DESCRIPTION

The MAX809/MAX810 are single function microprocessor resets used to monitor supply voltages in microprocessor and other logic systems. They provide a reset signal to the microprocessor during power-up, power-down, and brownout conditions. The reset signal is asserted when the supply voltage drops below the preset threshold, and the signal is released a set time after the supply voltage has risen above the preset threshold.

The MAX809 has an active-LOW reset output while the MAX810 has an active-HIGH reset output.

The low supply current of typically 17 µA makes the MAX809/MAX810 ideal for use in portable, battery operated equipment. They are available in the 3-pin SOT23 and SC70 packages.

FEATURES

• Monitors 5.0 V, 3.3 V and 3 V supplies

• 140 ms min. reset delay time:

– Active-LOW RESET output (MAX809)

– Active-HIGH RESET output (MAX810)

• Power supply transient immunity

• Guaranteed reset valid for 1.1 V

• Available in small SOT23 and SC70 3-pin packages

• No external components needed

• Specified over full temperature range –40 °C to +105 °C