RT9818G-49GY

RT9818 Micro-Power Voltage Detectors General Description The RT9818 is a micro-power voltage detector 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 1.2V to 5V, which covers most digital applications. It features low supply current of 3μA. The RT9818 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 upcrossing the threshold level, the reset signal will be released after a certain delay time. RT9818 is provided in SC-82, SC-70-3, SOT-23-3, SOT-23-5 and SOT-89 packages. Features Internally Fixed Threshold 1.2V to 5V in 0.1V Step High Accuracy ±1.5% Low Supply Current 3μA No External Components Required Quick Reset within 20μs Built-in Recovery Delay Include 0ms, 55ms, 220ms, 450ms Options Low Functional Supply Voltage 0.9V N-Channel Open-Drain Output Small SC-82, SC-70-3, SOT-23-3, SOT-23-5, SOT-89 Packages RoHS Compliant and 100% Lead (Pb)-Free Applications Computers Controllers Intelligent Instruments Critical μP and μC Power Monitoring Portable/Battery-Powered Equipment Ordering Information RT9818 Package Type U3 : SC-70-3 V : SOT-23-3 VL : SOT-23-3 (L-Type) B : SOT-23-5 X : SOT-89 Y : SC-82 YR : SC-82 (R-Type) Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Threshold Voltage 12 : 1.2V 13 : 1.3V : 49 : 4.9V 50 : 5.0V Reset Active Timeout Period A = 0ms (RESET) B = 55ms (RESET) C = 220ms (RESET) D = 450ms (RESET) E = 0ms (RESET) F = 55ms (RESET) G = 220ms (RESET) H = 450ms (RESET) Marking Information For marking information, contact our sales representative directly or through a RichTek distributor located in your area, otherwise visit our website for detail. Typical Application Circuit 100k Pull Up VDD μP RESET/ RESET RT9818 GND VDD RESET/ RESET Note : RichTek Pb-free and Green products are : RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. 100%matte tin (Sn) plating. DS9818-05 March 2007 www.richtek.com 1 RT9818 Pin Configurations (TOP VIEW) RESET/ RESET 4 1 VDD VDD VDD 3 GND 4 1 RESET/ RESET NC 3 2 VDD NC 3 2 GND 1 GND VDD 3 2 RESET/ RESET 3 1 RESET/ RESET 2 GND 1 GND 2 RESET/ RESET SC-82 SC-82 (R-Type) SC-70-3 SOT-23-3 SOT-23-3 (L-Type) NC 5 1 2 NC 4 3 Note : There is no pin1 indicator on top mark for SC-82 type, 1 2 3 and pin 1 will be lower left pin when reading top mark from left to right. Pin2 of SC-82 is wider than other pins. RESET/ VDD GND RESET RESET/ VDD RESET GND SOT-23-5 SOT-89 Functional Pin Description Pin Name GND RESET RESET VDD Pin Function Ground Active Low Open-Drain Reset Output Active High Open-Drain Reset Output Power Pin Function Block Diagram VDD RESET/ RESET VSET Threshold Voltage Setting POR Power On Reset CMP Timer N MOS GND www.richtek.com 2 DS9818-05 March 2007 RT9818 Absolute Maximum Ratings (Note 1) Terminal Voltage (with Respect to GND) VDD ------------------------------------------------------------------------------------------------------------------------ −0.3V to 6.0V All Other Inputs -------------------------------------------------------------------------------------------------------- −0.3V to VDD+0.3V Input Current, IVDD ----------------------------------------------------------------------------------------------------- 20mA Power Dissipation, PD @ TA = 25°C SC-70 / SC-82 ---------------------------------------------------------------------------------------------------------- 0.25W SOT-23-3 ---------------------------------------------------------------------------------------------------------------- 0.4W SOT-23-5 ---------------------------------------------------------------------------------------------------------------- 0.4W SOT-89 ------------------------------------------------------------------------------------------------------------------- 0.55W Package Thermal Resistance (Note 4) SC-70 / SC-82, θJA ---------------------------------------------------------------------------------------------------- 400°C/W SOT-23-3, θJA ----------------------------------------------------------------------------------------------------------- 250°C/W SOT-23-5, θJA ----------------------------------------------------------------------------------------------------------- 