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MIC803
3-Pin Microprocessor Supervisor Circuit with Open-Drain Reset Output
General Description
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 4.5A 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.
Features
* * * * * * * * * 4.5A 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) -40C to +125C 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 RESET
P
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)
Part Number MIC803-46D2VC3 MIC803-44D2VC3 MIC803-41D2VC3 MIC803-40D2VC3 MIC803-31D2VC3 MIC803-30D2VC3 MIC803-29D2VC3 MIC803-26D2VC3 MIC803-46D3VC3 MIC803-44D3VC3 MIC803-41D3VC3 MIC803-40D3VC3 MIC803-31D3VC3 MIC803-30D3VC3 MIC803-29D3VC3 MIC803-26D3VC3 MIC803-46D4VC3 MIC803-44D4VC3 MIC803-41D4VC3 MIC803-40D4VC3 MIC803-31D4VC3 MIC803-30D4VC3 MIC803-29D4VC3 MIC803-26D4VC3 MIC803-46D2VM3 MIC803-44D2VM3 MIC803-41D2VM3 MIC803-40D2VM3 MIC803-31D2VM3 MIC803-30D2VM3 MIC803-29D2VM3 MIC803-26D2VM3 MIC803-46D3VM3 MIC803-44D3VM3 MIC803-41D3VM3 MIC803-40D3VM3 MIC803-31D3VM3 MIC803-30D3VM3 MIC803-29D3VM3 MIC803-26D3VM3 Marking AS AP AK A2 AG AV AD AA AT AQ AM A5 A4 AX AE AB AU AR AN A6 AJ AZ A3 AC AS AP AK A2 AG AV AD AA AT AQ AM A5 A4 AX AE AB Nominal VTH (V) 4.63 4.38 4.10 4.00 3.08 3.00 2.93 2.63 4.63 4.38 4.10 4.00 3.08 3.00 2.93 2.63 4.63 4.38 4.10 4.00 3.08 3.00 2.93 2.63 4.63 4.38 4.10 4.00 3.08 3.00 2.93 2.63 4.63 4.38 4.10 4.00 3.08 3.00 2.93 2.63 Min. tRESET (2) (ms) 20 20 20 20 20 20 20 20 140 140 140 140 140 140 140 140 1120 1120 1120 1120 1120 1120 1120 1120 20 20 20 20 20 20 20 20 140 140 140 140 140 140 140 140 Junction Temperature Range -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C Package SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SC70-3 SOT23-3 SOT23-3 SOT23-3 SOT23-3 SOT23-3 SOT23-3 SOT23-3 SOT23-3 SOT23-3 SOT23-3 SOT23-3 SOT23-3 SOT23-3 SOT23-3 SOT23-3 SOT23-3
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Part Number MIC803-46D4VM3 MIC803-44D4VM3 MIC803-41D4VM3 MIC803-40D4VM3 MIC803-31D4VM3 MIC803-30D4VM3 MIC803-29D4VM3 MIC803-26D4VM3
Notes: 1. 1: All devices available in Tape and Reel only. 2. 2: -40 to +85C Temp. Range
MIC803
Marking AU AR AN A6 AJ AZ A3 AC Nominal VTH (V) 4.63 4.38 4.10 4.00 3.08 3.00 2.93 2.63 Min. tRESET (ms) 1120 1120 1120 1120 1120 1120 1120 1120
(2)
Junction Temperature Range -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C
Package SOT23-3 SOT23-3 SOT23-3 SOT23-3 SOT23-3 SOT23-3 SOT23-3 SOT23-3
Part Numbering Convention:
Pin Configuration
3-Pin SC70
3-Pin SOT-23
Pin Description
Pin Number 1 2 3 Pin Name GND /RESET VCC 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
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Absolute Maximum Ratings(1)
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)..................................+150C Lead Temperature (soldering, 10sec.)....................... 260C Storage Temperature (TS)..........................-65C to +150C ESD Rating(3) .................................................................. 3kV
Operating Ratings(2)
