General Description
The MIC811 and MIC812 are inexpensive
microprocessor supervisory circuits that monitor power
supplies in microprocessor based systems.
The function of this device is to assert a reset if either
the power supply drops below a designated reset
threshold level or /MR is forced low. Several different
reset threshold levels are available to accommodate
3V, 3.3V, or 5V powered systems.
The MIC811 has an active-low /RESET output, while
the MIC812 offers an active-high RESET output. The
reset output remains asserted for a minimum of 140 ms
after VCC has risen above the designed reset threshold
level. Having a push-pull output stage, the MIC811/812
do not require a pull-up resistor at the output. The
MIC811 and MIC812 come in a 4-lead SOT-143
package.
If a microprocessor voltage supervisor with an
open-drain output stage is needed, see MIC6315.

Features
• Precision Voltage Monitor for 3V, 3.3V, or 5V
Power Supplies
• /RESET Remains Valid with VCC as Low as 1V
• 5 μA Typical Supply Current
• 140 ms Minimum Reset Pulse Width Available
• Manual Reset Input
• Available in 4-Lead SOT-143 Package

Applications
• Portable Equipment
• Intelligent Instruments
• Critical Microprocessor Power Monitoring
• Printers/Computers
• Controllers