Document
MIC809/810
Microprocessor Reset Circuits
General Description
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 VCC 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 VCC as low as 1.4V for SOT-23 packaged part
• /RESET remains valid with VCC 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 3-Pin SC-70
Marking(2) Threshold Voltage (V) Operating Temperature Range
Lead Finish
MIC809LUY MIC809LYC3
IL
4.63
–40°C to +85°C
Pb-Free
MIC809MUY MIC809MYC3
IM
4.38
–40°C to +85°C
Pb-Free
MIC809JUY
MIC809JYC3
IJ
4.00
–40°C to +85°C
Pb-Free
MIC809TUY MIC809TYC3
IT
3.08
–40°C to +85°C
Pb-Free
MIC809SUY MIC809SYC3
IS
2.93
–40°C to +85°C
Pb-Free
MIC809RUY MIC809RYC3
IR
2.63
–40°C to +85°C
Pb-Free
MIC810LUY MIC810LYC3
JL
4.63
–40°C to +85°C
Pb-Free
MIC810MUY MIC810MYC3
JM
4.38
–40°C to +85°C
Pb-Free
MIC810JUY
MIC810JYC3
JJ
4.00
–40°C to +85°C
Pb-Free
MIC810TUY MIC810TYC3
JT
3.08
–40°C to +85°C
Pb-Free
MIC810SUY MIC810SYC3
JS
2.93
–40°C to +85°C
Pb-Free
MIC810RUY MIC810RYC3
JR
2.63
–40°C to +85°C
Pb-Free
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.
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
Pin Number MIC810
1
2 N/A
N/A 2 33
Pin Name Pin Name
GND /RESET
RESET VCC
IC Ground Pin.
/RESET goes low if VCC falls below the reset threshold and remains asserted for one reset timeout period (140ms min.) after VCC exceeds the reset threshold.
RESET goes high if VCC falls below the reset threshold and remains asserted for one reset timeout period (140ms, minimum) after VCC exceeds the reset threshold.
Power Supply Input.
Part Numbering Conventions
MIC809 SOT-23
July 6, 2015
MIC809 SC-70 3
Revision 3.0
Micrel, Inc.
MIC809/810
Absolute Maximum Ratings(3)
Terminal Voltage (VCC)................................. –0.3V to +6.0V Input Current (VCC) ......................................................20mA Output Current (/RESET, RESET) ..............................20mA Lead Temperature (soldering, 10s)............................ 300°C Storage Temperature (TS)........................... –65°C to 150°C Rate-of-Rise (VCC) ................................................... 100V/μs ESD Rating(5).................................................... 3kV (SC-70)
Operating Ratings(4)
Operating Temperature Range MIC809 ................................................. –40°C to +85°C MIC810 ................................................. –40°C to +85°C
Power Dissipation (TA = +70°C)...............................320mW
Electrical Characteristics(6)
For typical values, VCC = 5V for MIC8_L/M/J, VCC = 3.3V for MIC8_S/T, VCC = 3V for MIC8_R; TA = 25°C. Bold values indicate –40°C to ≤ TA ≤ +85°C; unless otherwise noted.
Symbol Parameter VCC Operating Voltage Range
Condition TA = 0°C to 70°C (SOT-23) TA = –40°C to 85°C (SOT-23) TA = –40°C to 85°C (SC70) MIC809L/M/J, MIC810L/M/J (SOT-23)
Min. 1.4 1.6 1
Typ. 9
MIC809L/M/J, MIC810L/M/J (SC-70)
5
ICC Supply Current
VCC <3.6V, MIC809R/S/T, MIC810R/S/T (SOT-23)
6
VCC <3.6V, MIC809R/S/T, MIC810R/S/T (SC-70)
5
MIC809L, MIC810L MIC809M, MIC810M
4.50 4.63 4.25 4.38
VTH Rese.