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MIC809/810
Microprocessor Reset Circuits
General Description
The MIC809 and 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 accommodate 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. Having a push-pull output stage, the MIC809/810 does not require a pull-up resistor at the output. The MIC809/810 comes in a 3-pin SOT-23 and SC-70 package. The MIC809 is also available with a shorter reset timeout (30ms min.). See the MIC809-5. All support documentation can be found on Micrel's web site at www.micrel.com.
Features
* Precision voltage monitor for 3V, 3.3V or 5V power supplies * /RESET remains valid with VCC as low as 1.4V for SOT23 packaged part * /RESET remains valid with VCC as low as 1V for SC70 packaged part * Typically less than15A supply current for SOT-23 packaged part * 5 typical supply current for SC70 packaged part * 140ms minimum reset pulse widths available * Available in 3-pin SOT-23 and SC-70 package
Applications
* * * * * Portable equipment Intelligent instruments Critical microprocessor power monitoring Printers/computers Controllers
Typical Application
VCC
VCC VCC P RESET
MIC809
RESET
Micrel, Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com
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MIC809/810
Micrel
Part Number MIC809LBC3 MIC809MBC3 MIC809JBC3 MIC809TBC3 MIC809SBC3 MIC809RBC3 MIC810LBC3 MIC810MBC3 MIC810JBC3 MIC810TBC3 MIC810SBC3 MIC810RBC3 MIC809LYC3 MIC809MYC3 MIC809JYC3 MIC809TYC3 MIC809SYC3 MIC809RYC3 MIC810LYC3 MIC810MYC3 MIC810JYC3 MIC810TYC3 MIC810SYC3 MIC810RYC3 Threshold Voltage 4.63 4.38 4.00 3.08 2.93 2.63 4.63 4.38 4.00 3.08 2.93 2.63 4.63 4.38 4.00 3.08 2.93 2.63 4.63 4.38 4.00 3.08 2.93 2.63 Operating Temp. Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Lead Finish Standard Standard Standard Standard Standard Standard Standard Standard Standard Standard Standard Standard Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free
Ordering Information
MIC809LU MIC809MU MIC809JU MIC809TU MIC809SU MIC809RU MIC810LU MIC810MU MIC810JU MIC810TU MIC810SU MIC810RU MIC809LUY MIC809MUY MIC809JUY MIC809TUY MIC809SUY MIC809RUY MIC810LUY MIC810MUY MIC810JUY MIC810TUY MIC810SUY MIC810RUY
3-lead SOT-23 Package3-lead SC-70 Package
Marking IL IM IJ IT IS IR JL JM JJ JT JS JR IL IM IJ IT IS IR JL JM JJ JT JS JR
Note: Contact factory for SC70 packaged Pb-free options..
Pin Configuration
GND 1 GND 1
MIC809
RESET 2
3 VCC RESET 2
MIC810
3 VCC
MIC809 3-Lead SOT23 MIC809 3-Lead SC70
MIC810 3-Lead SOT23 MIC810 3-Lead SC70
Pin Description
Pin Number MIC809 1 2 Pin Number MIC810 1 N/A Pin Name GND /RESET Pin Function 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.
