Part # LM809 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM809 LM810 3-Pin Microprocessor Reset Circuits

Part Details:

LM809/LM810 September 2002 LM809/LM8103-Pin Microprocessor Reset Circuits 3-Pin General Description Features The LM809/810 microprocessor supervisory circuits can be n Precise monitoring of 3V, 3.3V, and 5V supply voltages used to monitor the power supplies in microprocessor and n Superior upgrade to MAX809/810 Microprocessor digital systems. They provide a reset to the microprocessor n Fully specified over temperature during power-up, power-down and brown-out conditions. n 140ms min. Power-On Reset pulse width, 240ms typical The function of the LM809/810 is to monitor the V supply Active-low RESET Output (LM809) CC voltage, and assert a reset signal whenever this voltage Active-high RESET Output (LM810) declines below the factory-programmed reset threshold. The n Guaranteed RESET Output valid for V 1V CC reset signal remains asserted for 240ms after V rises CC n Low Supply Current, 15µA typ. above the threshold. The LM809 has an active-low RESET n Power supply transient immunity output, while the LM810 has an active-high RESET output. Seven standard reset voltage options are available, suitable Applications for monitoring 5V, 3.3V, and 3V supply voltages. n Microprocessor Systems With a low supply current of only 15µA, the LM809/810 are Reset n Computers ideal for use in portable equipment. The LM809/LM810 areavailable in the 3-pin SOT23 package and in the 6-Lead LLP n Controllers package. n Intelligent Instruments n Portable/Battery-Powered Equipment Circuits n Automotive Typical Application Circuit 10105701 Connection Diagrams 10105702 ( ) are for LM810 10105715 Top View See NS package Number LDB06A ( ) are for LM810

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LM809.pdf Datasheet