250°C/W SOT-89, θJA ------------------------------------------------------------------------------------------------------------- 180°C/W Lead Temperature (Soldering, 10sec.) ---------------------------------------------------------------------------- 260°C Storage Temperature Range ---------------------------------------------------------------------------------------- −65°C to 125°C ESD Susceptibility (Note 2) HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V Recommended Operating Conditions (Note 3) Junction Temperature Range ---------------------------------------------------------------------------------------- −40°C to 125°C Ambient Temperature Range ---------------------------------------------------------------------------------------- −40°C to 85°C Electrical Characteristics (VDD = 3V, unless otherwise specified) Parameter O perating VDD (V OUT ) Range S upply Current Reset Threshold Threshold Voltage Accuracy V DD Drop to Reset Delay RT9818A/E Reset Active Time Out Period RT9818B/F RT9818C/G RT9818D/H Symbol VDD IDD VTH ΔVTH tRD Test Conditions Min 0.9 Typ -3 1.2 to 5.0 -20 0 55 220 450 -0 .01V TH Max 6 8 -+1.5 --75 297 608 0.4 Units V μA V % μs VTH = 3V , VDD = 4.5V TA = 27° C TA = 27° C TA = 2 7°C Drop = V TH -125mV --−1.5 --- tRP VDD ≥ 1.02×VTH 35 143 292 ms RESET Output Voltage Low (Note 5) VOL Hysteresis Width VHYS 3 = VDD < V TH ISINK >3.5mA -- V V DS9818-05 March 2007 www.richtek.com 3 RT9818 Note 1. Stresses listed as the above “ Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2. Devices are ESD sensitive. Handling precaution recommended. Note 3. The device is not guaranteed to function outside its operating conditions. Note 4. θJA i s measured in the natural convection at T A = 25 °C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Note 5. The voltage VOL can be calculated by VOL = VDD − Ir * R. Where R is the pull-up resistor and Ir is the current flowing through the pull-up resistor. For typical application (R=100kΩ), VOL is less than 0.2V. www.richtek.com 4 DS9818-05 March 2007 RT9818 Typical Operating Characteristics Nch Driver Output Current vs. VDS 2.4 Nch Driver Output Current vs. VDS 60 RT9818A-12 VDD = 1.1V RT9818C-30 VDD = 2.8V VDD = 2.5V Output Current (mA) 2 1.6 1.2 0.8 0.4 0 0 0.3 0.6 0.9 50 Output Current (mA) 40 30 VDD = 2.0V 20 10 0 VDD = 1.0V VDD = 1.5V 1.2 1.5 0 0.5 1 1.5 2 2.5 3 3.5 VDS (V) VDS (V) Nch Driver Output Current vs. VDS 120 100 Output Voltage vs. Input Voltage 7 6 RT9818A-45 RT9818 Output Current (mA) Output Volgate (V) 5 4 3 80 60 40 20 0 0 1 2 3 4 5 VDD = 4.4V = 4.0V = 3.5V = 3.0V = 2.5V = 2.0V = 1.5V 4.5V 2 1 0 0 1 2 3 4 5 6 1.2V VDS (V) Input Volgate (V) Supply Current vs. Input Voltage 6 5 Supply Current vs. Input Voltage 4 RT9818A-12 80°C RT9818C-30 80°C 3.5 Supply Current (uA) Supply Current (uA) 3 2.5 2 1.5 1 0.5 0 4 25°C 3 2 1 0 0 1 2 3 4 5 6 25°C -30°C -30°C 0 1 2 3 4 5 6 Input Voltage (V) Input Voltage (V) DS9818-05 March 2007 www.richtek.com 5 RT9818 Supply Current vs. Input Voltage 4 3.5 Power-Down Reset Delay vs. Temperature 14 RT9818A-45 RT9818A-12 Power-Down Reset Delay (us) 80°C 25°C -30°C 12 10 8 6 4 2 0 Supply Current (uA) 3 2.5 2 1.5 1 0.5 0 0 1 2 3 4 VDROP = 200mV VDROP = 150mV VDROP = 250mV 5 6 -50 -25 0 25 50 75 100 125 Input Voltage (V) Temperature (°C) Power-Down Reset Delay vs. Temperature 45 Power-Down Reset Delay vs. Temperature 45 RT9818C-30 RT9818A-45 Power-Down Reset Delay (us) 35 30 25 20 15 10 5 0 -50 -25 0 25 50 75 100 125 Power-Down Reset Delay (us) 40 40 35 30 25 20 15 VDROP = 200mV VDROP = 150mV VDROP = 200mV VDROP = 150mV VDROP = 250mV VDROP = 250mV 10 5 0 -50 -25 0 25 50 75 100 125 Temperature (°C) Temperature (°C) Reset Threshold Deviation vs. Temperature 6 Nch Driver Sink Current vs. Input Voltage 40 RT9818 5.0V RT9818C-30, VDS = 0.5V -30°C 25°C 35 Reset Threshold (V) 4.5V 4.2V Sink Current ISINK (mA) 5 30 25 20 15 10 5 0 4 80°C 3 2.2V 2 1.2V 1 -50 -25 0 25 50 75 100 125 0 0.5 1 1.5 2 2.5 3 3.5 Temperature (°C) Input Voltage(V) www.richtek.com 6 DS9818-05 March 2007 RT9818 Nch Driver Sink Current