Supply Voltage (VCC)........................................ 1.0V to 5.5V Reset Output Voltage (/RESET) ...................... 0.0V to 5.5V Junction Temperature (TJ) ........................ -40C to +125C Junction Thermal Resistance 3-Pin SC70 (JA) ..............................................260C/W 3-Pin SOT23 (JA)............................................203C/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 = 25C, Bold values indicate -40C < TJ < +125C; unless noted. Parameter Power Supply Input Operating Voltage Range (VCC) TJ = -40C to +85C TJ = -40C to +125C TJ = -40C to +85C Supply Current (ICC) TJ = +85C to +125C Voltage Threshold MIC803-46 MIC803-44 MIC803-41 MIC803-40 Reset Threshold (VTH) MIC803-31 MIC803-30 MIC803-29 TJ = -40C to +85C TJ = -40C to +125C TJ = -40C to +85C TJ = -40C to +125C TJ = -40C to +85C TJ = -40C to +125C TJ = -40C to +85C TJ = -40C to +125C TJ = -40C to +85C TJ = -40C to +125C TJ = -40C to +85C TJ = -40C to +125C TJ = -40C to +85C TJ = -40C to +125C TJ = -40C to +85C TJ = -40C to +125C 4.50 4.44 4.25 4.20 4.00 3.97 3.89 3.80 3.00 2.95 2.93 2.90 2.82 2.81 2.55 2.50 2.63 2.93 3.00 3.08 4.00 4.10 4.38 4.63 4.75 4.82 4.50 4.56 4.20 4.24 4.10 4.20 3.15 3.21 3.08 3.11 3.00 3.05 2.70 2.76 V VCC = 5.5V, no Load VCC = 3.6V, no Load VCC = 5.5V, no Load VCC = 3.6V, no Load 1.0 1.2 5.5 4.5 5.5 5.5 15 10 18 13 A V Conditions Min Typ Max Units
MIC803-26
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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 = 25C, Bold values indicate -40C < TJ < +125C; unless noted. Parameter Reset Time VCC to /RESET Delay (tD) VCC = VTH to (VTH - 100mV) D2 D3 D4 TJ = -40C to +85C TJ = +85C to +125C Reset Timeout Period (tRESET) TJ = -40C to +85C TJ = +85C to +125C TJ = -40C to +85C TJ = +85C to +125C Reset Output VCC 4.0V, ISINK = 3.2mA /RESET Output Voltage (VOL) VCC > 2.5V, ISINK = 1.2mA VCC 1.0V, ISINK = 50A /RESET Output Leakage
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, 1.5k in series with 100pF. 4. Specification for packaged product only.
Conditions
Min
Typ 15
Max
Units s
20 16 140 112 1120 900
35 230 1800
44 48 360 420 2400 3200 V V V A ms
0.4 0.3 0.3 1
VCC > VTH, /RESET deasserted
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Typical Characteristics
7 SUPPLY CURRENT (A)
VCC Operating Supply Current vs. Temperature
VCC to /RESET DELAY (s)
VCC = 3.6V
VCC to /RESET Delay vs. Temperature
30 RESET TIMEOUT PERIOD (ms) 25 20 15 10 5 0
V CC = VTH to VTH-100mV
Reset Timeout Period (D3) vs. Temperature
300
V CC = 5.5V
6
280 260 240 220 200
5
4
3 -50 -20 10 40 70 100 130
-50
-20
10
40
70
100
130
-50
-20
10
40
70
100
130
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
Normalized Reset Threshold vs. Temperature
1.004 SUPPLY CURRENT (A) NORMALIZED RESET THRESHOLD (V) 8
VCC Operating Supply Current vs. Supply Voltage
50
VTH = 2.93V
Maximum Transient Duration vs Overdrive
V TH = 2.93V
MAXIMUM TRANSIENT DURATION (s)
0 1 2 3 4 5 6
1.000
6
40 30 20 10 0 0 200 400 600 800 1000
0.996
4
0.992
2
0.988 -50 -20 10 40 70 100 130
0 TEMPERATURE (C)
SUPPLY VOLTAGE (V)
OVERDRIVE VOLTAGE, VTH - VCC (mV)
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Timing Diagram
Functional Diagram
MIC803 RESET (2) VCC (3)
RESET GENERATOR
+ -
VTH
GND (1)
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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 15s or less will not cause a reset. If additional transient immunity is needed, a 0.1F 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.
Figure 3. VCC Transient
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MIC803
Package Information
3-Pin SC-70 (C3)
December 2010
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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 indemnify Micrel for any damages resulting from such use or sale. (c) 2010 Micrel, Incorporated.
December 2010
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