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PDF ETC811 Data sheet ( Hoja de datos )
| Número de pieza | ETC811 | |
| Descripción | (ETC812) Microprocessor Reset Circuits | |
| Fabricantes | Micrel | |
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MIC811/812
MIC811/812
Microprocessor Reset Circuits
Final Information
Micrel
General Description
The MIC811 and MIC812 are inexpensive microprocessor
supervisory circuit that monitors power supplies in micropro-
cessor 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.
The MIC811/812 comes in a 4-pin SOT-143 package.
Features
• Precision voltage monitor for 3V, 3.3V or 5V power
supplies
• /RESET remains valid with VCC as low as 1.4V
• <15µA 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
• Embedded controllers
Ordering Information
Part Number
MIC811LU
MIC811MU
MIC811JU
MIC811TU
MIC811SU
MIC811RU
MIC812LU
MIC812MU
MIC812JU
MIC812TU
MIC812SU
MIC812RU
Marking
KL
KM
KJ
KT
KS
KR
LL
LM
LJ
LT
LS
LR
Threshold
Voltage
4.63
4.38
4.00
3.08
2.93
2.63
4.63
4.38
4.00
3.08
2.93
2.63
Operating
Temp. Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
Typical Application
VCC
VCC
MIC81 1
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 MIC811/812
1 page  
MIC811/812
Applications 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 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 1.4V.
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 50µs (25µs for MIC8_R/S/T) 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.
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 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.
VCC
VCC
MIC81 1
RESET
VCC
µP
RESET
100K
Reset Valid to VCC = 0V
May 2003
5 MIC811/812
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet ETC811.PDF ] | |
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