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| MIC8114 Micrel MIC8114 Microprocessor Reset Circuit General Description The MIC8114 is an inexpensive microprocessor supervisory circuit that monitors the power supply in microprocessor based systems. The function of this device is to assert a reset if the power supply drops below a designated reset threshold level or /MR is forced low. The MIC8114 has an active low /RESET output. The reset output is guaranteed to remain asserted for a minimum of 790ms after VCC has risen above the designated reset threshold level. The MIC1814 comes in a 4-pin SOT-143 package. Features * * * * * * * * * * * * Precision voltage monitor for 3.3V power supplies Specifically tailored to the AMD Elan SC400/410 /RESET remains valid with VCC as low as 1V 5A typical supply current 790ms minimum reset pulse width Manual reset input Available in 4-Pin SOT-143 Package Portable equipment Intelligent instruments Critical microprocessor power monitoring Printers/computers Embedded controllers Applications Ordering Information Part Number MIC8114TU MIC8114TUY Marking NV NV Operating Temp. Range -40C to +85C -40C to +85C Package 4-lead SOT-143 4-lead SOT-143 Pb-Free No Yes Typical Application VCC VCC VCC MIC81 14 MR P RESET 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 July 2005 1 MIC8114 MIC8114 Micrel Pin Configuration GND 1 4 VCC MIC81 14 RESET 2 3 MR 4-Lead SOT-143 Pin Description Pin Number 1 2 Pin Name GND /RESET Pin Function IC Ground Pin /RESET goes low if either VCC falls below the supply reset threshold voltage or if /MR is asserted. /RESET remains asserted for one reset timeout period after both VCC exceeds the supply reset threshold voltage and /MR is deasserted. Manual Reset Input. A logic low on /MR forces a reset. The reset will remain asserted as long as /MR is held low and for one reset timeout period after /MR goes high. This input can be shorted to ground via a switch or driven from CMOS or TTL logic. Pulled high internally through a 20k resistor. Float if unused. Power supply Input. 3 /MR 4 VCC MIC8114 2 July 2005 MIC8114 Micrel Absolute Maximum Ratings(Note 1) Terminal Voltage (VCC) .........................................................-0.3V to +6.0V (/MR) ..................................................-0.3V (VCC + 0.3V) Input Current (VCC, /MR) ............................................ 20mA Output Current (/RESET) ........................................... 20mA Rate of Rise (VCC) ..................................................100V/S Lead Temperature (soldering, 10 sec.) ...................... 300C Storage Temperature (TS) ........................ -65C to +150C ESD Rating .................................................................... 3kV Operating Ratings(Note 2) Operating Temperature Range MIC8114TU ............................................ -40C to +85C Power Dissipation (TA = +70C) .............................. 320mW Electrical Characteristics For typical values, VCC = 3.3V; TA = 25C, bold values indicate -40C TA +85C; unless noted Symbol VCC ICC VTH Parameter Condition Operating Voltage Range Supply Current Reset Voltage Threshold Reset Timeout Period /RESET Output Voltage /RESET Output Voltage, VOL /MR Minimum Pulse Width /MR to Reset Delay /MR Input Threshold, VIH /MR Input Threshold, VIL /MR Pull-Up Resistance /MR Glitch Immunity Note 1. Note 2. Note 3. Exceeding the absolute maximum rating may damage the device. The device is not guaranteed to function outside its operating rating. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. Min 1 Typ 5 Max 5.5 15 3.15 1800 0.3 0.3 Units V A V ms V V V s s V TA = -40C to 85C 3.00 790 VCC = VTH min, ISINK = 1.2mA ISOURCE = 500A 0.8xVCC 3.08 1200 tRST VOH VOL VCC = 1V, ISINK = 50A, TA = -40C to +85C 10 0.5 0.7xVCC 10 20 100 0.25xVCC 30 k ns Timing Diagram VCC /MR VTH /RESET tRST tRST Reset Timing Diagram July 2005 3 MIC8114 MIC8114 Micrel Functional Diagram VCC MR (3) RESET GENERATOR RESET (2) VCC (4) + Reset Threshold (V) - GND (1) MIC8114 4 July 2005 MIC8114 Micrel /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 /RESET-to-ground is recommended. The resistor should be large enough not to load the /RESET output and small enough to pull-down any stray leakage currents VCC Applications Information Microprocessor Reset The /RESET pin is asserted whenever VCC falls below the reset threshold voltage. The reset pin remains asserted for a period of 790ms 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 1V. VCC Transients The MIC8114 is relatively immune to the 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 will not cause a reset. VCC VCC MIC81 14 RESET 100K P RESET /RESET Valid to VCC = 0V July 2005 5 MIC8114 MIC8114 Micrel Package Information 0.950 (0.0374) TYP 1.40 (0.055) 2.50 (0.098) 1.20 (0.047) 2.10 (0.083) C L C L DIMENSIONS: MM (INCH) 1.12 (0.044) 0.81 (0.032) 8 0 0.150 (0.0059) 0.089 (0.0035) 3.05 (0.120) 2.67 (0.105) 0.800 (0.031) TYP 0.400 (0.016) TYP 3 PLACES 0.10 (0.004) 0.013 (0.0005) 0.41 (0.016) 0.13 (0.005) 4-Lead SOT-143 (UT) TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com The information furnished by Micrel in this datasheet 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 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. MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA MIC8114 6 July 2005 |
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