MIC1810 Micrel MIC1810
Microprocessor Reset Circuit General Description Features The MIC1810 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
5%, 10%, or 15% drop in 5V powered systems.
The MIC1810 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 MIC1810 comes in a 3-pin SOT-23 package. Precision voltage monitor for 5%, 10%, or 15% drop in
5V power supplies /RESET remains valid with VCC as low as 1V 5ВµA supply current (typical) 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 Marking* Threshold
Voltage Operating Temp. Range Package Pb-Free MIC1810-5U NA 4.62V –40°C to +85°C SOT-23 No MIC1810-10U NB 4.37V –40°C to +85°C SOT-23 No MIC1810-15U NC 4.12V –40°C to +85°C SOT-23 No MIC1810-5UY NA 4.62V –40°C to +85°C SOT-23 Yes Part Number MIC1810-10UY NB 4.37V –40°C to +85°C SOT-23 Yes MIC1810-15UY NC 4.12V –40°C to +85°C SOT-23 Yes * Underbar symbol may not be to scale Typical Application VCC VCC VCC MIC1810 µP RESET RESET Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 http://www.micrel.com July 2005 1 MIC1810 MIC1810 Micrel Pin Configuration RESET 1 MIC1810 3 GND VCC 2 3-Lead SOT-23 Pin Description
Pin Number Pin Name 1 /RESET MIC1810 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 MIC1810 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
Rate of Rise (VCC) . 100V/Вµs …
