RT9801 RICHTEK | Alldatasheet

Document overview

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Technical content

Features

z User Programmable Threshold 1.5V to 5V in 0.1V Step with ±±±±3% Accuracy z Low Supply Current 3µµµµA z Quick Reset within 20µµµµS z Built-in Recovery Delay 200mS z Low Functional Supply Voltage 0.9V z Small SOT-26 Package

Applications

z Critical µP and µC Power Monitoring z Portable/Battery-Powered Equipment Pin Configurations Part Number Pin Configurations RT9801 CE (Plastic SOT-26) TOP VIEW 1. VSET0 2. GND 3. RESET 4. VDD 5. VSET2 6. VSET1 Typical Application Circuit Operating temperature range C: Commercial standard Package Type E : SOT-26 Reset Threshold A : 2.5V~5V B : 1.5V~4V VSET0 GND RESET VSET1 VSET2 VDD GND RESET VDD Pull Up RT9801B V TH = 2.5V in this example µP RT9801 321

www.richtek-ic.com.tw DS9801-00 January 2002 Pin Description Pin Name Pin Function VSET0 Threshold Voltage Selection Pin 1 GND Ground Pin RESET Reset Pulse Output, Negative Pulse VDD Power Pin VSET1 Threshold Voltage Selection Pin 2 VSET2 Threshold Voltage Selection Pin 3 Function Block Diagram VSET CMP TIMER VDD POR RESET N Threshold Voltage Setting Power On Reset Internal Clock VSET0 VSET1 VSET2

DS9801-00 January 2002 www.richtek-ic.com.tw Absolute Maximum Ratings z Terminal Voltage (with Respect to GND) VDD -0.3V to 6.0V All Other Inputs -0.3V to VDD+0.3V z Input Current, VDD 20mA z Continuous Power Dissipation, PD @ TA = 25°C SOT-26 0.25W z Operating Junction Temperature Range -40 °C ~ 125°C z Storage Temperature Range -65 °C ~ 125°C z Package Thermal Resistance SOT-26, θJA 250°C /W z Lead Temperature (Soldering, 5sec.) 260 °C

Electrical Characteristics

(VDD = 3.0, unless specified) Parameter Symbol Test Conditions Min Typ Max Units Operating VDD (VOUT) Range V DD 0.9 -- 6 V -- 3 Supply Current IDD VDD = 1.5V ~ 3.5V, IOUT = 0 VDD = 3.5V ~ 5V, IOUT = 0 3.3 µA Reset Threshold VTH TA = 27°C -- Note1 -- V Threshold Voltage Accuracy ∆VTH TA = 27°C -- 3 % VCC Drop to Reset Delay t RD Drop = -125mV -- -- 20 µS Reset Active Time Out Period tRP VDD ≥ 1.02×VTH, Programmable -- 200 -- mS VIL TA = 27°C -- 0.15VDD -- VSET Pin Input Threshold VIH TA = 27°C -- 0.85VDD -- V RESET Output Voltage VOL VDD < VTH, ISINK = 3.5mA -- 0.4 -- V

www.richtek-ic.com.tw DS9801-00 January 2002 Note 1: Pin Conditions for Programmable Threshold Voltage Setting RT9801A RT9801B Vset0 input Vset1 input Vset2 input

54 V DD VDD VDD

4.9 3.9 V DD VDD floating 4.8 3.8 V DD VDD GND 4.7 3.7 V DD floating V DD 4.6 3.6 V DD floating floating 4.5 3.5 V DD floating GND 4.4 3.4 V DD GND V DD 4.3 3.3 V DD GND floating 4.2 3.2 V DD GND GND 4.1 3.1 floating V DD VDD 4 3 floating V DD floating 3.9 2.9 floating V DD GND 3.8 2.8 floating floating V DD 3.7 2.7 floating floating floating 3.6 2.6 floating floating GND 3.5 2.5 floating GND V DD 3.4 2.4 floating GND floating 3.3 2.3 floating GND GND 3.2 2.2 GND V DD VDD 3.1 2.1 GND V DD floating

32 G N D V DD GND

2.9 1.9 GND floating V DD 2.8 1.8 GND floating floating 2.7 1.7 GND floating GND 2.6 1.6 GND GND V DD 2.5 1.5 GND GND floating VDD: bond to VDD; 0: bond to GND; f: no bonding

DS9801-00 January 2002 www.richtek-ic.com.tw

Package Information

Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 0.889 1.295 0.035 0.051 B 1.397 1.803 0.055 0.071 b 0.356 0.559 0.014 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 0.102 0.254 0.004 0.010 L 0.356 0.610 0.014 0.024 SOT- 26 Surface Mount Package b BC D L H A1e A

www.richtek-ic.com.tw DS9801-00 January 2002 RICHTEK TECHNOLOGY CORP. Headquarter 6F, No. 35, Hsintai Road, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749 RICHTEK TECHNOLOGY CORP. Taipei Office (Marketing) 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek-ic.com.tw