LTC1726 Triple Supply Monitor and P Supervisor with Adjustable Reset and Watchdog Timer Fea T Descrip T n Monitors Three Inputs Simultaneously The LTC 1726 is a triple supply monitor and microproces- LTC1726-5: 5V, 3.3V and ADJ sor supervisory circuit with adjustable reset and watchdog LTC1726-2.5: 2.5V, 3.3V and ADJ functions intended for systems with multiple supply volt- n 1.5% Threshold Accuracy Over Temperature ages. The part has a common open-drain reset output n Low Supply Current: 16A Typ with an adjustable delay. The reset and watchdog time-out n Adjustable Reset Timeout periods are both adjustable using external capacitors. n Adjustable Watchdog Timeout Tight 1.5% accuracy specifications and glitch immunity n Active Low Open-Drain Reset Output ensure reliable reset operation without false triggering. n Power Supply Glitch Immunity n The RST output is guaranteed to be in the correct state for Guaranteed RESET for V 1V or V /V 1V CC3 CC25 CC5 n V /V or V down to 1V. The LTC1726 may also be MS8 and SO-8 Packages CC5 CC25 CC3 configured to monitor any one or two V inputs instead CC of three, depending on system requirements. a T The low (16A typical) supply current makes the LTC1726 n Desktop Computers ideal for power-conscious systems. n Notebook Computers L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property Intelligent Instruments of their respective owners. n Portable Battery-Powered Equipment n Network Servers Typical a T A 3.3V, 5V and 1.8V Monitor A 3.3V, 2.5V and 1.8V Monitor 1.8V 1.8V (V = 1.665V) (V = 1.665V) TRIP TRIP 3.3V R1 3.3V R1 66.5k 66.5k 0.1F 0.1F 1% 1% 2.5V 5V R2 R2 2 1 3 2 1 3 100k 0.1F C 100k 0.1F C RT RT V V V V V V 1% 47nF 1% 47nF CC5 CC3 CCA CC25 CC3 CCA 8 6 8 6 RT RST RESET RT RST RESET C C WT WT LTC1726-2.5 P LTC1726-5 P 47nF 47nF 5 5 7 7 WT WDI I/O WT WDI I/O GND GND 4 1726 TA01 4 1726 TA02 t = 155ms t = 155ms RT RT t = 1s t = 1s WT WT 1726fd 1 For more information www.linear.com/LTC1726 ion pplica ions pplica ion uresLTC1726 a T e Maxi Mu M r a T (Notes 1, 2) Terminal Voltage Operating Temperature Range (Note 3) V , V /V , V ........................... 0.3V to 7V LTC1726E, LTC1726I ............................40C to 85C CC3 CC5 CC25 CCA RST .......................................................... 0.3V to 7V LTC1726H .......................................... 40C to 125C WDI ......................................................... 0.3V to 7V Storage Temperature Range .................. 65C to 150C RT, WT ..................................................... 0.3V to 7V Lead Temperature (Soldering, 10 sec) ...................300C p c F T TOP VIEW TOP VIEW V 1 8 RT CC3 V 1 8 RT CC3 WT V /V 2 7 CC25 CC5 V /V 2 7 WT CC25 CC5 V 3 6 RST CCA V 3 6 RST CCA GND 4 5 WDI GND 4 5 WDI MS8 PACKAGE 8-LEAD PLASTIC MSOP S8 PACKAGE T = 125C, = 200C/W JMAX JA 8-LEAD PLASTIC SO T = 125C, = 150C/W JMAX JA o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC1726EMS8-2.5 PBF LTC1726EMS8-2.5 TRPBF LTKZ 8-Lead Plastic MSOP 40C to 85C LTC1726EMS8-5 PBF LTC1726EMS8-5 TRPBF LTLA 8-Lead Plastic MSOP 40C to 85C LTC1726HMS8-5 PBF LTC1726HMS8-5 TRPBF LTLA 8-Lead Plastic MSOP 40C to 125C LTC1726ES8-2.5 PBF LTC1726ES8-2.5 TRPBF 172625 8-Lead Plastic SO 40C to 85C LTC1726ES8-5 PBF LTC1726ES8-5 TRPBF 17265 8-Lead Plastic SO 40C to 85C LTC1726IS8-2.5 PBF LTC1726IS8-2.5 TRPBF 726I25 8-Lead Plastic SO 40C to 85C LTC1726IS8-5 PBF LTC1726IS8-5 TRPBF 1726I5 8-Lead Plastic SO 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: