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| Preliminary RT9808 Micro-Power Voltage Detectors General Description The RT9808 is a micro-power voltage detector supervising the power supply voltage level for microprocessors (P) 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 3A. The RT9808 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 if VDD is above threshold and last for the whole period of reset active time out. RT9808 is n-channel, open-drain output. Features Internally Fixed Threshold 1.5V to 5V in 0.1V Step 2% Accuracy Low Supply Current 3A Quick Reset within 20S Built-in Recovery Delay 200mS Low Functional Supply Voltage 0.9V N-Channel Open Drain Output Small 3-Pin SOT-23/SOT89 and 5-Pin SOT-25 Packages Pin Configurations Part Number RT9808CV 1 Pin Configurations 3 TOP VIEW 1. RESET 2. GND 3. VDD TOP VIEW 1. RESET 2. VDD 3. GND TOP VIEW (Plastic SOT-23) 2 Applications Computers Controllers Intelligent Instruments Critical P and C Power Monitoring Portable/Battery-Powered Equipment RT9808- CX (Plastic SOT-89) 1 2 3 RT9808- CB 5 4 (Plastic SOT-25) Ordering Information RT9808Package Type V : SOT-23 X : SOT-89 B : SOT-25 Operating temperature range C: Commercial standard Reset Threshold 15 : 1.5V 16 : 1.6V : 49 : 4.9V 50 : 5.0V P RESET 1 2 3 1. 2. 3. 4. 5. RESET VDD GND NC NC Typical Application Circuit VDD Pull 100K Up RT9808 GND VDD RESET DS9808-01 January 2002 www.richtek-ic.com.tw 1 RT9808 Pin Description Pin Name GND RESET VDD NC Pin Function Ground Pin Preliminary Reset Pulse Output, Negative Pulse Power Pin No Connected Function Block Diagram VDD VSET CMP TIMER N RESET Threshold Voltage Setting POR Power On Reset www.richtek-ic.com.tw DS9808-01 January 2002 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 = 25C SOT-23 SOT-89 SOT-25 Operating Junction Temperature Range Storage Temperature Range Package Thermal Resistance SOT-23, JA SOT-89, JC SOT-89, JA SOT-25, JA Lead Temperature (Soldering, 5sec.) RT9808 -0.3V to 6.0V -0.3V to VDD+0.3V 20mA 20mA 0.25W 0.5W 0.25W -40C ~ 125C -65C ~ 125C 250C /W 100C /W 300C /W 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 RESET Output Voltage Note1: 1.5V ~ 5V, step 0.1V Symbol VDD IDD VTH VTH tRD tRP VOL VDD = 1.5V ~ 5V, IOUT = 0 TA = 27C TA = 27C Drop = -125mV VDD 1.02xVTH VDD < VTH, ISINK > 3.5mA Test Conditions Min 0.9 ------Typ -3 Note1 --200 0.4 Max 6 --2 20 --Units V A V % S mS V DS9808-01 January 2002 www.richtek-ic.com.tw 3 RT9808 Measuring Circuit (1) Detection Voltage Preliminary (3) Output Transistor Current VDD VDD V RT9808 VSS R (100k) OUT Oscilloscope P.G VDD RT9808 VSS 100k OUT CRT CL 6V (2) Current Consumption (4) Dynamic Response A VDD VDD VDD RT9808 VSS OUT V VDD RT9808 VSS OUT V A VDS V www.richtek-ic.com.tw DS9808-01 January 2002 4 Preliminary Typical Operating Characteristics 7 6 RT9808 Nch Driver Output Current vs. VDS 1.7V 12 10 Nch Driver Output Current vs. VDS 2.2V 2.0V Output Current IOUT (mA) 5 4 3 2 1 0 0 0.5 1 1.5 2 Output Current IOUT (mA) 8 6 4 2 0 1.5V 1.5V TA = 25C RT9808-20CV 2.5 3 TA = 25C RT9808-24CV 0 0.5 1 1.5 2 2.5 3 VDS (V) VDS (V) 18 15 12 9 Nch Driver Output Current vs. VDS 2.8V 36 30 Nch Driver Output Current vs. VDS 4.0V Output Current IOUT (mA) Output Current IOUT (mA) 3.5V 24 3.0V 18 2.5V 12 2.0V 6 1.5V 0 2.0V 6 3 0 0 0.5 1 1.5 2 1.5V TA = 25C RT9808-30CV 2.5 3 TA = 25C RT9808-45CV 2 3 4 0 1 VDS (V) VDS (V) Nch Driver output Current vs. VDS 40 4.0V 3.5V 24 3.0V 16 2.5V 2.0V 1.5V 0 0 1 2 3 4.5V Output Voltage vs. Input Voltage 7 TA = 25C 6 Output Current IOUT (mA) Output Voltage VOUT (V) 32 5.0V 5 4 3.0V 3 2 1 0 0.0 2.0V 2.4V 4.5V 8 TA = 25C RT9808-50CV 4 5 VDS (V) 1.0 2.0 3.0 4.0 5.0 6.0 Input Voltage VIN (V) DS9808-01 January 2002 www.richtek-ic.com.tw 5 RT9808 Supply Current vs. Input Voltage 4 Preliminary Supply Current vs. Input Voltage 4 Supply Current ISS ( A) 3 80C 2 25C -30C 1 Supply Current ISS ( A) 3 80C 2 25C -30 C 1 0 0 1 2 3 4 RT9808-20CV 5 6 0 0 1 2 3 4 RT9808-24CV 5 6 Input Voltage VIN (V) Input Voltage VIN (V) Supply Current vs. Input Voltage 4 Supply Current vs. Input Voltage 5 80C 25C 3 -30C 2 Supply Current ISS ( A) 3 80 C 25C 2 -30 C 1 Supply Current ISS ( A) 4 1 RT9808-45CV 0 1 2 3 4 5 6 0 0 1 2 3 4 RT9808-30CV 5 6 0 Input Voltage VIN (V) Input Voltage VIN (V) Supply Current vs. Input Voltage 5 80C 5.1 4.7 4.3 Reset Threshold Deviation vs. Temp. 5V 4.5V Supply Current ISS ( A) 4 Threshold (V) 25 C 3 -30 C 3.9 3.5 3.1 2.7 2.3 3V 2.4V 2V -40 -15 10 35 60 85 2 1 RT9808-50CV 0 0 1 2 3 4 5 6 1.9 Input Voltage VIN (V) Temperture ( C) www.richtek-ic.com.tw DS9808-01 January 2002 6 Preliminary RT9808 Nch Driver Output Current vs. Input Voltage 10 RT9808-20CV VDS = 0.5V Nch Driver Output Current vs. Input Voltage 10 RT9808-24CV VDS = 0.5V Output Current IOUT (mA) Output Current IOUT (mA) 8 -30C 6 8 -30 C 6 25C 80C 2 4 25C 80C 4 2 0 0 0.5 1 1.5 2 2.5 3 0 0 0.5 1 1.5 2 2.5 3 Input Voltage VIN (V) Input Voltage VIN (V) Nch Driver Output Current vs. Input Voltage 12 10 8 6 80C 4 2 0 0 0.5 1 1.5 2 2.5 3 3.5 RT9808-30CV VDS = 0.5V -30C 25C Nch Driver Output Current vs. Input Voltage 16 14 RT9808-45CV VDS = 0.5V -30 C Output Current IOUT (mA) Output Current IOUT (mA) 12 10 8 6 4 2 0 0 1 2 25C 80 C 3 4 5 Input Voltage VIN (V) Input Voltage VIN (V) Nch Driver Output Current vs. Input Voltage 18 15 12 9 6 3 0 0 1 2 3 4 5 6 25 C RT9808-50CV 350 Power-Up reset Timeout vs. Temp. Power-Up Reset Timeout (ms) 300 2V VDS = 0.5V -30 C Output Current IOUT (mA) 250 200 150 100 50 -40 -15 10 35 60 2.4V 3V 4.5V 5V 80C 85 Input Voltage VIN (V) Temperture ( C) DS9808-01 January 2002 www.richtek-ic.com.tw 7 RT9808 Preliminary Power-Down Reset Delay vs. Temp. 4.0 3.0 Power-Down Reset Delay vs. Temp. Power-Down Reset Delay ( s) Power-Down Reset Delay ( s) 2.5 2.0 1.5 1.0 0.5 0.0 Vdrop = 150mV Vdrop = 200mV Vdrop = 250mV RT9808-24CV -40 -15 10 35 60 85 3.0 2.0 Vdrop = 150mV Vdrop = 200mV 1.0 Vdrop = 250mV RT9808-20CV -40 -15 10 35 60 85 0.0 Temperture ( C) Temperture ( C) Power-Down Reset Delay vs. Temp. 1.5 1.5 Power-Down Reset Delay vs. Temp. Power-Down Reset Delay ( s) Power-Down Reset Delay ( s) 1.2 Vdrop = 200mV Vdrop = 150mV Vdrop = 250mV 1.2 0.9 0.9 Vdrop = 200mV Vdrop = 150mV Vdrop = 250mV 0.6 0.6 0.3 RT9808-30CV -40 -15 10 35 60 85 0.3 RT9808-45CV -40 -15 0.0 0.0 Temperture ( C) Temperture ( C) 10 35 60 85 Power-Down Reset Delay vs. Temp. 1.5 Output Delay Time vs. Load Capacitance 1000 Power-Down Reset Delay ( s) 1.2 Output Delay Time tP (ms) 100 0.9 Vdrop = 200mV Vdrop = 150mV Vdrop = 250mV 0.6 2.4V 10 4.5V 5V 2V 3V 1 0.0001 0.3 RT9808-50CV -40 -15 0.0 TA = 25C 0.001 0.01 0.1 Temperture ( C) 10 35 60 85 Load Capacitance COUT (uF) www.richtek-ic.com.tw DS9808-01 January 2002 8 Preliminary Package Information RT9808 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 DS9808-01 January 2002 www.richtek-ic.com.tw 9 RT9808 Preliminary D D1 A H C B C1 e e A b b1 b Symbol A b B b1 C C1 D D1 e H Dimensions In Millimeters Min 1.397 0.356 2.388 0.406 -0.787 4.394 1.397 1.448 0.381 Max 1.600 0.483 2.591 0.533 4.242 1.194 4.597 1.753 1.549 0.432 Dimensions In Inches Min 0.055 0.014 0.094 0.016 -0.031 0.173 0.055 0.057 0.015 Max 0.063 0.019 0.102 0.021 0.167 0.047 0.181 0.069 0.061 0.017 3-Lead SOT-89 Surface Mount www.richtek-ic.com.tw DS9808-01 January 2002 10 Preliminary RT9808 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 DS9808-01 January 2002 www.richtek-ic.com.tw 11 RT9808 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 DS9808-01 January 2002 12 |
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