LTC1726IS8-2.5(RevB) 查看數據表（PDF） - Linear Technology

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LTC1726IS8-2.5
(Rev.:RevB)

Triple Supply Monitor and µP Supervisor with Adjustable Reset and Watchdog Timer

Linear Technology 

LTC1726

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

temperature range, otherwise specificaitons are at TA = 25°C. VCC3 = 3.3V, VCC5 = 5V, VCC25 = 2.5V, VCCA = VCC3 unless

otherwise noted.

SYMBOL

VOH

VOL

PARAMETER

RST Output Voltage High (Note 6)

RST Output Voltage Low

VIH

WDI Input Threshold High

VIL

WDI Input Threshold Low

tWP

WDI Pulse Width

∆tWT

Watchdog Time-Out Period Variation

WDI Leakage Current

LTC1726-5 Only

VOVR

VCC5 Reset Override Voltage (Note 7)

CONDITIONS

MIN TYP MAX UNITS

ISOURCE = 1µA

ISINK = 2.5mA, VCC5/VCC25 = 0V

ISINK = 100µA, VCC3 = 1V, VCC5/VCC25 = 0V

ISINK = 100µA, VCC3 = 0V, VCC5/VCC25 = 1V

ISINK = 100µA, VCC3 = 1V, VCC5/VCC25 = 1V

● VCC3 – 1

V

●

0.15

0.4

V

●

0.05

0.3

V

●

0.05

0.3

V

●

0.05

0.3

V

●

● 0.3 • VCC3

0.7 • VCC3

V

V

●

40

ns

CWT = 1500pF Deviation from tWT = 33ms (Note 5) ● –30

0

30

%

●

±1

µA

Override VCC5 Ability to Assert RST

VCC3 ±0.025

V

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 voltage values are with respect to GND.

Note 3: The LTC1726E is guaranteed to meet performance specifications

from 0°C to 70°C. Specifications over the –40°C to 85°C operating

temperature range are assured by design, characterization and correlation

with statistical process controls.

Note 4: Both VCC3 and VCC25/VCC5 can act as the supply depending on

which pin has the greatest potential.

Note 5: Timing measured with respect to RST passing through 1.5V.

Note 6: The output pin RST has a weak internal pull-up to VCC3 of typically

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

times are required or for VOH voltages greater than VCC3.

Note 7: The VCC5 reset override voltage is valid for an operating range less

than approximately 4.15V. Above this point the override is turned off and

the VCC5 pin functions normally.

TYPICAL PERFOR A CE CHARACTERISTICS

VCC5 Threshold Voltage

vs Temperature (LTC1726-5)

4.750

4.725

4.700

4.675

4.650

4.625

4.600

–60 –40 –20 0 20 40 60

TEMPERATURE (°C)

80 100

1726 G01

VCC3 Threshold Voltage

vs Temperature

3.135

3.125

3.115

3.105

3.095

3.085

3.075

3.065

3.055

3.045

3.035

– 60 –40 – 20 0 20 40 60 80 100

TEMPERATURE (°C)

1726 G02

VCCA Threshold Voltage

vs Temperature

1.015

1.010

1.005

1.000

0.995

0.990

0.985

–60 –40 –20 0 20 40 60

TEMPERATURE (°C)

80 100

1726 G03

1726fb

3

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