LTC1726 Datasheet | Linear Technology

LTC1726 Triple Supply Monitor and µP Supervisor with Adjustable Reset and Watchdog Timer Features n Monitors Three Inputs Simultaneously LTC1726-5: 5V, 3.3V and ADJ LTC1726-2.5: 2.5V, 3.3V and ADJ n±1.5% Threshold Accuracy Over Temperature n Low Supply Current: 16µA Typ n Adjustable Reset Timeout n Adjustable Watchdog Timeout n Active Low Open-Drain Reset Output n Power Supply Glitch Immunity n Guaranteed RESET for VCC3 ≥ 1V or VCC25/VCC5 ≥ 1V n MS8 and SO-8 Packages Applications n Desktop puters n Notebook puters n Intelligent Instruments n Portable Battery-Powered Equipment n Network Servers Description The LTC®1726 is a triple supply monitor and microprocessor supervisory circuit with adjustable reset and watchdog functions intended for systems with multiple supply voltages. The part has a mon open-drain reset output with an adjustable delay. The reset and watchdog time-out periods are both adjustable using external capacitors. Tight 1.5% accuracy specifications and glitch immunity ensure reliable reset operation without false triggering. The RST output is guaranteed to be in the correct state for VCC5/VCC25 or VCC3 down to 1V. The LTC1726 may also be configured to monitor any one or two VCC inputs instead of three, depending on system requirements. The low (16µA typical) supply current makes the LTC1726 ideal for power-conscious systems. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Thin SOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Application 3.3V 0.1µF 5V 0.1µF A 3.3V, 5V and 1.8V Monitor 1.8V (VTRIP = 1.665V) R1 66.5k 1% CRT 47n F CWT 47n F 213 VCC5 VCC3 VCCA RT RST LTC1726-5 WT WDI 6 5 R2 100k 1% RESET µP I/O t RT = 155ms t WT= 1s GND 4 1726 TA01 3.3V 0.1µF 2.5V 0.1µF A 3.3V, 2.5V and 1.8V Monitor 1.8V (VTRIP = 1.665V) R1 66.5k 1% CRT 47n F CWT 47n...