MIC803 - Micrel

MIC803
3-Pin Microprocessor Supervisor Circuit
with Open-Drain Reset Output
General Description
Features
The MIC803 is a single-voltage supervisor with 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 period once the power supply 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.
•
•
•
•
•
4.5μA supply current (typical) at 3.6V
Open-drain /RESET output
/RESET remains valid with VCC as low 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
VCC
VCC
100k
MIC803
RESET
GND
µP
RESET
GND
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
Micrel, Inc.
MIC803
Ordering Information(1)
Part Number
(2)
Marking
Nominal
VTH (V)
Minimum
(3)
tRESET (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 available in tape and reel only. (Order entry PN, add TR. Example: MIC803-26D4VM3 TR)
Standard/full reel quantity is 3,000 pieces.
Reel diameter is 7 inches. Hub diameter is 2 inches. Width is 8mm.
2. Underbar symbol (_) may not be to scale.
3. –40° to +85°C temperature range.
August 3, 2015
2
Revision 1.2
Micrel, Inc.
MIC803
Ordering Information(1) (Continued)
Part Number
(2)
Marking
Nominal
VTH (V)
Minimum
(3)
tRESET (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
August 3, 2015
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Revision 1.2
Micrel, Inc.
MIC803
Pin Configuration
3-Pin SC70
(Top View)
3-Pin SOT-23
(Top View)
Pin Description
Pin Number
Pin Name
1
GND
2
/RESET
3
VCC
August 3, 2015
Pin Function
Ground Pin.
/RESET goes low if VCC falls below the reset threshold (VTH), and remains asserted for one timeout
period after VCC exceeds VTH.
Power Supply Input and Monitored Voltage.
4
Revision 1.2
Micrel, Inc.
MIC803
Absolute Maximum Ratings(4)
Operating Ratings(5)
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
(6)
ESD Rating .................................................................. 3kV
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 values 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
TJ = –40˚C to +125˚C
1.2
5.5
TJ = –40˚C to +85˚C
Supply Current (ICC)
TJ = +85˚C to +125˚C
VCC = 5.5V, No Load
5.5
15
VCC = 3.6V, No Load
4.5
10
VCC = 5.5V, No Load
18
VCC = 3.6V, No Load
13
V
µA
Voltage Threshold
MIC803-46
MIC803-44
Reset Threshold (VTH)
MIC803-41
MIC803-40
MIC803-31
TJ = –40˚C to +85˚C
4.50
TJ = –40˚C to +125˚C
4.44
TJ = –40˚C to +85˚C
4.25
TJ = –40˚C to +125˚C
4.20
TJ = –40˚C to +85˚C
4.00
TJ = -40˚C to +125˚C
3.97
TJ = –40˚C to +85˚C
3.89
TJ = –40˚C to +125˚C
3.80
TJ = –40˚C to +85˚C
3.00
TJ = –40˚C to +125˚C
2.95
4.63
4.75
4.82
4.38
4.50
4.56
4.10
4.20
V
4.24
4.00
4.10
4.20
3.08
3.15
3.21
Notes:
4. Exceeding the absolute maximum ratings may damage the device.
5. The device is not guaranteed to function outside its operating ratings.
6. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
7. Specification for packaged product only.
August 3, 2015
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Revision 1.2
Micrel, Inc.
MIC803
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 values indicate –40°C ≤ TJ ≤ +125°C; unless noted.
Parameter
Conditions
Min.
Typ.
Max.
TJ = –40˚C to +85˚C
2.93
3.00
3.08
TJ = –40˚C to +125˚C
2.90
TJ = –40˚C to +85˚C
2.82
TJ = –40˚C to +125˚C
2.81
TJ = –40˚C to +85˚C
2.55
TJ = –40˚C to +125˚C
2.50
Units
Voltage Threshold (Continued)
MIC803-30
Reset Threshold (VTH)
MIC803-29
MIC803-26
3.11
2.93
3.00
3.05
2.63
V
2.70
2.76
Reset Time
VCC to /RESET Delay (tD)
VCC = VTH to (VTH – 100mV)
D2
Reset Timeout Period (tRESET)
D3
D4
15
TJ = –40˚C to +85˚C
20
TJ = –40˚C to +125˚C
16
TJ = –40˚C to +85˚C
140
TJ = –40˚C to +125˚C
112
TJ = –40˚C to +85˚C
1120
TJ = –40˚C to +125˚C
900
35
µs
44
48
230
360
420
1800
ms
2400
3200
Reset Output
/RESET Output Voltage (VOL)
/RESET Output Leakage
August 3, 2015
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
1
μA
VCC > VTH, /RESET Deasserted
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Revision 1.2
Micrel, Inc.
