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 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) 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 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) Lead Plating System P : Pb Free G : Green (Halogen Free and Pb Free) Threshold Voltage 12 : 1.2V 13 : 1.3V : 49 : 4.9V 50 : 5.0V Note : z 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. Typical Application Circuit 100k Pull Up RT9818 GND VDD VDD μP RESET/ RESET RESET/ RESET Richtek 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. DS9818-09 April 2011 www.richtek.com 1 RT9818 Pin Configurations (TOP VIEW) GND NC 4 3 VDD RESET/ RESET NC 4 3 3 2 RESET/ RESET 2 2 VDD VDD SC-82 GND GND SC-82 (R-Type) SC-70-3 VDD VDD NC NC 3 3 5 4 2 RESET/ RESET GND SOT-23-3 2 2 GND RESET/ RESET 1 3 RESET/ VDD GND RESET RESET/ RESET SOT-23-3 (L-Type) 2 RESET/ VDD RESET SOT-23-5 3 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 Threshold Voltage Setting CMP Timer N MOS GND POR Power On Reset Timing Diagram VDD VTH 0V VRESET Delay Time (0, 55, 220, 450ms) 0V VRESET Delay Time (0, 55, 220, 450ms) 0V www.richtek.com 2 DS9818-09 April 2011 RT9818 Absolute Maximum Ratings (Note 1) Terminal Voltage (with Respect to GND) VDD --------------------------------------------------------------------------------------------------------------------z All Other Inputs ----------------------------------------------------------------------------------------------------z Input Current, IVDD -------------------------------------------------------------------------------------------------z Power Dissipation, PD @ TA = 25°C SC-70 / SC-82 ------------------------------------------------------------------------------------------------------SOT-23-3 ------------------------------------------------------------------------------------------------------------SOT-23-5 ------------------------------------------------------------------------------------------------------------SOT-89 ---------------------------------------------------------------------------------------------------------------z Package Thermal Resistance (Note 2) SC-70 / SC-82, θJA ------------------------------------------------------------------------------------------------SOT-23-3, θJA -------------------------------------------------------------------------------------------------------SOT-23-5, θJA -------------------------------------------------------------------------------------------------------SOT-89, θJA ---------------------------------------------------------------------------------------------------------z Lead Temperature (Soldering, 10sec.) ------------------------------------------------------------------------z Storage Temperature Range ------------------------------------------------------------------------------------z ESD Susceptibility (Note 3) HBM (Human Body Mode) --------------------------------------------------------------------------------------MM (Machine Mode) ----------------------------------------------------------------------------------------------z Recommended Operating Conditions z z −0.3V to 6V −0.3V to (VDD + 0.3V) 20mA 0.25W 0.4W 0.4W 0.55W 400°C/W 250°C/W 250°C/W 180°C/W 260°C −65°C to 125°C 2kV 200V (Note 4) 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 Unit -3 1.2 to 5 6 8 -- V μA V % μs Operating VDD (VOUT) Range Supply Current Reset Threshold VDD IDD VTH VTH = 3V, VDD = 4.5V, T A = 27°C TA = 27°C 0.9 --- Threshold Voltage Accuracy V DD Drop to Reset Delay ΔV TH tRD TA = 27°C Drop = V TH −125mV −1.5 -- -20 1.5 -- -- 0 -- 35 55 75 143 220 297 292 450 608 -- -- 0.4 RT9818A/E Reset Active Time Out Period RT9818B/F RT9818C/G tRP RT9818D/H RESET Output Voltage Low VOL (Note 5) Hysteresis Width DS9818-09 April 2011 VHYS VDD ≥ 1.02 x V TH 3 = VDD < V TH ISINK > 3.5mA -- 0.01V TH 0.016V 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. 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 3. Devices are ESD sensitive. Handling precaution is recommended. Note 4. The device is not guaranteed to function outside its operating conditions. 