The MIC809 and MIC810 are inexpensive microprocessor
supervisory circuits that monitor 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 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 V
CC
has risen above the designated reset
threshold level. Having a push-pull output stage, the
MIC809/810 does not require a pull-up resistor at the
output. The MIC809/810 comes in a 3-pin SOT-23 and
SC-70 package.
The MIC809 is also available with a shorter reset timeout
(30ms, minimum).
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 V
CC
as low as 1.4V for
SOT-23 packaged part
•
/RESET remains valid with V
CC
as low as 1V for
SC70-packaged part
•
Typically less than 15μA supply current for SOT-23
packaged part
•
5µA (typical) supply current for SC70-packaged part
•
140ms (minimum) reset pulse widths available
•
Available in 3-pin SOT-23 and SC-70 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
July 6, 2015
Revision 3.0
Micrel, Inc.
MIC809/810
Ordering Information
(1)
Part Number
3-Pin SOT-23
MIC809LUY
MIC809MUY
MIC809JUY
MIC809TUY
MIC809SUY
MIC809RUY
MIC810LUY
MIC810MUY
MIC810JUY
MIC810TUY
MIC810SUY
MIC810RUY
Note:
1. All devices available in Tape and Reel only (Order entry PN, add TR, i.e., MIC809LUY TR). Standard/full reel quantity is 3,000 pieces. Reel diameter
is 7in, hub diameter is 2in, and width is 8mm.
2. Underbar symbol (__) may not be to scale.
3-Pin SC-70
MIC809LYC3
MIC809MYC3
MIC809JYC3
MIC809TYC3
MIC809SYC3
MIC809RYC3
MIC810LYC3
MIC810MYC3
MIC810JYC3
MIC810TYC3
MIC810SYC3
MIC810RYC3
Marking
IL
IM
IJ
IT
IS
IR
JL
JM
JJ
JT
JS
JR
(2)
Threshold Voltage (V)
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 Temperature 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
Lead Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pin Configuration
3-Pin MIC809 SOT-23
3-Pin MIC809 SC-70
(Top View)
3-Pin MIC810 SOT-23
3-Pin MIC810 SC-70
(Top View)
July 6, 2015
2
Revision 3.0
Micrel, Inc.
MIC809/810
Pin Description
Pin Number
MIC809
1
2
Pin Number
MIC810
1
N/A
Pin Name
GND
/RESET
Pin Name
IC Ground Pin.
/RESET goes low if V
CC
falls below the reset threshold and remains asserted
for one reset timeout period (140ms min.) after V
CC
exceeds the reset
threshold.
RESET goes high if V
CC
falls below the reset threshold and remains asserted
for one reset timeout period (140ms, minimum) after V
CC
exceeds the reset
threshold.
Power Supply Input.
N/A
3
2
3
RESET
VCC
Part Numbering Conventions
MIC809 SOT-23
MIC809 SC-70
July 6, 2015
3
Revision 3.0
Micrel, Inc.
MIC809/810
Absolute Maximum Ratings
(3)
Terminal Voltage (V
CC
) ................................. –0.3V to +6.0V
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