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LTC1726IS8-5 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1726IS8-5 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LTC1726 1726fb TYPICAL APPLICATIONS FEATURES DESCRIPTIO Triple Supply Monitor and µP Supervisor with Adjustable Reset and Watchdog Timer ■ Monitors Three Inputs Simultaneously LTC1726-5: 5V, 3.3V and ADJ LTC1726-2.5: 2.5V, 3.3V and ADJ ■ ±1.5% Threshold Accuracy Over Temperature ■ Low Supply Current: 16 µA Typ ■ Adjustable Reset Timeout ■ Adjustable Watchdog Timeout ■ Active Low Open-Drain Reset Output ■ Power Supply Glitch Immunity ■ Guaranteed RESET for VCC3 ≥ 1V or VCC25/VCC5 ≥ 1V ■ MS8 and SO-8 Packages The LTC ®1726 is a triple supply monitor and microproces- sor supervisory circuit with adjustable reset and watchdog functions intended for systems with multiple supply volt- ages. The part has a common 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 (16 µA typical) supply current makes the LTC1726 ideal for power-conscious systems. ■ Desktop Computers ■ Notebook Computers ■ Intelligent Instruments ■ Portable Battery-Powered Equipment ■ Network Servers VCC5 RT CRT 47nF CWT 47nF 21 4 3 6 R1 66.5k 1% tRT = 155ms tWT= 1s R2 100k 1% 5 8 0.1 µF 7 1726 TA01 LTC1726-5 WT RST WDI VCC3 5V 3.3V 1.8V (VTRIP = 1.665V) GND VCCA µP RESET I/O 0.1 µF VCC25 RT CRT 47nF CWT 47nF 21 4 3 6 tRT = 155ms tWT= 1s R2 100k 1% 5 8 0.1 µF 7 1726 TA02 LTC1726-2.5 WT RST WDI VCC3 2.5V 3.3V 1.8V (VTRIP = 1.665V) GND VCCA µP RESET I/O 0.1 µF R1 66.5k 1% A 3.3V, 5V and 1.8V Monitor A 3.3V, 2.5V and 1.8V Monitor APPLICATIO S , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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