RT9817 Micro-Power Voltage Detectors with Manual Reset General Description Features The RT9817 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 RT9817 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 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. RT9817 is provided in SC-82 and SOT-143 packages. z z z z z z z z z z z RT9817 z Package Type H : SOT-143 Y : SC-82 Note : z z - No External Components Required μs Quick Reset within 20μ Built-in Recovery Delay Include 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 100% Lead (Pb)-Free Applications z Ordering Information Internally Fixed Threshold 1.2V to 5V in 0.1V Step High Accuracy ±1.5% Low Supply Current 3μ μA z Computers Controllers Intelligent Instruments Critical μP and μC Power Monitoring Portable/Battery-Powered Equipment Pin Configurations Lead Plating System P : Pb Free (TOP VIEW) G : Green (Halogen Free and Pb Free) Threshold Voltage VDD MR VDD MR 12 : 1.2V 4 3 4 3 13 : 1.3V : 2 2 49 : 4.9V GND RESET/ GND RESET/ 50 : 5.0V RESET RESET Reset Active Timeout Period SOT-143 SC-82 A = 0ms (RESET) B = 55ms (RESET) C = 220ms (RESET) Marking Information D = 450ms (RESET) For marking information, contact our sales representative E = 0ms (RESET) F = 55ms (RESET) directly or through a RichTek distributor located in your G = 220ms (RESET) area, otherwise visit our website for detail. H = 450ms (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. DS9817-09 April 2011 www.richtek.com 1 RT9817 Typical Application Circuit RT9817 VDD GND up RESET/ RESET RESET/ RESET VDD MR Functional Pin Description Pin Name Pin Function GND Ground Pin RESET Active Low Push-Pull Reset Output RESET Active High Push-Pull Reset Output MR Manual Reset VDD Power Pin Function Block Diagram VDD MR VDD P MOS VSET CMP Timer RESET/ RESET N MOS Threshold Voltage Setting POR Power On Reset www.richtek.com 2 DS9817-09 April 2011 RT9817 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-82 -------------------------------------------------------------------------------------------------------------------- 0.25W SOT-143 ----------------------------------------------------------------------------------------------------------------- 0.285W Package Thermal Resistance (Note 2) SC-82, θJA --------------------------------------------------------------------------------------------------------------- 400°C SOT-143, θJA ------------------------------------------------------------------------------------------------------------ 350°C Lead Temperature (Soldering, 10sec.) ---------------------------------------------------------------------------- 260°C Storage Temperature Range ---------------------------------------------------------------------------------------- −65°C to 125°C ESD Susceptibility (Note 3) HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V 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 RT9817A/B/C/D 0.9 -- 6 RT9817E/F/G/H 1.1 -- 6 -- 3 8 μA -- 1.2 to 5.0 -- V Operating V DD (VOUT) Range VDD V Supply Current IDD Reset Threshold VTH Threshold Voltage Accuracy ΔVTH −1.5 -- +1.5 % Threshold Voltage Hysteresis VHYS -- 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 -- -- 0.4 -- -- 0.3 -- -- 0.3 VTH = 3V , VDD = 4.5V Drop = V TH −125mV RT9817A/E Reset Active Time Out Period RT9817B/F RT9817C/G tRP VDD ≥ 1.02 × VTH RT9817D/H VDD < V TH(MIN) ,ISINK = 3.5mA, VTH ≥ 3V RESET Output Voltage Low VOL VDD < V TH(MIN) ,ISINK = 1.2mA, VTH ≥ 1.8V VTH(MIN) > VDD > 1V, ISINK = 0.5mA V To be continued DS9817-09 April 2011 www.richtek.com 3 RT9817 Parameter RESET Output Voltage High RESET Output Voltage Low RESET Output Voltage High Symbol V OH V OL V OH Test Conditions Min Typ Max VDD > VTH(MAX) , ISOURCE = 800μA, VTH ≥ 3V VDD −1.5 -- -- VDD > VTH(MAX) , ISOURCE = 500μA, VTH ≥ 1.8V 0.8 V DD -- -- VDD > VTH(MAX) , ISOURCE = 200μA, VTH ≥ 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 1.1V < V DD < V TH(MIN) , ISOURCE = 200μA 0.8 V DD -- -- 1.8V < V DD < V TH(MIN) , ISOURCE = 500μA 0.8 V DD -- -- 3V < VDD < V TH(MIN) , ISOURCE = 800μA VDD −1.5 -- -- Unit 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. 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. www.richtek.com 4 DS9817-09 April 2011 RT9817 Typical Operating Characteristics Nch Driver Output Current vs. VDS Nch Driver Output Current vs. VDS 2.4 60 RT9817A-12 VDD = 1.1V VDD = 2.8V 50 Output Current (mA) Output Current (mA) 2 RT9817C-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) RT9817A-45 Output Voltage (V) Output Current (mA) 3.5 RT9817A 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) RT9817A-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 RT9817C-30 80°C 3 25°C 2 -30°C 1 0 0 1 2 3 4 Input Voltage (V) DS9817-09 April 2011 5 6 0 1 2 3 4 5 6 Input Voltage (V) www.richtek.com 5 RT9817 Supply Current vs. Input Voltage 4 Power-Down Reset Delay vs. Temperature 15 Power-Down Reset Delay (us) RT9817A-45 Supply Current (uA) 80°C 3 25°C -30°C 2 1 0 RT9817A-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 Power-Down Reset Delay (us) Power-Down Reset Delay (us) RT9817C-30 35 30 VDROP = 200mV 20 VDROP = 150mV 15 VDROP = 250mV 10 5 0 100 125 RT9817A-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 RT9817C-30, VDS = 0.5V RT9817A-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) 75 Power-Down Reset Delay vs. Temperature 45 40 25 50 Temperature (°C) Input Voltage (V) 45 25 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) DS9817-09 April 2011 RT9817 Reset Threshold Deviation vs. Temperature Pch Driver Output Current vs. Input Voltage 25 RT9817 RT9817C-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) Power-Up Reset Time-Out (ms) Power-Up Reset Time-Out (ms) 400 VTH = 2.9V VTH = 3.0V 200 100 6 RT9817A 75 VTH = 5.0V 50 VTH = 4.5V 25 0 0 -50 -25 0 25 50 75 100 -50 125 -25 Nch Driver Output Current (mA) 160 100 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 1000 0.1 0 Temperature (°C) Temperature (°C) Output Delay Time (ms) 5 Power-Up Reset Time-Out vs. Temperature 100 RT9817C 300 4 Input Voltage (V) Power-Up Reset Time-Out vs. Temperature 500 3 RT9817G-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) DS9817-09 April 2011 1.0000 0 1 2 3 4 5 6 VDS (V) www.richtek.com 7 RT9817 Nch Driver Output Current vs. Input Voltage RT9817G-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 RT9817G-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 RT9817G-31 6 Output Voltage (V) 500 5 4 3 2 1 30 RT9817G-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) DS9817-09 April 2011 RT9817 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. DS9817-09 April 2011 www.richtek.com 9 RT9817 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 www.richtek.com 10 DS9817-09 April 2011 RT9817 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 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. DS9817-09 April 2011 www.richtek.com 11