General Description

The MAX6803/MAX6804/MAX6805 microprocessor (µP)

supervisory circuits monitor the power supplies in 2.85V

to 5.0V µP and digital systems. They increase circuit

reliability and reduce cost by eliminating external com-

ponents and adjustments. They also feature a

debounced manual reset input.

These devices perform a single function: they assert a

below a preset threshold or whenever manual reset is

asserted. Reset remains asserted for a preset timeout

after manual reset is deasserted. The only difference

among the three devices is their output. The MAX6804

(push/pull) and MAX6805 (open-drain) have an active-

low RESET output, while the MAX6803 (push/pull) has

an active-high RESET output. The MAX6803/MAX6804

to 0.7V. The MAX6805 is guaranteed to be in the cor-

The reset comparator in these ICs is designed to ignore

trimmable between 2.63V and 4.80V, in approximately

100mV increments. These devices are available with a

1ms min, 20ms min, or 100ms min reset timeout period.

Ideal for space-critical applications, the MAX6803/

MAX6804/MAX6805 come packaged in a 4-pin

SOT143. For a lower threshold voltage version, see the

MAX6335/MAX6336/MAX6337.

Applications

Computers

Controllers

Intelligent Instruments

Critical µP/µC Power Monitoring

Portable/Battery-Powered Equipment

Automotive

Features

o Ultra-Low 0.7V Operating Supply Voltage

o Low 4.0µA Supply Current

o Precision Monitoring of 2.85V to 5.0V Power-

Supply Voltages

o Reset Thresholds Available from 2.63V to 4.80V,

in Approximately 100mV Increments

o Debounced Manual Reset Input

o Fully Specified over Temperature

o Three Power-On Reset Timeout Periods Available

(1ms min, 20ms min, 100ms min)

o Low Cost

o Three Available Output Structures: Push/Pull

RESET, Push/Pull RESET, Open-Drain RESET

(MAX6803/MAX6804)

o Power-Supply Transient Immunity

o No External Components Required

o 4-Pin SOT143 Package

o Pin Compatible with MAX811/MAX812 and

MAX6314/MAX6315

4-Pin, Low-Power

µP Reset Circuits with Manual Reset

________________________________________________________________ Maxim Integrated Products

1

19-1946; Rev 1; 2/01

PART*

MAX6803US_ _D_-T

MAX6804US_ _D_-T

MAX6805US_ _D_-T

-40°C to +125°C

-40°C to +125°C

-40°C to +125°C

TEMP. RANGE

PIN-PACKAGE

4 SOT143

4 SOT143

4 SOT143

Ordering Information

olds from 2.63V to 4.80V, in approximately 0.1V increments.

Choose the desired reset threshold suffix from Table 1 and

insert 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 reset

timeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) in

the 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 only

(see Selector Guide). Contact the factory for availability of non-

standard versions (required order increment is 10,000 pieces).

All devices available in tape-and-reel only.

Typical Operating Circuit and Pin Configuration appear

at end of data sheet.

Selector Guide appears at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.