vs. Input Voltage 50 Power-Up Reset Time-Out vs. Temperature 500 -30°C Sink Current ISINK (mA) 40 Power-Up Reset Time-Out (ms) RT9818A-45, VDS = 0.5V RT9818C 400 25°C VTH = 2.9V 300 30 80°C 20 200 VTH = 3.0V 10 100 0 0 1 2 3 4 5 0 -50 -25 0 25 50 75 100 125 Input Voltage(V) Temperature (°C) Power-Up Reset Time-Out vs. Temperature 100 Output Delay Time vs. Load Capacitance 1000 RT9818A RT9818 Power-Up Reset Time-Out (us) Output Delay Time (ms) 80 100 60 10 VTH = 5.0V 40 1 VTH = 1.2V VTH = 4.5V 20 0.1 VTH = 4.5V 0 -50 -25 0 25 50 75 100 125 0.01 0.0001 0.0010 0.0100 0.1000 1.0000 Temperature (°C) Load Capacitance (uF) Nch Driver Output Current vs. VDS 160 Nch Driver Output Current vs. Input Voltage 60 Nch Driver Output Current (mA)1 Nch Driver Output Current (mA)1 RT9818G-31 140 120 100 80 60 40 20 0 0 1 2 3 4 5 6 RT9818G-31 VDS = 0.5V 50 40 30 20 10 0 0 1 2 3 4 -30°C 25°C VDD = 6.0V = 5.5V = 5.0V = 4.5V = 4.0V = 3.5V 80°C 5 6 VDS (V) Input Voltage (V) DS9818-05 March 2007 www.richtek.com 7 RT9818 Power Down Reset Time-Out vs. Temperature Power Down Reset Time-Out (ms) 500 Output Voltage vs. Input Voltage 7 RT9818G-31 6 400 RT9818G-31 Output Voltage (V) -50 -25 0 25 50 75 100 125 5 4 3 2 1 300 200 100 0 0 0 1 2 3 4 5 6 Temperature (°C) Input Voltage (V) Power-Down Reset Time-Out vs. Temperature Power-Down Reset Time-Out (us) 30 25 20 RT9818G-31 VDROP = 200mV 15 10 5 0 -50 -25 0 25 50 75 100 125 VDROP = 150mV VDROP = 250mV Temperature (°C) www.richtek.com 8 DS9818-05 March 2007 RT9818 Application Information Multiple Supplies Mainly, the pull-up connected to the RT9818 will connect to the supply voltage that is being monitored at the IC’ s VDD pin. However, some systems may use the open-drain output to level-shift from the monitored supply to reset circuitry powered by some other supply. Benefits of Highly Accurate Reset Threshold Most μP supervisor ICs have reset threshold voltages between 1% and 1.5% below the value of nominal supply voltages. This ensures a reset will not occur within 1% of the nominal supply, but will occur when the supply is 1.5% below nominal. DS9818-05 March 2007 www.richtek.com 9 RT9818 Outline Dimension H L C B D e A A1 b Symbol A A1 B b C D e H L Dimensions In Millimeters Min 0.800 0.000 1.150 0.150 1.800 1.800 1.300 0.080 0.210 0.260 0.460 Max 1.100 0.100 1.350 0.400 2.450 2.250 Dimensions In Inches Min 0.031 0.000 0.045 0.006 0.071 0.071 0.051 0.003 0.008 0.010 0.018 Max 0.044 0.004 0.054 0.016 0.096 0.089 SC-70-3 Surface Mount Package www.richtek.com 10 DS9818-05 March 2007 RT9818 D e H L C B b b1 A e A1 Symbol A A1 B b b1 C D e H L Dimensions In Millimeters Min 0.800 0.000 1.150 0.150 0.350 1.800 1.800 1.300 0.080 0.200 0.260 0.460 Max 1.100 0.100 1.350 0.400 0.500 2.450 2.200 Dimensions In Inches Min 0.031 0.000 0.045 0.006 0.014 0.071 0.071 0.051 0.003 0.008 0.010 0.018 Max 0.043 0.004 0.053 0.016 0.020 0.096 0.087 SC-82 Surface Mount Package DS9818-05 March 2007 www.richtek.com 11 RT9818 D H L C B e A A1 b 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 1.803 0.080 0.300 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 0.000 0.055 0.014 0.102 0.106 0.071 0.003 0.012 Max 0.051 0.006 0.071 0.020 0.118 0.122 0.079 0.010 0.024 SOT-23-3 Surface Mount Package www.richtek.com 12 DS9818-05 March 2007 RT9818 H D L C B b A A1 e 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 0.080 0.300 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 0.003 0.012 Max 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024 SOT-23-5 Surface Mount Package DS9818-05 March 2007 www.richtek.com 13 RT9818 D D1 A C B C1 e e H A b b b1 Symbol A b B b1 C C1 D D1 e H Dimensions In Millimeters Min 1.397 0.356 2.388 0.406 3.937 0.787 4.394 1.397 1.448 0.356 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 0.155 0.031 0.173 0.055 0.057 0.014 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 Package Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Richtek Technology Corporation Taipei Office (Marketing) 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com www.richtek.com 14 DS9818-05 March 2007