LTC2935 Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds FEATURES DESCRIPTION n 500nA Quiescent Current The LTC 2935 ultra-low power voltage monitor provides n 1.5% (Max) Accuracy over Temperature system initialization, power-fail warning and reset gen- n Integrated Precision Attenuators eration functions. Low quiescent current (500nA typical) n Eight Pin-Selectable Reset Thresholds makes the LTC2935 an ideal choice for battery-operated n Eight Pin-Selectable Power-Fail Thresholds applications. n Early Warning Power-Fail Output Three binary threshold-select inputs con gure one of n 200ms Reset Timeout eight integrated reset thresholds, ranging from 1.6V to n Manual Reset Input 3.45V in pre-determined increments. Early warning of an n Compact 8-Lead, 2mm 2mm DFN and impending low voltage condition is provided at the power- TSOT-23 (ThinSOT) Packages fail output (PFO), whose threshold is above the con gured reset threshold. Supervisory circuits monitor V and CC pull RST low when V drops below the con gured reset APPLICATIONS CC threshold. When V is rising from an under-threshold CC n Portable Equipment condition, an internal reset timer is started after exceeding n Battery-Powered Equipment the reset threshold by 5%. A 200ms reset timeout delays n Security Systems the return of the RST output to a high state. A pushbut- n Point-of-Sale Devices ton switch connected to the MR input is typically used to n Wireless Systems force a manual reset. Outputs RST and PFO are available L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear with open-drain (LTC2935-1/LTC2935-3) or active pull-up Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. (LTC2935-2/LTC2935-4) circuits. Operating temperature range is from 40C to 85C. TYPICAL APPLICATION Falling Threshold Selection Table Con gurable Low Power Voltage Monitor LTC2935-1/LTC2935-2 LTC2935-3/LTC2935-4 V IN RESET POWER-FAIL RESET POWER-FAIL THRESHOLD THRESHOLD THRESHOLD THRESHOLD V CC (V) (V) (V) (V) S2S1S0 S2 PFO 0.1F 3.30 3.45 2.44 2.56 Low Low Low BATTERY S1 LTC2935-2 POWERED 3.15 3.30 2.32 2.44 Low Low High S0 SYSTEM LOGIC 3.00 3.15 2.20 2.32 Low High High MR RST 2.85 3.00 2.08 2.20 Low High Low GND 2.70 2.85 1.96 2.08 High High Low 2935 TA01a 2.55 2.70 1.84 1.96 High Low Low 2.40 2.55 1.72 1.84 High Low High 2.25 2.40 1.60 1.72 High High High 2935fa 1LTC2935 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Operating Ambient Temperature Range Input Voltages V ........................................................... 0.3V to 6V LTC2935C ................................................ 0C to 70C CC LTC2935I.............................................. 40C to 85C S2, S1, S0, MR .........................0.3V to (V + 0.3V) CC Output Voltages (PFO, RST) Storage Temperature Range ................... 65C to 150C Lead Temperature (Soldering, 10 sec) LTC2935-1/LTC2935-3 ............................. 0.3V to 6V LTC2935-2/LTC2935-4 ..............0.3V to (V + 0.3V) TSOT-23 Package ..............................................300C CC RMS Currents PFO, RST ..........................................................5mA PIN CONFIGURATION TOP VIEW TOP VIEW V 1 8 S2 CC S2 1 8 V CC MR 2 7 S1 9 S1 2 7MR RST 3 6 S0 S0 3 6RST PFO 4 5 GND GND 4 5PFO TS8 PACKAGE DC PACKAGE 8-LEAD PLASTIC TSOT-23 8-LEAD (2mm s 2mm) PLASTIC DFN T = 125C, = 195C/W JMAX JA T = 125C, = 102C/W JMAX JA EXPOSED PAD (PIN 9), PCB GND CONNECTION OPTIONAL ORDER INFORMATION Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2935CTS8-1 TRMPBF LTC2935CTS8-1 TRPBF LTDPW 8-Lead Plastic TSOT-23 0C to 70C LTC2935ITS8-1 TRMPBF LTC2935ITS8-1 TRPBF LTDPW 8-Lead Plastic TSOT-23 40C to 85C LTC2935CTS8-2 TRMPBF LTC2935CTS8-2 TRPBF LTDQB 8-Lead Plastic TSOT-23 0C to 70C LTC2935ITS8-2 TRMPBF LTC2935ITS8-2 TRPBF LTDQB 8-Lead Plastic TSOT-23 40C to 85C LTC2935CTS8-3 TRMPBF LTC2935CTS8-3 TRPBF LTFHV 8-Lead Plastic TSOT-23 0C to 70C LTC2935ITS8-3 TRMPBF LTC2935ITS8-3 TRPBF LTFHV 8-Lead Plastic TSOT-23 40C to 85C LTC2935CTS8-4 TRMPBF LTC2935CTS8-4 TRPBF LTFHX 8-Lead Plastic TSOT-23 0C to 70C LTC2935ITS8-4 TRMPBF LTC2935ITS8-4 TRPBF LTFHX 8-Lead Plastic TSOT-23 40C to 85C LTC2935CDC-1 TRMPBF LTC2935CDC-1 TRPBF LDPX 0C to 70C 8-Lead (2mm 2mm) Plastic DFN LTC2935IDC-1 TRMPBF LTC2935IDC-1 TRPBF LDPX 8-Lead (2mm 2mm) Plastic DFN 40C to 85C LTC2935CDC-2 TRMPBF LTC2935CDC-2 TRPBF LDQC 0C to 70C 8-Lead (2mm 2mm) Plastic DFN LTC2935IDC-2 TRMPBF LTC2935IDC-2 TRPBF LDQC 40C to 85C 8-Lead (2mm 2mm) Plastic DFN LTC2935CDC-3 TRMPBF LTC2935CDC-3 TRPBF LFHW 8-Lead (2mm 2mm) Plastic DFN 0C to 70C LTC2935IDC-3 TRMPBF LTC2935IDC-3 TRPBF LFHW 40C to 85C 8-Lead (2mm 2mm) Plastic DFN LTC2935CDC-4 TRMPBF LTC2935CDC-4 TRPBF LFHY 8-Lead (2mm 2mm) Plastic DFN 0C to 70C LTC2935IDC-4 TRMPBF LTC2935IDC-4 TRPBF LFHY 8-Lead (2mm 2mm) Plastic DFN 40C to 85C TRM = 500 pieces. *Temperature grades are identi ed by a label on the shipping container. Consult LTC Marketing for parts speci ed with wider operating temperature ranges. Consult LTC Marketing for information on lead based nish parts. For more information on lead free part marking, go to: