MAX6805US26D3-T中文资料

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19-1946; Rev 1; 2/01

4-Pin, Low-Power

µP Reset Circuits with Manual Reset

General Description

Features

The MAX6803/MAX6804/MAX6805 microprocessor (µP)supervisory circuits monitor the power supplies in 2.85VoUltra-Low 0.7V Operating Supply Voltage

to 5.0V µP and digital systems. They increase circuitoLow 4.0µA Supply Current

reliability and reduce cost by eliminating external com-ponents and adjustments. They also feature aoPrecision Monitoring of 2.85V to 5.0V Power-debounced manual reset input.

Supply Voltages

These devices perform a single function: they assert aoReset Thresholds Available from 2.63V to 4.80V,reset signal whenever the Vin Approximately 100mV Incrementsbelow a preset threshold or whenever manual reset isCCsupply voltage declinesoDebounced Manual Reset Inputasserted. Reset remains asserted for a preset timeoutperiod after VoFully Specified over Temperature

CChas risen above the reset threshold orafter manual reset is deasserted. The only differenceoThree Power-On Reset Timeout Periods Availableamong the three devices is their output. The MAX6804(1ms min, 20ms min, 100ms min)(push/pull) and MAX6805 (open-drain) have an active-oLow Cost

low RESEToutput, while the MAX6803 (push/pull) hasan active-high RESET output. The MAX6803/MAX6804oThree Available Output Structures: Push/Pull are guaranteed to be in the correct state for VCCdownRESET, Push/Pull RESET, Open-Drain RESETto 0.7V. The MAX6805 is guaranteed to be in the cor-oGuaranteed RESET/RESETValid to VCC= 0.7Vrect state for VCCdown to 1.0V.

(MAX6803/MAX6804)

The reset comparator in these ICs is designed to ignorefast transients on VoPower-Supply Transient Immunitytrimmable between 2.63V and 4.80V, in approximatelyCC. Reset thresholds are factory-oNo External Components Required100mV increments. These devices are available with ao4-Pin SOT143 Package

1ms min, 20ms min, or 100ms min reset timeout period.Ideal for space-critical applications, the MAX6803/oPin Compatible with MAX811/MAX812 andMAX6804/MAX6805 come packaged in a 4-pinMAX6314/MAX6315

SOT143. For a lower threshold voltage version, see theMAX6335/MAX6336/MAX6337.

ComputersControllers

Intelligent Instruments

Critical µP/µC Power MonitoringPortable/Battery-Powered Equipment*These devices are available in factory-set VCCreset thresh-Automotive

olds from 2.63V to 4.80V, in approximately 0.1V increments.Choose the desired reset threshold suffix from Table 1 andinsert it in the blanks following “US” in the part number.Factory-programmed reset timeout periods are also available.Insert the number corresponding to the desired nominal resettimeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) inthe blank following “D” in the part number. There are 15 stan-dard versions with a required order increment of 2500 pieces.Sample stock is generally held on the standard versions onlyTypical Operating Circuit and Pin Configuration appear(see Selector Guide). Contact the factory for availability of non-at end of data sheet.

standard versions (required order increment is 10,000 pieces).All devices available in tape-and-reel only.

Selector Guide appears at end of data sheet.

________________________________________________________________Maxim Integrated Products1

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

MAX6803/MAX6804/MAX6805

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