® RT9834 Micro-Power Voltage Detector with Manual Reset General Description Features The RT9834 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 1.2V to 5V, which covers most digital applications. It features low supply current of 3μA. The RT9834 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 RT9834 is available in the SC-82 and SOT-143 packages. z z z z z z z z z z z z For marking information, contact our sales representative directly or through a Richtek distributor located in your area. 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 CMOS Push-Pull Output Small SC-82 and SOT-143 Packages RoHS Compliant and Halogen Free Applications z Marking Information Internally Fixed Threshold 1.2V to 5V in 0.1V Step High Accuracy ±1.5% Low Supply Current 3μ μA z z Computers Controllers Intelligent Instruments Critical μP and μC Power Monitoring Portable/Battery-Powered Equipment Simplified Application Circuit VDD RT9834 VDD MR µp RESET/ RESET Copyright © 2013 Richtek Technology Corporation. All rights reserved. DS9834-00 May 2013 RESET/ GND RESET is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT9834 Ordering Information RT9834 Pin Configurations (TOP VIEW) Package Type H : SOT-143 Y : SC-82 VDD MR 4 3 2 Lead Plating System G : Green (Halogen Free and Pb Free) GND Threshold Voltage 12 : 1.2V 13 : 1.3V : 49 : 4.9V 50 : 5.0V RESET/ RESET SOT-143 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) VDD MR 4 3 2 GND RESET/ RESET SC-82 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. Functional Pin Description Pin No. 1 Pin Name Pin Function GND Ground. RESET Active Low Push-Pull Reset Output. RESET Active High Push-Pull Reset Output. 3 MR Manual Reset. 4 VDD Power. 2 Copyright © 2013 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS9834-00 May 2013 RT9834 Function Block Diagram VDD VDD MR P MOS VSET CMP RESET/ RESET Timer N MOS Threshold Voltage Setting 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 RT9834 only when it is pulled low. When MR releases and waits for a delay time, output returns to its normal state related to VDD. The RESET pin is a Pull-Push output, and it will pull the output high to VDD, low to Ground. Adding a pullhigh resistor tied to any power which higher than VDD is forbidden. Timer The Timer provides four kinds of delay time options including 0ms, 55ms, 220ms, and 450ms. 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. Copyright © 2013 Richtek Technology Corporation. All rights reserved. DS9834-00 May 2013 is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RT9834 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 SOT-143 -------------------------------------------------------------------------------------------------------------- 0.44W SC-82 ----------------------------------------------------------------------------------------------------------------- 0.29W Package Thermal Resistance (Note 2) SOT-143, θJA --------------------------------------------------------------------------------------------------------- 228.1°C/W 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, TA = 25°C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit RT9834A/B/C/D 0.9 -- 6 RT9834E/F/G/H 1.1 -- 6 -- 3 8 μA -- 1.2 to 5 -- V Operating VDD (VOUT) Range VDD Supply Current IDD Reset Threshold VTH Threshold Voltage Accuracy ΔVTH −1.5 -- 1.5 % Threshold Voltage Hysteresis VHYS -- 0.01 VTH -- V VDD Drop to Reset Delay tRD -- 20 -- μs -- 0 -- 35 55 75 143 220 297 292 450 608 -- -- 0.4 -- -- 0.3 -- -- 0.3 VTH = 3V, VDD = 4.5V Drop = VTH −125mV RT9834A/E Reset Active Timeout Period RT9834B/F RT9834C/G tRP VDD ≥ 