LTC2934 Ultra-Low Power Adjustable Supervisor with Power-Fail Output FEATURES DESCRIPTION n 500nA Quiescent Current The LTC 2934 ultra-low power voltage monitor provides n 1.5% (Max) Accuracy over Temperature system initialization, power-fail warning and reset gen- n Operates Down to 1.6V Supply eration functions. Low quiescent current (500nA typical) n Adjustable Reset Threshold makes the LTC2934 an ideal choice for battery-operated n Adjustable Power-Fail Threshold applications. n Early Warning Power-Fail Output Precision power-fail and reset voltages can be con gured n Selectable 15ms or 200ms Reset Timeout independently. Early warning of an impending low volt- n Manual Reset Input age condition is provided at the power-fail output (PFO) n Compact 8-Lead, 2mm 2mm DFN and TSOT-23 when the PFI input falls below 0.4V. Supervisory circuits (ThinSOT) Packages monitor the ADJ input and pull RST low when ADJ falls below 0.4V. When ADJ is rising from an under-threshold condition, an internal reset timer is started after exceeding APPLICATIONS the ADJ threshold by 5%. The reset timeout delays the n Portable Equipment return of the RST output to a high state. A pushbutton n Battery-Powered Equipment switch connected to the MR input is typically used to n Security Systems force a manual reset. Outputs RST and PFO are available n Point-of-Sale Devices with open-drain (LTC2934-1) or active pull-up circuits n Wireless Systems (LTC2934-2). Operating temperature range is from 40C , LT, LTC, LTM are registered trademarks of Linear Technology Corporation. ThinSOT is to 85C. a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Con gurable Low Power Voltage Supervisor Selectable Reset Timeout Period V IN 750k V CC V CC PFO ADJ 0.1F BATTERY 11.8k 15ms LTC2934-2 POWERED RST, RT = GND PFI SYSTEM LOGIC 237k 200ms MR RST RST, RT = V CC RT GND 2934 TA01b 2934 TA01a POWER FAILFALLING THRESHOLD = 1.686V RESET FALLING THRESHOLD = 1.606V 2934f 1LTC2934 ABSOLUTE MAXIMUM RATINGS (Note 1) RMS Currents Input Voltages PFO, RST ..........................................................5mA V ........................................................... 0.3V to 6V CC Operating Ambient Temperature Range ADJ, PFI ................................................... 0.3V to 6V LTC2934C ................................................ 0C to 70C RT, MR ......................................0.3V to (V + 0.3V) CC LTC2934I.............................................. 40C to 85C Output Voltages Storage Temperature Range ................... 65C to 150C PFO, RST (LTC2934-1)............................. 0.3V to 6V Lead Temperature (Soldering, 10 sec) PFO, RST (LTC2934-2)..............0.3V to (V + 0.3V) CC TSOT-23 Package ..............................................300C PIN CONFIGURATION TOP VIEW TOP VIEW V 1 8 ADJ CC ADJ 1 8 V CC MR 2 7 PFI 9 PFI 2 7 MR RST 3 6 RT RT 3 6 RST PFO 4 5 GND GND 4 5 PFO TS8 PACKAGE DC PACKAGE 8-LEAD PLASTIC TSOT-23 8-LEAD (2mm 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 LTC2934CTS8-1 TRMPBF LTC2934CTS8-1 TRPBF LTDKR 8-Lead Plastic TSOT-23 0C to 70C LTC2934ITS8-1 TRMPBF LTC2934ITS8-1 TRPBF LTDKR 8-Lead Plastic TSOT-23 40C to 85C LTC2934CTS8-2 TRMPBF LTC2934CTS8-2 TRPBF LTDKS 8-Lead Plastic TSOT-23 0C to 70C LTC2934ITS8-2 TRMPBF LTC2934ITS8-2 TRPBF LTDKS 8-Lead Plastic TSOT-23 40C to 85C LTC2934CDC-1 TRMPBF LTC2934CDC-1 TRPBF LDKT 8-Lead (2mm 2mm) Plastic DFN 0C to 70C LTC2934IDC-1 TRMPBF LTC2934IDC-1 TRPBF LDKT 8-Lead (2mm 2mm) Plastic DFN 40C to 85C LTC2934CDC-2 TRMPBF LTC2934CDC-2 TRPBF LDKV 8-Lead (2mm 2mm) Plastic DFN 0C to 70C LTC2934IDC-2 TRMPBF LTC2934IDC-2 TRPBF LDKV 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: