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| MIC1810 Micrel MIC1810 Microprocessor Reset Circuit General Description The MIC1810 is an inexpensive microprocessor supervisory circuit that monitors 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 5%, 10%, or 15% drop in 5V powered systems. The MIC1810 has an active low /RESET output. The reset output is guaranteed to remain asserted for a minimum of 100ms after VCChas risen above the designated reset threshold level. The MIC1810 comes in a 3-pin SOT-23 package. Features * Precision voltage monitor for 5%, 10%, or 15% drop in 5V power supplies * /RESET remains valid with VCC as low as 1V * 5A supply current (typical) * 100ms minimum reset pulse width * No external components required * Available in 3-pin SOT-23 package Applications * * * * * Portable equipment Intelligent instruments Critical microprocessor power monitoring Printers/computers Embedded controllers Ordering Information Part Number MIC1810-5U MIC1810-10U MIC1810-15U MIC1810-5UY MIC1810-10UY MIC1810-15UY * Marking* NA NB NC NA NB NC Threshold Voltage 4.62V 4.37V 4.12V 4.62V 4.37V 4.12V Operating Temp. Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Package SOT-23 SOT-23 SOT-23 SOT-23 SOT-23 SOT-23 Pb-Free No No No Yes Yes Yes Underbar symbol may not be to scale Typical Application VCC VCC VCC MIC1810 RESET P 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 MIC1810 MIC1810 Micrel Pin Configuration RESET 1 MIC1810 VCC 2 3 GND 3-Lead SOT-23 Pin Description Pin Number 1 Pin Name /RESET Pin Function /RESET goes low if VCC falls below the reset threshold and remains asserted for one reset timeout period (100ms min) after VCC exceeds the reset threshold. Power supply input. IC ground pin 2 3 VCC GND MIC1810 2 July 2005 MIC1810 Micrel Absolute Maximum Ratings(Note 1) Terminal Voltage (VCC) ....................................-0.3V to +6V Input Current (VCC)..................................................... 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, Note 3 ....................................................... 3kV Operating Ratings(Note 2) Operating Temperature Range MIC1810-5U ........................................... -40C to +85C MIC1810-10U ......................................... -40C to +85C MIC1810-15U ......................................... -40C to +85C Power Dissipation (TA = +70C) .............................. 320mW Electrical Characteristics For typical values VCC = 5V, TA = 25C; bold values indicate -40C TA +85C; unless noted Symbol ICC Parameter Condition Operating Voltage Range Supply Current Reset Voltage Threshold VTH TA = -40C to +85C MIC1810-5 MIC1810-10 MIC1810-15 tRST VOH VOL Reset Timeout Period /RESET Output Voltage, High /RESET Output Voltage, Low ISOURCE = 800A VCC = VTH min., ISINK = 10mA VCC 1V, ISINK = 50A 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 20 4.75 4.50 4.24 250 0.4 0.3 Units V A V V V ms V V V 4.50 4.25 4.00 100 VCC-1.5 4.62 4.37 4.12 150 Note 1. Note 2. Note 3. Timing Diagram VCC VTH tRST VTH tRST /RESET Reset Timing Diagram July 2005 3 MIC1810 MIC1810 Micrel Functional Diagram VCC (2) + Reset Threshold (VTH) - RESET GENERATOR RESET (1) GND (3) MIC1810 4 July 2005 MIC1810 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. See Figure below. 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 tRST 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 MIC1810 is 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 will not cause an unwanted reset. VCC VCC MIC1810 RESET 100K P RESET /RESET Valid to VCC = 0V July 2005 5 MIC1810 MIC1810 Micrel Package Information C L 2.36 (0.093) 2.28 (0.090) 3.05 (0.120) 2.67 (0.105) C L 1.40 (0.055) 2.50 (0.098) 1.19 (0.047) 2.10 (0.083) 1.15 (0.045) 0.76 (0.030) DIMENSIONS : MM (INCH) 8 0 0.15 (0.006) 0.076 (0.0030) 0.445 (0.0175) TYP 3 PLACES 0.10 (0.004) 0.013 (0.0005) 0.41 (0.016) 0.13 (0.005) 3-Pin SOT-23 Small Outline Transistor 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 MIC1810 6 July 2005 |
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