1.02 x VTH RT9834D/H VDD < VTH(MIN) ,ISINK = 3.5mA, VTH ≥ 3V RESET Output Voltage Low VOL VDD < VTH(MIN) ,ISINK = 1.2mA, VTH ≥ 1.8V VTH(MIN) > VDD > 1V, ISINK = 0.5mA Copyright © 2013 Richtek Technology Corporation. All rights reserved. www.richtek.com 4 V ms V is a registered trademark of Richtek Technology Corporation. DS9834-00 May 2013 RT9834 Parameter Symbol Test Conditions Min Typ Max VDD − 1.5 -- -- 0.8 VDD -- -- 0.8 VDD -- -- -- -- 0.4 -- -- 0.3 -- -- 0.3 0.8 VDD -- -- 0.8 VDD -- -- VDD − 1.5 -- -- -- 0 -- 35 55 75 RT9834C/G 143 220 297 RT9834D/H 292 450 608 V DD > VTH(MAX), ISOURCE = 800μA, VTH ≥ 3V RESET Output Voltage High RESET Output Voltage Low RESET Output Voltage High V OH V OL V OH V DD > VTH(MAX), ISOURCE = 500μA, VTH ≥ 1.8V V DD > VTH(MAX), ISOURCE = 200μA, VTH ≥ 1.1V V DD > VTH(MAX), ISINK = 3.5mA, V TH ≥ 3V V DD > VTH(MAX), ISINK = 1.2mA, V TH ≥ 1.8V V DD > VTH(MAX), ISINK = 0.5mA, V TH ≥ 1.2V 1.1V < V DD < VTH(MIN), ISOURCE = 200μA 1.8V < V DD < VTH(MIN), ISOURCE = 500μA 3V < VDD < VTH(MIN), ISOURCE = 800μA RT9834A/E MR Active Timeout Period RT9834B/F MR Input Voltage Logic-High Threshold Logic-Low tMR V MR_H V DD > VTH(MAX) 0.75 x V DD -- V DD V MR_L V DD > VTH(MAX) -- -- 0.25 x V DD Unit V V V ms V 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. DS9834-00 May 2013 is a registered trademark of Richtek Technology Corporation. www.richtek.com 5 RT9834 Typical Application Circuit VDD RT9834 4 VDD MR 3 µp RESET/ RESET Copyright © 2013 Richtek Technology Corporation. All rights reserved. www.richtek.com 6 2 RESET/ 1 GND RESET is a registered trademark of Richtek Technology Corporation. DS9834-00 May 2013 RT9834 Typical Operating Characteristics Nch Driver Output Current vs. VDS Nch Driver Output Current vs. VDS 2.4 60 RT9834A-12 VDD = 1.1V VDD = 2.8V 50 Output Current (mA) Output Current (mA) 2.0 RT9834C-30 1.6 1.2 VDD = 1V 0.8 0.4 VDD = 2.5V 40 30 VDD = 2V 20 VDD = 1.5V 10 0.0 0 0 0.3 0.6 0.9 1.2 1.5 0 0.5 1 1.5 VDS (V) RT9834A-45 3.5 RT9834A 6 Output Voltage (V) Output Current (mA) 3 Output Voltage vs. Input Voltage 7 100 80 VDD = 4.4V = 4V = 3.5V = 3V = 2.5V = 2V = 1.5V 60 40 20 5 4 5V 3 2 3V 2.9V 1 0 0 0 1 2 3 4 5 0 1 VDS (V) 2 3 4 5 6 Input Voltage (V) Supply Current vs. Input Voltage Supply Current vs. Input Voltage 4 6 RT9834A-12 RT9834C-30 5 Supply Current IDD (µA) Supply Current (µA) 2.5 VDS (V) Nch Driver Output Current vs. VDS 120 2 80°C 4 25°C 3 2 −30°C 1 80°C 3 25°C 2 −30°C 1 0 0 0 1 2 3 4 5 Input Voltage (V) Copyright © 2013 Richtek Technology Corporation. All rights reserved. DS9834-00 May 2013 6 0 1 2 3 4 5 6 Input Voltage (V) is a registered trademark of Richtek Technology Corporation. www.richtek.com 7 RT9834 Supply Current vs. Input Voltage 4 Power-Down Reset Delay vs. Temperature 15 Power-Down Reset Delay (µs) RT9834A-45 Supply Current (µA) 80°C 3 25°C −30°C 2 1 RT9834A-12 12 9 VDROP = 200mV VDROP = 150mV 6 VDROP = 250mV 3 0 0 0 1 2 3 4 5 -50 6 -25 0 Power-Down Reset Delay vs. Temperature RT9834C-30 40 35 30 25 VDROP = 200mV 20 VDROP = 150mV 15 VDROP = 250mV 10 5 0 75 100 125 RT9834A-45 40 35 30 VDROP = 200mV 25 VDROP = 150mV 20 15 VDROP = 250mV 10 5 0 -50 -25 0 25 50 75 100 125 -50 -25 0 Temperature (°C) 50 75 100 125 Nch Driver Sink Current vs. Input Voltage Nch Driver Sink Current vs. Input Voltage 50 RT9834C-30, VDS = 0.5V RT9834A-45, VDS = 0.5V −30°C Sink Current I SINK (mA) −30°C 30 25°C 20 25 Temperature (°C) 40 Sink Current I SINK (mA) 50 Power-Down Reset Delay vs. Temperature 45 Power-Down Reset Delay (µs) Power-Down Reset Delay (µs) 45 25 Temperature (°C) Input Voltage (V) 80°C 10 40 25°C 30 80°C 20 10 