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PDF MIC1810 Data sheet ( Hoja de datos )
| Número de pieza | MIC1810 | |
| Descripción | Microprocessor Reset Circuit | |
| Fabricantes | Micrel Semiconductor | |
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MIC1810
MIC1810
Microprocessor Reset Circuit
Micrel
General Description
The MIC1810 is an inexpensive microprocessor supervisory
circuit that monitors power supplies in microprocessor based
systems.
The function of these devices is to assert a reset if the power
supply drops below a designated reset threshold level. Several
different reset threshold levels are available to accommodate
5%, 10%, or 15% drop in 5V powered systems.
The MIC1810 has an active low /RESET output. The reset
output is guaranteed to remain asserted for a minimum of
100ms after VCChas risen above the designated reset thresh-
old level. The MIC1810 comes in a 3-pin SOT-23 package.
Features
• Precision voltage monitor for 5%, 10%, or 15% drop in
5V power supplies
• /RESET remains valid with VCC as low as 1V
• 5µA supply current (typical)
• 100ms minimum reset pulse width
• No external components required
• Available in 3-pin SOT-23 package
Applications
• Portable equipment
• Intelligent instruments
• Critical microprocessor power monitoring
• Printers/computers
• Embedded controllers
Ordering Information
Part Number
MIC1810-5U
MIC1810-10U
MIC1810-15U
MIC1810-5UY
MIC1810-10UY
MIC1810-15UY
Marking*
NA
NB
NC
NA
NB
NC
Threshold
Voltage
4.62V
4.37V
4.12V
4.62V
4.37V
4.12V
* Underbar symbol may not be to scale
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
Package
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
Pb-Free
No
No
No
Yes
Yes
Yes
Typical Application
VCC
VCC
MIC1810
RESET
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
MIC1810
1 page  
MIC1810
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 tRST 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 1V.
VCC Transients
The MIC1810 is 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 an unwanted 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. See Figure below.
VCC
VCC
MIC1810
RESET
VCC
µP
100K
RESET
/RESET Valid to VCC = 0V
July 2005
5
MIC1810
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet MIC1810.PDF ] | |
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