器件名称: LM809
功能描述: 3-Pin Microprocessor Reset Circuits
文件大小: 184.34KB 共8页
简 介:LM809/LM810 3-Pin Microprocessor Reset Circuits
September 2002
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 output. Seven standard reset voltage options are available, suitable for monitoring 5V, 3.3V, and 3V supply voltages. With a low supply current of only 15A, the LM809/810 are ideal for use in portable equipment. The LM809/LM810 are available in the 3-pin SOT23 package and in the 6-Lead LLP package.
Features
Precise monitoring of 3V, 3.3V, and 5V supply voltages Superior upgrade to MAX809/810 Fully specified over temperature 140ms min. Power-On Reset pulse width, 240ms typical Active-low RESET Output (LM809) Active-high RESET Output (LM810) n Guaranteed RESET Output valid for VCC≥1V n Low Supply Current, 15A typ. n Power supply transient immunity n n n n
Applications
n n n n n n Microprocessor Systems Computers Controllers Intelligent Instruments Portable/Battery-Powered Equipment Automotive
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