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PDF MIC1815 Data sheet ( Hoja de datos )
| Número de pieza | MIC1815 | |
| Descripción | Microprocessor Reset Circuit | |
| Fabricantes | Micrel Semiconductor | |
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MIC1815
MIC1815
Microprocessor Reset Circuit
Micrel
General Description
The MIC1815 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
10% or 20% drop in 3.3V powered systems.
The MIC1815 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 MIC1815 comes in a 3-pin SOT-23 package.
Features
• Precision voltage monitor for 10% or 20% drop in 3.3V
power supplies
• /RESET remains valid with VCC as low as 1V
• 5µA supply current
• 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
MIC1815-10U
MIC1815-20U
MIC1815-10UY
MIC1815-20UY
Marking
ND
NE
ND
NE
Threshold
Voltage
2.88V
2.55V
2.88V
2.55V
Operating Temp. Range
–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
Pb-Free
No
No
Yes
Yes
Typical Application
VCC
VCC
MIC1815
RESET
VCC
µP
RESET
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 474-1000 • fax + 1 (408) 944-0970 • http://www.micrel.com
July 2005
1
MIC1815
1 page  
MIC1815
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 MIC1815 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
MIC1815
RESET
VCC
µP
100K
RESET
/RESET Valid to VCC = 0V
July 2005
5
MIC1815
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet MIC1815.PDF ] | |
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