RT Micro-Power Voltage Detectors. General Description. Features. Applications. Ordering Information. Marking Information
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1 RT9818 Micro-Power Voltage Detectors General Description 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.1v per step ranging from 1.V to V, which covers most digital applications. It features low supply current of μa. The RT9818 performs supervisory function by sending out a reset signal whenever the V DD voltage falls below a preset threshold level. This reset signal will last the whole period before V DD recovering. Once V DD recovered upcrossing the threshold level, the reset signal will be released after a certain delay time. RT9818 is provided in SC-8, SC-7-, SOT--, SOT-- and SOT-89 packages. Ordering Information RT Package Type U : SC-7- V : SOT-- VL : SOT-- (L-Type) B : SOT-- X : SOT-89 Y : SC-8 YR : SC-8 (R-Type) Lead Plating System P : Pb Free G : Green (Halogen Free and Pb Free) Threshold Voltage 1 : 1.V 1 : 1.V : 9 :.9V :.V Reset Active Timeout Period A = ms () B = ms () C = ms () D = ms () E = ms () F = ms () G = ms () H = ms () Note : Richtek products are : RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-. Suitable for use in SnPb or Pb-free soldering processes. Copyright 16 Richtek Technology Corporation. All rights reserved. DS August 16 Features Internally Fixed Threshold 1.V to V in.1v Step High Accuracy ±1.% Low Supply Current μa No External Components Required Quick Reset within μs Built-In Recovery Delay Include ms, ms, ms, ms Options Low Functional Supply Voltage.9V N-Channel Open-Drain Output Small SC-8, SC-7-, SOT--, SOT--, SOT-89 Packages RoHS Compliant and 1% Lead (Pb)-Free Applications 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 P / 1k Pull Up RT9818 GND / 1
2 Pin Configuration GND / SC-8 NC (TOP VIEW) / NC SC-8 (R-Type) GND GND / SC-7- NC NC 1 / GND SOT-- GND / SOT-- (L-Type) / GND SOT-- / GND SOT-89 Functional Pin Description Pin Name Pin Function GND Ground. Active low open-drain reset output. Active high open-drain reset output. Power pin. Functional Block Diagram / VSET Threshold Voltage Setting CMP POR Timer N MOS GND Power On Reset Timing Diagram V DD V TH V V Delay Time (,,, ms) V V Delay Time (,,, ms) V Copyright 16 Richtek Technology Corporation. All rights reserved. DS August 16
3 Absolute Maximum Ratings (Note 1) RT9818 Terminal Voltage (with Respect to GND) V DD V to 6V All Other Inputs V to 6V Input Current, I ma Power Dissipation, P T A = C SC-7 / SC W SOT W SOT W SOT W Package Thermal Resistance (Note ) SC-7 / SC-8, θ JA C/W SOT--, θ JA C/W SOT--, θ JA C/W SOT-89, θ JA C/W Lead Temperature (Soldering, 1sec.) C Storage Temperature Range C to 1 C ESD Susceptibility (Note ) HBM (Human Body Model) kv Recommended Operating Conditions (Note ) Junction Temperature Range C to 1 C Ambient Temperature Range C to 8 C Electrical Characteristics ( = V, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Operating V DD (V OUT ) Range V DD V Supply Current I DD V TH = V, V DD =.V, T A = 7 C -- 8 A Reset Threshold V TH T A = 7 C to -- V Threshold Voltage Accuracy V TH T A = 7 C % V DD Drop to Reset Delay t RD Drop = V TH 1mV s Reset Active Time Out Period Output Voltage Low (Note ) RT9818A/E RT9818B/F 7 t RP V DD 1. x V TH RT9818C/G 1 97 RT9818D/H 9 68 V OL = V DD < V TH I SINK >.ma V Hysteresis Width V HYS --.1V TH.16V TH V ms Copyright 16 Richtek Technology Corporation. All rights reserved. DS August 16
4 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. θ JA is measured at T A = C on a low effective thermal conductivity single-layer test board per JEDEC 1-. Note. Note. Note. Devices are ESD sensitive. Handling precaution is recommended. The device is not guaranteed to function outside its operating conditions. The voltage V OL can be calculated by V OL = V DD Ir * R. Where R is the pull-up resistor and Ir is the current flowing through the pull-up resistor. For typical application (R=1kΩ), V OL is less than.v. Copyright 16 Richtek Technology Corporation. All rights reserved. DS August 16
