RT9818 Micro-Power Voltage Detectors General Description Features 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 z 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. z Ordering Information z RT9818 z z z z z z z z Applications z 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) Internally Fixed Threshold 1.2V to 5V in 0.1V Step High Accuracy ±1.5% Low Supply Current 3μ μA No External Components Required μs Quick Reset within 20μ 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 z z z Computers Controllers Intelligent Instruments Critical μP and μC Power Monitoring Portable/Battery-Powered Equipment 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 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) 100k Pull Up RT9818 GND VDD VDD μP RESET/ RESET 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) GND NC RESET/ RESET NC VDD 4 3 4 3 3 1 2 1 2 1 2 1 2 1 2 RESET/ RESET VDD VDD GND GND RESET/ RESET RESET/ RESET GND GND RESET/ RESET SC-82 (R-Type) SC-82 NC NC 5 4 1 3 2 RESET/ VDD GND RESET SOT-23-5 SC-70-3 VDD VDD 3 3 SOT-23-3 SOT-23-3 (L-Type) Note : There is no pin1 indicator on top mark for SC-82 type, 1 2 and pin 1 will be lower left pin when reading top mark from 3 left to right. Pin2 of SC-82 is wider than other pins. RESET/ VDD RESET GND SOT-89 Functional Pin Description Pin Name Pin Function GND Ground RESET Active Low Open-Drain Reset Output RESET Active High Open-Drain Reset Output VDD Power Pin Function Block Diagram VDD RESET/ RESET VSET CMP Timer N MOS GND Threshold Voltage Setting POR Power On Reset 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 z All Other Inputs -------------------------------------------------------------------------------------------------------- −0.3V to VDD+0.3V z Input Current, IVDD ----------------------------------------------------------------------------------------------------- 20mA z 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 z 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 z Lead Temperature (Soldering, 10sec.) ---------------------------------------------------------------------------- 260°C z Storage Temperature Range ---------------------------------------------------------------------------------------- −65°C to 125°C z ESD Susceptibility (Note 2) HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V z Recommended Operating Conditions z z (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 Symbol Test Conditions Min Typ Max Units 0.9 -- 6 V Operating VDD (V OUT ) Range VDD Supply Current IDD VTH = 3V , VDD = 4.5V TA = 27°C -- 3 8 μA Reset Threshold VTH TA = 27°C -- 1.2 to 5.0 -- V Threshold Voltage Accuracy ΔVTH TA = 27°C −1.5 -- +1.5 % V DD Drop to Reset Delay tRD Drop = V TH -125mV -- 20 -- μs -- 0 -- 35 55 75 143 220 297 292 450 608 -- -- 0.4 RT9818A/E Reset Active Time Out Period RT9818B/F RT9818C/G tRP VDD ≥ 1.02×VTH RT9818D/H RESET Output Voltage Low (Note 5) VOL Hysteresis Width DS9818-05 March 2007 VHYS 3 = VDD < V TH ISINK >3.5mA 0.01V TH ms V V 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 is 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 Nch Driver Output Current vs. VDS 60 RT9818A-12 VDD = 1.1V 2 1.6 1.2 VDD = 1.0V 0.8 RT9818C-30 VDD = 2.8V 50 Output Current (mA) Output Current (mA) 2.4 0.4 VDD = 2.5V 40 30 VDD = 2.0V 20 VDD = 1.5V 10 0 0 0 0.3 0.6 0.9 1.2 1.5 0 0.5 1 1.5 7 3.5 RT9818 RT9818A-45 6 Output Volgate (V) 100 Output Current (mA) 3 Output Voltage vs. Input Voltage Nch Driver Output Current vs. VDS 80 60 VDD = 4.4V = 4.0V = 3.5V = 3.0V = 2.5V = 2.0V = 1.5V 40 20 5 4 3 4.5V 2 1 0 1.2V 0 0 1 2 3 4 5 0 1 VDS (V) 2 3 4 5 6 Input Volgate (V) Supply Current vs. Input Voltage 6 Supply Current vs. Input Voltage 4 RT9818A-12 RT9818C-30 3.5 5 80°C Supply Current (uA) Supply Current (uA) 2.5 VDS (V) VDS (V) 120 2 4 25°C 3 2 -30°C 1 80°C 3 2.5 25°C 2 -30°C 1.5 1 0.5 0 0 0 1 2 3 4 Input Voltage (V) DS9818-05 March 2007 5 6 0 1 2 3 4 5 6 Input Voltage (V) www.richtek.com 5 RT9818 Power-Down Reset Delay vs. Temperature Supply Current vs. Input Voltage 4 14 Power-Down Reset Delay (us) RT9818A-45 3.5 Supply Current (uA) 80°C 3 25°C 2.5 -30°C 2 1.5 1 0.5 0 RT9818A-12 12 10 VDROP = 200mV 8 VDROP = 150mV 6 VDROP = 250mV 4 2 0 0 1 2 3 4 5 6 -50 -25 0 Input Voltage (V) Power-Down Reset