LM809 Datasheet - Texas Instruments

LM809 3-Pin Microprocessor Reset Circuits

The LM809 and LM810 microprocessors 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, powerdown and brown-out conditions. The function of the LM809 and LM810 are to monitor the VCC supply .

LM809 Features

* 1 Precision Monitoring of Supply Voltages

* Available Threshold Options: 2.63 V, 2.93 V, 3.08 V, 4.38 V, 4.63 V

* Superior Upgrade to MAX809 and MAX810

* Fully Specified Over Temperature

* 140-ms Minimum Power-On Reset Pulse Width, 240-ms Typical

* Ac

LM809-etcTI.pdf