19-1658; Rev 3; 12/05

with Battery Backup and Chip-Enable Gating

SOT23, Low-Power µP Supervisory CircuitsFeatures

The MAX6365–MAX6368 supervisory circuits simplifypower-supply monitoring, battery-backup control func- Low +1.2V Operating Supply Voltage (VCCor VBATT)tions, and memory write protection in microprocessor Precision Monitoring of +5.0V, +3.3V, +3.0V, and(µP) systems. The circuits significantly improve the size,+2.5V Power-Supply Voltages

accuracy, and reliability of modern systems with an ultra- On-Board Gating of Chip-Enable Signals, 1.5nssmall integrated solution.

Propagation Delay

These devices perform four basic system functions:

Debounced Manual Reset Input (MAX6365)1) Provide a µP reset output during V Watchdog Timer, 1.6s Timeout (MAX6366)up, power-down, and brownout http://supply power- Battery-On Output Indicator (MAX6367)

2) Internally control V Auxiliary User-Adjustable RESET IN (MAX6368)maintain data or low-power operation for CMOSCCto backup-battery switching to

Low 10µA Quiescent Supply CurrentRAM, CMOS µPs, real-time clocks, and other digital Three Available Output Structures

logic when the main supply fails.Push-Pull RESET3) Provide memory write protection through internal

Open-Drain RESETchip-enable gating during supply or processor faults.Open-Drain RESET

4) Include one of the following options: a manual reset

RESET/RESET Valid Down to 1.2V Guaranteedinput (MAX6365), a watchdog timer function(VCCor VBATT)

(MAX6366), a battery-on output (MAX6367), or anauxiliary user-adjustable reset input (MAX6368).

Power-Supply Transient ImmunityThe MAX6365–MAX6368 operate from V 150ms min Reset Timeout PeriodCCsupply volt-ages as low as 1.2V. The factory preset reset threshold Miniature 8-Pin SOT23 Package

voltages range from 2.32V to 4.63V (see the OrderingOrdering Information

Information). In addition, each part is offered in threereset output versions: push-pull active low, open-drainactive low, or open-drain active high (see the SelectorGuide). The MAX6365–MAX6368 are available in minia-ture 8-pin SOT23 packages.

Applications

Critical µP/µC Power Portable/Battery-Monitoring Powered EquipmentFax MachinesSet-Top BoxesIndustrial ControlPOS Equipment

Computers/Controllers

Pin Configurations

*These parts offer a choice of reset threshold voltages. From theReset Threshold Ranges table, insert the desired threshold volt-age code in the blank to complete the part number. SOT partscome in tape-and-reel only and must be ordered in 2500-pieceincrements. See Device Marking Codes for a complete parts list,including SOT top marks and standard threshold versions. SeeSelector Guide for a listing of device features.

Devices are available in both leaded and lead-free packaging.Specify lead-free by replacing “-T” with “+T” when ordering.Typical Operating Circuit appears at end of data sheet.

________________________________________________________________Maxim Integrated Products

1

For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at http://.

MAX6365–MAX6368

SOT23, Low-Power µP Supervisory Circuitswith Battery Backup and Chip-Enable Gating

MAX6365–MAX6368

ABSOLUTE MAXIMUM RATINGS

Terminal Voltages (with respect to GND)

VCC, BATT, OUT.......................................................-0.3V to +6VRESET(open drain), RESET (open drain)................-0.3V to +6VBATT ON, RESET(push-pull), RESET IN,

WDI, CEIN, CEOUT...........................-0.3V to (VOUT+ 0.3V)MR..............................................................-0.3V to (VCC+ 0.3V)Input Current

VCCPeak..............................................................................1AVCCContinuous.............................................................250mABATT Peak.....................................................................250mABATT Continuous.............................................................40mA

GND...............................................................................75mAOutput Current

OUT...............................Short-Circuit Protected for up to 10sRESET, RESET, BATT ON, CEOUT...............................20mAContinuous Power Dissipation (TA= +70°C)

8-Pin SOT23 (derate 8.75mW/°C above +70°C)........700mWOperating Temperature Range...........................-40°C to +85°CStorage Temperature Range.............................-65°C to +150°CJunction Temperature .....................................................+150°CLead Temperature (soldering, 10s).................................+300°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(V= +2.4V to +5.5V, V= +3.0V, CEIN = V, reset not asserted, T= -40°C to +85°C. Typical values are at T= +25°C,

with Battery Backup and Chip-Enable Gating

SOT23, Low-Power µP Supervisory CircuitsELECTRICAL CHARACTERISTICS (continued)

(VCC= +2.4V to +5.5V, VBATT= +3.0V, CEIN = VCC, reset not asserted, TA= -40°C to +85°C. Typical values are at TA= +25°C,

_______________________________________________________________________________________3

MAX6365–MAX6368

SOT23, Low-Power µP Supervisory Circuitswith Battery Backup and Chip-Enable GatingMAX6365–MAX6368

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