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MIC809/MIC810 Microprocessor Reset Circuits
MIC809/MIC810
Microprocessor Reset Circuits
Description
The MIC809/MIC810 are inexpensive microprocessor supervisory circuits that monitor power supplies in microprocessor based systems. The function of these devices is to assert a reset if the power supply drops below a designated reset threshold level. Several different reset threshold levels are available to accomodate 3V, 3.3V or 5V powered systems. The MIC809 has an active low RESET output, while the MIC810 offers an active high RESET output. The reset output is guaranteed to remain asserted for a minimum of 140ms after VCC has risen above the designated reset threshold level. The MIC809/MIC810 come in a 3pin SOT-23 package.
Pin Configuration
Top View
GND 1
MIC809
RESET 2
3 VCC
GND 1
MIC810
RESET 2
3 VCC
Typical Applications
Features
RESET * as 1.4V Remains Valid with VCC as Low * Precision Voltage Monitor for 3V, 3.3V or 5V Power Supplies * Available in 3-Pin SOT23 Package * <15A Supply Current * 140ms Minimum Reset Pulse Width * No External Components Required
* Portable Equipment * Intelligent Instruments * Critical Microprocessor Power Monitoring * Printers/Computers * Controllers
Reset Threshold Voltage (V) 4.63 4.38 4.00 3.08 2.93 2.63 Device Suffix L M J T S R
Typical Operating Circuit
8++ 8++
MIC809
Ordering Information
Part MIC809_U MIC810_U Package 3-Lead SOT23 3-Lead SOT23 Temp. Range -40C to +85C -40C to +85C
8++
P
Place the device suffix of desired reset threshold voltage from table above in blank to complete the part number.
4-5-6
4-5-6
1
MIC809/MIC810 Microprocessor Reset Circuits
Absolute Maximum Ratings
Terminal Voltage VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.0V Input Current, VCC, . . . . . . . . . . . . . . . . . . . . . . . 20mA Output Current, RESET, RESET . . . . . . . . . . . . . .20mA Rate of Rise, VCC . . . . . . . . . . . . . . . . . . . . . . 100V/s Operating Temperature Range MIC809-U, MIC810-U . . . . . . . . . . . . . . . -40C to 85C Storage Temperature Range . . . . . . . . . . . . .-65C to 150C Lead Temperature (Soldering - 10 sec.) . . . . . . . . . . . 300C Power Dissipation (TA = +70C) . . . . . . . . . . . . . . . . 320mW
Stresses above those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent device failure. Functionality at or above these limits is not implied. Exposure to absolute maximum ratings for extended periods may affect device reliability. Operating ranges define those limits between which the functionality of the device is guaranteed.
Electrical Characteristics
VCC = 5V for MIC8--L/M/J, VCC = 3.3V for MIC8--S/T, VCC = 3V for MIC8--R, TA = Operating Temperature Range, unless otherwise noted. Parameter Operating Voltage Range, VCC Supply Current, ICC Reset Voltage Threshold, VTH Conditions TA = 0C to 70C TA = -40C to 85C MIC809L/M/J, MIC810L/M/J VCC < 3.6V, MIC809R/S/T, MIC810R/S/T MIC809L, MIC810L MIC809M, MIC810M MIC809J, MIC810J MIC809T, MIC810T MIC809S, MIC810S MIC809R, MIC810R 4.50 4.25 3.89 3.00 2.85 2.55 140 ISource = 800A, MIC809L/M/J ISource = 500A, MIC809R/S/T VCC=VTH Min., ISink=3.2mA, MIC809L/M/J VCC=VTH Min., ISink =1.2mA, MIC809R/S/T VCC>1.4V, ISink =50A, TA = 0C to 70C VCC>1.6V, ISink =50A, TA = -40C to 85C 1.8V < VCC < VTH Min., ISource = 150A ISink=3.2mA, MIC810L/M/J ISink=1.2mA, MIC810R/S/T 0.8 X VCC 0.4 0.3 VCC - 1.5V 0.8 X VCC 0.4 0.3 0.3 0.3 Min 1.4 1.6 9 6 4.63 4.38 4.00 3.08 2.93 2.63 240 Typ Max 5.5 5.5 15 10 4.75 4.50 4.10 3.15 3.00 2.70 560 Units V A V
Reset Timeout Period RESET Output Voltage, VOH RESET Output Voltage, VOL
ms V
V
RESET Output Voltage, VOH RESET Output Voltage, VOL
V
V
2
MIC809/MIC810 Microprocessor Reset Circuits
Pin Functions
Pin No.
