RT9811

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
`􀁺 100nS Glitch Immunity of Manual Reset Input
`􀁺 Low Functional Supply Voltage 0.9V
`􀁺 Small 4-Pin SOT-25 Package


Application

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


Pinout




Specifications

`   Terminal Voltage (with Respect to GND)
      VDD....................... -0.3V to 6.0V
      All Other Inputs.............. -0.3V to VDD+0.3V
`   Input Current, VDD ...................20mA 
`   MR ............................1mA 
`   Output Current, RESET................. 20mA
`   Power Dissipation, PD @ TA = 25°C
      SOT-25 ......................... 0.25W
`   Operating Junction Temperature Range... -40°C ~ 125°C
`   Storage Temperature Range  ........ -65°C ~ 125°C
`   Package Thermal Resistance
      SOT-25, JA .....................250°C /W
`   Lead Temperature (Soldering, 5sec.).......... 260°C 


Description

The RT9811 is a micro-power voltage detector with de-glitched manual reset input 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 RT9811 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. To pull reset signal low manually, just pull the manual reset input (MR) below the specified V_IL level.

RT9811 is provided in SOT-25 package.