RT9811-23CB

Preliminary RT9811 Micro-Power Voltage Detectors General Description The RT9811 is a micro-power voltage detector with de-glitched manual reset input 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 RT9811 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. To pull reset signal low manually, just pull the manual reset input (MR) below the specified VIL level. RT9811 is provided in SOT-25 package. 1 2 3 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 100nS Glitch Immunity of Manual Reset Input Low Functional Supply Voltage 0.9V Small 4-Pin SOT-25 Package Pin Configurations Part Number RT9811(SOT-25) CB Pin Configurations TOP VIEW 5 4 1. 2. 3. 4. 5. GND NC RESET MR VDD Applications Computers Controllers Intelligent Instruments Critical µP and µC Power Monitoring Portable/Battery-Powered Equipment Typical Application Circuit VDD µP RESET RT9811 GND VDD Ordering Information RT9811Package Type B : SOT-25 Operating temperature range C: Commercial standard Reset Threshold 15 : 1.5V 16 : 1.6V : 49 : 4.9V 50 : 5.0V RESET MR DS9811-00 June 2001 www.richtek-ic.com.tw 1 RT9811 Pin Description Pin Name GND NC RESET MR VDD Pin Function Ground Pin Not Connected Preliminary Reset Pulse Output, Negative Pulse Manual Reset Input, Pull Low to Reset, Internally Pulled High with 1µA Current Source Power Pin Function Block Diagram VDD VDD P VSET CMP TIMER RESET N Threshold Voltage Setting POR Power On Reset MR MR Manual Reset www.richtek-ic.com.tw DS9811-00 June 2001 2 Preliminary Absolute Maximum Ratings Terminal Voltage (with Respect to GND) VDD All Other Inputs Input Current, VDD MR Output Current, RESET Power Dissipation, PD @ TA = 25°C SOT-25 Operating Junction Temperature Range Storage Temperature Range Package Thermal Resistance SOT-25, θJA Lead Temperature (Soldering, 5sec.) RT9811 -0.3V to 6.0V -0.3V to VDD+0.3V 20mA 1mA 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 MR Minimum Pulse Width MR to Reset Delay MR Glitch Immunity MR Input Threshold RESET Output Voltage Note1: 1.5V ~ 5V, step 0.1V VIH VIL VOH VOL VDD > VTH, ISOURCE > 1mA VDD < VTH, ISINK > 3.5mA VDD = 3.3V Symbol VDD IDD VTH ∆VTH tRD tRP tMR tMD 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 Determined by tRP Test Conditions Min 0.9 -------------Typ -2.5 Note1 -25 5 400 400 0.8 100 0.85VDD 0.2VDD 0.8VDD 0.2VDD Max 6 --2 ----------Units V µA V % µS mS mS µS nS V V DS9811-00 June 2001 www.richtek-ic.com.tw 3 RT9811 Package Information Preliminary D C B b A e L H A1 Symbol A A1 B b C D e H L Dimensions In Millimeters Min 0.889 0.000 1.397 0.356 2.591 2.692 0.838 0.102 0.356 Max 1.295 0.152 1.803 0.559 2.997 3.099 1.041 0.254 0.610 Dimensions In Inches Min 0.035 0.000 0.055 0.014 0.102 0.106 0.033 0.004 0.014 Max 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024 SOT- 25 Surface Mount Package www.richtek-ic.com.tw DS9811-00 June 2001 4 Preliminary RT9811 DS9811-00 June 2001 www.richtek-ic.com.tw 5 RT9811 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 DS9811-00 June 2001 6