Delay (us) Power-Down Reset Delay (us) RT9818C-30 35 30 VDROP = 200mV 20 VDROP = 150mV 15 VDROP = 250mV 10 5 0 125 RT9818A-45 40 35 30 25 VDROP = 200mV VDROP = 150mV 20 15 VDROP = 250mV 10 5 -25 0 25 50 75 100 125 -50 -25 0 Temperature (°C) RT9818 5.0V 75 100 125 RT9818C-30, VDS = 0.5V Sink Current ISINK (mA) 35 4.5V 4 50 Nch Driver Sink Current vs. Input Voltage 40 5 25 Temperature (°C) Reset Threshold Deviation vs. Temperature Reset Threshold (V) 100 0 -50 6 75 Power-Down Reset Delay vs. Temperature 45 40 25 50 Temperature (°C) Power-Down Reset Delay vs. Temperature 45 25 4.2V 3 2.2V 2 -30°C 30 25°C 25 20 80°C 15 10 5 1.2V 0 1 -50 -25 0 25 50 75 Temperature (°C) www.richtek.com 6 100 125 0 0.5 1 1.5 2 2.5 3 3.5 Input Voltage(V) DS9818-05 March 2007 RT9818 Power-Up Reset Time-Out vs. Temperature Nch Driver Sink Current vs. Input Voltage 50 500 -30°C Sink Current ISINK (mA) RT9818C Power-Up Reset Time-Out (ms) RT9818A-45, VDS = 0.5V 40 25°C 30 80°C 20 10 400 VTH = 2.9V 300 VTH = 3.0V 200 100 0 0 0 1 2 3 4 5 -50 -25 0 25 Input Voltage(V) 1000 Output Delay Time (ms) RT9818A Power-Up Reset Time-Out (us) 100 125 Output Delay Time vs. Load Capacitance Power-Up Reset Time-Out vs. Temperature 80 60 VTH = 5.0V VTH = 4.5V 20 RT9818 100 10 VTH = 1.2V 1 0.1 VTH = 4.5V 0 -50 -25 0 25 50 75 100 125 0.01 0.0001 0.0010 60 Nch Driver Output Current (mA)1 RT9818G-31 140 120 100 VDD = 6.0V = 5.5V = 5.0V = 4.5V = 4.0V = 3.5V 80 60 40 0.1000 1.0000 Nch Driver Output Current vs. Input Voltage Nch Driver Output Current vs. VDS 160 0.0100 Load Capacitance (uF) Temperature (°C) Nch Driver Output Current (mA)1 75 Temperature (°C) 100 40 50 20 RT9818G-31 VDS = 0.5V -30°C 50 25°C 40 80°C 30 20 10 0 0 0 1 2 3 VDS (V) DS9818-05 March 2007 4 5 6 0 1 2 3 4 5 6 Input Voltage (V) www.richtek.com 7 RT9818 Output Voltage vs. Input Voltage 7 RT9818G-31 RT9818G-31 6 400 Output Voltage (V) Power Down Reset Time-Out (ms) Power Down Reset Time-Out vs. Temperature 500 300 200 5 4 3 2 100 1 0 0 -50 -25 0 25 50 75 100 125 Temperature (°C) 0 1 2 3 4 5 6 Input Voltage (V) Power-Down Reset Time-Out (us) Power-Down Reset Time-Out vs. Temperature 30 RT9818G-31 25 20 VDROP = 200mV VDROP = 150mV 15 10 VDROP = 250mV 5 0 -50 -25 0 25 50 75 100 125 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 D L C B e A A1 b Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 0.800 1.100 0.031 0.044 A1 0.000 0.100 0.000 0.004 B 1.150 1.350 0.045 0.054 b 0.150 0.400 0.006 0.016 C 1.800 2.450 0.071 0.096 D 1.800 2.250 0.071 0.089 e 1.300 0.051 H 0.080 0.260 0.003 0.010 L 0.210 0.460 0.008 0.018 SC-70-3 Surface Mount Package www.richtek.com 10 DS9818-05 March 2007 RT9818 D e H L B C b1 b A A1 e Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 0.800 1.100 0.031 0.043 A1 0.000 0.100 0.000 0.004 B 1.150 1.350 0.045 0.053 b 0.150 0.400 0.006 0.016 b1 0.350 0.500 0.014 0.020 C 1.800 2.450 0.071 0.096 D 1.800 2.200 0.071 0.087 e 1.300 0.051 H 0.080 0.260 0.003 0.010 L 0.200 0.460 0.008 0.018 SC-82 Surface Mount Package DS9818-05 March 2007 www.richtek.com 11 RT9818 H D L C B e A A1 b Symbol 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 0.508 0.014 0.020 C 2.591 2.997 0.102 0.118 D 2.692 3.099 0.106 0.122 e 1.803 2.007 0.071 0.079 H 0.080 0.254 0.003 0.010 L 0.300 0.610 0.012 0.024 SOT-23-3 Surface Mount Package www.richtek.com 12 DS9818-05 March 2007 RT9818 H D L B C b A A1 e Symbol 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 0.080 0.254 0.003 0.010 L 0.300 0.610 0.012 0.024 SOT-23-5 Surface Mount Package DS9818-05 March 2007 www.richtek.com 13 RT9818 D D1 A B C C1 e e H A b Symbol b1 b Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 1.397 1.600 0.055 0.063 b 0.356 0.483 0.014 0.019 B 2.388 2.591 0.094 0.102 b1 0.406 0.533 0.016 0.021 C 3.937 4.242 0.155 0.167 C1 0.787 1.194 0.031 0.047 D 4.394 4.597 0.173 0.181 D1 1.397 1.753 0.055 0.069 e 1.448 1.549 0.057 0.061 H 0.356 0.432 0.014 0.017 3-Lead SOT-89 Surface Mount Package Richtek Technology Corporation Richtek Technology Corporation Headquarter Taipei Office (Marketing) 5F, No. 20, Taiyuen Street, Chupei City 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Hsinchu, Taiwan, R.O.C. Taipei County, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com www.richtek.com 14 DS9818-05 March 2007