RT9801A/B User Programmable Micro-Power Voltage Detectors General Description Features The RT9801A/B is a micro-power voltage detector supervising the power supply voltage level for microprocessors (μP) or digital systems. It provides user programmable threshold levels with 0.1V step ranging from 1.5V to 5V, which covers most digital applications. It features low supply current of 3μA. Selection of VTH is z easily achieved through 3 pins connected to GND, VDD or floating for different threshold voltage settings. Two versions of threshold voltages, 1.5V to 4V and 2.5V to 5V, which are programmed in factory are offered by customer demands. z z z z z Applications z z z z z Computers Controllers Intelligent Instruments Critical μP and μC Power Monitoring Portable/Battery-Powered Equipment Pin Configurations RT9801A/B is N-Channel, open-drain output and provided in SOT-23-6 package. VDD Ordering Information VSET2 (TOP VIEW) VSET1 The RT9801A/B 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. Reset signal will release after VDD is recovered and last for the whole period of Reset Active Time-out period. z User Programmable Threshold 1.5V to 5V in 0.1V Step with ±3% Accuracy Low Supply Current 3μ μA Quick Reset within 20μ μs Built-in Recovery Delay 200ms Low Functional Supply Voltage 0.9V Small SOT-23-6 Package RoHS Compliant and 100% Lead (Pb)-Free 6 5 4 2 3 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Reset Threshold A : 2.5V to 5V B : 1.5V to 4V RESET VSET0 Package Type E : SOT-23-6 GND RT9801 SOT-23-6 Typical Application Circuit 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. VSET0 μP VDD GND RESET VSET1 RT9801 GND VSET2 RESET VDD Pull Up Marking Information RT9801 VTH = 2.5V in this example For marking information, contact our sales representative directly or through a Richtek distributor located in your area, otherwise visit our website for detail. DS9801AB-12 June 2009 www.richtek.com 1 RT9801A/B Test Circuits A VDD VDD V RT9801A/B VDD R 100K RESET V VDD Oscilloscopes GND GND Detection Voltage VDD P.G RT9801A/B RESET RT9801A/B Current Consumption VDD 100K RESET CRT 6V VDD V RT9801A/B RESET CL GND GND Dynamic Response A V VRESET Output Transistor Current Functional Pin Description Pin Name Pin Function VSET0 Threshold Voltage Selection Pin GND Ground Pin RESET Reset Pulse Output, Negative Pulse VDD Power Pin VSET1 Threshold Voltage Selection Pin VSET2 Threshold Voltage Selection Pin Note : Threshold Voltage Setting refer to the Table.1 Function Block Diagram VDD Internal Clock VSET0 VSET1 RESET VSET CMP VSET2 Timer N MOS GND Threshold Voltage Setting POR Power On Reset www.richtek.com 2 DS9801AB-12 June 2009 RT9801A/B Absolute Maximum Ratings z z z Terminal Voltage (with Respect to GND) VDD ------------------------------------------------------------------------------------------------------------------------ –0.3V to 6.0V All Other Inputs -------------------------------------------------------------------------------------------------------- –0.3V to VDD+0.3V Input Current, VDD ----------------------------------------------------------------------------------------------------- 20mA Continuous Power Dissipation, PD @ TA = 25°C SOT-23-6 ---------------------------------------------------------------------------------------------------------------- 