Features: ` Precision Factory-Set Reset Threshold Voltages or +5.0V, +3.3V, +3.0V, +2.5V, and +1.8V Supplies
` Edge-Triggered Manual Reset Input with One- hot Pulsed Reset Output
` Two Reset Timeout Period Options (150ms or 200ms min)
` Immune to Short Voltage Transients
` Low Supply Current (3A at VCC = +1.8V)
` RESET Valid to VCC = +1V
` Active-Low Open-Drain and Push-Pull RESETOutput Options
` -40°C to +125°C Operating Temperature Range
` Small 4-Pin SC70 and SOT143 Packages
` No External Components Required
` Pin Compatible with MAX811, MAX6315, AX6384, and MAX6386Application·Cell Phones/PDAs
·Embedded Control Systems
·Industrial Equipment
·Automotive Products
·Portable/Battery-Powered Equipment
·Medical Devices
·DSL Modems
·MP3 Players
·GPS Systems
·Digital CamerasPinout
SpecificationsVCC to GND.........................................................-0.3V to +6.0V
RESET to GND
Open-Drain.........................................................-0.3V to +6.0V
Push-Pull...................................................-0.3V to (VCC + 0.3V)
MR to GND .................................................-0.3V to (VCC + 0.3V)
Input/Output Current (all pins) .........................................20mA
Continuous Power Dissipation (TA = +70)
4-Pin SC70 (derate 3.1mW/ above +70)..................245mW
4-Pin SOT143 (derate 4mW/ above +70).................320mW
Operating Temperature Range .........................-40 to +125
Storage Temperature Range .............................-65 to +150
Junction Temperature......................................................+150
Lead Temperature (soldering, 10s) .................................+300
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional peration of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to bsolute maximum rating conditions for extended periods may affect device reliability.
DescriptionThe MAX6467/MAX6468 microprocessor (P) supervisory ircuits monitor single power-supply voltages from 1.8V to +5.0V and assert a reset if the supply voltage rops below its preset threshold. An edge-triggered, ne-shot manual reset function of MAX6468 ensures that the P nters the reset mode for a fixed timeout period only, ven in the event of a continuously asserted manual eset. The MAX6467/MAX6468 significantly improve ystem reliability compared to traditional manual reset upervisory circuits.
A variety of factory-trimmed threshold options of MAX6468 accommodate ifferent supply voltages and tolerances, eliminating xternal components. The factory-set thresholds range rom +1.575V to +4.625V to monitor +5.0V, +3.3V, +3.0V, 2.5V, and +1.8V supplies with various tolerances. Reset imeout periods of 150ms (min) and 1200ms (min) are vailable to accommodate different P platforms.
A single, active-low RESET output of MAX6468 asserts when VCC rops below its threshold or if the edge-triggered MR sserts low. RESET remains low for the reset timeout eriod after VCC rises above its threshold and for a fixed, ne-shot timeout period after a manual reset input falling dge. RESET remains valid as long as VCC remains bove +1V. Open-drain (MAX6467) and push-pull MAX6468) output options provide additional flexibility in he system design.
The MAX6467/MAX6468 are offered in the space-saving -pin SOT143 package and the ultra-small 4-pin SC70 ackage and are specified over the automotive (-40 to 125) temperature range.
MAX6468 Data Sheet
