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The RT9819 is a micro-power voltage detector 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 RT9819 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. The RT9819 is provided in SC-70-3, SC-82, SOT-23-3 and WDFN-6L 1.6x1.6 packages.

Applications

  • Computers
  • Controllers
  • Intelligent Instruments
  • Critical μP and μC Power Monitoring
  • Portable/Battery-Powered Equipment
Key Spec.
RT9819A RT9819B RT9819C RT9819D RT9819E RT9819F RT9819G
Status Active Active Active Active Active Active Active
Vin (min) (V) 0.9 0.9 0.9 0.9 0.9 0.9 0.9
Vin (max) (V) 6 6 6 6 6 6 6
VTH (min) (V) 1.2 1.2 1.2 1.2 1.2 1.2 1.2
VTH (max) (V) 5 5 5 5 5 5 5
Accuracy (±%) 1.5 1.5 1.5 1.5 1.5 1.5 1.5
Reset Active Type Low Low Low Low High High High
Reset Time-out Period (typ) (ms) 0 55 220 450 0 55 220
Reset Delay Time (typ) (ms) 0.02 0.02 0.02 0.02 0.02 0.02 0.02
Package Type SOT-23;WDFN1.6x1.6-6;SC-70-3;SC-82 SOT-23;WDFN1.6x1.6-6;SC-70-3;SC-82 SOT-23;WDFN1.6x1.6-6;SC-70-3;SC-82 SOT-23;WDFN1.6x1.6-6;SC-70-3;SC-82 SOT-23;WDFN1.6x1.6-6;SC-70-3;SC-82 SOT-23;WDFN1.6x1.6-6;SC-70-3;SC-82 SOT-23;WDFN1.6x1.6-6;SC-70-3;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-70-3, SC-82, SOT-23-3 and WDFN-6L 1.6x1.6 Packages
  • RoHS Compliant and Halogen Free
Datasheet
TitleVersionLast UpdateDownload
RT9819: Micro-Power Voltage DetectorsV8.02013/10/01
Technical Documents
TitleItem TypeLast UpdateDownload
Richtek Product Selection Guide [Jan., 2024] Selection Guide2024/01/18
Part NumberPackage TypePackage Qty.Free SampleDistributorStockBuy From Authorized Distributor
RT9819B-26GVSOT-233,000 Request Digikey 2,800 Buy
Mouser 3,000 Buy
RT9819C-29GVSOT-233,000 Request Digikey 1,410 Buy
Mouser 3,000 Buy
RT9819C-30GVSOT-233,000 Request Digikey 1,563 Buy
Mouser 3,000 Buy
Please confirm with our distributor or sales representative for actual stock status.
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