® RT9833 Micro-Power Voltage Detectors with Manual Reset General Description Features The RT9833 is a micro-power voltage detector with deglitched manual reset input 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 1V to 5V, which covers most digital applications. It features low supply current of 3μA. The RT9833 performs supervisory function by sending out a reset signal whenever the VDD voltage falls below a preset z 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. To pull reset signal low manually, just pull the manual reset input (MR) below the specified VIL level. The RT9833 is available in the SC-82 package. z z z z z z z z z z Internally Fixed Threshold 1V 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 : 0ms, 55ms, 220ms, 450ms Options 800ns Glitch Immunity of Manual Reset Input Low Functional Supply Voltage 0.9V N-Channel Open-Drain Output Small SC-82 Package RoHS Compliant and Halogen Free Applications z Ordering Information z RT9833 - z Package Type Y : SC-82 z Lead Plating System G : Green (Halogen Free and Pb Free) 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) 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. Note : 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. Simplified Application Circuit VDD µp RESET/ RESET Copyright © 2013 Richtek Technology Corporation. All rights reserved. DS9833-00 May 2013 RT9833 VDD MR RESET/ GND RESET is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT9833 Pin Configurations (TOP VIEW) VDD MR 4 3 2 GND RESET/ RESET SC-82 Functional Pin Description Pin No. 1 Pin Name Pin Function GND Ground. RESET Active Low Open Drain Reset Output. RESET Active High Open Drain Reset Output. 3 MR Manual Reset. 4 VDD Power. 2 Function Block Diagram MR VDD RESET/ RESET VSET Threshold Voltage Setting CMP Timer N MOS GND POR Power On Reset Operation When VDD is lower than threshold voltage set by VSET circuit, the RESET output becomes high. If VDD remains higher than the threshold voltage with a hysteresis voltage, Timer will be active. After a specific delay time, the RESET output becomes low. There is an internal pull-high resistor connected to the MR pin. MR resets the RT9833 only when it is pulled low. When MR releases and waits for a delay time, output returns to its normal state related to VDD. It is an open drain output type of Reset IC. VSET The VSET generates a fixed threshold voltage. CMP Voltage Comparator which compares the voltage difference between threshold voltage and VDD. POR Power on reset. It will set all digital logic to the right state when power on. Timer The Timer provides four kinds of delay time options including 0ms, 55ms, 220ms, and 450ms. Copyright © 2013 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS9833-00 May 2013 RT9833 Absolute Maximum Ratings z z z z z z z z (Note 1) Terminal Voltage (with Respect to GND) VDD ------------------------------------------------------------------------------------------------------------------- −0.3V to 6V All Other Inputs ---------------------------------------------------------------------------------------------------- −0.3V to (VDD + 0 .3V) Input Current, IVDD ------------------------------------------------------------------------------------------------- 20mA Power Dissipation, PD @ TA = 25°C SC-82 ---------------------------------------------------------------------------------------------------------------- 0.29W Package Thermal Resistance (Note 2) SC-82, θJA ----------------------------------------------------------------------------------------------------------- 345.6°C/W Lead Temperature (Soldering, 10sec.) ------------------------------------------------------------------------ 260°C Storage Temperature Range ------------------------------------------------------------------------------------ −65°C to 125°C ESD Susceptibility (Note 3) HBM (Human Body Model) -------------------------------------------------------------------------------------- 2kV Recommended Operating Conditions z z (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 0.9 -- 6 V Operating VDD (VOUT) 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 -- V VIL TA = 27°C, VTH > 1.2V -- -- 0.25VDD VIH TA = 27°C, VTH > 1.2V 0.7V DD -- -- -- 800 -- ns −1.5 -- 1.5 % -- 20 -- μs -- 0 -- 35 55 75 143 220 297 292 0.75 x VDD 450 608 -- VDD -- -- -- 0 0.25 x VDD -- 35 55 75 143 220 297 292 450 608 -- -- 0.4 V -- 0.01VTH -- V MR Input Threshold MR Glitch Rejection Threshold Voltage Accuracy ΔVTH TA = 27°C VDD Drop to Reset Delay tRD Drop = VTH −125mV RT9833A/E MR Active Timeout Period RT9833B/F RT9833C/G tMR RT9833D/H MR Input Voltage Logic-High Threshold Logic-Low VMR_H VDD > VTH(MAX) VMR_L VDD > VTH(MAX) RT9833A/E Reset Active Time Out Period RT9833B/F RT9833C/G tRP VDD ≥ 1.02×VTH RT9833D/H RESET Output Voltage Low VOL Hysteresis Width VHYS 3 = VDD < VTH ISINK > 3.5mA Copyright © 2013 Richtek Technology Corporation. All rights reserved. DS9833-00 May 2013 V ms V ms is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RT9833 Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and 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 may affect device reliability. Note 2. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. Note 3. Devices are ESD sensitive. Handling precaution is recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Copyright © 2013 Richtek Technology Corporation. All rights reserved. www.richtek.com 4 is a registered trademark of Richtek Technology Corporation. DS9833-00 May 2013 RT9833 Typical Application Circuit VDD µp 100k Pull Up RESET/ RESET Copyright © 2013 Richtek Technology Corporation. All rights reserved. DS9833-00 May 2013 RT9833 4 VDD MR 3 1 2 RESET/ GND RESET is a registered trademark of Richtek Technology Corporation. www.richtek.com 5 RT9833 Typical Operating Characteristics RESET Sink Current vs. VDS 2.4 RT9833A-12 VDD = 1.1V 1.6 1.2 VDD = 1V 0.8 RT9833C-30 VDD = 2.8V 50 Sink Current (mA) 2.0 Sink Current (mA) RESET Sink Output Current vs. VDS 60 VDD = 2.5V 40 30 VDD = 2V 20 0.4 VDD = 1.5V 10 0 0.0 0 0.3 0.6 0.9 1.2 0 1.5 0.5 1 1.5 RESET Sink Current vs. VDS RT9833A-45 3.5 RT9833 6 Output Voltage (V) Sink Current (mA) 3 Output Voltage vs. Input Voltage 7 100 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) RT9833A-12 4 5 6 RT9833C-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) 2.5 VDS (V) VDS (V) 120 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 5 Input Voltage (V) Copyright © 2013 Richtek Technology Corporation. All rights reserved. www.richtek.com 6 6 0 1 2 3 4 5 6 Input Voltage (V) is a registered trademark of Richtek Technology Corporation. DS9833-00 May 2013 RT9833 Power Down Reset Delay vs. Temperature Supply Current vs. Input Voltage 4.0 14 Supply Current (μA) Power Down Reset Delay (µs) RT9833A-45 3.5 80°C 3.0 25°C 2.5 −30°C 2.0 1.5 1.0 0.5 0.0 RT9833A-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 (µs) 1 Power Down Reset Delay (µs) RT9833C-30 35 30 VDROP = 200mV 20 VDROP = 150mV 15 VDROP = 250mV 10 5 -50 125 RT9833A-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 RT9833 5V 35 4.5V 30 Sink Current (mA) 4 50 75 100 125 RESET Sink Current vs. Input Voltage 40 5 25 Temperature (°C) Temperature (°C) Reset Threshold (V) 100 0 0 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 RT9833C-30, VDS = 0.5V −30°C 25°C 25 20 80°C 15 10 5 1.2V 1 0 -50 -25 0 25 50 75 100 Temperature (°C) Copyright © 2013 Richtek Technology Corporation. All rights reserved. DS9833-00 May 2013 125 0 0.5 1 1.5 2 2.5 3 3.5 Input