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PDF MIC812 Data sheet ( Hoja de datos )
| Número de pieza | MIC812 | |
| Descripción | Microprocessor Reset Circuits | |
| Fabricantes | Micrel Semiconductor | |
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Hay una vista previa y un enlace de descarga de MIC812 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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MIC811/812
Microprocessor Reset Circuits
General Description
The MIC811 and MIC812 are inexpensive microprocessor
supervisory circuits that monitor power supplies in
microprocessor based systems.
The function of this device is to assert a reset if either the
power supply drops below a designated reset threshold
level or /MR is forced low. Several different reset threshold
levels are available to accommodate 3V, 3.3V or 5V
powered systems.
The MIC811 has an active low /RESET output, while the
MIC812 offers an active high RESET output. The reset
output is guaranteed to remain asserted for a minimum of
140ms after VCC has risen above the designed reset
threshold level. Having a push-pull output stage, the
MIC811/812 does not require a pull-up resistor at the
output. The MIC811/812 comes in a 4-pin SOT-143
package.
If a microprocessor voltage supervisor with an open-drain
output stage is needed, see MIC6315.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Features
• Precision voltage monitor for 3V, 3.3V or 5V power
supplies
• /RESET remains valid with VCC as low as 1V
• 5μA typical supply current
• 140ms minimum reset pulse width available
• Manual reset input
• Available in 4-pin SOT-143 package
Applications
• Portable equipment
• Intelligent instruments
• Critical microprocessor power monitoring
• Printers/computers
• Controllers
Typical Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
September 9, 2014
Revision 2.0
1 page  
Micrel, Inc.
Application Information
Microprocessor Reset
The /RESET (or RESET) pin is asserted whenever VCC
falls below the reset threshold voltage. The /RESET pin
remains asserted for a period of 140ms after VCC has
risen above the reset threshold voltage. The reset
function ensures that the microprocessor is properly reset
and powers up in a known condition after a power failure.
/RESET will remain valid with VCC as low as 1V.
VCC Transients
The MIC811/812 are relatively immune to negative-going
VCC glitches below the reset threshold. Typically, a
negative-going transient 125mV below the reset
threshold with a duration of 20μs or less will not cause a
reset.
Interfacing to Bidirectional Reset Pins
The MIC811/812 can interface with µPs with bidirectional
reset pins by connecting a 4.7kΩ resistor in series with
the MIC811/812 output and the µP reset pin.
MIC811/812
/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 the /RESET to
ground is recommended. The size of the resistor should
be large enough not to load the output excessively and
small enough to pull-down any stray leakage currents.
Reset Valid to VCC = 0V
September 9, 2014
5
Revision 2.0
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet MIC812.PDF ] | |
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