Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6802 Datasheet

Low-Power uP Reset Circuits

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MAX6800/MAX6801/

MAX6802

3-Pin, Low-Power

μP Reset Circuits

General Description

The MAX6800/MAX6801/MAX6802 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 components and

adjustments.

These devices perform a single function—they assert a

reset signal whenever the VCC supply voltage declines

below a preset threshold, keeping it asserted for a preset

timeout period after VCC has risen above the reset

threshold. The only difference among the three devices

is their output. The MAX6801 (push/pull) and MAX6802

(open-drain) have an active-low RESET output, while the

MAX6800 (push/pull) has an active-high RESET output.

The devices are guaranteed to be in the correct state for

VCC down to 0.7V. The MAX6802 is guaranteed to be in

the correct state for VCC down to 1.0V.

The reset comparator in these ICs is designed to ignore

fast transients on VCC. Reset thresholds are factory-

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 pulse

width. Ideal for space-critical applications, the MAX6800/

MAX6801/MAX6802 come packaged in a 3-pin SOT23.

For a lower threshold voltage version, see the MAX6332/

MAX6333/MAX6334.

Applications

●● Computers

●● Controllers

●● Intelligent Instruments

●● Critical μP/μC Power Monitoring

●● Portable/Battery-Powered Equipment

Selector Guide (Standard Versions*) appears at end of data sheet.

Benefits and Features

●● Ultra-Low 0.7V Operating Supply Voltage

●● Low 4.0μA Supply Current

●● Precision Monitoring of 2.85V to 5.0V Power-

Supply Voltages

●● Reset Thresholds Available from 2.63V to 4.80V, in

Approximately 100mV Increments

●● Fully Specified over Temperature

●● Three Power-On Reset Timeout Periods Available

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

●● Low Cost

●● Three Available Output Structures: Push/Pull

RESET, Push/Pull RESET, Open-Drain RESET

●● Guaranteed RESET/RESET Valid to VCC = 0.7V

(MAX6800/MAX6801)

●● Power-Supply Transient Immunity

●● No External Components Required

●● 3-Pin SOT23 Package

●● Pin-Compatible with MAX809/MAX810,

MAX6326/MAX6327/MAX6328, and

MAX6346/MAX6347/MAX6348

Typical Operating Circuit

VCC

MAX6801

RESET

VCC

µP

RESET

GND GND

19-1933; Rev 5; 2/16

Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6802 Datasheet

Low-Power uP Reset Circuits

No Preview Available !

MAX6800/MAX6801/

MAX6802

3-Pin, Low-Power

μP Reset Circuits

Absolute Maximum Ratings

Terminal Voltage (with respect to GND)

VCC.......................................................................-0.3V to +6V

Push/Pull RESET, RESET..................... -0.3V to (VCC + 0.3V)

Open-Drain RESET..............................................-0.3V to +6V

Input Current (VCC).............................................................20mA

Output Current (RESET, RESET).......................................20mA

Continuous Power Dissipation (TA = +70°C)

3-Pin SOT23 (derate 4mW/°C above +70°C)..............320mW

Operating Temperature Range.......................... -40°C to +125°C

Junction Temperature.......................................................+150°C

Storage Temperature Range............................. -65°C to +150°C

Lead Temperature (soldering, 10s).................................. +300°C

Soldering Temperature (reflow)........................................ +300°C

Lead (Pb)-free packages..............................................+260°C

Package containing lead (Pb)......................................+240°C

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.

Electrical Characteristics

(VCC = full range, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VCC = +5.0V and TA = +25°C, reset not

asserted.) (Note 1)

PARAMETER

Supply Voltage Range

(Note 2)

Supply Current

Reset Threshold

SYMBOL

VCC

ICC

CONDITIONS

TA = 0°C to +125°C

MAX6800/MAX6801

MAX6802

TA = -40°C to +125°C

MAX6800/MAX6801

MAX6802

No load

VCC = +3.0V

VCC = +5.0V

VTH

MAX680_UR_ _D_-T, TA = +25°C

Table 1

TA = -40°C to +125°C

MIN

0.7

1.0

0.78

1.2

VTH

- 1.8%

VTH

- 3%

TYP

VTH

MAX

5.5

VTH

+ 1.8%

VTH

+ 3%

UNITS

µA

VCC Falling Reset Delay

VCC falling at 10V/ms

MAX680_UR_ _D1-T

30 µs

1 1.5 2

Reset Active Timeout Period

tRP MAX680_UR_ _D2-T

MAX680_UR_ _D3-T

20 30 40 ms

100 150 200

RESET Output Low-Voltage

(MAX6801/MAX6802)

VOL

Reset

asserted

ISINK = 50µA, VCC ≥ 1.0V

ISINK = 1.2mA, VCC ≥ 2.5V

ISINK = 1.2mA, VCC ≥ 4.25V

0.4

0.3 V

0.4

RESET Output High-Voltage

(MAX6801)

VOH

Reset not

asserted

ISOURCE = 500µA, VCC ≥ 3.0V

ISOURCE = 800µA, VCC ≥ 5.0V

0.8 x VCC

RESET Output Voltage

(MAX6800)

VOH

VOL

Reset

asserted

Reset not

asserted

ISOURCE = 1µA, VCC ≥ 1.0V

ISOURCE = 200µA, VCC ≥ 1.8V

ISOURCE = 800µA, VCC ≥ 4.25V

ISINK = 1.2mA, VCC ≥ 3.0V

ISINK = 3.2mA, VCC ≥ 5.0V

0.8 x VCC

0.3

0.4

RESET Output Leakage Current

(MAX6802)

VCC > VTH, RESET not asserted

0.5 µA

Note 1: All parts are production tested at TA = +25°C. Overtemperature limits are guaranteed by design and not production tested.

Note 2: ISOURCE for the MAX6800 is 100nA. ISINK for the MAX6801 is 100nA. ISINK for the MAX6802 is 50μA.

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MAX6802 Datasheet

Low-Power uP Reset Circuits

MAX6802 Datasheet

Low-Power uP Reset Circuits

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