SNIS154C – JANUARY 2011 – REVISED APRIL 2013
SM72240 SolarMagic 5-Pin Microprocessor Reset Circuit
Check for Samples: SM72240
•2 Renewable Energy Grade
• Precise monitoring of 5V supply voltages
• Fully specified over temperature
– −40°C to +125°C
• 100 ms minimum Power-On Reset pulse width,
190 ms typical:
– Active-Low RESET Open Drain Output
• RESET Output valid for VCC ≥ 1V
• Low Supply Current, 6µA typical
• Power supply transient immunity
• Compatible with MAX811/812 applications
• Microprocessor Systems
• Intelligent Instruments
• Portable/Battery-Powered Equipment
The SM72240 microprocessor supervisory circuit
monitors the power supplies in microprocessor and
digital systems. It provides a reset to the
microprocessor during power-up, power-down,
brown-out conditions, and manual reset.
The SM72240 asserts a reset signal whenever the
supply decreases below the factory-programmed
reset threshold. Reset will be asserted for at least
100ms even after VCC rises above the reset
The SM72240 has an active-low open-drain RESET
The SM72240 is suitable for monitoring 5V. With a
low supply current of only 6µA, the SM72240 is ideal
for use in portable equipment. The SM72240 is
available in the 5-pin SOT-23 package.
Typical Application Circuit
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011–2013, Texas Instruments Incorporated