0.25W Operating Junction Temperature Range -------------------------------------------------------------------------- –40°C to 125°C z Storage Temperature Range ---------------------------------------------------------------------------------------- –65°C to 125°C z Package Thermal Resistance SOT-23-6, θJA ----------------------------------------------------------------------------------------------------------- 250°C /W z Lead Temperature (Soldering, 10sec.) ---------------------------------------------------------------------------- 260°C z Electrical Characteristics (VDD = 3V, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Units 0.9 -- 6 V Operating VDD Range VDD Supply Current IDD VDD = 1.5V ~ 3.5V, ISINK = 0 VDD = 3.5V ~ 5V, ISINK = 0 -- -- 3 -- -- 3.3 Reset Threshold VTH TA = 27°C -- Note1 -- V Threshold Voltage Accuracy ΔVTH TA = 27°C -- -- 3 % VDD Drop to Reset Delay tRD Drop = -125mV -- -- 20 μs Reset Active Timeout Period tRP VDD ≥ 1.02×VTH, Programmable 120 200 280 ms VIL TA = 27°C -- 0.15VDD -- VIH TA = 27°C -- 0.85VDD -- VOL VDD < VTH, ISINK = 3.5mA -- 0.4 -- VSET Pin Input Threshold RESET Output Voltage μA V V Timing Diagram VDD VDD VTH Drop VTH tRP VRESET VRESET tRD DS9801AB-12 June 2009 www.richtek.com 3 RT9801A/B Table 1: Pin Conditions for Programmable Threshold Voltage Setting RT9801A RT9801B VSET0 VSET1 VSET2 5.0 4.0 H H H 4.9 3.9 H H F 4.8 3.8 H H L 4.7 3.7 H F H 4.6 3.6 H F F 4.5 3.5 H F L 4.4 3.4 H L H 4.3 3.3 H L F 4.2 3.2 H L L 4.1 3.1 F H H 4.0 3.0 F H F 3.9 2.9 F H L 3.8 2.8 F F H 3.7 2.7 F F F 3.6 2.6 F F L 3.5 2.5 F L H 3.4 2.4 F L F 3.3 2.3 F L L 3.2 2.2 L H H 3.1 2.1 L H F 3.0 2.0 L H L 2.9 1.9 L F H 2.8 1.8 L F F 2.7 1.7 L F L 2.6 1.6 L L H 2.5 1.5 L L F Note : 1. H : Connected to VDD 2. L : Connected to GND 3. F : Floating www.richtek.com 4 DS9801AB-12 June 2009 RT9801A/B Typical Operating Characteristics N-Ch Driver Sink Current vs. VRESET N-Ch Driver Sink Current vs. VRESET 7 12 6 10 Sink Current I SINK (mA) Sink Current I SINK (mA) VDD = 2.2V VDD = 1.7V 5 4 VDD = 1.5V 3 2 6 4 VDD = 1.5V 2 TA = 25°C VTH = 2V 1 VDD = 2.0V 8 TA = 25°C VTH = 0 0 0 0.5 1 1.5 2 2.5 0 3 0.5 1 VRESET (V) N-Ch Driver Sink Current vs. VRESET 2.5 3 36 VDD = 2.8V 15 Sink Current I SINK (mA) Sink Current I SINK (mA) 2 N-Ch Driver Sink Current vs. VRESET 18 12 9 VDD = 2.0V 6 3 VDD = 4.0V 30 VDD = 3.5V 24 VDD = 3.0V 18 VDD = 2.5V 12 TA = 25°C VTH = 3V VDD = 1.5V VDD = 2.0V 6 TA = 25°C VTH = 4.5V VDD = 1.5V 0 0 0 0.5 1 1.5 2 2.5 3 0 1 2 VRESET (V) 3 N-Ch Driver Sink Current vs. VRESET VRESET vs. VDD 7 TA = 25°C VDD = 4.5V 6 5.0V 32 VDD = 4.0V 5 VRESET (V) 24 VDD = 3.5V VDD = 3.0V 16 VDD = 2.5V 8 TA = 25°C VTH = 5V VDD = 1.5V 0 1 2 3 VRESET (V) DS9801AB-12 June 2009 4.5V 4 3.0V 3 2.4V 2.0V 2 VDD = 2.0V 0 4 VRESET (V) 40 Sink Current I SINK (mA) 1.5 VRESET (V) 4 5 1 0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 VDD (V) www.richtek.com 5 RT9801A/B Supply Current vs. Input Voltage Supply Current vs. Input Voltage 4 3 Supply Current IDD (uA) Supply Current IDD (uA) 4 TA = 25°C TA = 80°C 2 TA = -30°C 1 TA = 25°C 3 TA = 80°C 2 TA = -30°C 1 VTH = 2.4V VTH = 2V 0 0 0 1 2 3 4 5 0 6 2 Supply Current vs. Input Voltage Supply Current vs. Input Voltage TA = 80°C Supply Current IDD (uA) TA = 80°C TA = 25°C 3 2 TA = -30°C 1 TA = 25°C 4 3 TA = -30°C 2 1 VTH = 4.5V VTH = 3V 0 0 0 1 2 3 4 5 0 6 1 Input Voltage VDD (V) 2 3 4 5 6 Input Voltage VDD (V) Reset Threshold Deviation vs. Temperature Supply Current vs. Input Voltage 5.2 5 VTH = 4.8 TA = 80°C 4 Threshold Voltage (V) Supply Current IDD (uA) 6 5 4 Supply Current IDD (uA) 4 Input Voltage VDD (V) Input Voltage VDD (V) 3 TA = -30°C 2 TA = 25°C 1 4.4 VTH = 4.5V 4 3.6 VTH = 3.2 2.8 VTH = 2.5V VTH = 5V 0 2.4 0 1 2 3 4 Input Voltage VDD (V) www.richtek.com 6 5 6 -40 -15 10 35 60 85 Temperature (°C) DS9801AB-12 June 2009 RT9801A/B N-Ch Driver Sink Current vs. Input Voltage N-Ch Driver Sink Current vs. Input Voltage 10 10 Sink Current I SINK (mA) Sink Current I SINK (mA) VTH = 2.0V VRESET = 0.5V 8 TA = -30°C 6 TA = 25°C 4 2 VTH = 2.5V VRESET = 0.5V 8 TA = -30°C TA = 25°C 6 4 TA = 80°C 2 TA = 80°C 0 0 0 0.5 1 1.5 2 2.5 0 3 0.5 Input Voltage VDD (V) VTH = 3V VRESET = 0.5V 14 Sink Current I SINK (mA) Sink Current I SINK (mA) 2.5 3 16 TA = -30°C 8 TA = 25°C 6 4 TA = 80°C 2 VTH = 4.5V VRESET = 0.5V TA = -30°C 12 TA = 25°C 10 8 6 TA = 80°C 4 2 0 0 0 0.5 1 1.5 2 2.5 3 3.5 0 1 Input Voltage VDD (V) 2 3 4 5 Input Voltage VDD (V) N-Ch Driver Sink Current vs. Input Voltage Reset Active Timeout Period vs. Temperature 18 350 VTH = 5V VRESET = 0.5V Reset Active Timeout Period (ms) Sink Current I SINK (mA) 2 N-Ch Driver Sink Current vs. Input Voltage N-Ch Driver Sink Current vs. Input Voltage 15 1.5 Input Voltage VDD (V) 12 10 1 TA = -30°C 12 TA = 25°C 9 6 TA = 80°C 3 0 VTH = 300 250 VTH = 2.4V VTH = 200 VTH = 150 VTH = 4.5V 100 50 0 1 2 3 4 Input Voltage VDD (V) DS9801AB-12 June 2009 5 6 -40 -15 10 35 60 85 Temperature (°C) www.richtek.com 7 RT9801A/B VDD Drop to Reset Delay vs. Temperature VTH = 3.0 VDROP = 200mV 2.0 VDROP = 150mV 1.0 VDROP = 250mV VDD Drop to Reset Delay vs. Temperature 3.0 VTH = VDD Drop to Reset Delay ( us ) A VDD Drop to Reset Delay ( us ) A 4.0 2.5 2.0 1.5 VDROP = 200mV 0.5 VDROP = 250mV 0.0 0.0 -40 -15 10 35 60 -40 85 -15 VTH = 1.2 VDROP = 200mV VDROP = 150mV 0.6 VDROP = 250mV 0.3 1.5 VDD Drop to Reset Delay ( us ) A VDD Drop to Reset Delay ( us ) A VDD Drop to Reset Delay vs. Temperature 0.9 -40 60 85 VDD Drop to Reset Delay vs. Temperature VTH = 1.2 VDROP = 200mV 0.9 VDROP = 150mV 0.6 VDROP = 250mV 0.3 -15 10 35 60 -40 85 -15 10 35 60 VDD Drop to Reset Delay vs. Temperature Output Delay Time vs. Load Capacitance 1.2 VDROP = 200mV 0.9 VDROP = 150mV 0.6 VDROP = 250mV 0.3 Output Delay Time t P (ms) 1000 VTH = 100 VTH = VTH = 10 VTH = VTH = VTH = 3V 0.0 -40 -15 10 35 Temperature (°C) www.richtek.com 8 85 Temperature (°C) Temperature (°C) VDD Drop to Reset Delay ( us ) A 35 0.0 0.0 1.5 10 Temperature ((°C) C) Temperature((°C) C) 1.5 VDROP = 150mV 1.0 60 85 1 0.0001 TA = 25°C 0.001 0.01 0.1 Load Capacitance COUT ( uF ) DS9801AB-12 June 2009 RT9801A/B Outline Dimension H D L C B b A A1 e Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 0.889 1.295 0.031 0.051 A1 0.000 0.152 0.000 0.006 B 1.397 1.803 0.055 0.071 b 0.250 0.560 0.010 0.022 C 2.591 2.997 0.102 0.118 D 2.692 3.099 0.106 0.122 e 0.838 1.041 0.033 0.041 H 0.080 0.254 0.003 0.010 L 0.300 0.610 0.012 0.024 SOT-23-6 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: [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. DS9801AB-12 June 2009 www.richtek.com 9