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Technical content

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. MIC811/812

Ordering Information

Pb-Free Marking(1) Threshold Voltage Operating Temp. Range Package MIC811LUY KL 4.63 –40°C to +85°C 4-pin SOT-143 MIC811MUY KM 4.38 –40°C to +85°C 4-pin SOT-143 MIC811JUY KJ 4.00 –40°C to +85°C 4-pin SOT-143 MIC811TUY KT 3.08 –40°C to +85°C 4-pin SOT-143 MIC811SUY KS 2.93 –40°C to +85°C 4-pin SOT-143 MIC811RUY KR 2.63 –40°C to +85°C 4-pin SOT-143 MIC812LUY LL 4.63 –40°C to +85°C 4-pin SOT-143 MIC812MUY LM 4.38 –40°C to +85°C 4-pin SOT-143 MIC812JUY LJ 4.00 –40°C to +85°C 4-pin SOT-143 MIC812TUY LT 3.08 –40°C to +85°C 4-pin SOT-143 MIC812SUY LS 2.93 –40°C to +85°C 4-pin SOT-143 MIC812RUY LR 2.63 –40°C to +85°C 4-pin SOT-143 Note: 1. “_” underbar symbol not to scale Pin Configuration MIC811 4-Pin SOT-143 (U) MIC812 4-Pin SOT-143 (U) Pin Description MIC811 MIC812 Pin Name Pin Name 1 1 GND IC Ground Pin.

2 N/A /RESET

/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. N/A 2 RESET 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. 3 3 /MR 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. 4 4 VCC Power Supply Input. September 9, 2014 2 Revision 2.0

Micrel, Inc. MIC811/812 Absolute Maximum Ratings(2) Operating Ratings(3) Operating Temperature Range Thermal Resistance 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 1 5.5 V IVCC Supply Current MIC811L/M/J, MIC812L/M/J: VCC = 5.0V, no load 5 15 µA MIC811S/T, MIC812S/T: VCC = 3.3V, no load 5 10 µA MIC811R, MIC812R: VCC = 3.0V, no load 5 10 µA VTH Reset Voltage Threshold MIC811L, MIC812L 4.50 4.63 4.75 V MIC811M, MIC812M 4.25 4.38 4.50 V MIC811J, MIC812J 3.89 4.00 4.10 V MIC811T, MIC812T 3.00 3.08 3.15 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 VOH /RESET Output Voltage ISOURCE = 800µA, MIC811L/M/J VCC–1.5V V ISOURCE = 500µA, MIC811R/S/T 0.8xVCC V VOL /RESET Output Voltage VCC = VTH min., ISINK = 3.2mA, MIC811L/M/J 0.4 V VCC = VTH min., ISINK = 1.2mA, MIC811R/S/T 0.3 V VCC >1V, ISINK = 50µA, TA = –40°C to +85°C 0.3 V VOH RESET Output Voltage 1.8V <VCC <VTH min., ISOURCE = 150µA 0.8xVCC V VOL RESET Output Voltage ISINK = 3.2mA, MIC812L/M/J 0.4 V ISINK = 1.2mA, MIC812R/S/T 0.3 V Notes: 2. Exceeding the absolute maximum ratings may damage the device. 3. The device is not guaranteed to function outside its operating ratings. 5. Specification for packaged product only September 9, 2014 3 Revision 2.0

Micrel, Inc. MIC811/812 Electrical Characteristics (Continued)(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 /MR Minimum Pulse Width 10 µs /MR to Reset Delay 0.5 µs VIH /MR Input Threshold VCC > VTH max., MIC81_L/M/J 2.3 V MIC81_R/S/T 0.7xVCC V VIL /MR Input Threshold VCC > VTH max., MIC81-L/M/J 0.8 V MIC81_R/S/T 0.25xVCC V /MR Pull-Up Resistance 10 20 30 kΩ /MR Glitch Immunity 100 ns Timing Diagram Reset Timing Diagram Functional Diagram September 9, 2014 4 Revision 2.0

Micrel, Inc. MIC811/812

Application Information

The /RESET (or RESET) pin is asserted whenever V CC falls below the reset threshold voltage. The /RESET pin remains asserted for a period of 140ms after V CC has risen above the reset threshold voltage. The reset function ensures that 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 1V. VCC Transients The MIC811/812 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 20μs or less will not cause a reset. Interfacing to Bidirectional Reset Pins The MIC811/812 can interface with µPs with bidirectional reset pins by connecting a 4.7k Ω resistor in series with the MIC811/812 output and the µP 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 V CC down to 0V. A 100k Ω resistor connected from the /RESET to ground is recommended. The size of the resistor should be large enough not to load the output excessively and small enough to pull-down any stray leakage currents. Reset Valid to VCC = 0V September 9, 2014 5 Revision 2.0

Micrel, Inc. MIC811/812

Package Information

4-Pin SOT-143 (U) September 9, 2014 6 Revision 2.0

Micrel, Inc. MIC811/812 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, Inc. is a leading global manufacturer of IC solutions for the worldwide high performance linear and power, LAN, and timing & communications markets. The Company’s products include advanced mixed-signal, analog & power semiconductors; high- performance communication, clock management, MEMs-based clock oscillators & crystal-less clock generators, Ethernet switches, and physical layer transceiver ICs. Company customers include leading manufacturers of enterprise, consumer, industrial, mobile, telecommunications, automotive, and computer products. Corporation headquarters and state-of-the-art wafer fabrication facilities are located in San Jose, CA, with regional sales and support offices and advanced technology design centers situated throughout the Americas, Europe, and Asia. Additionally, the Company maintains an extensive network of distributors and reps worldwide. Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this datasheet. 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.” © 2014 Micrel, Incorporated. September 9, 2014 7 Revision 2.0