MIC803
3-Pin Microprocessor Supervisor Circuit
with Open-Drain Reset Output
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August 3, 2015
Revision 1.2
General Description
The MIC803 is a single-voltage s upervisor wit h open-drain
reset output that provides accurate power supply
monitoring and reset generation in microprocessor-based
systems. The function of the device is to assert a reset
signal if the power supply voltage drops below the reset
threshold voltage, and retain this reset for the reset
timeout per iod once th e power suppl y increases above the
reset threshold voltage.
The MIC803 consumes only 4.5µA of supply current and
offers three reset delay periods of 20ms, 140ms, and
1120ms (minimum). It features factory-programmed reset
threshold levels from 2.63V to 4.63V to accommodate
3.0V, 3.3V, and 5.0V power supplies. It is available in the
compact 3-pin SC-70 and SOT-23 packages.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Features
• 4.5μA supply current (typical) at 3.6V
• Open-drain /RESET output
• /RESET remains valid with VCC as lo w as 1V
• 20ms, 140ms, or 1120ms (minimum) reset timeout
options
• 2.63V to 4.63V preset voltage threshold options
• 2.5% voltage threshold accuracy over temperature
• 3-pin SC70-3 package (2.0mm × 2.1mm)
• 3-pin SOT-23 package (2.3mm × 2.9mm)
• -40˚C to +125˚C junction temperature range
Applications
• Critical microcomputer power monitoring
• Portable equipment
• Solid state drives
• Printers/computers
• Embedded controllers
Typical Application
VCC 100k
VCC
RESET
VCC
µPMIC803
GND GND
RESET
Micrel, Inc.
MIC803
August 3, 2015
2 Revision 1.2
Ordering Information(1)
Part Number Marking(2) Nominal
VTH (V) Minimum
tRESET(3) (ms) Junction Temperature Range Package
MIC803-46D2VC3 AS 4.63 20 –40° to +125°C SC70-3
MIC803-44D2VC3 AP 4.38 20 –40° to +125°C SC70-3
MIC803-41D2VC3 AK 4.10 20 –40° to +125°C SC70-3
MIC803-40D2VC3 A2 4.00 20 –40° to +125°C SC70-3
MIC803-31D2VC3 AG 3.08 20 –40° to +125°C SC70-3
MIC803-30D2VC3 AV 3.00 20 –40° to +125°C SC70-3
MIC803-29D2VC3 AD 2.93 20 –40° to +125°C SC70-3
MIC803-26D2VC3 AA 2.63 20 –40° to +125°C SC70-3
MIC803-46D3VC3 AT 4.63 140 –40° to +125°C SC70-3
MIC803-44D3VC3 AQ 4.38 140 –40° to +125°C SC70-3
MIC803-41D3VC3 AM 4.10 140 –40° to +125°C SC70-3
MIC803-40D3VC3 A5 4.00 140 –40° to +125°C SC70-3
MIC803-31D3VC3 A4 3.08 140 –40° to +125°C SC70-3
MIC803-30D3VC3 AX 3.00 140 –40° to +125°C SC70-3
MIC803-29D3VC3 AE 2.93 140 –40° to +125°C SC70-3
MIC803-26D3VC3 AB 2.63 140 –40° to +125°C SC70-3
MIC803-46D4VC3 AU 4.63 1120 –40° to +125°C SC70-3
MIC803-44D4VC3 AR 4.38 1120 –40° to +125°C SC70-3
MIC803-41D4VC3 AN 4.10 1120 –40° to +125°C SC70-3
MIC803-40D4VC3 A6 4.00 1120 –40° to +125°C SC70-3
MIC803-31D4VC3 AJ 3.08 1120 –40° to +125°C SC70-3
MIC803-30D4VC3 AZ 3.00 1120 –40° to +125°C SC70-3
MIC803-29D4VC3 A3 2.93 1120 –40° to +125°C SC70-3
MIC803-26D4VC3 AC 2.63 1120 –40° to +125°C SC70-3
MIC803-46D2VM3 AS 4.63 20 –40° to +125°C SOT23-3
MIC803-44D2VM3 AP 4.38 20 –40° to +125°C SOT23-3
MIC803-41D2VM3 AK 4.10 20 –40° to +125°C SOT23-3
MIC803-40D2VM3 A2 4.00 20 –40° to +125°C SOT23-3
MIC803-31D2VM3 AG 3.08 20 –40° to +125°C SOT23-3
MIC803-30D2VM3 AV 3.00 20 –40° to +125°C SOT23-3
MIC803-29D2VM3 AD 2.93 20 –40° to +125°C SOT23-3
MIC803-26D2VM3 AA 2.63 20 –40° to +125°C SOT23-3
MIC803-46D3VM3 AT 4.63 140 –40° to +125°C SOT23-3
Note:
1. All devices avail abl e i n tape and reel only. (Order ent ry PN, add TR. Example: MIC803-26D4VM3 TR)
Standard/f ull reel quantit y is 3,000 pieces.
