LM810 Datasheet | National Semiconductor

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. Six standard reset voltage options are available, suitable for monitoring 5V, 3.3V, and 3V supply voltages. With a low supply current of only 15µA, the LM809/810 are ideal for use in portable equipment. The LM809/LM810 are available in the 3-pin SOT23 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, 15µA typ. n Power supply transient immunity n n n n Applications n n n n n n Microprocessor Systems puters Controllers Intelligent Instruments Portable/Battery-Powered Equipment Automotive Typical Application Circuit Connection Diagram DS101057-2 ( ) are for LM810 DS101057-1 © 1999 National Semiconductor Corporation DS101057 .national. Ordering Information Reset Threshold (V) 4.63 4.38 4.00 3.08 2.93 2.63 Reset Threshold (V) 4.63 4.38 4.00 3.08 2.93 2.63 LM809 Supplied as 1000 units, tape & reel LM809M3-4.63 LM809M3-4.38 LM809M3-4.00 LM809M3-3.08 LM809M3-2.93 LM809M3-2.63 LM810 Supplied as 1000 units, tape & reel LM810M3-4.63 LM810M3-4.38 LM810M3-4.00 LM810M3-3.08 LM810M3-2.93 LM810M3-2.63 LM809 Supplied as 3000 units, tape & reel LM809M3X-4.63 LM809M3X-4.38 LM809M3X-4.00 LM809M3X-3.08 LM809M3X-2.93 LM809M3X-2.63 LM810...