RT9802

Preliminary RT9802 User Programmable Micro-Power Voltage Detectors General Description The RT9802 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 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. The RT9802 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 lasts for the whole period of Reset Active Time-out period. RT9802 is CMOS, active-low output and provided in SOT-23-6 package. Features User Programmable Threshold 1.5V to 5V in 0.1V Step with ± 3% Accuracy Low Supply Current 3μA Quick Reset within 20μs Built-in Recovery Delay 200ms Low Functional Supply Voltage 0.9V Small SOT-23-6 Package RoHS Compliant and 100% 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, otherwise visit our website for detail. Ordering Information RT9802Package Type E : SOT-23-6 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 Pin Configurations (TOP VIEW) VSET1 VSET2 VDD 6 1 5 2 4 3 VSET0 GND RESET SOT-23-6 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. Note : There is no pin1 indicator on top mark for SOT-23-6 type, and pin 1 will be lower left pin when reading top mark from left to right. DS9802-07 March 2007 www.richtek.com 1 RT9802 Typical Application Circuit Preliminary μP VDD GND RESET VSET0 VSET1 RT9802 GND VSET2 RESET VDD RT9802B VTH = 2.5V in this example Functional Pin Description Pin Name VSET0 GND RESET VDD VSET1 VSET2 Pin Function Threshold Voltage Selection Pin 1 Ground Pin Reset Pulse Output, Negative Pulse Power Pin Threshold Voltage Selection Pin 2 Threshold Voltage Selection Pin 3 Function Block Diagram VDD Internal Clock VSET0 VSET1 VSET2 P MOS VSET CMP Timer N MOS Threshold Voltage Setting GND POR Power On Reset RESET www.richtek.com 2 DS9802-07 March 2007 Preliminary Absolute Maximum Ratings RT9802 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 Storage Temperature Range ---------------------------------------------------------------------------------------- −65°C to 125°C Package Thermal Resistance SOT-23-6, θJA ----------------------------------------------------------------------------------------------------------- 250°C /W Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260°C Electrical Characteristics (VDD = 3.0, unless specified) Parameter Operating VDD (VOUT) Range Supply Current Reset Threshold Threshold Voltage Accuracy VCC Drop to Reset Delay Reset Active Time Out Period VSET Pin Input Threshold RESET Output Voltage Symbol VDD IDD VTH ΔVTH tRD tRP VIL VIH VOL Test Conditions Min 0.9 Typ -- Max 6 3 3.3 Units V μA V % μs ms V V VDD = 1.5V ~ 3.5V, IOUT = 0 VDD = 3.5V ~ 5V, IOUT = 0 TA = 27°C TA = 27°C Drop = -125mV VDD ≥ 1.02×VTH, Programmable TA = 27°C TA = 27°C VDD < VTH, ISINK = 3.5mA -- -------- Note1 -3 -200 0.2VDD 0.85VDD 0.4 20 ----- DS9802-07 March 2007 www.richtek.com 3 RT9802 RT9802A 5 4.9 4.8 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3 2.9 2.8 2.7 2.6 2.5 RT9802B 4 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2 1.9 1.8 1.7 1.6 1.5 Preliminary Note 1: Pin Conditions for Programmable Threshold Voltage Setting VSET0 input VDD VDD VDD VDD VDD VDD VDD VDD VDD floating floating floating floating floating floating floating floating floating GND GND GND GND GND GND GND GND VSET1 input VDD VDD VDD floating floating floating GND GND GND VDD VDD VDD floating floating floating GND GND GND VDD VDD VDD floating floating floating GND GND VSET2 input VDD floating GND VDD floating GND VDD floating GND VDD floating GND VDD floating GND VDD floating GND VDD floating GND VDD floating GND VDD floating VDD: bond to VDD; 0: bond to GND; f: no bonding www.richtek.com 4 DS9802-07 March 2007 Preliminary Outline Dimension RT9802 H D L C B b A A1 e Symbol A A1 B b C D e H L Dimensions In Millimeters Min 0.889 0.000 1.397 0.250 2.591 2.692 0.838 0.080 0.300 Max 1.295 0.152 1.803 0.560 2.997 3.099 1.041 0.254 0.610 Dimensions In Inches Min 0.031 0.000 0.055 0.010 0.102 0.106 0.033 0.003 0.012 Max 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024 SOT-23-6 Surface Mount Package Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Richtek Technology Corporation Taipei Office (Marketing) 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com DS9802-07 March 2007 www.richtek.com 5