RT9801 Preliminary User Programmable Micro-Power Voltage Detectors General Description Features The RT9801 is a micro-power voltage detector z User Programmable Threshold 1.5V to 5V in 0.1V Step with ±3% Accuracy supervising the power supply voltage level for microprocessors (µP) or digital systems. It provides z Low Supply Current 3µ µA user programmable threshold levels with 0.1V step z Quick Reset within 20µ µS ranging from 1.5V to 5V, which covers most digital z Built-in Recovery Delay 200mS applications. It features low supply current of 3µA. z Low Functional Supply Voltage 0.9V Selection of VTH is easily achieved through 3 pins z Small SOT-26 Package connected to GND, VDD or floating for different threshold voltage settings. Two versions of threshold Applications voltages, 1.5V ~ 4V and 2.5V ~ 5V, which are z Computers programmed in factory are offered by customer z Controllers demands. z Intelligent Instruments z Critical µP and µC Power Monitoring z Portable/Battery-Powered Equipment The RT9801 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. Reset signal will release after VDD is recovered and Pin Configurations Part Number lasts for the whole period of Reset Active Time-out RT9801 CE period. (Plastic SOT-26) RT9801 is N-channel, open-drain output and provided in SOT-26 package. Pin Configurations TOP VIEW 6 5 4 1 2 3 1. 2. 3. 4. 5. 6. Ordering Information RT9801 Package Type E : SOT-26 VSET0 GND RESET VDD VSET2 VSET1 Typical Application Circuit Operating temperature range C: Commercial standard Reset Threshold A : 2.5V~5V B : 1.5V~4V VSET0 VSET1 µP GND RT9801 GND VSET2 VDD RESET RESET VDD Pull Up RT9801B V TH = 2.5V in this example DS9801-00 January 2002 www.richtek-ic.com.tw 1 RT9801 Preliminary Pin Description Pin Name Pin Function VSET0 Threshold Voltage Selection Pin 1 GND Ground Pin RESET Reset Pulse Output, Negative Pulse VDD Power Pin VSET1 Threshold Voltage Selection Pin 2 VSET2 Threshold Voltage Selection Pin 3 Function Block Diagram Internal Clock VDD VSET0 VSET1 VSET CMP TIMER N RESET VSET2 Threshold Voltage Setting POR Power On Reset www.richtek-ic.com.tw 2 DS9801-00 January 2002 RT9801 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 Continuous Power Dissipation, PD @ TA = 25°C SOT-26 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-26, 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 ~ 3.5V, IOUT = 0 VDD = 3.5V ~ 5V, IOUT = 0 -- Reset Threshold VTH TA = 27°C -- Threshold Voltage Accuracy ∆VTH TA = 27°C -- VCC Drop to Reset Delay tRD Drop = -125mV -- Reset Active Time Out Period tRP VDD ≥ 1.02×VTH, Programmable VIL VSET Pin Input Threshold RESET Output Voltage DS9801-00 January 2002 3 3.3 Note1 µA -- V 3 % -- 20 µS -- 200 -- mS TA = 27°C -- 0.15VDD -- VIH TA = 27°C -- 0.85VDD -- VOL VDD < VTH, ISINK = 3.5mA -- 0.4 -- V V www.richtek-ic.com.tw 3 RT9801 Preliminary Note 1: Pin Conditions for Programmable Threshold Voltage Setting RT9801A RT9801B Vset0 input Vset1 input Vset2 input 5 4 VDD VDD VDD 4.9 3.9 VDD VDD floating 4.8 3.8 VDD VDD GND 4.7 3.7 VDD floating VDD 4.6 3.6 VDD floating floating 4.5 3.5 VDD floating GND 4.4 3.4 VDD GND VDD 4.3 3.3 VDD GND floating 4.2 3.2 VDD GND GND 4.1 3.1 floating VDD VDD 4 3 floating VDD floating 3.9 2.9 floating VDD GND 3.8 2.8 floating floating VDD 3.7 2.7 floating floating floating 3.6 2.6 floating floating GND 3.5 2.5 floating GND VDD 3.4 2.4 floating GND floating 3.3 2.3 floating GND GND 3.2 2.2 GND VDD VDD 3.1 2.1 GND VDD floating 3 2 GND VDD GND 2.9 1.9 GND floating VDD 2.8 1.8 GND floating floating 2.7 1.7 GND floating GND 2.6 1.6 GND GND VDD 2.5 1.5 GND GND floating VDD: bond to VDD; 0: bond to GND; f: no bonding www.richtek-ic.com.tw 4 DS9801-00 January 2002 RT9801 Preliminary Package Information D C B b H A A1 e Symbol L Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 0.889 1.295 0.035 0.051 A1 -- 0.152 -- 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- 26 Surface Mount Package DS9801-00 January 2002 www.richtek-ic.com.tw 5 RT9801 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 DS9801-00 January 2002