RT9819 Micro-Power Voltage Detectors General Description Features The RT9819 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 RT9819 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 z threshold level, the reset signal will be released after a certain delay time. RT9819 is provided in SC-70-3, SC-82 and SOT-23-3 packages. z Ordering Information RT9819 Package Type U3 : SC-70-3 V : SOT-23-3 VL : SOT-23-3 (L-Type) 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) z z z z z z z z Internally Fixed Threshold 1.2V to 5V in 0.1V Step High Accuracy ±1.5% Low Supply Current 3μ μA No External Components Required Quick Reset within 20μ μs Built-in Recovery Delay Include 0ms, 55ms, 220ms, 450ms Options Low Functional Supply Voltage 0.9V CMOS Push-Pull Output Small SC-70-3, SC-82 and SOT-23-3 Packages RoHS Compliant and 100% Lead (Pb)-Free Applications z 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, otherwise visit our website for detail. Typical Application Circuit RT9819 VDD GND VDD up 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. DS9819-05 August 2007 www.richtek.com 1 RT9819 Pin Configurations (TOP VIEW) VDD GND NC RESET/ RESET NC 3 4 3 4 3 VDD VDD 3 3 1 2 1 2 1 2 1 2 1 2 GND RESET/ RESET RESET/ RESET VDD VDD GND GND RESET/ RESET RESET/ RESET GND SC-82 SC-70-3 SC-82 (R-Type) SOT-23-3 SOT-23-3 (L-Type) Note : There is no pin1 indicator on top mark for SC-82 type, 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. Functional Pin Description Pin Name Pin Function GND Ground RESET Active Low Push-Pull Reset Output RESET Active High Push-Pull Reset Output VDD Power Pin Function Block Diagram VDD VDD P MOS VSET CMP Timer RESET/ RESET N MOS Threshold Voltage Setting POR Power On Reset www.richtek.com 2 DS9819-05 August 2007 RT9819 Absolute Maximum Ratings z z z z z z z z (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-70-3/SC-82 --------------------------------------------------------------------------------------------------------- 0.25W SOT-23-3 ---------------------------------------------------------------------------------------------------------------- 0.4W Package Thermal Resistance (Note 4) SC-70-3/SC-82, θJA --------------------------------------------------------------------------------------------------- 400°C /W SOT-23-3, θJA ----------------------------------------------------------------------------------------------------------- 250°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 z z (Note 3) 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 Units RT9819A/B/C/D 0.9 -- 6 RT9819E/F/G/H 1.1 -- 6 -- 3 8 μA -- 1.2 to 5.0 -- V Operating V DD (VOUT) Range V DD Supply Current IDD Reset Threshold V TH Threshold Voltage Accuracy ΔVTH −1.5 -- +1.5 % Threshold Voltage Hysteresis V HYS -- 0.01 VTH -- V V DD Drop to Reset Delay tRD -- 20 -- μs -- 0 -- ms 35 55 75 ms 143 220 297 ms 292 450 608 ms VDD < VTH(MIN) ,ISINK = 3.5mA, VTH ≥ 3V -- -- 0.4 VDD < VTH(MIN) ,ISINK = 1.2mA, VTH ≥ 1.8V -- -- 0.3 VTH(MIN) > VDD > 1V, ISINK = 0.5mA -- -- 0.3 VT H = 3V , V DD = 4.5V Drop = VTH −125mV RT9819A/E Reset Active Time Out Period RT9819B/F RT9819C/G tRP VDD ≥ 1.02 × VTH RT9819D/H RESET Output Voltage Low V OL V V To be continued DS9819-05 August 2007 www.richtek.com 3 RT9819 Parameter Symbol RESET Output Voltage High VOH RESET Output Voltage Low VOL Test Conditions Min Typ Max VDD > VTH(MAX) , ISOURCE = 800μA, V TH ≥ 3V V DD −1.5 -- -- VDD > VTH(MAX) , ISOURCE = 500μA, V TH ≥ 1.8V 0.8 V DD -- -- VDD > VTH(MAX) , ISOURCE = 200μA, V TH ≥ 1.1V 0.8 V DD -- -- VDD > VTH(MAX) ,ISINK = 3.5mA, VTH ≥ 3V -- -- 0.4 VDD > VTH(MAX) ,ISINK = 1.2mA, VTH ≥ 1.8V -- -- 0.3 VDD > VTH(MAX) ,ISINK = 0.5mA, VTH ≥ 1.2V -- -- 0.3 0.8 V DD -- -- 0.8 V DD -- -- V DD −1.5 -- -- 1.1V < V DD < VTH(MIN) , ISOURCE = 200μA RESET Output Voltage High VOH 1.8V < V DD < VTH(MIN) , ISOURCE = 500μA 3V < V DD < V TH(MIN) , ISOURCE = 800μA Units V V V 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. www.richtek.com 4 DS9819-05 August 2007 RT9819 Typical Operating Characteristics