Pin Name GND RESET MIC809 1 2 MIC810 1 N/A IC Ground Pin. RESET goes low if VCC falls below the reset threshold and remains asserted for one reset timeout period (140ms min.) after VCC exceeds the reset threshold. RESET goes high if VCC falls below the reset threshold and remains asserted for one reset timeout period (140ms min.) after VCC exceeds the reset threshold. Power supply input, 3V, 3.3V or 5V.
RESET
N/A
2
VCC
3
3
3
MIC809/MIC810 Microprocessor Reset Circuits
Block Diagram
VCC (3) Reset Threshold (V)
+ -
RESET GENERATOR
RESET (2) RESET (MIC810)
GND (1)
Figure 1. MIC809/810 Block Diagram
4
MIC809/MIC810 Microprocessor Reset Circuits
Circuit Description
Microprocessor Reset The RESET pin is asserted whenever VCC falls below the reset threshold voltage. The reset pin remains asserted for a period of 240ms after VCC has risen above the reset threshold voltage. The reset function ensures the microprocessor is properly reset and powers up into a known condition after a power failure. RESET will remain valid with VCC as low as 1.4V. VCC Transients The MIC809/MIC810 are relatively immune to negativegoing VCC glitches below the reset threshold. Typically, a negative-going transient 125mV below the reset threshold with a duration of 50s (25s for MIC8__R/S/T) or less will not cause an unwanted reset. Interfacing to Bidirectional Reset Pins The MIC809/MIC810 can interface with Ps with bidirectional reset pins by connecting a 4.7K resistor in series with the MIC809/MIC810 output and the P reset pin.
8++
8JDH J
8JDH J
4-5-6
Figure 2. Reset Timing Diagram
VCC VCC VCC P RESET
100K
MIC809
RESET
RESET Valid to 0V A resistor can be added from the RESET pin to ground to ensure the RESET output remains low with V CC down to 0V. A 100K resistor connected from RESET to ground is recommended. The size of the resistor should be large enough to not load the RESET output and small enough to pull-down any stray leakage currents.
Figure 3. RESET Valid to VCC = OV
5
MIC809/MIC810 Microprocessor Reset Circuits
Alternate Source Cross Reference Guide
Industry P/N
MAX809JEUR-T MAX809LEUR-T MAX809MEUR-T MAX809REUR-T MAX809SEUR-T MAX809TEUR-T MAX810JEUR-T MAX810LEUR-T MAX810MEUR-T MAX810REUR-T MAX810SEUR-T MAX810TEUR-T
MIC Direct Replacement
MIC809JU MIC809LU MIC809MU MIC809RU MIC809SU MIC809TU MIC810JU MIC810LU MIC810MU MIC810RU MIC810SU MIC810TU
6
MIC809/MIC810 Microprocessor Reset Circuits
Packaging Information
U Package, 3-Pin SOT-23 Small-Outline Transistor Package
0.021 0.015
0.055 0.047
0.098 0.083
0.120 0.105 0.0059 0.040 0.031 0.0035 0-81/4
0.079 0.071
0.004 0.001
0.010 0.005
Dimensions are in inches.
Device Marking Information
Lot Code
IJXX ILXX IMXX IRXX ISXX ITXX JJXX JLXX JMXX JRXX JSXX JTXX
= = = = = = = = = = = =
MIC809J MIC809L MIC809M MIC809R MIC809S MIC809T MIC810J MIC810L MIC810M MIC810R MIC810S MIC810T
7
MIC809/MIC810 Microprocessor Reset Circuits
Packaging Information
Tape and Reel Information
4.00.1
1.50.1 2.00.05
1.750.1
3.50.05 8.00.3
4.00.1
1.10.1
2.70.1
1.20.1
3.10.1
Dimensions are in millimeters.
8

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