LTC1727I(Old_V) データシートの表示（PDF） - Linear Technology

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LTC1727I
(Rev.:Old_V)

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

Linear Technology 

LTC1727/LTC1728

PI FU CTIO S (LTC1727/LTC1728)

VCC3 (Pin 1/Pin 5): 3.3V Sense Input and Power

Supply Pin. (3V Sense Input and Power Supply Pin for

LTC1728-1.8.) This pin provides power to the part

when the voltage on VCC3 is greater than the voltage on

VCC5/VCC25/VCC18. Bypass to ground with a ≥ 0.1µF

ceramic capacitor.

VCC5 (Pin 2/Pin 4): 5V Sense Input and Power Supply

Pin. This pin is used on the LTC1727-5/LTC1728-5 to

provide power to the part when the voltage on VCC5 is

greater than the voltage on VCC3. Bypass to ground with

a ≥ 0.1µF ceramic capacitor.

VCC25 (Pin 2/Pin 4): 2.5V Sense Input and Power Supply

Pin. This pin is used on the LTC1727-2.5/LTC1728-2.5 to

provide power to the part when the voltage on VCC25 is

greater than the voltage on VCC3. Bypass to ground with

a ≥ 0.1µF ceramic capacitor.

VCC18 (Pin 2/Pin 4): 1.8V Sense Input and Power Supply

Pin. This pin is used on the LTC1728-1.8 to provide

power to the part when the voltage on VCC18 is greater

than the voltage on VCC3. Bypass to ground with a ≥ 0.1µF

ceramic capacitor.

VCCA (Pin 3/Pin 3): 1V Sense, High Impedance Input. If

unused, it can be tied to either VCC3 or VCC5/ VCC25/VCC18.

GND (Pin 4/Pin 2): Ground.

COMPA (Pin 5): VCCA Comparator Output for the LTC1727.

Active high, open-drain logic output with weak pull-up to

VCC3. Asserted when VCCA is above VRTA. Deasserted

when VCCA is below VRTA or if both the VCC3 and VCC5

supply pins are too low to power the internal bandgap

reference (typically < 2.0V). Can be pulled greater than

VCC3 using an external pull-up.

RST (Pin 6/Pin 1): Reset Logic Output. Active low, open-

drain logic output with weak pull-up to VCC3. Can be pulled

up greater than VCC3 when interfacing to 5V logic. As-

serted when one or all of the supplies are below trip thresh-

olds and held for 200ms after all supplies become valid.

COMP5 (Pin 7): VCC5 Comparator Output for the

LTC1727-5. Active high, open-drain logic output with

weak pull-up to VCC3. Asserted when VCC5 is above VRT5.

Can be pulled greater than VCC3 using an external pull-up.

COMP25 (Pin 7): VCC25 Comparator Output for the

LTC1727-2.5. Active high, open-drain logic output with

weak pull-up to VCC3. Asserted when VCC25 is above

VRT25. Can be pulled greater than VCC3 using an external

pull-up.

COMP3 (Pin 8): VCC3 Comparator Output for the LTC1727.

Active high, open-drain logic output with weak pull-up to

VCC3. Asserted when VCC3 is above VRT3. Can be pulled

greater than VCC3 using an external pull-up.

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