MIC803
Typical Characteristics
30
6
5
4
3
300
RESET TIMEOUT PERIOD (ms)
VCC = 3.6V
VCC to /RESET DELAY (µs)
SUPPLY CURRENT (µA)
7
VCC = VTH to VTH -100mV
25
20
15
10
5
0
-50
-20
10
40
70
100
130
VCC = 5.5V
280
260
240
220
200
-50
-20
TEMPERATURE (°C)
10
40
70
100
130
-50
TEMPERATURE (°C)
Normalized Reset Threshold
vs. Temperature
0.992
0.988
-20
10
40
70
TEMPERATURE (°C)
August 3, 2015
100
130
70
100
130
VTH = 2.93V
6
4
2
0
-50
40
50
VTH = 2.93V
MAXIMUM TRANSIENT
DURATION (µs)
SUPPLY CURRENT (µA)
0.996
10
Maximum Transient Duration
vs Overdrive
8
1.000
-20
TEMPERATURE (°C)
VCC Operating Supply Current
vs. Supply Voltage
1.004
NORMALIZED RESET
THRESHOLD (V)
Reset Timeout Period (D3)
vs. Temperature
VCC to /RESET Delay
vs. Temperature
VCC Operating Supply Current
vs. Temperature
40
30
20
10
0
0
1
2
3
4
SUPPLY VOLTAGE (V)
7
5
6
0
200
400
600
800
1000
OVERDRIVE VOLTAGE, VTH - VCC (mV)
Revision 1.2
Micrel, Inc.
MIC803
Timing Diagram
VTH
VCC
0V
RESET
VOL
tRESET
tD
tRESET
Functional Diagram
MIC803
RESET (2)
VCC (3)
RESET
GENERATOR
+
-
VTH
GND (1)
August 3, 2015
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Revision 1.2
Micrel, Inc.
MIC803
Application Information
Microprocessor Reset
The /RESET pin is asserted whenever VCC falls below 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. The reset function ensures 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 1.0V.
/RESET Valid at Low Voltage
As VCC drops to 0V, the MIC803 will no longer 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 voltage it is connected to will affect the point at which
this happens.
The /RESET output is a simple open-drain N-channel
MOSFET structure. A pull-up resistor must be used to
pull this output up to some voltage. For most applications,
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 levelshifting the /RESET output to some other voltage. The
pull-up voltage must be limited to 5.5V. The resistor must
be small enough to supply current to the inputs and
leakage paths that are driven by the /RESET output.
Figure 2. /RESET at Falling VCC
+5V
+3.3V
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
VCC
100k
µP
MIC803
RESET
GND
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.
Typically, an overdrive of 100mV, with duration of 15μs or
less will not cause a reset. If additional transient immunity
is needed, a 0.1μF bypass capacitor can be placed as
close as possible to the MIC803 on the VCC pin.
RESET
GND
Figure 1. MIC803 Used in a Multiple Supply System
Figure 3. VCC Threshold
August 3, 2015
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Revision 1.2
Micrel, Inc.
MIC803
Package Information and Recommended Landing Pattern(8)
3-Pin SC70 (MM)
Note:
8. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com.
August 3, 2015
10
Revision 1.2
Micrel, Inc.
MIC803
Package Information and Recommended Landing Pattern(8)
3-Pin SOT-23 (MM)
August 3, 2015
11
Revision 1.2
Micrel, Inc.
MIC803
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 leading global manufacturer of IC solutions for the worldwide high performance linear and power, LAN, and timing & communications
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 products.
Corporation headquarters and state-of-the-art wafer fabrication facilities are located in San Jose, CA, with regional sales and support offices and
advanced technology design centers situated throughout the Americas, Europe, and Asia. Additionally, the Company maintains an extensive network
of distributors and reps worldwide.
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this datasheet. 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. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical
implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
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© 2010 Micrel, Incorporated.
August 3, 2015
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Revision 1.2