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PDF ETC8114 Data sheet ( Hoja de datos )
| Número de pieza | ETC8114 | |
| Descripción | Microprocessor Reset Circuits | |
| Fabricantes | Micrel | |
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MIC8114
MIC8114
Microprocessor Reset Circuit
Final Information
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 1.4V
• <15µA supply current
• 1100ms 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
Package
MIC8114TU
NV
–40°C to +85°C
4-lead SOT-143
Typical Application
VCC
VCC
MIC81 14
RESET
MR
VCC
µP
RESET
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
May 2003
1
MIC8114
1 page  
MIC8114
Applications Information
Microprocessor Reset
The /RESET pin is asserted whenever VCC falls below the
reset threshold voltage. The reset pin remains asserted for a
period of 790ms after VCC has risen above the reset threshold
voltage. The reset function ensures the microprocessor is
properly reset and powers up into a known condition after a
power failure. /RESET will remain valid with VCC as low as
1.4V.
VCC Transients
The MIC1815 is relatively immune to the negative-going VCC
glitches below the reset threshold. Typically, a negative-
going transient 125mV belt the reset threshold with a duration
of 50µs or less will not cause a reset.
Micrel
/RESET Valid at Low Voltage
A resistor can be added from the /RESET pin to ground to
ensure the /RESET output remains low with VCC down to 0V.
A 100kΩ resistor connected from /RESET to ground is
recommended. The resistor should be large enough not to
load the /RESET output and small enough to pull-down any
stray leakage currents
VCC
VCC
MIC81 14
RESET
VCC
µP
RESET
100K
/RESET Valid to VCC = 0V
May 2003
5
MIC8114
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet ETC8114.PDF ] | |
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