LTC1726E データシートの表示（PDF） - Linear Technology

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LTC1726E

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

Linear Technology 

LTC1726

Electrical Characteristics The l denotes the specifications which apply over the full operating

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

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX UNITS

VRT3

Reset Threshold VCC3

VCC3 Input Threshold

H-Grade

l 3.036

3.085

3.135

V

l 3.023

3.085

3.147

V

VRT5

Reset Threshold VCC5

VCC5 Input Threshold (5V Version)

H-Grade

l 4.600

4.675

4.750

V

l 4.582

4.675

4.769

V

VRT25

VRTA

Reset Threshold VCC25

Reset Threshold VCCA

VCC25 Input Threshold (2.5V Version),

VCCA Input Threshold

H-Grade

l 2.300

2.337

2.375

V

l 0.985

1.000

1.015

V

l 0.978

1.000

1.022

V

VCC

IVCC3

IVCC5

IVCC25

IVCCA

VCC3 or VCC5 Operating Voltage

VCC3 Supply Current

VCC5 Supply Current

VCC25 Supply Current

VCCA Input Current

RT Charge Current Out

RST in Correct Logic State

VCC5/VCC25 > VCC3

VCC5/VCC25 < VCC3, VCC3 = 3.3V

VCC5 = 5V

VCC25 < VCC3, VCC25 = 2.5V (Note 4)

VCCA = 1V

VRT = 0V

H-Grade

l

1

7

V

l

1

2

µA

l

16

30

µA

l

16

30

µA

l

1

2

µA

l –15

0

15

nA

l 1.4

2

2.6

µA

l 1.3

2

2.6

µA

WT Charge Current Out

VWT = 0V

H-Grade

l 1.4

2

2.6

µA

l 1.3

2

2.6

µA

RT Discharge Current Out

VRT = 1.3V

H-Grade

l 14

20

26

µA

l 13

20

28

µA

WT Discharge Current Out

VWT = 1.3V

H-Grade

l 14

20

26

µA

l 13

20

28

µA

∆tRT

Reset Time-Out Period Variation

CRT = 1500pF Deviation from tRT = 5ms (Note 5)

l –30

0

H-Grade

l –45

0

30

%

45

%

tUV

VCC Undervoltage Detect to RST

VCC25/VCC5, VCC3 or VCCA Less Than Reset

Threshold VRT by More Than 1%

130

µs

VOH

RST Output Voltage High (Note 6) ISOURCE = 1µA

l VCC3 – 1

V

VOL

RST Output Voltage Low

ISINK = 2.5mA, VCC5/VCC25 = 0V

l

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

l

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

l

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

l

0.15

0.4

V

0.05

0.3

V

0.05

0.3

V

0.05

0.3

V

VIH

WDI Input Threshold High

l

0.7 • VCC3

V

VIL

WDI Input Threshold Low

l 0.3 • VCC3

V

tWP

WDI Pulse Width

l 40

ns

∆tWT

Watchdog Time-Out Period Variation CWT = 1500pF Deviation from tWT = 33ms (Note 5)

l –30

0

H-Grade

l –45

0

30

%

45

%

WDI Leakage Current

l

±1

µA

LTC1726-5 Only

VOVR

VCC5 Reset Override Voltage (Note 7) Override VCC5 Ability to Assert RST

VCC3 ±0.025

V

For more information www.linear.com/LTC1726

1726fd

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