The SP809/SP810 are low power microprocessor (P) supervisory circuits used to monitor power supplies in P and digital systems. They provide applications with benefits of circuit reliability and low cost by eliminating external components. If the VCC supply voltage falls below preset threshold then a reset signal is asserted for at least 140ms after VCC has risen above the reset threshold. Both the SP809 and SP810 were designed with a reset comparator to help identify invalid signals, which last less than 140ms. The only difference between them is that they have an active-low RESET output and active-high RESET output, respectively. Low supply current (1A) makes SP809/SP810 ideal for portable equipment. The devices are available in 3 pin SOT-23 package.