Reel diameter is 7 inches. Hub diameter is 2 inches. Width is 8mm.
2. Underbar sym bol (_) may not be to scale.
3. –40° to +85°C temperature range.
Micrel, Inc.
MIC803
August 3, 2015
3 Revision 1.2
Ordering Information(1) (Continued)
Part Number Marking(2) Nominal
VTH (V) Minimum
tRESET(3) (ms) Junction Temperature Range Package
MIC803-44D3VM3 AQ 4.38 140 –40° to +125°C SOT23-3
MIC803-41D3VM3 AM 4.10 140 –40° to +125°C SOT23-3
MIC803-40D3VM3 A5 4.00 140 –40° to +125°C SOT23-3
MIC803-31D3VM3 A4 3.08 140 –40° to +125°C SOT23-3
MIC803-30D3VM3 AX 3.00 140 –40° to +125°C SOT23-3
MIC803-29D3VM3 AE 2.93 140 –40° to +125°C SOT23-3
MIC803-26D3VM3 AB 2.63 140 –40° to +125°C SOT23-3
MIC803-46D4VM3 AU 4.63 1120 –40° to +125°C SOT23-3
MIC803-44D4VM3 AR 4.38 1120 –40° to +125°C SOT23-3
MIC803-41D4VM3 AN 4.10 1120 –40° to +125°C SOT23-3
MIC803-40D4VM3 A6 4.00 1120 –40° to +125°C SOT23-3
MIC803-31D4VM3 AJ 3.08 1120 –40° to +125°C SOT23-3
MIC803-30D4VM3 AZ 3.00 1120 –40° to +125°C SOT23-3
MIC803-29D4VM3 A3 2.93 1120 –40° to +125°C SOT23-3
MIC803-26D4VM3 AC 2.63 1120 –40° to +125°C SOT23-3
Part Numbering Convention
Micrel, Inc.
MIC803
August 3, 2015
4 Revision 1.2
Pin Configuration
3-Pin SC70
(Top View)
3-Pin SOT-23
(Top View)
Pin Description
Pin Number Pin Name Pin Function
1 GND Ground Pin.
2 /RESET /RESET goes low if VCC falls below the reset threshold (VTH), and remains asserted for one timeout
period after VCC exceeds VTH.
3 VCC Power Supply Input and Monitored Voltage.
Micrel, Inc.
MIC803
August 3, 2015
5 Revision 1.2
Absolute Maximum Ratings(4)
Supply Voltage (VCC) ...................................... –0.3V to 6.0V
Reset Output (/RESET) .................................. –0.3V to 6.0V
Input Current (VCC) ...................................................... 20mA
Output Current (/RESET) ............................................ 20mA
Rate of Rise (VCC) ................................................... 100V/µs
Junction Temperature (TJ)…………………………....+150°C
Lead Temperature (soldering, 10s) ............................ 260°C
Storage Temperature (TS) ......................... –65°C to +150°C
ESD Rating(6) .................................................................. 3kV
Operating Ratings(5)
Supply Voltage (VCC) ........................................ 1.0V to 5.5V
Reset Output Voltage (/RESET) ...................... 0.0V to 5.5V
Junction Temperature (TJ) ........................ –40°C to +125°C
Junction Thermal Resistance
3-Pin SC70 (θJA) .............................................. 260°C/W
3-Pin SOT-23 (θJA) ........................................... 203°C/W
Electrical Characteristics(7)
For typical values, VCC = 5.0V for MIC803-46/44/41/40, VCC = 3.3V for MIC803-31/30/29, VCC = 3.0V for MIC803-26; TJ = 25°C,
Bold va lues indicate –40°C ≤ TJ ≤ +125°C; unless noted.
