LTC1728 データシートの表示（PDF） - Linear Technology

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LTC1728

Micropower Precision Triple Supply Monitors in 8-Lead MSOP and 5-Lead SOT-23 Packages

Linear Technology 

LTC1727/LTC1728

ELECTRICAL CHARACTERISTICS All except LTC1728-1.8/LTC1728-3.3. The l denotes 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

VRT5

VRT25

VRTA

VCCOP

VCCOPA

Reset Threshold VCC3

Reset Threshold VCC5

Reset Threshold VCC25

Reset Threshold VCCA

VCC3, VCC5/VCC25 Operating Voltage

VCC3, VCC5/VCC25 Operating Voltage

VCC3 Input Threshold

l 3.036 3.086 3.135 V

VCC5 Input Threshold (5V Version)

l 4.600 4.675 4.750 V

VCC25 Input Threshold (2.5V Version)

l 2.300 2.338 2.375 V

VCCA Input Threshold

l 0.985 1.000 1.015 V

RST, COMP3, COMP5, COMP25 in Correct Logic State l 1

7

V

Minimum Supply Voltage to Guarantee COMPA

l

in Correct Logic State

2

2.3

V

IVCC3 VCC3 Supply Current

VCC5/VCC25 > VCC3

VCC5/VCC25 < VCC3, VCC3 = 3.3V (Note 4)

IVCC25 VCC25 Supply Current

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

IVCC5 VCC5 Supply Current

VCC5 = 5V, VCC3 < VCC5

IVCCA VCCA Input Current

VCCA = 1V

–40°C < TA < 125°C

tRST

Reset Pulse Width

RST Low with 10k Pull-Up to VCC3 (Note 5)

–40°C < TA < 125°C

tUV

VCC Undervoltage Detect to RST

or COMPX

VCC5, VCC25, VCC3 or VCCA Less Than Reset

Threshold VRT by More Than 1% (Note 5)

VOL

Output Voltage Low, RST, COMPX

ISINK = 2.5mA, VCC3 = 3V, VCC5/VCC25 = 0V

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

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

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

VOH

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

LTC1727-5/LTC1728-5 Only

l

l

l

l

l –15

l –20

l 140

l 140

1

2

µA

10

20

µA

1

2

µA

10

20

µA

0

15

nA

0

50

nA

200 280 ms

350 ms

110

µs

l

0.15 0.4

V

l

0.05 0.3

V

l

0.05 0.3

V

l

0.05 0.3

V

l VCC3 – 1

V

VOVR VCC5 Reset Override Voltage (Note 7)

Override VCC5 Ability to Assert RST

VCC3 ±0.025

V

LTC1728-1.8 The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at

TA = 25°C. VCC3 = 3V, VCC18 = 1.8V, VCCA = VCC3 unless otherwise noted.

SYMBOL PARAMETER

CONDITIONS

MIN TYP MAX UNITS

VRT3

Reset Threshold VCC3

VCC3 Input Threshold

l 2.760 2.805 2.850

V

VRT18

Reset Threshold VCC18

VCC18 Input Threshold

l 1.656 1.683 1.710

V

VRTA

VCCOP

IVCC3

IVCC18

IVCCA

tRST

Reset Threshold VCCA

VCC3, VCC18 Operating Voltage

VCC3 Supply Current

VCC18 Supply Current

VCCA Input Current

Reset Pulse Width

VCCA Input Threshold

RST in Correct Logic State

VCC18 > VCC3

VCC18 < VCC3, VCC3 = 3V (Note 4)

VCC18 < VCC3, VCC18 = 1.8V (Note 4)

VCCA = 1V

RST Low (Note 5)

l 0.985 1.000 1.015

V

l

1

7

V

l

1

2

µA

l

10

20

µA

l

1

2

µA

l –15

0

15

nA

l 140

200

280

ms

tUV

VCC Undervoltage Detect to RST

VCC18, VCC3 or VCCA Less Than Reset (Note 5)

Threshold VRT by More Than 1%

110

µs

VOL

Output Voltage Low, RST

VOH

Output Voltage High, RST

ISINK = 2.5mA, VCC3 = 3V, VCC18 = 0V

ISINK = 100µA, VCC3 = 1V, VCC18 = 0V

ISINK = 100µA, VCC3 = 0V, VCC18 = 1V

ISINK = 100µA, VCC3 = 1V, VCC18 = 1V

ISOURCE = 1µA (Note 6)

l

0.15

0.4

V

l

0.05

0.3

V

l

0.05

0.3

V

l

0.05

0.3

V

l VCC3 – 1

V

For more information www.linear.com/LTC1727

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