MIC811/MIC812
Microprocessor Reset Circuits
Features
General Description
• Precision Voltage Monitor for 3V, 3.3V, or 5V
Power Supplies
• /RESET Remains Valid with VCC as Low as 1V
• 5 µA Typical Supply Current
• 140 ms Minimum Reset Pulse Width Available
• Manual Reset Input
• Available in 4-Lead SOT-143 Package
The MIC811 and MIC812 are inexpensive
microprocessor supervisory circuits that monitor power
supplies in microprocessor based systems.
Applications
The MIC811 has an active-low /RESET output, while
the MIC812 offers an active-high RESET output. The
reset output remains asserted for a minimum of 140 ms
after VCC has risen above the designed reset threshold
level. Having a push-pull output stage, the MIC811/812
do not require a pull-up resistor at the output. The
MIC811 and MIC812 come in a 4-lead SOT-143
package.
•
•
•
•
•
Portable Equipment
Intelligent Instruments
Critical Microprocessor Power Monitoring
Printers/Computers
Controllers
The function of this device is to assert a reset if either
the power supply drops below a designated reset
threshold level or /MR is forced low. Several different
reset threshold levels are available to accommodate
3V, 3.3V, or 5V powered systems.
If a microprocessor voltage supervisor with an
open-drain output stage is needed, see MIC6315.
Package Types
MIC811
4-Lead SOT-143 (U)
(Top View)
2022 Microchip Technology Inc. and its subsidiaries
MIC812
4-Lead SOT-143 (U)
(Top View)
DS20006526A-page 1
MIC811/MIC812
Typical Application Circuit
Functional Block Diagram
DS20006526A-page 2
2022 Microchip Technology Inc. and its subsidiaries
MIC811/MIC812
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Terminal Voltage (VCC)............................................................................................................................. –0.3V to +6.0V
Input Current (VCC, /MR)........................................................................................................................................20 mA
Output Current (/RESET, RESET) ..........................................................................................................................20 mA
Rate of Rise (VCC) .............................................................................................................................................. 100V/µs
ESD Rating (Note 1) .................................................................................................................................................. 3 kV
Operating Ratings ‡
Power Dissipation (TA = +70°C)...........................................................................................................................320 mW
† Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at those or any other conditions above those indicated
in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended
periods may affect device reliability.
‡ Notice: The device is not guaranteed to function outside its operating rating.
Note 1: Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5 kΩ in series
with 100 pF.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics: For typical values, VCC = 5V for MIC81_L/M/J, VCC = 3.3V for MIC81_S/T, VCC = 3V for
MIC81_R; TA = +25°C, bold values indicate –40°C to ≤ TA ≤ +85°C; unless noted. (Note 1)
Parameter
Operating Voltage Range
Supply Current
Reset Voltage Threshold
Reset Timeout Period
/RESET Output Voltage
Note 1:
Symbol
Min.
Typ.
Max.
Units
VCC
1
—
5.5
V
—
5
15
—
5
10
—
5
10
4.50
4.63
4.75
MIC811L, MIC812L
4.25
4.38
4.50
MIC811M, MIC812M
3.89
4.00
4.10
3.00
3.08
3.15
2.85
2.93
3.00
MIC811S, MIC812S
2.55
2.63
2.70
MIC811R, MIC812R
140
240
560
VCC –
1.5V
—
—
0.8 x
VCC
—
—
IVCC
VTH
tRST
VOH
Conditions
TA = –40°C to +85°C
MIC811L/M/J, MIC812L/M/J: VCC =
5.0V, no load
µA
MIC811S/T, MIC812S/T: VCC = 3.3V,
no load
MIC811R, MIC812R: VCC = 3.0V, no
load
V
ms
V
MIC811J, MIC812J
MIC811T, MIC812T
—
ISOURCE = 800 μA, MIC811L/M/J
ISOURCE = 500 μA, MIC811R/S/T
Specification for packaged product only.
2022 Microchip Technology Inc. and its subsidiaries
DS20006526A-page 3
MIC811/MIC812
ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Characteristics: For typical values, VCC = 5V for MIC81_L/M/J, VCC = 3.3V for MIC81_S/T, VCC = 3V for
MIC81_R; TA = +25°C, bold values indicate –40°C to ≤ TA ≤ +85°C; unless noted. (Note 1)
Parameter
/RESET Output Voltage
Symbol
VOL
RESET Output Voltage
VOH
RESET Output Voltage
VOL
Min.
