LTC1728

` Monitors Three Inputs Simultaneously
    LTC1727-5: 5V, 3.3V and ADJ
    LTC1727-2.5: 2.5V, 3.3V and ADJ
    LTC1728-5: 5V, 3.3V and ADJ
    LTC1728-2.5: 2.5V, 3.3V and ADJ
    LTC1728-1.8: 3V, 1.8V and ADJ
    LTC1728-3.3: 3.3V, 1.8V and ADJ
` ±1.5% Threshold Accuracy Over Temperature
` Very Low Supply Current: 10A Typ
` 200ms Reset Time Delay
` Active Low RESET Output
` Power Supply Glitch Immunity
` Guaranteed RESET for V<sub>CC3</sub> 1V or V<sub>CC5</sub>/VC<sub>C25</sub>/V<sub>CC18</sub> 1V
` LTC1727 Includes Monitor Output for Each Supply
` LTC1727: 8-Lead MSOP and SO Packages
` LTC1728: 5-Lead SOT-23 Package

· Desktop Computers
· Notebook Computers
· Intelligent Instruments
· Portable Battery-Powered Equipment
· Network Servers

V_CC3, V_CC5/V_CC25/V_CC18, V_CCA ............. 0.3V to 7V
RST ....................................................... 0.3V to 7V
COMPA, COMP3, COMP25/COMP5
(MS8 and SO-8 Only) ............................ 0.3V to 7V
Operating Temperature Range
(Note 3) ........................................ 40°C to 85°C
Storage Temperature Range ....... 65°C to 150°C
Lead Temperature (Soldering, 10 sec)........... 300°C

The LTC^®1727 is a triple supply monitor intended for systems with multiple supply voltages. Each supply monitor has its own open-drain output for individual supply monitoring. A common open-drain reset output remains low until all three supplies have been in compliance for 200ms. Tight 1.5% accuracy specifications and glitch immunity ensure reliable reset operation without false triggering.

The LTC1728 is functionally identical to the LTC1727 without the individual monitor outputs.

The RST output is guaranteed to be in the correct state for V_CC5/V_CC25/V_CC18 or V_CC3 down to 1V. The LTC1727/ LTC1728 may also be configured to monitor any one or two V_CC inputs instead of three, depending on system requirements.

Very low (10mA typical) supply current makes the LTC1727/ LTC1728 ideal for power conscious systems.

The LTC1727 is available in an 8-lead MSOP or SO package and the LTC1728 is available in a 5-lead SOT-23 package.