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PDF ETC810 Data sheet ( Hoja de datos )
| Número de pieza | ETC810 | |
| Descripción | Microprocessor Reset Circuits | |
| Fabricantes | Micrel | |
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MIC809/810
MIC809/810
Microprocessor Reset Circuits
Final Information
Micrel
General Description
The MIC809 and MIC810 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.
Several different reset threshold levels are available to ac-
commodate 3V, 3.3V or 5V powered systems.
The MIC809 has an active low /RESET output, while the
MIC810 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 designated reset threshold
level. The MIC809/810 comes in a 3-pin SOT-23 package.
The MIC809 is also available with a shorter reset timeout
(30ms min.). See the MIC809-5.
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
• 20ms, 40ms, or 1100ms minimum reset pulse widths
available
• Manual reset input
• Available in 3-pin SOT-23 package
Applications
• Portable equipment
• Intelligent instruments
• Critical microprocessor power monitoring
• Printers/computers
• Controllers
Typical Application
Ordering Information
Part Number
MIC809LU
MIC809MU
MIC809JU
MIC809TU
MIC809SU
MIC809RU
MIC810LU
MIC810MU
MIC810JU
MIC810TU
MIC810SU
MIC810RU
Marking
IL
IM
IJ
IT
IS
IR
JL
JM
JJ
JT
JS
JR
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
3-lead SOT-23
3-lead SOT-23
3-lead SOT-23
3-lead SOT-23
3-lead SOT-23
3-lead SOT-23
3-lead SOT-23
3-lead SOT-23
3-lead SOT-23
3-lead SOT-23
3-lead SOT-23
3-lead SOT-23
8++
8++
MIC809
4-5-6
8++
µP
4-5-6
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 MIC809/810
1 page  
MIC809/810
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 MIC809/810 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.
Micrel
Interfacing to Bidirectional Reset Pins
The MIC809/810 can interface with µPs with bidirectional
reset pins by connecting a 4.7kΩ resistor in series with the
MIC809/810 output and the µP reset pin.
/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 resistor should be small enough to pull-
down any stray leakage currents and large enough not to load
the reset output . See Figure below.
VCC
VCC
MIC809
RESET
VCC
µP
RESET
100K
Reset Valid to VCC = 0V
May 2003
5 MIC809/810
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet ETC810.PDF ] | |
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