RT9819 Micro-Power Voltage Detectors General Description Features zz z zz Internally Fixed Threshold 1.2V to 5V in 0.1V Step The RT9819 is a micro-power voltage detector supervising zz z zz High Accuracy 1.5% the power supply voltage level for microprocessors (P) zz z zz Low Supply Current 3A or digital systems. It provides internally fixed threshold zz z zz No External Components Required levels with 0.1V per step ranging from 1.2V to 5V, which zz z zz Quick Reset within 20s covers most digital applications. It features low supply zz z zz Built-in Recovery Delay Include 0ms, 55ms, 220ms, current of 3A. The RT9819 performs supervisory function 450ms Options by sending out a reset signal whenever the V voltage DD zz z zz Low Functional Supply Voltage 0.9V falls below a preset threshold level. This reset signal will zz z zz CMOS Push-Pull Output last the whole period before V recovering. Once V DD DD zz z zz Small SC-70-3, SC-82, SOT-23-3 and WDFN-6L recovered upcrossing the threshold level, the reset signal 1.6x1.6 Packages will be released after a certain delay time. The RT9819 is zz z zz RoHS Compliant and Halogen Free provided in SC-70-3, SC-82, SOT-23-3 and WDFN-6L 1.6x1.6 packages. Applications Ordering Information z Computers - RT9819 z Controllers Package Type z Intelligent Instruments U3 : SC-70-3 z Critical P and C Power Monitoring V : SOT-23-3 VL : SOT-23-3 (L-Type) z Portable/Battery-Powered Equipment Y : SC-82 YR : SC-82 (R-Type) Typical Application Circuit QW : WDFN-6L 1.6x1.6 (W-Type) Lead Plating System P : Pb Free RT9819 G : Green (Halogen Free and Pb Free) VDD GND VDD Threshold Voltage up 12 : 1.2V RESET/ RESET/ 13 : 1.3V RESET RESET : 49 : 4.9V 50 : 5.0V Reset Active Timeout Period A = 0ms (RESET) Marking Information B = 55ms (RESET) For marking information, contact our sales representative C = 220ms (RESET) D = 450ms (RESET) directly or through a Richtek distributor located in your E = 0ms (RESET) area. F = 55ms (RESET) G = 220ms (RESET) H = 450ms (RESET) Note : Richtek products are : RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS9819-08 July 2013 www.richtek.com 1RT9819 Pin Configurations (TOP VIEW) VDD VDD 3 3 2 2 GND GND RESET/ RESET/ RESET RESET SC-70-3 SOT-23-3 VDD GND NC 3 4 3 2 2 GND VDD RESET/ RESET/ RESET RESET SC-82 SOT-23-3 (L-Type) RESET/ NC RESET 4 3 NC 1 6 VDD 2 NC 2 5 NC 7 3 4 GND RESET/ VDD GND RESET SC-82 (R-Type) WDFN-6L 1.6x1.6 Functional Pin Description Pin Name Pin Function GND Ground. RESET Active Low Push-Pull Reset Output. RESET Active High Push-Pull Reset Output VDD Power Input. NC No Internal Connection. Function Block Diagram VDD VDD P MOS RESET/ CMP Timer VSET RESET N MOS Threshold Voltage Setting POR Power On Reset Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS9819-08 July 2013 2 GND
