Micrel MIC803-40D2VM3 3-pin microprocessor supervisor circuit with open-drain reset output Datasheet

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.
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The MIC803 consumes only 4.5μA of supply current and
offers three reset delay periods of 20ms, 140ms and
1120ms (min). 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.
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 (min) 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 x 2.1mm)
3-pin SOT-23 package (2.3mm x 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
December 2010
M9999-122310-A
Micrel, Inc.
MIC803
Ordering Information (1)
Marking
Nominal VTH
(V)
Min. tRESET (2)
(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
Part Number
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
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
December 2010
2
M9999-122310-A
Micrel, Inc.
MIC803
(2)
Marking
Nominal VTH
(V)
MIC803-46D4VM3
AU
4.63
MIC803-44D4VM3
AR
4.38
MIC803-41D4VM3
AN
4.10
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 Number
Junction Temperature
Range
Package
1120
–40° to +125°C
SOT23-3
1120
–40° to +125°C
SOT23-3
1120
–40° to +125°C
SOT23-3
Min. tRESET
(ms)
Notes:
1. 1: All devices available in Tape and Reel only.
2. 2: –40° to +85°C Temp. Range
Part Numbering Convention:
Pin Configuration
3-Pin SC70
3-Pin SOT-23
Pin Description
Pin Number
Pin Name
1
GND
2
/RESET
3
VCC
December 2010
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
3
M9999-122310-A
Micrel, Inc.
MIC803
Absolute Maximum Ratings(1)
Operating Ratings(2)
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/us
Junction Temperature (TJ)…………………………....+150˚C
Lead Temperature (soldering, 10sec.)....................... 260°C
Storage Temperature (TS)..........................-65°C to +150°C
ESD Rating(3) .................................................................. 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 SOT23 (θJA)............................................203°C/W
Electrical Characteristics(4)
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
1.0
5.5
TJ = -40˚C to +125˚C
1.2
5.5
Units
Power Supply Input
Operating Voltage Range (VCC)
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
MIC803-41
MIC803-40
Reset Threshold (VTH)
MIC803-31
MIC803-30
MIC803-29
MIC803-26
December 2010
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
TJ = -40˚C to +85˚C
2.93
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
4
4.63
4.75
4.82
4.38
4.50
4.56
4.10
4.20
4.24
4.00
4.10
4.20
3.08
3.15
V
3.21
3.00
3.08
3.11
2.93
3.00
3.05
2.63
2.70
2.76
M9999-122310-A
Micrel, Inc.
MIC803
Electrical Characteristics (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
Units
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 = +85˚C to +125˚C
16
TJ = -40˚C to +85˚C
140
TJ = +85˚C to +125˚C
112
TJ = -40˚C to +85˚C
1120
TJ = +85˚C to +125˚C
900
μs
35
44
230
360
48
420
1800
ms
2400
3200
Reset Output
/RESET Output Voltage (VOL)
/RESET Output Leakage
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
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
December 2010
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M9999-122310-A
Micrel, Inc.
MIC803
Typical Characteristics
30
6
5
4
3
300
V CC = VTH to VTH-100mV
25
20
15
10
5
0
-50
-20
10
40
70
100
V CC = 5.5V
280
260
240
220
200
-50
130
-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)
December 2010
100
130
70
100
130
V TH = 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 (ms)
VCC = 3.6V
VCC to /RESET DELAY (µs)
SUPPLY CURRENT (µA)
7
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)
6
5
6
0
200
400
600
800
1000
OVERDRIVE VOLTAGE, VTH - VCC (mV)
M9999-122310-A
Micrel, Inc.
MIC803
Timing Diagram
Functional Diagram
MIC803
RESET (2)
VCC (3)
RESET
GENERATOR
+
-
VTH
GND (1)
December 2010
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M9999-122310-A
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.
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 level-shifting 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
Wire OR’ing 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 the Typical
Characteristic Curve, Maximum Transient Duration vs
Overdrive on page 6 of the datasheet. 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.
Figure 1. MIC803 used in a Multiple Supply System
/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.
December 2010
Figure 3. VCC Transient
8
M9999-122310-A
Micrel, Inc.
MIC803
Package Information
3-Pin SC-70 (C3)
December 2010
9
M9999-122310-A
Micrel, Inc.
MIC803
3-Pin SOT-23 (M3)
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 makes no 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. 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.
December 2010
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M9999-122310-A
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