5 Typical Operating Characteristics Nch Driver Output Current vs. V DS Nch Driver Output Current vs. V DS. RT9818A-1 6 RT9818C- Output Current (ma) = 1.1V = 1V Output Current (ma) 1 =.8V =.V = V = 1.V V DS (V) V DS (V) 1 Nch Driver Output Current vs. V DS RT9818A- 7 RT9818 Output Voltage vs. Input Voltage 1 6 Output Current (ma) 8 6 =.V = V =.V = V =.V = V = 1.V Output Voltage (V) 1 1.V.V 1 V DS (V) 1 6 Supply Current vs. Input Voltage Supply Current vs. Input Voltage 6 RT9818A-1. RT9818C- Supply Current (μa) 8 C C C Supply Current (μa) C C C Copyright 16 Richtek Technology Corporation. All rights reserved. DS August 16
6 Supply Current (μa) Supply Current vs. Input Voltage RT9818A- 8 C C - C 1 6 Power Down Reset Delay (µs) Power Down Reset Delay vs. Temperature 1 RT9818A VDROP = mv VDROP = 1mV 6 VDROP = mv Power Down Reset Delay (µs) 1 1 Power Down Reset Delay vs. Temperature RT9818C- VDROP = mv VDROP = 1mV VDROP = mv Power Down Reset Delay (µs) Power Down Reset Delay vs. Temperature RT9818A- VDROP = mv VDROP = 1mV VDROP = mv Reset Threshold (V) Reset Threshold Deviation vs. Temperature 6 RT9818 V.V.V.V 1.V Sink Current ISINK (ma) Nch Driver Sink Current vs. Input Voltage RT9818C-, VDS =.V C 1 1 C 8 C Copyright 16 Richtek Technology Corporation. All rights reserved. 6 DS August 16
7 Sink Current ISINK (ma) Nch Driver Sink Current vs. Input Voltage RT9818A-, VDS =.V C C 8 C 1 Power Up Reset Time-Out (ms) Power Up Reset Time-Out vs. Temperature RT9818C VTH =.9V VTH = V Power Up Reset Time-Out (µs) Power Up Reset Time-Out vs. Temperature RT9818A VTH = V VTH =.V Output Delay Time (ms) Output Delay Time vs. Load Capacitance 1 RT VTH = 1.V.1 VTH =.V Load Capacitance (µf) Nch Driver Output Current (ma) Nch Driver Output Current vs. V DS RT9818G-1 = 6V =.V = V =.V = V =.V Nch Driver Output Current (ma)1 6 1 Nch Driver Output Current vs. Input Voltage RT9818G-1 VDS =.V C C 8 C 1 6 V DS (V) 1 6 Copyright 16 Richtek Technology Corporation. All rights reserved. DS August 16 7
8 Power Down Reset Time-Out (ms) Power Down Reset Time-Out vs. Temperature RT9818G Output Voltage (V) Output Voltage vs. Input Voltage RT9818G Power Down Reset Time-Out (µs) Power Down Reset Time-Out vs. Temperature 1 1 RT9818G-1 VDROP = mv VDROP = 1mV VDROP = mv Threshold Voltage (V) Threshold Voltage vs. Temperature RT9818A- Rising Falling Temperature ( C) Threshold Voltage (V) Threshold Voltage vs. Temperature RT9818C- Rising Falling Temperature ( C) Copyright 16 Richtek Technology Corporation. All rights reserved. 8 DS August 16
9 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 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.% 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.% below nominal. Copyright 16 Richtek Technology Corporation. All rights reserved. DS August 16 9
10 Outline Dimension D H L C B e A b A1 Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A A B b C D e 1..1 H L SC-7- Surface Mount Package Copyright 16 Richtek Technology Corporation. All rights reserved. 1 DS August 16
11 D e H L C B b b1 A e A1 Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A A B b b C D e 1..1 H L SC-8 Surface Mount Package Copyright 16 Richtek Technology Corporation. All rights reserved. DS August 16 11
12 D H L C B e A b A1 Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A A B b C D e H L SOT-- Surface Mount Package Copyright 16 Richtek Technology Corporation. All rights reserved. 1 DS August 16
13 D H L C B b A A1 e Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A A B b C D e H L SOT-- Surface Mount Package Copyright 16 Richtek Technology Corporation. All rights reserved. DS August 16 1
14 D D1 A C B C1 e e H A b b1 b Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A b B b C C D D e H Lead SOT-89 Surface Mount Package Richtek Technology Corporation 1F, No. 8, Tai Yuen 1 st Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (886)6789 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. DS August 16 1
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