LTC1727 データシートの表示（PDF） - Linear Technology

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LTC1727

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

Linear Technology 

LTC1727/LTC1728

PIN FUNCTIONS (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/LTC1728‑3.3 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 un-

used, 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. Asserted

when one or all of the supplies are below trip thresholds

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.

For more information www.linear.com/LTC1727

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