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MAX6468 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX6468 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 9 page General Description The MAX6467/MAX6468 microprocessor (µP) supervi- sory circuits monitor single power-supply voltages from +1.8V to +5.0V and assert a reset if the supply voltage drops below its preset threshold. An edge-triggered, one-shot manual reset function ensures that the µP enters the reset mode for a fixed timeout period only, even in the event of a continuously asserted manual reset. The MAX6467/MAX6468 significantly improve system reliability compared to traditional manual reset supervisory circuits. A variety of factory-trimmed threshold options accommo- date different supply voltages and tolerances, eliminating external components. The factory-set thresholds range from +1.575V to +4.625V to monitor +5.0V, +3.3V, +3.0V, +2.5V, and +1.8V supplies with various tolerances. Reset timeout periods of 150ms (min) and 1200ms (min) are available to accommodate different µP platforms. A single, active-low RESET output asserts when VCC drops below its threshold or if the edge-triggered MR asserts low. RESET remains low for the reset timeout period after VCC rises above its threshold and for a fixed, one-shot timeout period after a manual reset input falling edge. RESET remains valid as long as VCC remains above +1V. Open-drain (MAX6467) and push-pull (MAX6468) output options provide additional flexibility in the system design. The MAX6467/MAX6468 are offered in the space-saving 4-pin SOT143 package and the ultra-small 4-pin SC70 package and are specified over the automotive (-40°C to +125°C) temperature range. Applications Cell Phones/PDAs Embedded Control Systems Industrial Equipment Automotive Products Portable/Battery-Powered Equipment Medical Devices DSL Modems MP3 Players GPS Systems Digital Cameras Features o Precision Factory-Set Reset Threshold Voltages for +5.0V, +3.3V, +3.0V, +2.5V, and +1.8V Supplies o Edge-Triggered Manual Reset Input with One- Shot Pulsed Reset Output o Two Reset Timeout Period Options (150ms or 1200ms min) o Immune to Short Voltage Transients o Low Supply Current (3µA at VCC = +1.8V) o RESET Valid to VCC = +1V o Active-Low Open-Drain and Push-Pull RESET Output Options o -40°C to +125°C Operating Temperature Range o Small 4-Pin SC70 and SOT143 Packages o No External Components Required o Pin Compatible with MAX811, MAX6315, MAX6384, and MAX6386 Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset ________________________________________________________________ Maxim Integrated Products 1 Ordering Information 19-2523; Rev 0; 7/02 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Typical Operating Circuit appears at end of data sheet. PART TEMP RANGE PIN-PACKAGE MAX6467XS_ _D_-T -40°C to +125°C 4 SC70-4 MAX6467US_ _D_-T -40°C to +125°C 4 SOT143-4 MAX6468XS_ _D_-T -40°C to +125°C 4 SC70-4 MAX6468US_ _D_-T -40°C to +125°C 4 SOT143-4 Note: Insert reset threshold suffix (see Reset Threshold table) after XS or US. Insert reset timeout delay (see Reset Timeout Delay table) after D to complete the part number. Sample stock is generally held on standard versions only (see Standard Versions table). Standard versions have an order increment requirement of 2500 pieces. Nonstandard versions have an order increment requirement of 10,000 pieces. Contact factory for availability. Pin Configurations continued at end of data sheet. 1 2 4 3 VCC GND SC70 TOP VIEW MAX6467XS MAX6468XS RESET MR Pin Configurations |
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