terminal current. Operation

from higher voltage supplies requires a series dropping resistor. See

Applications Information.

Note 4: Threshold voltages have no hysteresis unless the part is in

comparator mode. Hysteresis is one-sided, affecting only invalid-to-valid

transitions. See Applications Information.

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