Parameter Conditions Min. Typ. Max. Units
Power Supply Input
Operating Voltage Range (VCC) TJ = –40˚C to +85˚C 1.0 5.5 V
TJ = –40˚C to +125˚C 1.2 5.5
Supply Current (ICC)
TJ = –40˚C to +85˚C VCC = 5.5V, No Load 5.5 15
µA
VCC = 3.6V, No Load 4.5 10
TJ = +85˚C to +125˚C VCC = 5.5V, No Load 18
VCC = 3.6V, No Load 13
Voltage Threshold
Reset Threshold (VTH)
MIC803-46 TJ = –40˚C to +85˚C 4.50 4.63 4.75
V
TJ = –40˚C to +125˚C 4.44 4.82
MIC803-44 TJ = –40˚C to +85˚C 4.25 4.38 4.50
TJ = –40˚C to +125˚C 4.20 4.56
MIC803-41 TJ = –40˚C to +85˚C 4.00 4.10 4.20
TJ = -40˚C to +125˚C 3.97 4.24
MIC803-40 TJ = –40˚C to +85˚C 3.89 4.00 4.10
TJ = –40˚C to +125˚C 3.80 4.20
MIC803-31 TJ = –40˚C to +85˚C 3.00 3.08 3.15
TJ = –40˚C to +125˚C 2.95 3.21
Notes:
4. Exceeding the absolute maximum ratings may damage the device.
5. The device is not guarant eed to function outside its operat i ng ratings.
6. Devices are ESD sensitive. Handling prec aut i ons are recomm ended. Human body model, 1.5k Ω in series with 100pF.
7. Specific at i on for pack aged product only.
Micrel, Inc.
MIC803
August 3, 2015
6 Revision 1.2
Electrical Characteristics(7) (Continued)
For typical values, VCC = 5.0V for MIC803-46/44/41/40, VCC = 3.3V for MIC803-31/30/29, VCC = 3.0V for MIC803-26; TJ = 25°C,
Bold va lues indicate –40°C ≤ TJ ≤ +125°C; unless noted.
Parameter Conditions Min. Typ. Max. Units
Voltage Threshold (Continued)
Reset Threshold (VTH)
MIC803-30 TJ = –40˚C to +85˚C 2.93 3.00 3.08
V
TJ = –40˚C to +125˚C 2.90 3.11
MIC803-29 TJ = –40˚C to +85˚C 2.82 2.93 3.00
TJ = –40˚C to +125˚C 2.81 3.05
MIC803-26 TJ = –40˚C to +85˚C 2.55 2.63 2.70
TJ = –40˚C to +125˚C 2.50 2.76
Reset Time
VCC to /RESET Delay (tD) VCC = VTH to (VTH – 100mV) 15 µs
Reset Timeout Period (tRESET)
D2 TJ = –40˚C to +85˚C 20 35 44
ms
TJ = –40˚C to +125˚C 16 48
D3 TJ = –40˚C to +85˚C 140 230 360
TJ = –40˚C to +125˚C 112 420
D4 TJ = –40˚C to +85˚C 1120 1800 2400
TJ = –40˚C to +125˚C 900 3200
Reset Output
/RESET Output Voltage (VOL)
VCC ≥ 4.0V, ISINK = 3.2mA 0.4 V
VCC > 2.5V, ISINK = 1.2mA 0.3 V
VCC ≥ 1.0V, ISINK = 50µA 0.3 V
/RESET Output Leakage VCC > VTH, /RESET Deasserted 1 μA
Micrel, Inc.
