3-pin microprocessor resets
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
• 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
• Embedded controllers
• Battery operated systems
• Wireless communication systems
• PDAs and handheld equipment
SIMPLIFIED SYSTEM DIAGRAMS
Figure 1. MAX809 simplified system diagram.
Figure 2. MAX810 simplified system diagram.
2003 Aug 08