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Preliminary
RT9809
Micro-Power Voltage Detectors
General Description
The RT9809 is a micro-power voltage detector supervising the power supply voltage level for microprocessors (P) or digital systems. It provides internally fixed threshold levels with 0.1V per step ranging from 1.5V to 5V, which covers most digital applications. It features low supply current of 2.5A. The RT9809 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 up-crossing the threshold level, the reset signal will be released after a certain delay time. A 5% hysteresis splits the rising and falling threshold levels. RT9809 is provided in SOT-23 package.
Features
Internally Fixed Threshold 1.5V to 5V in 0.1V Step 2% Accuracy Low Supply Current 2.5A No External Components Required Quick Reset within 20S Built-in Recovery Delay 400mS Low Functional Supply Voltage 0.9V Small 3-Pin SOT-23 Package
Pin Configurations
Part Number RT9809(SOT-23)
1 2
Pin Configurations
TOP VIEW
3
CV
1. GND 2. RESET 3. VDD
Applications
Computers Controllers Intelligent Instruments Critical P and C Power Monitoring Portable/Battery-Powered Equipment
Typical Application Circuit
VDD P RESET RESET RT9809 GND VDD
Ordering Information
RT9809Package Type V : SOT-23 Operating temperature range C: Commercial standard Reset Threshold 15 : 1.5V 16 : 1.6V : 49 : 4.9V 50 : 5.0V
DS9809-00 June 2001
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RT9809
Pin Description
Pin Name GND RESET VDD Pin Function Ground Pin
Preliminary
Reset Pulse Output, Negative Pulse Power Pin
Function Block Diagram
VDD VDD P VSET CMP TIMER RESET
N
Threshold Voltage Setting
POR Power On Reset
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DS9809-00 June 2001
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Preliminary Absolute Maximum Ratings
Terminal Voltage (with Respect to GND) VDD All Other Inputs Input Current, VDD Output Current, RESET Power Dissipation, PD @ TA = 25C SOT-23 Operating Junction Temperature Range Storage Temperature Range Package Thermal Resistance SOT-23, JA Lead Temperature (Soldering, 5sec.)
RT9809
-0.3V to 6.0V -0.3V to VDD+0.3V 20mA 20mA 0.25W -40C ~ 125C -65C ~ 125C 250C /W 260C
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 RESET Output Voltage Note1: 1.5V ~ 5V, step 0.1V Symbol VDD IDD VTH VTH tRD tRP VOH VOL VDD = 1.5V ~ 5V, IOUT = 0 TA = 27C TA = 27C VDD = 5V, Drop = -20mV VDD = 1.5V, Drop = -20mV VDD 1.02xVTH VDD > VTH, ISOURCE > 1mA VDD < VTH, ISINK > 3.5mA Test Conditions Min 0.9 --------Typ -2.5 Note1 -25 5 400 0.8VDD 0.2VDD Max 6 --2 -----Units V A V % S mS V
DS9809-00 June 2001
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RT9809
Package Information
Preliminary
D
C
B
e
A b A1 L
H
Symbol A A1 B b C D e H L
Dimensions In Millimeters Min 0.889 -1.397 0.356 2.591 2.692 1.803 0.102 0.356 Max 1.295 0.152 1.803 0.508 2.997 3.099 2.007 0.254 0.610
Dimensions In Inches Min 0.035 -0.055 0.014 0.102 0.106 0.071 0.004 0.014 Max 0.051 0.006 0.071 0.020 0.118 0.122 0.079 0.010 0.024
SOT-23 Plastic Surface Mount
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DS9809-00 June 2001
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Preliminary
RT9809
DS9809-00 June 2001
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RT9809
Preliminary
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
www.richtek-ic.com.tw
DS9809-00 June 2001
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