MIC803
August 3, 2015
7 Revision 1.2
Typical Characteris tics
V
CC
Operating Supply Current
vs. Temperature
3
4
5
6
7
-50 -20 10 40 70 100 130
TEM PERATURE (°C)
SUPPLY CURRENT (µA)
V
CC
= 3.6V
V
CC
to /R ESET Delay
vs. Temperature
0
5
10
15
20
25
30
-50 -20 10 40 70 100 130
TEM PERATURE (°C)
V
CC
to / RESET DELAY ( µ s )
V
CC
= V
TH
to V
TH
-100mV
Reset Timeout Period (D3)
vs. Temperature
200
220
240
260
280
300
-50 -20 10 40 70 100 130
TEM PERATURE (°C)
RESET TI MEOUT PERI OD (m s )
V
CC
= 5.5V
Normalized R eset Threshold
vs. Temperature
0.988
0.992
0.996
1.000
1.004
-50 -20 10 40 70 100 130
TEM PERATURE (°C)
NO RMALI ZE D RESET
THRESHOLD ( V)
VCC Operating Supply Current
vs. S upply Voltage
0
2
4
6
8
0123456
SUPPLY VOLTA GE (V)
SUPPLY CURRENT (µA)
V
TH
= 2.93V
Maxim um Transi ent Durati on
vs Overdrive
0
10
20
30
40
50
0200 400 600 800 1000
O VERDRI VE VOLTA G E, V
TH
- V
CC
(mV)
M AXIMUM TRANSIENT
DURATION (µs )
V
TH
= 2.93V
Micrel, Inc.
MIC803
August 3, 2015
8 Revision 1.2
Timing Diagram
V
CC
V
TH
RESET
0V
V
OL
t
RESET
t
D
t
RESET
Functional Diagram
RESET
GENERATOR
V
CC
(3)
GND (1)
RESET (2)
MIC803
+
-
V
TH
Micrel, Inc.
MIC803
August 3, 2015
9 Revision 1.2
Application Information
Mi cropro cessor Res et
The / RES ET pin is asser ted whene ver VCC fal ls be lo w the
reset threshold voltage, VTH. The /RESET pin remains
asserted for the duration of the reset timeout period
(tRESET) after VCC has risen above the reset threshold
voltage. T he res et func tion ensures the m icroproc ess or is
properl y res et and power s up in a known c ond it ion af ter a
power failure. /RESET will remain valid with VCC as low
as 1.0V.
The /RESET output is a simple open-drain N-channel
MOSFET structure. A pull-up resistor must be used to
pull this output u p to s ome voltage. For m os t applica tio ns ,
this voltage will be the same power supply that supplies
VCC to the MIC803. As shown in Figure 1, it is possible,
however, to tie this resistor to some other voltage. This
will allow the MIC803 to monitor one voltage while level-
shifting the /RESET output to some other voltage. The
pull-up vo ltage m ust be lim ited to 5.5V. T he res istor mus t
be small enough to supply current to the inputs and
leakage paths that are driven by the /RESET output.
V
CC
100k
+3.3V
RESET
V
CC
µP
MIC803
GND GND
RESET
+5V
Figure 1. MIC803 Used in a Multiple Supply System
/RESET Valid at Low Voltage
As VCC dr ops to 0V, t he MIC803 will no long er be able to
pull the /RESET output low, and the pull-up resistor will
pull the output high. The value of the pull-up resistor and
the volta ge it is c onnecte d to wil l affec t the point at whic h
this happens.
Figure 2. /RESET at Falling VCC
Wire ORing the /RESET Output
Since the /RESET output is open-drain, several reset
sources can be wire-ORed, in parallel, to allow resets
from multiple sources.
VCC Transients
The MIC803 is relatively immune to negative-going VCC
glitches below the reset threshold (see Typical
Characteristics, graph titled “Maximum Transient
Duration vs. Overdrive”). As shown in Figure 3, the
overdrive voltage is the difference between the threshold
voltage and the minimum point of the VCC glitch.
T ypicall y, an over dr iv e of 100mV, with d urati on of 15μs or
less will not ca us e a res et . I f addit ional transie nt im munit y
is needed, a 0.1μF bypass capacitor can be placed as
close as possible to the MIC803 on the VCC pin.
Figure 3. VCC Threshold
Micrel, Inc.
MIC803
August 3, 2015
12 Revision 1.2
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
Micrel, Inc. is a leadi ng global manufacturer of I C solutions for the worldwide high pe
rformance linear and power, LA N, and tim ing & comm
unications
markets. The Company’s products include advanced mixed
-signal, analog & power semiconductors; high-
performance communication, clock
management,
MEMs-based clock oscillators & crystal-less clock generators, Ethernet switches, and physical layer transceiver ICs.
