LTC1727/LTC1728

3

Rev. E

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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

Reset Threshold VCC3

VCC3 Input Threshold

l

3.036

3.086

3.135

V

VRT5

Reset Threshold VCC5

VCC5 Input Threshold (5V Version)

l

4.600

4.675

4.750

V

VRT25

Reset Threshold VCC25

VCC25 Input Threshold (2.5V Version)

l

2.300

2.338

2.375

V

VRTA

Reset Threshold VCCA

VCCA Input Threshold

l

0.985

1.000

1.015

V

VCCOP

VCC3, VCC5/VCC25 Operating Voltage

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

1

7

V

VCCOPA

VCC3, VCC5/VCC25 Operating Voltage

Minimum Supply Voltage to Guarantee COMPA

in Correct Logic State

l

2

2.3

V

IVCC3

VCC3 Supply Current

VCC5/VCC25 > VCC3

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

l

l

1

10

2

20

µA

µA

IVCC25

VCC25 Supply Current

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

l

1

2

µA

IVCC5

VCC5 Supply Current

VCC5 = 5V, VCC3 < VCC5

l

10

20

µA

IVCCA

VCCA Input Current

VCCA = 1V

–40°C < TA < 125°C

l

l

–15

–20

0

0

15

50

nA

nA

tRST

Reset Pulse Width

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

–40°C < TA < 125°C

l

l

140

140

200

280

350

ms

ms

tUV

VCC Undervoltage Detect to RST

or COMPX

VCC5, VCC25, VCC3 or VCCA Less Than Reset

Threshold VRT by More Than 1% (Note 5)

110

µs

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

l

l

l

l

0.15

0.05

0.05

0.05

0.4

0.3

0.3

0.3

V

V

V

V

VOH

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

l

VCC3 – 1

V

LTC1727-5/LTC1728-5 Only

VOVR

VCC5 Reset Override Voltage (Note 7)

Override VCC5 Ability to Assert RST

VCC3 ±0.025

V

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

Reset Threshold VCCA

VCCA Input Threshold

l

0.985

1.000

1.015

V

VCCOP

VCC3, VCC18 Operating Voltage

RST in Correct Logic State

l

1

7

V

IVCC3

VCC3 Supply Current

VCC18 > VCC3

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

l

l

1

10

2

20

µA

µA

IVCC18

VCC18 Supply Current

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

l

1

2

µA

IVCCA

VCCA Input Current

VCCA = 1V

l

–15

0

15

nA

tRST

Reset Pulse Width

RST Low (Note 5)

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

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

l

l

l

l

0.15

0.05

0.05

0.05

0.4

0.3

0.3

0.3

V

V

V

V

VOH

Output Voltage High, RST

ISOURCE = 1µA (Note 6)

l

VCC3 – 1

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.