Nch Driver Output Current vs. VDS Nch Driver Output Current vs. VDS 2.4 60 RT9819A-12 VDD = 1.1V VDD = 2.8V 50 Output Current (mA) Output Current (mA) 2 RT9819C-30 1.6 1.2 VDD = 1.0V 0.8 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 VDS (V) RT9819A-45 Output Voltage (V) Output Current (mA) 3.5 RT9819A 6 80 VDD = 4.4V = 4.0V = 3.5V = 3.0V = 2.5V = 2.0V = 1.5V 60 40 20 5 4 5.0V 3 2 3.0V 2.9V 1 0 0 0 1 2 3 4 5 0 1 VDS (V) RT9819A-12 Supply Current IDD (uA) 80°C 4 25°C 3 2 3 4 5 6 Supply Current vs. Input Voltage 4 5 2 Input Voltage (V) Supply Current vs. Input Voltage Supply Current (uA) 3 Output Voltage vs. Input Voltage 7 100 6 2.5 VDS (V) Nch Driver Output Current vs. VDS 120 2 -30°C 1 0 RT9819C-30 80°C 3 25°C 2 -30°C 1 0 0 1 2 3 4 Input Voltage (V) DS9819-05 August 2007 5 6 0 1 2 3 4 5 6 Input Voltage (V) www.richtek.com 5 RT9819 Supply Current vs. Input Voltage 4 Power-Down Reset Delay vs. Temperature 15 Power-Down Reset Delay (us) RT9819A-45 Supply Current (uA) 80°C 3 25°C -30°C 2 1 0 RT9819A-12 12 9 VDROP = 200mV VDROP = 150mV 6 VDROP = 250mV 3 0 0 1 2 3 4 5 6 -50 -25 0 Power-Down Reset Delay vs. Temperature RT9819C-30 40 35 30 25 VDROP = 200mV 20 VDROP = 150mV 15 VDROP = 250mV 10 5 0 100 125 RT9819A-45 40 35 30 VDROP = 200mV 25 VDROP = 150mV 20 15 VDROP = 250mV 10 5 -25 0 25 50 75 100 125 -50 -25 0 Temperature (°C) 50 75 100 125 Nch Driver Sink Current vs. Input Voltage 50 RT9819C-30, VDS = 0.5V RT9819A-45, VDS = 0.5V -30°C Sink Current I SINK (mA) -30°C 30 25°C 20 25 Temperature (°C) Nch Driver Sink Current vs. Input Voltage Sink Current I SINK (mA) 75 0 -50 40 50 Power-Down Reset Delay vs. Temperature 45 Power-Down Reset Delay (us) Power-Down Reset Delay (us) 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 Input Voltage (V) www.richtek.com 6 2.5 3 3.5 0 1 2 3 4 5 Input Voltage (V) DS9819-05 August 2007 RT9819 Reset Threshold Deviation vs. Temperature Pch Driver Output Current vs. Input Voltage 25 RT9819 RT9819C-30 VDS = 2.1V 5.0V 5.00 20 4.5V Output Current (mA) Reset Threshold Deviation (V) 6.00 4.2V 4.00 3.00 2.2V 2.00 VDS = 1.5V 15 VDS = 1.0V 10 VDS = 0.5V 5 1.2V 1.00 0 -50 -25 0 25 50 75 100 0 125 1 2 Temperature (°C) (μs) Power-Up Reset Time-Out (ms) Power-Up Reset Time-Out (ms) 400 VTH = 2.9V VTH = 3.0V 200 100 -50 RT9819A 75 VTH = 5.0V 50 VTH = 4.5V 25 -25 0 25 50 75 100 -50 125 -25 160 Nch Driver Output Current (mA) RT9819 100 10 VTH = 3.0V 1 VTH = 2.9V VTH = 5.0V 0.01 0.0001 25 50 75 100 125 Nch Driver Output Current vs. VDS Output Delay Time vs. Load Capacitance 0.1 0 Temperature (°C) Temperature (°C) Output Delay Time (ms) 6 0 0 1000 5 Power-Up Reset Time-Out vs. Temperature 100 RT9819C 300 4 Input Voltage (V) Power-Up Reset Time-Out vs. Temperature 500 3 RT9819G-31 140 120 100 VDD = 6.0V = 5.5V = 5.0V = 4.5V = 4.0V = 3.5V 80 60 40 20 0 0.0010 0.0100 0.1000 Load Capacitance (uF) DS9819-05 August 2007 1.0000 0 1 2 3 4 5 6 VDS (V) www.richtek.com 7 RT9819 Nch Driver Output Current vs. Input Voltage RT9819G-31 VDS = 0.5V -30°C 50 25°C 40 80°C 30 Power Down Reset Time-Out vs. Temperature Power Down Reset Time-Out (ms) Nch Driver Output Current (mA)1 60 20 10 RT9819G-31 400 300 200 100 0 0 7 1 2 3 4 5 -50 6 -25 0 25 50 75 100 125 Input Voltage (V) Temperature (°C) Output Voltage vs. Input Voltage Power-Down Reset Time-Out vs. Temperature Power-Down Reset Time-Out (us) 0 RT9819G-31 6 Output Voltage (V) 500 5 4 3 2 1 30 RT9819G-31 25 20 VDROP = 200mV VDROP = 150mV 15 10 VDROP = 250mV 5 0 0 0 1 2 3 4 Input Voltage (V) www.richtek.com 8 5 6 -50 -25 0 25 50 75 100 125 Temperature (°C) DS9819-05 August 2007 RT9819 Application Information 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. DS9819-05 August 2007 www.richtek.com 9 RT9819 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 DS9819-05 August 2007 RT9819 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 DS9819-05 August 2007 www.richtek.com 11 RT9819 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 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 12 DS9819-05 August 2007