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| Preliminary RT9801 User Programmable Micro-Power Voltage Detectors General Description The RT9801 is a micro-power voltage detector supervising the power supply voltage level for microprocessors (P) or digital systems. It provides user programmable threshold levels with 0.1V step ranging from 1.5V to 5V, which covers most digital applications. It features low supply current of 3A. Selection of VTH is easily achieved through 3 pins connected to GND, VDD or floating for different threshold voltage settings. Two versions of threshold voltages, 1.5V ~ 4V and 2.5V ~ 5V, which are programmed in factory are offered by customer demands. 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 lasts for the whole period of Reset Active Time-out period. RT9801 is N-channel, open-drain output and Features User Programmable Threshold 1.5V to 5V in 0.1V Step with 3% Accuracy Low Supply Current 3A Quick Reset within 20S Built-in Recovery Delay 200mS Low Functional Supply Voltage 0.9V Small SOT-26 Package Applications Computers Controllers Intelligent Instruments Critical P and C Power Monitoring Portable/Battery-Powered Equipment Pin Configurations Part Number RT9801 CE (Plastic SOT-26) Pin Configurations TOP VIEW 6 5 4 provided in SOT-26 package. 1 2 3 Ordering Information RT9801 Package Type E : SOT-26 Operating temperature range C: Commercial standard Reset Threshold A : 2.5V~5V B : 1.5V~4V 1. 2. 3. 4. 5. 6. VSET0 GND RESET VDD VSET2 VSET1 Typical Application Circuit VSET0 VSET1 P GND VDD RESET RESET Pull Up RT9801B V TH = 2.5V in this example VDD RT9801 GND VSET2 DS9801-00 January 2002 www.richtek-ic.com.tw 1 RT9801 Pin Description Pin Name VSET0 GND RESET VDD VSET1 VSET2 Pin Function Threshold Voltage Selection Pin 1 Ground Pin Preliminary Reset Pulse Output, Negative Pulse Power Pin Threshold Voltage Selection Pin 2 Threshold Voltage Selection Pin 3 Function Block Diagram Internal Clock VDD VSET0 VSET1 VSET2 Threshold Voltage Setting POR Power On Reset VSET CMP TIMER RESET N www.richtek-ic.com.tw DS9801-00 January 2002 2 Preliminary Absolute Maximum Ratings Terminal Voltage (with Respect to GND) VDD All Other Inputs Input Current, VDD Continuous Power Dissipation, PD @ TA = 25C SOT-26 Operating Junction Temperature Range Storage Temperature Range Package Thermal Resistance SOT-26, JA Lead Temperature (Soldering, 5sec.) RT9801 -0.3V to 6.0V -0.3V to VDD+0.3V 20mA 0.25W -40C ~ 125C -65C ~ 125C 250C /W 260C 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 Symbol VDD IDD VTH VTH tRD tRP VIL VSET Pin Input Threshold VIH VOL VDD = 1.5V ~ 3.5V, IOUT = 0 VDD = 3.5V ~ 5V, IOUT = 0 TA = 27C TA = 27C Drop = -125mV VDD 1.02xVTH, Programmable TA = 27C TA = 27C VDD < VTH, ISINK = 3.5mA Test Conditions Min 0.9 ---------200 0.15VDD 0.85VDD 0.4 Note1 Typ -Max 6 3 3.3 -3 20 ----V Units V A V % S mS RESET Output Voltage V DS9801-00 January 2002 www.richtek-ic.com.tw 3 RT9801 RT9801A 5 4.9 4.8 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3 2.9 2.8 2.7 2.6 2.5 RT9801B 4 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2 1.9 1.8 1.7 1.6 1.5 Preliminary Note 1: Pin Conditions for Programmable Threshold Voltage Setting Vset0 input VDD VDD VDD VDD VDD VDD VDD VDD VDD floating floating floating floating floating floating floating floating floating GND GND GND GND GND GND GND GND Vset1 input VDD VDD VDD floating floating floating GND GND GND VDD VDD VDD floating floating floating GND GND GND VDD VDD VDD floating floating floating GND GND Vset2 input VDD floating GND VDD floating GND VDD floating GND VDD floating GND VDD floating GND VDD floating GND VDD floating GND VDD floating GND VDD floating VDD: bond to VDD; 0: bond to GND; f: no bonding www.richtek-ic.com.tw DS9801-00 January 2002 4 Preliminary Package Information RT9801 D C B b A e 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 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 -0.055 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- 26 Surface Mount Package DS9801-00 January 2002 www.richtek-ic.com.tw 5 RT9801 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 DS9801-00 January 2002 6 |
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