N/A
2
RESET
3
3
VCC
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MIC809/810
Micrel
Absolute Maximum Ratings(1)
Terminal Voltage (VCC) ...................................-0.3V to 6.0V Input Current (VCC)..................................................... 20mA Output Current (RESET, /RESET) .............................. 20mA Lead Temperature (soldering, 10 sec.) ...................... 300C Storage Temperature (TS) .......................... -65C to 150C Rate of Rise (VCC) .................................................. 100V/s ESD Rating(3) ............................................ 3kV (SC70 Package)
Operating Ratings(2)
Operating Temperature Range MIC809 ..................................................... -40C to 85C MIC810 ..................................................... -40C to 85C Power Dissipation (TA = +70C) .............................. 320mW
Electrical Characteristics(4)
For typical values, VCC = 5V for MIC8_L/M/J, VCC = 3.3V for MIC8_S/T, VCC = 3V for MIC8_R; TA = 25C, bold values indicate -40C TA +85C; unless noted. Symbol VCC Parameter Condition Min 1.4 1.6 1 9 5 6 Typ Max 5.5 5.5 5.5 15 15 10 Operating Voltage Range TA = 0C to 70C SOT-23 package SOT-23 package SC70 package V V V A A A Units
TA = -40C to 85C TA = -40C to 85C
ICC
Supply Current
MIC809L/M/J, MIC810L/M/J SOT-23 Package
For SC-70 Package: MIC809L/M/J, MIC810L/M/J
VCC < 3.6V, MIC809R/S/T, MIC810R/S/T SOT-23 package
For SC-70 Package: VCC < 3.6V, MIC809R/S/T, MIC810R/S/T
VTH Reset Voltage Threshold MIC809L, MIC810L MIC809M, MIC810M MIC809J, MIC810J MIC809T, MIC810T MIC809S, MIC810S MIC809R, MIC810R tRST VOH VOL Reset Timeout Period /RESET Output Voltage MIC809 /RESET Output Voltage MIC809 ISOURCE = 500A, MIC809R/S/T ISOURCE = 800A, MIC809L/M/J 4.50 4.25 3.89 3.00 2.85 2.55 140 VCC-1.5V 0.8xVCC
5 4.63 4.38 4.00 3.08 2.93 2.63 240
10 4.75 4.50 4.10 3.15 3.00 2.70 560
A V V V V V V ms V V
VCC = VTH min., ISINK = 3.2mA, MIC809L/M/J VCC > 1.4V, ISINK = 50A, TA = 0C to +70C For SC-70 Package: VCC = 1V, ISINK = 50A A TA = -40C to 85C
0.4 0.3 0.3 0.3 0.3
V V V V V V V V
VCC = VTH min., ISINK = 1.2mA, MIC809R/S/T
VOH VOL
RESET Output Voltage RESET Output Voltage
MIC810 MIC810
VCC > 1.6V, ISINK = 50A, TA = -40 to +85C ISINK = 3.2mA, MIC810L/M/J 1.8V < VCC < VTH min., ISOURCE = 150A ISINK = 1.2mA, MIC810R/S/T
0.8xVCC
0.4 0.3
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.
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Micrel
Timing Diagram
VCC VTH tRST /RESET VTH tRST
Reset Timing Diagram
Functional Diagram
VCC (3) Reset Threshold (V)
+ -
RESET GENERATOR
RESET (2) RESET (MIC810)
GND (1)
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MIC809/810
Micrel Interfacing to Bidirectional Reset Pins The MIC809/810 can interface with Ps with bidirectional reset pins by connecting a 4.7k resistor in series with the MIC809/810 output and the P reset pin. /RESET Valid at Low Voltage A resistor can be added from the /RESET pin to ground to ensure the /RESET output remains low with VCC down to 0V. A 100k resistor connected from the /RESET to ground is recommended. The resistor should be small enough to pull-down any stray leakage currents and large enough not to load the reset output. See Figure below.
VCC VCC VCC P RESET
100K
Applications Information
Microprocessor Reset The /RESET (or RESET) pin is asserted whenever VCC falls below the reset threshold voltage. The /RESET pin remains asserted for a period of 140ms 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 1.4V (1V for SC-70 package). VCC Transients The MIC809/810 are relatively immune to negative-going VCC glitches below the reset threshold. Typically, a negative-going transient 125mV below the reset threshold with a duration of 20s or less (SC70 package) will not cause a reset.
MIC809
RESET
Reset Valid to VCC = 0V
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Micrel
Package Information
1.40 (0.055) 2.50 (0.098) 1.19 (0.047) 2.10 (0.083) C L DIMENSIONS : MM (INCH) 8 0 0.15 (0.006) 0.076 (0.0030)
C L 2.36 (0.093) 2.28 (0.090) 3.05 (0.120) 2.67 (0.105)
1.15 (0.045) 0.76 (0.030)
0.445 (0.0175) TYP 3 PLACES
0.10 (0.004) 0.013 (0.0005)
0.41 (0.016) 0.13 (0.005)
3-lead SOT-23 (M3)
3-Lead SC-70 (C3)
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
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 at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2005 Micrel, Incorporated. M0450-041405
MICREL, INC.
2180 FORTUNE DRIVE
SAN JOSE, CA 95131
USA
6
April 2005

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