Microprocessor Reset Circuit
Description
MIC8114
MIC8114
Microprocessor Reset Circuit
Micrel
General Description
The MIC8114 is an inexpensive microprocessor supervisory circuit that monitors the power supply in microprocessor based systems.
The function of this device is to assert a reset if the power supply drops below a designated reset threshold level or /MR is forced low.
The MIC8114 has an active low /RESET output.
The reset output is guaranteed to remain asserted for a minimum of 790ms after VCC has risen above the designated reset threshold level.
The MIC1814 comes in a 4-pin SOT-143 package.
Features
• Precision voltage monitor for 3.
3V power supplies • Specifically tailored to the AMD Elan SC400/410 • /RESET remains valid with VCC as low as 1V • 5µA typical supply current • 790ms minimum reset pulse width • Manual reset input • Available in 4-Pin SOT-143 Package
Applications
• Portable equipment • Intelligent instruments • Critical microprocessor power monitoring • Printers/computers • Embedded controllers
Ordering Information
Part Number Marking Operating Temp.
Range
MIC8114TU
NV
–40°C to +85°C
MIC8114TUY
NV
–40°C to +85°C
Package 4-lead SOT-143 4-lead SOT-143
Pb-Free No Yes
Typical Application
VCC
VCC
MIC81 14
RESET MR
VCC µP
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
MIC8114
MIC8114
Pin Configuration
GND 1
4 VCC
MIC81 14
RESET 2
3 MR
4-Lead SOT-143
Micrel
Pin Description
Pin Number 1 2
3
4
Pin Name GND
/RESET
/MR
VCC
Pin Function
IC Ground Pin
/RESET goes low if either VCC falls below the supply reset threshold voltage or if /MR is asserted.
/RESET remains asserted for one reset timeout period after both VCC exceeds the supply reset threshold voltage and /MR is deasserted.
Manual Reset Input.
A logic low on /MR forces a reset.
The reset will remain asserted as long as /MR is held low and for one reset timeout period after /MR goes high.
This input can be ...
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