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MIC811 Dataheets PDF



Part Number MIC811
Manufacturers Micrel Semiconductor
Logo Micrel Semiconductor
Description Microprocessor Reset Circuits
Datasheet MIC811 DatasheetMIC811 Datasheet (PDF)

MIC811/812 Microprocessor Reset Circuits General Description The MIC811 and MIC812 are inexpensive microprocessor supervisory circuits that monitor power supplies in microprocessor based systems. The function of this device is to assert a reset if either the power supply drops below a designated reset threshold level or /MR is forced low. Several different reset threshold levels are available to accommodate 3V, 3.3V or 5V powered systems. The MIC811 has an active low /RESET output, while the MI.

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MIC811/812 Microprocessor Reset Circuits General Description The MIC811 and MIC812 are inexpensive microprocessor supervisory circuits that monitor power supplies in microprocessor based systems. The function of this device is to assert a reset if either the power supply drops below a designated reset threshold level or /MR is forced low. Several different reset threshold levels are available to accommodate 3V, 3.3V or 5V powered systems. The MIC811 has an active low /RESET output, while the MIC812 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 designed reset threshold level. Having a push-pull output stage, the MIC811/812 does not require a pull-up resistor at the output. The MIC811/812 comes in a 4-pin SOT-143 package. If a microprocessor voltage supervisor with an open-drain output stage is needed, see MIC6315. Datasheets and support documentation are available 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 1V • 5μA typical supply current • 140ms minimum reset pulse width available • Manual reset input • Available in 4-pin SOT-143 package Applications • Portable equipment • Intelligent instruments • Critical microprocessor power monitoring • Printers/computers • Controllers Typical Application Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com September 9, 2014 Revision 2.0 Micrel, Inc. Ordering Information Part Number Pb-Free Marking(1) MIC811LUY KL MIC811MUY KM MIC811JUY KJ MIC811TUY KT MIC811SUY KS MIC811RUY KR MIC812LUY LL MIC812MUY LM MIC812JUY LJ MIC812TUY LT MIC812SUY LS MIC812RUY LR Note: 1. “_” underbar symbol not to scale Pin Configuration MIC811/812 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 Operating Temp. Range –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C Package 4-pin SOT-143 4-pin SOT-143 4-pin SOT-143 4-pin SOT-143 4-pin SOT-143 4-pin SOT-143 4-pin SOT-143 4-pin SOT-143 4-pin SOT-143 4-pin SOT-143 4-pin SOT-143 4-pin SOT-143 MIC811 4-Pin SOT-143 (U) MIC812 4-Pin SOT-143 (U) Pin Description MIC811 1 MIC812 1 2 N/A N/A 2 33 44 Pin Name GND /RESET RESET /MR VCC Pin Name 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. Manual Reset Input. A logic low on /MR will force a reset. The reset will remain asserted as long as /MR is held low and for one reset timeout period (140ms min.) after /MR goes high. This input can be shorted to ground via a switch or driven from CMOS or TTL logic. Float if unused. Power Supply Input. September 9, 2014 2 Revision 2.0 Micrel, Inc. MIC811/812 Absolute Maximum Ratings(2) Terminal Voltage (VCC) ................................ -0.3V to +6.0V Input Current (VCC, /MR)............................................20mA Output Current (/RESET, RESET) ..............................20mA Lead Temperature (soldering, 10s)............................ 300°C Storage Temperature (Ts)............................... 5°C to 150°C Rate of Rise (VCC) .................................................100V/µs ESD Rating(4).................................................................. 3kV Operating Ratings(3) Operating Temperature Range MIC811 ................................................. –40°C to +85°C MIC812 ................................................. –40°C to +85°C Power Dissipation (TA = +70°C) ...............................320mW Thermal Resistance SOT-143 (θJA) ..................................................265°C/W Electrical Characteristics(5) For typical values, VCC = 5V for MIC8_L/M/J, VCC = 3.3V for MIC8_S/T, VCC = 3V for MIC8_R; TA = 25°C, bold values indicate – 40°C to ≤ TA ≤ +85°C; unless noted. Symbol Parameter Condition Min Typ Max Units VCC Operating Voltage Range TA = –40°C to 85°C MIC811L/M/J, MIC812L/M/J: VCC = 5.0V, no load 1 5.5 V 5 15 µA IVCC Supply Current MIC811S/T, MIC812S/T: VCC = 3.3V, no load 5 10 µA MIC811R, MIC812R: VCC = 3.0V, no load 5 10 µA MIC811L, MIC812L 4.50 4.63 4.75 V MIC811M, MIC812M 4.25 4.38 4.50 V MIC811J, MIC812J VTH Reset Voltage Threshold MIC811T, MIC812T 3.89 4.00 3.00 3.08 4.10 3.15 V V MIC811S, MIC812S 2.85 2.93 3.00 V MIC811R, MIC812R 2.55 2.63 2.70 V tRST Reset Timeout Period 140 240 560 ms ISOURCE = 800µA, MIC811L/M/J VOH /RESET Output Voltage ISOURCE = 500µA, MIC811R/S/T VCC–1.5V 0.8xVCC V V VCC = VTH min.,.


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