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The RT9817 is a micro-power voltage detector with deglitched manual reset input supervising the power supply voltage level for microprocessors (μP) or digital systems. It provides internally fixed threshold levels with 0.1V per step ranging from 1.2V to 5V, which covers most digital applications. It features low supply current of 3μA. The RT9817 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 upcrossing the threshold level, the reset signal will be released after a certain delay time. To pull reset signal low manually, just pull the manual reset input (MR) below the specified VIL level. RT9817 is provided in SC-82 and SOT-143 packages.

Applications

  • Computers
  • Controllers
  • Intelligent Instruments
  • Critical μP and μC Power Monitoring
  • Portable/Battery-Powered Equipment
Key Spec.
RT9817A RT9817B RT9817C RT9817D
Status Active Active Active Active
Vin (min) (V) 0.9 0.9 0.9 0.9
Vin (max) (V) 6 6 6 6
VTH (min) (V) 1.2 1.2 1.2 1.2
VTH (max) (V) 5 5 5 5
Accuracy (±%) 1.5 1.5 1.5 1.5
Reset Active Type Low Low Low Low
Reset Time-out Period (typ) (ms) 0 55 220 450
Reset Delay Time (typ) (ms) 0.02 0.02 0.02 0.02
Package Type SOT-143;SC-82 SOT-143;SC-82 SOT-143;SC-82 SOT-143;SC-82
Features
  • Internally Fixed Threshold 1.2V to 5V in 0.1V Step
  • High Accuracy ±1.5%
  • Low Supply Current 3μA
  • No External Components Required
  • Quick Reset within 20μs
  • Built-in Recovery Delay Include 0ms, 55ms, 220ms, 450ms Options
  • Low Functional Supply Voltage 0.9V
  • CMOS Push-Pull Output
  • Small SC-82 and SOT-143 Packages
  • RoHS Compliant and 100% Lead (Pb)-Free
Datasheet
TitleLast UpdateDownload
Micro-Power Voltage Detectors with Manual Reset2008/10/28
Technical Documents
TitleItem TypeLast UpdateDownload
Richtek Product Selection Guide [Jan., 2024] Selection Guide2024/01/18
Please confirm with our distributor or sales representative for actual stock status.
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