LTC2934 Datasheet | Linear Technology

Features n n n n n n n n n LTC2934 Ultra-Low Power Adjustable Supervisor with Power-Fail Output DESCRIPTION The LTC®2934 ultra-low power voltage monitor provides system initialization, power-fail warning and reset generation functions. Low quiescent current (500n A typical) makes the LTC2934 an ideal choice for battery-operated applications. Precision power-fail and reset voltages can be configured independently. Early warning of an impending low voltage condition is provided at the power-fail output (PFO) when the PFI input falls below 0.4V. Supervisory circuits 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 the ADJ threshold by 5%. The reset timeout delays the return of the RST output to a high state. A pushbutton switch connected to the MR input is typically used to force a manual reset. Outputs RST and PFO are available with open-drain (LTC2934-1) or active pull-up circuits (LTC2934-2). Operating temperature range is from - 40ºC to 85ºC. 500n A Quiescent Current ±1.5% (Max) Accuracy over Temperature Operates Down to 1.6V Supply Adjustable Reset Threshold Adjustable Power-Fail Threshold Early Warning Power-Fail Output Selectable 15ms or 200ms Reset Timeout Manual Reset Input pact 8-Lead, 2mm × 2mm DFN and TSOT-23 (Thin SOT™) Packages APPLICATIONS n n n n n Portable Equipment Battery-Powered Equipment Security Systems Point-of-Sale Devices Wireless Systems , LT, LTC, LTM are registered trademarks of Linear Technology Corporation. Thin SOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. .. TYPICAL APPLICATION Configurable Low Power Voltage Supervisor Selectable Reset Timeout Period VIN 750k 0.1μF 11.8k PFI 237k MR RT GND 2934 TA01a VCC ADJ LTC2934-2 PFO BATTERY POWERED SYSTEM LOGIC RST VCC 15ms RST, RT = GND 200ms 2934 TA01b RST, RT = VCC POWER FAIL...