LM809M3-4.63/NOPB

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 voltage, and assert a reset signal whenever this voltage declines below the factoryprogrammed reset threshold. The reset signal remains asserted for 240 ms 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 5-V, 3.3-V, and 3-V supply voltages. With a low supply current of only 15 μA, the LM809 and LM810 are ideal for use in portable equipment.

Applications

• Factory Automation
• Building Automation
• Programmable Logic Control
• Renewable Energy
• Microprocessor Systems
• Computers
• Controllers
• Intelligent Instruments
• Portable/Battery-Powered Equipment
• Automotive

Key features

• 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
• Active-Low RESET Output (LM809)
• Active-High RESET Output (LM810)
• Ensured RESET Output Valid for VCC ≥ 1 V
• Low Supply Current, 15-μA Typical
• Power Supply Transient Immunity