RT9819

Features:

` Internally Fixed Threshold 1.2V to 5V in 0.1V Step
` High Accuracy ±1.5%
` Low Supply Current 3A
` No External Components Required
` Quick Reset within 20s
` 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 and SOT-23-3 Packages
` RoHS Compliant and 100% Lead (Pb)-Free




Application

` Computers
` Controllers
`Intelligent Instruments
` Critical P and C Power Monitoring
` Portable/Battery-Powered Equipment




Pinout






Specifications

`Terminal Voltage (with Respect to GND)
V<sub>DD</sub> ------------------------------------------------------------------------------------------------------−0.3V to 6.0V
`All Other Inputs -------------------------------------------------------------------------------- −0.3V to V_DD+0.3V
`Input Current, I<sub>VDD</sub> -------------------------------------------------------------------------------------------- 20mA
`Power Dissipation, PD @ T_A = 25°C
SC-70-3/SC-82 ------------------------------------------------------------------------------------------------- 0.25W
SOT-23-3 ---------------------------------------------------------------------------------------------------------- 0.4W
`Package Thermal Resistance (Note 4)
SC-70-3/SC-82, <sub>JA</sub> --------------------------------------------------------------------------------------- 400°C /W
SOT-23-3, <sub>JA</sub> ---------------------------------------------------------------------------------------------- 250°C /W
`Lead Temperature (Soldering, 10sec.)--------------------------------------------------------------------- 260°C
`Storage Temperature Range ------------------------------------------------------------------- −65°C to 125°C
`ESD Susceptibility (Note 2)
HBM (Human Body Mode) ----------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ---------------------------------------------------------------------------------------------- 200V




Description

The RT9819 is a micro-power voltage detector supervising the power supply voltage level for microprocessors (mP) 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 3mA. The RT9819 performs supervisory function by sending out a reset signal whenever the V_DD voltage falls below a preset threshold level. This reset signal will last the whole period before V_DD recovering. Once V_DD recovered upcrossing the threshold level, the reset signal will be released after a certain delay time. RT9819 is provided in SC-70-3, SC-82 and SOT-23-3 packages.