Voltage (V) is a registered trademark of Richtek Technology Corporation. www.richtek.com 7 RT9833 Power Up Reset Timeout vs. Temperature RESET Sink Current vs. Input Voltage 50 500 Power Up Reset Timeout (ms) RT9833A-45, VDS = 0.5V −30°C Sink Current (mA) 40 25°C 30 80°C 20 10 RT9833C 400 VTH = 2.9V 300 200 VTH = 3V 100 0 0 0 1 2 3 4 -50 5 -25 0 Power Up Reset Timeout vs. Temperature 100 125 Output Delay Time vs. Load Capacitance RT9833A Output Delay Time (ms) Power Up Reset Timeout (µs) 75 1000 80 60 VTH = 5V 40 VTH = 4.5V 20 100 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 RESET Sink Current vs. VDS 160 0.0100 0.1000 1.0000 Load Capacitance (µF) Temperature (°C) RESET Sink Current vs. Input Voltage 60 RT9833G-31 140 50 120 100 Sink Current (mA) 1 Sink Current (mA) 1 50 Temperature (°C) Input Voltage (V) 100 25 VDD = 6V = 5.5V = 5V = 4.5V = 4.V = 3.5V 80 60 40 RT9833G-31 VDS = 0.5V −30°C 25°C 40 80°C 30 20 10 20 0 0 0 1 2 3 4 5 VDS (V) Copyright © 2013 Richtek Technology Corporation. All rights reserved. www.richtek.com 8 6 0 1 2 3 4 5 6 Input Voltage (V) is a registered trademark of Richtek Technology Corporation. DS9833-00 May 2013 RT9833 Power Up Reset Timeout vs. Temperature Output Voltage vs. Input Voltage 7 RT9833G-31 RT9833G-31 6 400 Output Voltage (V) Power Up Reset Timeout (ms) 500 300 200 100 5 4 3 2 1 0 0 -50 -25 0 25 50 75 100 125 0 1 2 3 4 5 6 Input Voltage (V) Temperature (°C) Power Down Reset Delay vs. Temperature Power Down Reset Delay (µs) 30 RT9833G-31 25 20 VDROP = 200mV VDROP = 150mV 15 10 VDROP = 250mV 5 0 -50 -25 0 25 50 75 100 125 Temperature (°C) Copyright © 2013 Richtek Technology Corporation. All rights reserved. DS9833-00 May 2013 is a registered trademark of Richtek Technology Corporation. www.richtek.com 9 RT9833 Application Information Mainly, the pull-up connected to the RT9833 will connect to the supply voltage that is being monitored at the IC's VCC pin. However, some systems may use the opendrain 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. 0.5 Maximum Power Dissipation (W)1 Multiple Supplies Four-Layer PCB 0.4 0.3 0.2 0.1 0.0 0 25 50 75 100 125 Ambient Temperature (°C) Figure 1. Derating Curve of Maximum Power Dissipation Thermal Considerations For continuous operation, do not exceed absolute maximum junction temperature. The maximum power dissipation depends on the thermal resistance of the IC package, PCB layout, rate of surrounding airflow, and difference between junction and ambient temperature. The maximum power dissipation can be calculated by the following formula : PD(MAX) = (TJ(MAX) − TA) / θJA where TJ(MAX) is the maximum junction temperature, TA is the ambient temperature, and θJA is the junction to ambient thermal resistance. For recommended operating condition specifications, the maximum junction temperature is 125°C. The junction to ambient thermal resistance, θJA, is layout dependent. SC-82 package, the thermal resistance, θJA, is 345.6°C/ W on a standard JEDEC 51-7 four-layer thermal test board. The maximum power dissipation at TA = 25°C can be calculated by the following formula : PD(MAX) = (125°C − 25°C) / (345.6°C/W) = 0.29W for SC-82 package The maximum power dissipation depends on the operating ambient temperature for fixed T J(MAX) and thermal resistance, θJA. The derating curve in Figure 1 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation. Copyright © 2013 Richtek Technology Corporation. All rights reserved. www.richtek.com 10 is a registered trademark of Richtek Technology Corporation. DS9833-00 May 2013 RT9833 Outline Dimension 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 Richtek Technology Corporation 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries. DS9833-00 May 2013 www.richtek.com 11