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 DS9818-09 April 2011 RT9818 Typical Operating Characteristics Nch Driver Output Current vs. VDS Nch Driver Output Current vs. VDS 2.4 RT9818A-12 VDD = 1.1V 1.6 1.2 VDD = 1V 0.8 RT9818C-30 VDD = 2.8V 50 Output Current (mA) 2.0 Output Current (mA) 60 VDD = 2.5V 40 30 VDD = 2V 20 VDD = 1.5V 10 0.4 0 0.0 0 0.3 0.6 0.9 1.2 0 1.5 0.5 1 1.5 Nch Driver Output Current vs. VDS 3 3.5 Output Voltage vs. Input Voltage 120 7 RT9818 RT9818A-45 6 Output Voltage (V) 100 Output Current (mA) 2.5 VDS (V) VDS (V) 80 60 VDD = 4.4V = 4V = 3.5V = 3V = 2.5V = 2V = 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) RT9818A-12 4 5 6 RT9818C-30 3.5 Supply Current (μA) 80°C 4 25°C 3 2 3 Supply Current vs. Input Voltage 4.0 5 2 Input Voltage (V) Supply Current vs. Input Voltage 6 Supply Current (μA) 2 −30°C 1 80°C 3.0 2.5 25°C 2.0 −30°C 1.5 1.0 0.5 0.0 0 0 1 2 3 4 Input Voltage (V) DS9818-09 April 2011 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 4.0 14 Power Down Reset Delay (µs) RT9818A-45 3.5 Supply Current (μA) 80°C 3.0 25°C 2.5 -30°C 2.0 1.5 1.0 0.5 0.0 RT9818A-12 12 10 8 VDROP = 200mV 6 VDROP = 250mV 4 2 0 0 1 2 3 4 5 6 -50 -25 0 Input Voltage (V) Power Down Reset Delay (µs) 1 Power Down Reset Delay (µs) RT9818C-30 35 30 VDROP = 200mV 20 VDROP = 150mV 15 VDROP = 250mV 10 5 0 100 125 RT9818A-45 40 35 30 25 VDROP = 200mV VDROP = 150mV 20 15 VDROP = 250mV 10 5 -25 0 25 50 75 100 -50 125 -25 0 Reset Threshold Deviation vs. Temperature RT9818 5V 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) Temperature (°C) Reset Threshold (V) 75 0 -50 6 50 Power Down Reset Delay vs. Temperature 45 40 25 25 Temperature (°C) Power Down Reset Delay vs. Temperature 45 VDROP = 150mV 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 Temperature (°C) www.richtek.com 6 75 100 125 0 0.5 1 1.5 2 2.5 3 3.5 Input Voltage (V) DS9818-09 April 2011 RT9818 Power Up Reset Time-Out vs. Temperature Nch Driver Sink Current vs. Input Voltage 50 500 Power Up Reset Time-Out (ms) RT9818A-45, VDS = 0.5V Sink Current ISINK (mA) −30°C 40 25°C 30 80°C 20 10 RT9818C 400 VTH = 2.9V 300 200 VTH = 3V 100 0 0 0 1 2 3 4 -50 5 -25 0 Power Up Reset Time-Out vs. Temperature RT9818A 80 60 VTH = 5V 40 VTH = 4.5V 20 75 100 125 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 0.1000 1.0000 Nch Driver Output Current vs. Input Voltage Nch Driver Output Current vs. VDS 160 0.0100 Load Capacitance (µF) Temperature (°C) 60 RT9818G-31 Nch Driver Output Current (mA)1 Nch Driver Output Current (mA)1 50 Output Delay Time vs. Load Capacitance 1000 Output Delay Time (ms) Power Up Reset Time-Out (µs) 100 25 Temperature (°C) Input Voltage (V) 140 120 100 VDD = 6V = 5.5V = 5V = 4.5V = 4V = 3.5V 80 60 40 20 50 RT9818G-31 VDS = 0.5V −30°C 25°C 40 80°C 30 20 10 0 0 0 1 2 3 VDS (V) DS9818-09 April 2011 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 0 1 2 5 6 Threshold Voltage vs. Temperature Power Down Reset Time-Out vs. Temperature 4.40 RT9818G-31 RT9818A-42 4.35 25 Threshold Voltage (V) 1 Power Down Reset Time-Out (µs) 4 Input Voltage (V) Temperature (°C) 30 3 20 VDROP = 200mV VDROP = 150mV 15 10 VDROP = 250mV 5 4.30 Rising 4.25 4.20 Falling 4.15 4.10 4.05 0 4.00 -50 -25 0 25 50 75 100 125 Temperature (°C) -50 -25 0 25 50 75 100 125 Temperature (°C) Threshold Voltage vs. Temperature 2.40 RT9818C-22 Threshold Voltage (V) 1 2.35 2.30 2.25 Rising 2.20 Falling 2.15 2.10 2.05 2.00 -50 -25 0 25 50 75 100 125 Temperature (°C) www.richtek.com 8 DS9818-09 April 2011 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. DS9818-09 April 2011 www.richtek.com 9 RT9818 Outline Dimension H D L C B e A A1 b Dimensions In Millimeters Dimensions In Inches Symbol 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 DS9818-09 April 2011 RT9818 D e H L B C b1 b A A1 e Dimensions In Millimeters Dimensions In Inches Symbol 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 DS9818-09 April 2011 www.richtek.com 11 RT9818 H D L C B e A A1 b Dimensions In Millimeters Dimensions In Inches Symbol 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 DS9818-09 April 2011 RT9818 H D L B C b A A1 e Dimensions In Millimeters Dimensions In Inches Symbol 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 DS9818-09 April 2011 www.richtek.com 13 RT9818 D D1 A B C C1 e e H A b b1 b Dimensions In Millimeters Dimensions In Inches Symbol 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 5F, No. 95, Minchiuan Road, Hsintien City Hsinchu, Taiwan, R.O.C. Taipei County, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Tel: (8862)86672399 Fax: (8862)86672377 Email: [email protected] Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek. www.richtek.com 14 DS9818-09 April 2011