MIC1815 Micrel MIC1815
Microprocessor Reset Circuit General Description Features The MIC1815 is an inexpensive microprocessor supervisory
circuit that monitors power supplies in microprocessor based
systems.
The function of these devices is to assert a reset if the power
supply drops below a designated reset threshold level. Several
different reset threshold levels are available to accommodate
10% or 20% drop in 3.3V powered systems.
The MIC1815 has an active low /RESET output. The reset
output is guaranteed to remain asserted for a minimum of
100ms after VCChas risen above the designated reset threshold level. The MIC1815 comes in a 3-pin SOT-23 package. Precision voltage monitor for 10% or 20% drop in 3.3V
power supplies /RESET remains valid with VCC as low as 1V 5ВµA supply current 100ms minimum reset pulse width No external components required Available in 3-pin SOT-23 package Ordering Information Applications Portable equipment
Intelligent instruments
Critical microprocessor power monitoring
Printers/computers
Embedded controllers Part Number Marking Threshold
Voltage Operating Temp. Range Package Pb-Free MIC1815-10U ND 2.88V –40°C to +85°C SOT-23 No MIC1815-20U NE 2.55V –40°C to +85°C SOT-23 No MIC1815-10UY ND 2.88V –40°C to +85°C SOT-23 Yes MIC1815-20UY NE 2.55V –40°C to +85°C SOT-23 Yes Typical Application
VCC VCC VCC MIC1815 µP RESET RESET Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 474-1000 fax + 1 (408) 944-0970 http://www.micrel.com July 2005 1 MIC1815 MIC1815 Micrel Pin Configuration RESET 1 MIC1815 3 GND VCC 2 3-Lead SOT23 Pin Description
Pin Number Pin Name 1 /RESET MIC1815 Pin Function
/RESET goes low if VCC falls below the reset threshold and remains asserted for one reset timeout period (100ms min) after VCC exceeds the reset
threshold. 2 VCC Power supply input. 3 GND IC ground pin 2 July 2005 MIC1815 Micrel Absolute Maximum Ratings(Note 1) Operating Ratings(Note 2) Terminal Voltage (VCC) .–0.3V to +6V
Input Current (VCC). 20mA
Output Current (/RESET) . 20mA …