Details, datasheet, quote on part number: MAX6340UK29-T
CategoryPower Management => Supervisory Circuits => Microprocessor Supervisors
DescriptionMAX6340, MAX6421, MAX6422, MAX6423, MAX6424, MAX6425, MAX6426 Low-Power, SC70/SOT µP Reset Circuits With Capacitor-adjustable Reset Timeout Delay
CompanyMaxim Integrated Products
DatasheetDownload MAX6340UK29-T datasheet
Cross ref.Similar parts: TPS6735
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Features, Applications

Low-Power, SC70/SOT P Reset Circuits with Capacitor-Adjustable Reset Timeout Delay

The MAX6340/MAX6421MAX6426 low-power microprocessor supervisor circuits monitor system voltages from to 5V. These devices perform a single function: they assert a reset signal whenever the VCC supply voltage falls below its reset threshold. The reset output remains asserted for the reset timeout period after VCC rises above the reset threshold. The reset timeout is externally set by a capacitor to provide more flexibility. The MAX6421/MAX6424 have an active-low, pushpull reset output. The MAX6422 has an active-high, push-pull reset output and the MAX6340/MAX6423/ MAX6425/MAX6426 have an active-low, open-drain reset output. The MAX6421/MAX6422/MAX6423 are offered or SOT143 packages. The MAX6340/MAX6424/MAX6425/MAX6426 are available 5-pin SOT23-5 packages.


o Monitor System Voltages from 5V o Capacitor-Adjustable Reset Timeout Period o Low Quiescent Current (1.6A typ) o Three RESET Output Options Push-Pull RESET Push-Pull RESET Open-Drain RESET o Guaranteed Reset Valid to VCC 1V o Immune to Short VCC Transients o Small 4-Pin SOT143, and 5-Pin SOT23 Packages o MAX6340 Pin Compatible with o MAX6424/MAX6425 Pin Compatible with MC33464/MC33465, S807/S808/S809, and o MAX6426 Pin Compatible with PST92XX


Portable Equipment Battery-Powered Computers/Controllers Automotive Medical Equipment Intelligent Instruments Embedded Controllers Critical P Monitoring Set-Top Boxes Computers

Note: The MAX6340/MAX6421MAX6426 are available with factory-trimmed reset thresholds from 5.0V in approximately 0.1V increments. Insert the desired nominal reset threshold suffix (from Table 1) into the blanks. There are 50 standard versions with a required order increment of 2500 pieces. Sample stock is generally held on standard versions only (see Standard Versions Table). Required order increment is 10,000 pieces for nonstandard versions. Contact factory for availability. All devices are available in tape-and-reel only. Typical Operating Circuit appears at end of data sheet. Selector Guide appears at end of data sheet. 1

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

All Voltages Referenced to GND to +6.0V SRT, RESET, RESET (push-pull).................-0.3V to (VCC + 0.3V) RESET (open to +6.0V Input Current (all pins)......................................................20mA Output Current (RESET, RESET)......................................20mA Continuous Power Dissipation (TA 4-Pin SC70 (derate 3.1mW/C above 4-Pin SOT143 (derate 4mW/C above 5-Pin SOT23 (derate 7.1mW/C above +70C)............571mW Operating Temperature to +125C Storage Temperature to +150C Junction Temperature......................................................+150C Lead Temperature (soldering, 10s).................................+300C

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

(VCC TA = TMIN to TMAX, unless otherwise specified. Typical values are at VCC = 5V and = +25C.) (Note 1)

PARAMETER Supply Voltage Range Supply Current SYMBOL VCC 5.0V ICC VCC 3.3V VCC 2.0V VCC Reset Threshold Accuracy Hysteresis VCC to Reset Delay Reset Timeout Period VSRT Ramp Current VSRT Ramp Threshold RAMP Threshold Hysteresis RESET Output Voltage Low VOL VTH VHYST tRD tRP IRAMP VTH-RAMP VCC falling at 1mV/s CSRT = 1500pF CSRT = 0 VSRT to 0.65V; VCC to 5V VCC to 5V (VRAMP rising) VRAMP falling threshold VCC 1.0V, ISINK = 50A VCC 2.7V, ISINK = 1.2mA VCC 4.5V, ISINK = 3.2mA RESET Output Voltage High, Push-Pull RESET Output Leakage Current, Open-Drain VCC 1.8V, ISOURCE = 200A VOH VCC 2.25V, ISOURCE = 500A VCC 4.5V, ISOURCE = 800A ILKG VCC > VTH, reset not asserted VCC 1.0V, ISOURCE = 1A RESET Output Voltage High VOH VCC 1.8V, ISOURCE = 150A VCC 2.7V, ISOURCE = 500A VCC 4.5V, ISOURCE = 800A VCC 1.8V, ISINK = 500A RESET Output Voltage Low VOL VCC 2.7V, ISINK = 1.2mA VCC 4.5V, ISINK 0.8 x VCC 0.8 x VCC 0.8 x VCC 0.8 x VCC 0.8 x VCC 0.8 x VCC 0.8 x VCC to +125C VTH - 1.5% VTH V 5.75 CONDITIONS MIN TYP MAX VTH + 1.5% VTH mV A UNITS V

Note 1: Devices production tested at +25C. Overtemperature limits are guaranteed by design.


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