Typ.
Max.
—
—
0.4
—
—
0.3
—
—
0.3
0.8 x
VCC
—
—
—
—
0.4
—
—
0.3
Units
Conditions
VCC = VTH min., ISINK = 3.2 mA,
MIC811L/M/J
V
VCC = VTH min., ISINK = 1.2 mA,
MIC811R/S/T
VCC >1V, ISINK = 50 μA, TA = –40°C
to +85°C
V
V
1.8V < VCC < VTH min.,
ISOURCE = 150 μA
ISINK = 3.2 mA, MIC812L/M/J
ISINK = 1.2 mA, MIC812R/S/T
/MR Minimum Pulse Width
—
10
—
—
µs
—
/MR to Reset Delay
—
—
0.5
—
µs
—
2.3
—
—
/MR Input Threshold
VIH
V
0.7 x
VCC
—
—
—
—
0.8
—
—
0.25 x
VCC
V
VCC > VTH max., MIC81_L/M/J
MIC81_R/S/T
VCC > VTH max., MIC81_L/M/J
/MR Input Threshold
VIL
/MR Pull-Up Resistance
—
10
20
30
kΩ
—
/MR Glitch Immunity
—
—
100
—
ns
—
Note 1:
MIC81_R/S/T
Specification for packaged product only.
Reset Timing Diagram
DS20006526A-page 4
2022 Microchip Technology Inc. and its subsidiaries
MIC811/MIC812
TEMPERATURE SPECIFICATIONS
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
Operating Temperature Range
TA
–40
—
+85
°C
—
Storage Temperature Range
TS
+5
—
+150
°C
—
Lead Temperature
—
—
—
+300
°C
Soldering, 10 sec.
θJA
—
265
—
°C/W
Temperature Ranges
Package Thermal Resistance
Thermal Resistance, SOT-143, 4-Ld
Note 1:
—
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable
junction temperature and the thermal resistance from junction to air (i.e., TA, TJ, JA). Exceeding the
maximum allowable power dissipation will cause the device operating junction temperature to exceed the
maximum +85°C rating. Sustained junction temperatures above +85°C can impact the device reliability.
2022 Microchip Technology Inc. and its subsidiaries
DS20006526A-page 5
MIC811/MIC812
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin Number
MIC811
Pin Number
MIC812
Pin Name
1
1
GND
2
N/A
/RESET
/RESET goes low if VCC falls below the reset threshold and remains
asserted for one reset timeout period (140 ms min.) after VCC exceeds
the reset threshold.
N/A
2
RESET
RESET goes high if VCC falls below the reset threshold and remains
asserted for one reset timeout period (140 ms min.) after VCC exceeds
the reset threshold.
Description
IC Ground Pin.
3
3
/MR
Manual Reset Input. A logic low on /MR will force a reset. The reset
will remain asserted as long as /MR is held low and for one reset timeout period (140 ms min.) after /MR goes high. This input can be
shorted to ground via a switch or driven from CMOS or TTL logic.
Float if unused.
4
4
VCC
Power Supply Input.
DS20006526A-page 6
2022 Microchip Technology Inc. and its subsidiaries
MIC811/MIC812
3.0
APPLICATION INFORMATION
3.1
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 140 ms after VCC has
risen above the reset threshold voltage. The reset
function ensures that 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 1V.
3.2
3.4
/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 100 kΩ resistor connected from the
/RESET to ground is recommended. The value of the
resistor should be large enough not to load the output
excessively and small enough to pull-down any stray
leakage currents.
VCC Transients
The MIC811/812 are relatively immune to
negative-going VCC glitches below the reset threshold.
Typically, a negative-going transient 125 mV below the
reset threshold with a duration of 20 μs or less will not
cause a reset.
3.3
Interfacing to Bidirectional Reset
Pins
The MIC811/812 can interface with microprocessors
with bidirectional reset pins by connecting a 4.7 kΩ
resistor in series with the MIC811/812 output and the
microprocessor reset pin.
2022 Microchip Technology Inc. and its subsidiaries
Nȍ
FIGURE 3-1:
Reset Valid to VCC = 0V.
