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LM809

Part Number	LM809
Manufacturer	National Semiconductor
Description	3-Pin Microprocessor Reset Circuits
Published	Mar 22, 2005
Detailed Description	LM809/LM810 3-Pin Microprocessor Reset Circuits September 1999 LM809/LM810 3-Pin Microprocessor Reset Circuits General...
Datasheet	LM809 PDF File

Overview

LM809/LM810 3-Pin Microprocessor Reset Circuits September 1999 LM809/LM810 3-Pin Microprocessor Reset Circuits General Description The LM809/810 microprocessor supervisory circuits can be used to monitor the power supplies in microprocessor and digital systems.
They provide a reset to the microprocessor during power-up, power-down and brown-out conditions.
The function of the LM809/810 is to monitor the VCC supply voltage, and assert a reset signal whenever this voltage declines below the factory-programmed reset threshold.
The reset signal remains asserted for 240ms after VCC rises above the threshold.
The LM809 has an active-low RESET output, while the LM810 has an active-high RESET outp...

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