RT9809-50CV

Preliminary RT9809 Micro-Power Voltage Detectors General Description The RT9809 is a micro-power voltage detector supervising the power supply voltage level for microprocessors (µP) or digital systems. It provides internally fixed threshold levels with 0.1V per step ranging from 1.5V to 5V, which covers most digital applications. It features low supply current of 2.5µA. The RT9809 performs supervisory function by sending out a reset signal whenever the VDD voltage falls below a preset threshold level. This reset signal will last the whole period before VDD recovering. Once VDD recovered up-crossing the threshold level, the reset signal will be released after a certain delay time. A 5% hysteresis splits the rising and falling threshold levels. RT9809 is provided in SOT-23 package. Features Internally Fixed Threshold 1.5V to 5V in 0.1V Step ±2% Accuracy Low Supply Current 2.5µA No External Components Required Quick Reset within 20µS Built-in Recovery Delay 400mS Low Functional Supply Voltage 0.9V Small 3-Pin SOT-23 Package Pin Configurations Part Number RT9809(SOT-23) 1 2 Pin Configurations TOP VIEW 3 CV 1. GND 2. RESET 3. VDD Applications Computers Controllers Intelligent Instruments Critical µP and µC Power Monitoring Portable/Battery-Powered Equipment Typical Application Circuit VDD µP RESET RESET RT9809 GND VDD Ordering Information RT9809Package Type V : SOT-23 Operating temperature range C: Commercial standard Reset Threshold 15 : 1.5V 16 : 1.6V : 49 : 4.9V 50 : 5.0V DS9809-00 June 2001 www.richtek-ic.com.tw 1 RT9809 Pin Description Pin Name GND RESET VDD Pin Function Ground Pin Preliminary Reset Pulse Output, Negative Pulse Power Pin Function Block Diagram VDD VDD P VSET CMP TIMER RESET N Threshold Voltage Setting POR Power On Reset www.richtek-ic.com.tw DS9809-00 June 2001 2 Preliminary Absolute Maximum Ratings Terminal Voltage (with Respect to GND) VDD All Other Inputs Input Current, VDD Output Current, RESET Power Dissipation, PD @ TA = 25°C SOT-23 Operating Junction Temperature Range Storage Temperature Range Package Thermal Resistance SOT-23, θJA Lead Temperature (Soldering, 5sec.) RT9809 -0.3V to 6.0V -0.3V to VDD+0.3V 20mA 20mA 0.25W -40°C ~ 125°C -65°C ~ 125°C 250°C /W 260°C Electrical Characteristics (VDD = 3.0, unless specified) Parameter Operating VDD (VOUT) Range Supply Current Reset Threshold Threshold Voltage Accuracy VCC Drop to Reset Delay Reset Active Time Out Period RESET Output Voltage Note1: 1.5V ~ 5V, step 0.1V Symbol VDD IDD VTH ∆VTH tRD tRP VOH VOL VDD = 1.5V ~ 5V, IOUT = 0 TA = 27°C TA = 27°C VDD = 5V, Drop = -20mV VDD = 1.5V, Drop = -20mV VDD ≥ 1.02×VTH VDD > VTH, ISOURCE > 1mA VDD < VTH, ISINK > 3.5mA Test Conditions Min 0.9 --------Typ -2.5 Note1 -25 5 400 0.8VDD 0.2VDD Max 6 --2 -----Units V µA V % µS mS V DS9809-00 June 2001 www.richtek-ic.com.tw 3 RT9809 Package Information Preliminary D C B e A b A1 L H Symbol A A1 B b C D e H L Dimensions In Millimeters Min 0.889 -1.397 0.356 2.591 2.692 1.803 0.102 0.356 Max 1.295 0.152 1.803 0.508 2.997 3.099 2.007 0.254 0.610 Dimensions In Inches Min 0.035 -0.055 0.014 0.102 0.106 0.071 0.004 0.014 Max 0.051 0.006 0.071 0.020 0.118 0.122 0.079 0.010 0.024 SOT-23 Plastic Surface Mount www.richtek-ic.com.tw DS9809-00 June 2001 4 Preliminary RT9809 DS9809-00 June 2001 www.richtek-ic.com.tw 5 RT9809 Preliminary RICHTEK TECHNOLOGY CORP. Headquarter 6F, No. 35, Hsintai Road, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749 RICHTEK TECHNOLOGY CORP. Taipei Office (Marketing) 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek-ic.com.tw www.richtek-ic.com.tw DS9809-00 June 2001 6