DS20006526A-page 7
MIC811/MIC812
4.0
PACKAGING INFORMATION
4.1
Package Marking Information
4-Lead SOT-143*
(Front)
XX
KM
4-Lead SOT-143*
(Back)
MNNN
Legend: XX...X
Y
YY
WW
NNN
e3
*
Example
Example
95H4
Product code or customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC® designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
●, ▲, ▼ Pin one index is identified by a dot, delta up, or delta down (triangle
mark).
Note:
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information. Package may or may not include
the corporate logo.
Underbar (_) and/or Overbar (‾) symbol may not be to scale.
TABLE 4-1:
MARKING CODES
Part Number
Marking Code
Threshold Voltage
MIC811LUY
KL
4.63V
MIC811MUY
KM
4.38V
MIC811JUY
KJ
4.00V
MIC811TUY
KT
3.08V
MIC811SUY
KS
2.93V
MIC811RUY
KR
2.63V
MIC812LUY
LL
4.63V
MIC812MUY
LM
4.38V
MIC812JUY
LJ
4.00V
MIC812TUY
LT
3.08V
MIC812SUY
LS
2.93V
MIC812RUY
LR
2.63V
DS20006526A-page 8
2022 Microchip Technology Inc. and its subsidiaries
MIC811/MIC812
4-Lead SOT-143 Package Outline and Recommended Land Pattern
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging.
2022 Microchip Technology Inc. and its subsidiaries
DS20006526A-page 9
MIC811/MIC812
NOTES:
DS20006526A-page 10
2022 Microchip Technology Inc. and its subsidiaries
MIC811/MIC812
APPENDIX A:
REVISION HISTORY
Revision A (May 2022)
• Converted Micrel document MIC811/MIC812 to
Microchip data sheet template DS20006526A.
• Minor grammatical text changes throughout.
2022 Microchip Technology Inc. and its subsidiaries
DS20006526A-page 11
MIC811/MIC812
NOTES:
DS20006526A-page 12
2022 Microchip Technology Inc. and its subsidiaries
MIC811/MIC812
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office.
Device
X
X
X
-XX
Part No.
Threshold
Voltage
Package
Temp. Range
Media Type
MIC811:
Device:
Microprocessor Reset Circuits with ActiveLow /RESET
Microprocessor Reset Circuits with ActiveHigh RESET
MIC812:
Threshold
Voltage:
R
S
T
J
M
L
=
=
=
=
=
=
2.63V
2.93V
3.08V
4.00V
4.38V
4.63V
Package:
U
=
4-Lead SOT-143
Temperature
Range:
Y
=
–40°C to +85°C
Media Type:
TR
=
3,000/Reel
Examples:
a) MIC811RUY-TR:
MIC811, 2.63V Threshold
Voltage, 4-Lead SOT-143,
–40°C to +85°C Temp.
Range, 3,000/Reel
b) MIC811JUY-TR:
MIC811, 4.00V Threshold
Voltage, 4-Lead SOT-143,
–40°C to +85°C Temp.
Range, 3,000/Reel
c) MIC811TUY-TR:
MIC811, 3.08V Threshold
Voltage, 4-Lead SOT-143,
–40°C to +85°C Temp.
Range, 3,000/Reel
d) MIC812SUY-TR:
MIC812, 2.93V Threshold
Voltage, 4-Lead SOT-143,
–40°C to +85°C Temp.
Range, 3,000/Reel
e) MIC812LUY-TR:
MIC812, 4.63V Threshold
Voltage, 4-Lead SOT-143,
–40°C to +85°C Temp.
Range, 3,000/Reel
f) MIC812MUY-TR:
MIC812, 4.38V Threshold
Voltage, 4-Lead SOT-143,
–40°C to +85°C Temp.
Range, 3,000/Reel
Note 1:
2022 Microchip Technology Inc. and its subsidiaries
Tape and Reel identifier only appears in the
catalog part number description. This identifier is
used for ordering purposes and is not printed on
the device package. Check with your Microchip
Sales Office for package availability with the
Tape and Reel option.
DS20006526A-page 13
MIC811/MIC812
NOTES:
DS20006526A-page 14
2022 Microchip Technology Inc. and its subsidiaries
Note the following details of the code protection feature on Microchip products:
•
Microchip products meet the specifications contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is secure when used in the intended manner, within operating specifications, and
under normal conditions.
•
Microchip values and aggressively protects its intellectual property rights. Attempts to breach the code protection features of
Microchip product is strictly prohibited and may violate the Digital Millennium Copyright Act.
•
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ISBN: 978-1-6683-0390-0
DS20006526A-page 15
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