Company customers
include leading manufacturers of enterprise, consumer, industrial, mobile, telecommunications, automotive, and computer produ
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Corporation headquarters and state
-of-the-art wafer fabrication facilities are located in
San Jose, CA, with regional sales and support offices and
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, the Company mai nt ains an extensive network
of distribut ors and reps worldwide.
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representations or warranties with respect to the accuracy or completeness of the information furnished in this data
sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use.
Micrel reserves the right to
change circuitry,
specifications and descriptions at any time without notice.
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property rights
is granted by this document. Except as provided in Micrel’s terms and
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whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including
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relating to fitness for a partic ular pu
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can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are inte
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MIC803-26D2VC3 TR MIC803-26D2VM3 TR MIC803-26D3VC3 TR MIC803-26D3VM3 TR MIC803-26D4VC3 TR
MIC803-26D4VM3 TR MIC803-29D2VC3 TR MIC803-29D2VM3 TR MIC803-29D3VC3 TR MIC803-29D3VM3 TR
MIC803-29D4VC3 TR MIC803-29D4VM3 TR MIC803-30D2VC3 TR MIC803-30D2VM3 TR MIC803-30D3VC3 TR
MIC803-30D3VM3 TR MIC803-30D4VC3 TR MIC803-30D4VM3 TR MIC803-31D2VC3 TR MIC803-31D2VM3 TR
MIC803-31D3VC3 TR MIC803-31D3VM3 TR MIC803-31D4VC3 TR MIC803-31D4VM3 TR MIC803-40D2VC3 TR
MIC803-40D2VM3 TR MIC803-40D3VC3 TR MIC803-40D3VM3 TR MIC803-40D4VC3 TR MIC803-40D4VM3 TR
MIC803-41D2VC3 TR MIC803-41D2VM3 TR MIC803-41D3VC3 TR MIC803-41D3VM3 TR MIC803-41D4VC3 TR
MIC803-41D4VM3 TR MIC803-44D2VC3 TR MIC803-44D2VM3 TR MIC803-44D3VC3 TR MIC803-44D3VM3 TR
MIC803-44D4VC3 TR MIC803-44D4VM3 TR MIC803-46D2VC3 TR MIC803-46D2VM3 TR MIC803-46D3VC3 TR
MIC803-46D3VM3 TR MIC803-46D4VC3 TR MIC803-46D4VM3 TR MIC803-26D4VC3-TR MIC803-26D2VC3-TR
MIC803-41D3VC3-TR MIC803-31D2VM3-TR MIC803-31D2VC3-TR MIC803-40D2VC3-TR MIC803-44D2VM3-TR
MIC803-29D3VC3-TR MIC803-26D2VM3-TR MIC803-40D4VC3-TR MIC803-41D4VC3-TR MIC803-44D2VC3-TR
MIC803-46D2VC3-TR MIC803-30D3VM3-TR MIC803-29D3VM3-TR MIC803-41D2VC3-TR MIC803-26D3VM3-TR
MIC803-41D4VM3-TR MIC803-44D4VC3-TR MIC803-46D4VC3-TR MIC803-40D3VC3-TR MIC803-30D4VC3-TR
MIC803-31D3VM3-TR MIC803-40D2VM3-TR MIC803-30D2VM3-TR MIC803-29D2VC3-TR MIC803-41D3VM3-TR
MIC803-29D4VC3-TR MIC803-40D4VM3-TR MIC803-46D2VM3-TR MIC803-44D3VM3-TR MIC803-46D3VM3-TR
MIC803-26D3VC3-TR MIC803-44D3VC3-TR MIC803-30D4VM3-TR MIC803-29D4VM3-TR MIC803-41D2VM3-TR
MIC803-30D3VC3-TR MIC803-44D4VM3-TR MIC803-29D2VM3-TR MIC803-31D4VM3-TR MIC803-40D3VM3-TR
MIC803-31D3VC3-TR MIC803-46D4VM3-TR MIC803-30D2VC3-TR MIC803-46D3VC3-TR MIC803-26D4VM3-TR
MIC803-31D4VC3-TR