0 0 0 0.5 1 1.5 2 2.5 3 Input Voltage (V) Copyright © 2013 Richtek Technology Corporation. All rights reserved. www.richtek.com 8 3.5 0 1 2 3 4 5 Input Voltage (V) is a registered trademark of Richtek Technology Corporation. DS9834-00 May 2013 RT9834 Reset Threshold Deviation vs. Temperature Pch Driver Output Current vs. Input Voltage 25 RT9834 RT9834C-30 VDS = 2.1V 5V 5 20 4.5V Output Current (mA) Reset Threshold Deviation (V) 6 4.2V 4 3 2.2V 2 VDS = 1.5V 15 VDS = 1V 10 VDS = 0.5V 5 1.2V 0 1 -50 -25 0 25 50 75 100 0 125 1 2 Temperature (°C) Power-Up Reset Timeout (ms) Power-Up Reset Timeout (ms) 400 VTH = 2.9V 300 VTH = 3V 100 0 6 RT9834A 75 VTH = 5V 50 VTH = 4.5V 25 0 -50 -25 0 25 50 75 100 125 -50 -25 Output Delay Time vs. Load Capacitance Nch Driver Output Current (mA) 160 100 10 VTH = 3V 1 VTH = 2.9V VTH = 5V 0.01 0.0001 25 50 75 100 125 Nch Driver Output Current vs. VDS 1000 0.1 0 Temperature (°C) Temperature (°C) Output Delay Time (ms) 5 Power-Up Reset Timeout vs. Temperature 100 RT9834C 200 4 Input Voltage (V) Power-Up Reset Timeout vs. Temperature 500 3 RT9834G-31 140 120 100 VDD = 6V = 5.5V = 5V = 4.5V = 4V = 3.5V 80 60 40 20 0 0.0010 0.0100 0.1000 Load Capacitance (µF) Copyright © 2013 Richtek Technology Corporation. All rights reserved. DS9834-00 May 2013 1.0000 0 1 2 3 4 5 6 VDS (V) is a registered trademark of Richtek Technology Corporation. www.richtek.com 9 RT9834 Power-Up Reset Timeout vs. Temperature Nch Driver Output Current vs. Input Voltage 500 RT9834G-31 VDS = 0.5V Power-Up Reset Timeout (ms) Nch Driver Output Current (mA)1 60 −30°C 50 25°C 40 80°C 30 20 10 RT9834G-31 400 300 200 100 0 0 0 1 2 3 4 5 -50 6 -25 0 75 100 125 Power-Down Reset Delay vs. Temperature Output Voltage vs. Input Voltage 30 Power-Down Reset Delay (µs) RT9834G-31 6 Output Voltage (V) 50 Temperature (°C) Input Voltage (V) 7 25 5 4 3 2 1 RT9834G-31 25 20 VDROP = 200mV VDROP = 150mV 15 10 VDROP = 250mV 5 0 0 0 1 2 3 4 5 Input Voltage (V) Copyright © 2013 Richtek Technology Corporation. All rights reserved. www.richtek.com 10 6 -50 -25 0 25 50 75 100 125 Temperature (°C) is a registered trademark of Richtek Technology Corporation. DS9834-00 May 2013 RT9834 Application Information 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. 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 : 0.6 Maximum Power Dissipation (W) Benefits of Highly Accurate Reset Threshold Four-Layer PCB 0.5 SOT-143 0.4 0.3 SC-82 0.2 0.1 0.0 0 25 50 75 100 125 Ambient Temperature (°C) Figure 1. Derating Curve of Maximum Power Dissipation 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. For SOT-143 package, the thermal resistance, θJA, is 228.1°C/ W on a standard JEDEC 51-7 four-layer thermal test board. 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) / (228.1°C/W) = 0.44W for SOT-143 package 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. DS9834-00 May 2013 is a registered trademark of Richtek Technology Corporation. www.richtek.com 11 RT9834 Outline Dimension D e H L B C b b1 A A1 e Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 0.800 1.200 0.031 0.047 A1 0.050 0.150 0.002 0.006 B 1.200 1.400 0.047 0.055 b 0.300 0.520 0.012 0.020 b1 0.760 0.920 0.030 0.036 C 2.100 2.640 0.083 0.104 D 2.800 3.040 0.110 0.120 e 1.900 0.075 H 0.080 0.150 0.003 0.006 L 0.210 0.410 0.008 0.016 SOT-143 Surface Mount Package Copyright © 2013 Richtek Technology Corporation. All rights reserved. www.richtek.com 12 is a registered trademark of Richtek Technology Corporation. DS9834-00 May 2013 RT9834 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. DS9834-00 May 2013 www.richtek.com 13