RT9811 Preliminary Micro-Power Voltage Detectors General Description Features The RT9811 is a micro-power voltage detector with z de-glitched manual reset input supervising the power Internally Fixed Threshold 1.5V to 5V in 0.1V Step supply voltage level for microprocessors (µP) or z digital systems. It provides internally fixed threshold z ±2% Accuracy Low Supply Current 2.5µ µA levels with 0.1V per step ranging from 1.5V to 5V, z No External Components Required which covers most digital applications. It features low z Quick Reset within 20µ µS supply current of 2.5µA. z Built-in Recovery Delay 400mS z 100nS Glitch Immunity of Manual Reset Input The RT9811 performs supervisory function by z Low Functional Supply Voltage 0.9V sending out a reset signal whenever the VDD voltage z Small 4-Pin SOT-25 Package 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 Pin Configurations Part Number time. A 5% hysteresis splits the rising and falling RT9811- CB threshold levels. To pull reset signal low manually, (SOT-25) Pin Configurations TOP VIEW 5 4 1. 2. 3. 4. 5. just pull the manual reset input (MR) below the specified VIL level. 1 2 3 GND NC RESET MR VDD RT9811 is provided in SOT-25 package. Typical Application Circuit Applications z Computers z Controllers z Intelligent Instruments z Critical µP and µC Power Monitoring z Portable/Battery-Powered Equipment Ordering Information VDD RT9811 GND VDD µP RESET RESET MR RT9811- Package Type B : SOT-25 Operating temperature range C: Commercial standard Reset Threshold 15 : 1.5V 16 : 1.6V : 49 : 4.9V 50 : 5.0V DS9811-00 June 2001 www.richtek-ic.com.tw 1 RT9811 Preliminary Pin Description Pin Name Pin Function GND Ground Pin NC Not Connected RESET Reset Pulse Output, Negative Pulse MR Manual Reset Input, Pull Low to Reset, Internally Pulled High with 1µA Current Source VDD Power Pin Function Block Diagram VDD VDD P CMP VSET TIMER N RESET Threshold Voltage Setting POR Power On Reset MR MR Manual Reset www.richtek-ic.com.tw 2 DS9811-00 June 2001 RT9811 Preliminary Absolute Maximum Ratings z Terminal Voltage (with Respect to GND) VDD -0.3V to 6.0V All Other Inputs -0.3V to VDD+0.3V z Input Current, VDD 20mA z MR 1mA z Output Current, RESET 20mA z Power Dissipation, PD @ TA = 25°C SOT-25 0.25W z Operating Junction Temperature Range -40°C ~ 125°C z Storage Temperature Range -65°C ~ 125°C z Package Thermal Resistance z SOT-25, θJA 250°C /W Lead Temperature (Soldering, 5sec.) 260°C Electrical Characteristics (VDD = 3.0, unless specified) Parameter Symbol Test Conditions Min Typ Max Units 0.9 -- 6 V Operating VDD (VOUT) Range VDD Supply Current IDD VDD = 1.5V ~ 5V, IOUT = 0 -- 2.5 -- µA Reset Threshold VTH TA = 27°C -- Note1 -- V Threshold Voltage Accuracy ∆VTH TA = 27°C -- -- 2 % VCC Drop to Reset Delay tRD VDD = 5V, Drop = -20mV -- 25 -- VDD = 1.5V, Drop = -20mV -- 5 -- Reset Active Time Out Period tRP VDD ≥ 1.02×VTH -- 400 -- mS MR Minimum Pulse Width tMR Determined by tRP -- 400 -- mS MR to Reset Delay tMD -- 0.8 -- µS -- 100 -- nS -- 0.85VDD -- -- 0.2VDD -- MR Glitch Immunity MR Input Threshold RESET Output Voltage VIH VDD = 3.3V VIL VOH VDD > VTH, ISOURCE > 1mA -- 0.8VDD -- VOL VDD < VTH, ISINK > 3.5mA -- 0.2VDD -- µS V V Note1: 1.5V ~ 5V, step 0.1V DS9811-00 June 2001 www.richtek-ic.com.tw 3 RT9811 Preliminary Package Information D C B b H A e Symbol L A1 Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 0.889 1.295 0.035 0.051 A1 0.000 0.152 0.000 0.006 B 1.397 1.803 0.055 0.071 b 0.356 0.559 0.014 0.022 C 2.591 2.997 0.102 0.118 D 2.692 3.099 0.106 0.122 e 0.838 1.041 0.033 0.041 H 0.102 0.254 0.004 0.010 L 0.356 0.610 0.014 0.024 SOT- 25 Surface Mount Package www.richtek-ic.com.tw 4 DS9811-00 June 2001 Preliminary DS9811-00 June 2001 RT9811 www.richtek-ic.com.tw 5 RT9811 Preliminary RICHTEK TECHNOLOGY CORP. RICHTEK TECHNOLOGY CORP. Headquarter Taipei Office (Marketing) 6F, No. 35, Hsintai Road, Chupei City 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Hsinchu, Taiwan, R.O.C. Taipei County, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749 Tel: (8862)89191466 Fax: (8862)89191465 Email: [email protected] www.richtek-ic.com.tw 6 DS9811-00 June 2001