MAX6468

Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset


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Description

The MAX6467/MAX6468 microprocessor (µP) supervisory 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 accommodate 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 active-low MR asserts low. Active-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. Active-low 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.
MAX6467, MAX6468: Functional Diagram MAX6467, MAX6468: Functional Diagram Enlarge+

Key Features

  • Precision Factory-Set Reset Threshold Voltages for +5.0V, +3.3V, +3.0V, +2.5V, and +1.8V Supplies
  • Edge-Triggered Manual Reset Input with One-Shot Pulsed Reset Output
  • Two Reset Timeout Period Options (150ms or 1200ms min)
  • Immune to Short Voltage Transients
  • Low Supply Current (3µA at VCC = +1.8V)
  • Active-Low RESET Valid to VCC = +1V
  • Active-Low Open-Drain and Push-Pull Active-Low RESET Output 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, MAX6384, and MAX6386
  • AEC-Q100 Qualified, Refer to Ordering Information for Specific /V Parts

Applications/Uses

  • Automotive Products
  • Cell Phones/PDAs
  • Digital Cameras
  • DSL Modems
  • Embedded Control Systems
  • Global Positioning Systems (GPS)
  • Industrial Equipment
  • Medical Devices
  • MP3 Players
  • Portable/Battery-Powered Equipment

See parametric specs for Resets and Supervisors with Pushbutton Manual Reset Inputs (13)


Part NumberMonitored VoltagesManual Reset FeatureMR1 Setup TimeReset Thresh.
(V)
Reset OuttRESETReset Thresh. Accur.
(%)
ICC
(µA)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX6467 1One-Shot1µs
1.2 to 1.79
1.8 to 2.49
2.5 to 3.29
3.3 to 4.99
Active Low
Open Drain
85ms to 300ms
>1s
1.513
-40 to +85
-40 to +125
0 to +70
SC70/4
SOT23/4
$1.17 @1k
MAX6468 
Active Low
Push-Pull
SC70/4
SOT23/4
$1.19 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

App Note 4624 Nonvolatile STANDBY/ON Switch
Product Reliability Reports: MAX6468.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Related Resources

Type ID Title
App Note 4624 Nonvolatile STANDBY/ON Switch