MAX6802UR38D1-T Maxim Integrated, MAX6802UR38D1-T Datasheet

MAX6802UR38D1-T

Manufacturer Part Number

MAX6802UR38D1-T

Description

Supervisory Circuits

Manufacturer

Maxim Integrated

Series

MAX6800, MAX6801, MAX6802r

Datasheet

1.MAX6802UR41D3-T.pdf (7 pages)

Specifications of MAX6802UR38D1-T

Number Of Voltages Monitored

Monitored Voltage

2.85 V to 5 V

Undervoltage Threshold

3.732 V

Overvoltage Threshold

3.868 V

Output Type

Active Low, Open Drain

Manual Reset

Not Resettable

Watchdog

No Watchdog

Battery Backup Switching

No Backup

Power-up Reset Delay (typ)

2 ms

Supply Voltage - Max

5.5 V

Maximum Operating Temperature

+ 125 C

Mounting Style

SMD/SMT

Package / Case

SOT-23

Chip Enable Signals

Maximum Power Dissipation

320 mW

Minimum Operating Temperature

- 40 C

Power Fail Detection

Supply Current (typ)

5 uA

Supply Voltage - Min

1 V

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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 com-

ponents and adjustments.

These devices perform a single function—they assert a

reset signal whenever the V

below a preset threshold, keeping it asserted for a preset

timeout period after V

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 MAX6800/MAX6801 are guaranteed to be in the cor-

rect state for V

teed to be in the correct state for V

The reset comparator in these ICs is designed to ignore

fast transients on V

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.

19-1933; Rev 4; 3/12

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 Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Computers

Controllers

Intelligent Instruments

Critical µP/µC Power Monitoring

Portable/Battery-Powered Equipment

Automotive

down to 0.7V. The MAX6802 is guaran-

________________________________________________________________ Maxim Integrated Products

. Reset thresholds are factory-

General Description

has risen above the reset

supply voltage declines

Applications

down to 1.0V.

o Ultra-Low 0.7V Operating Supply Voltage

o Low 4.0µA Supply Current

o Precision Monitoring of 2.85V to 5.0V Power-

o Reset Thresholds Available from 2.63V to 4.80V,

o Fully Specified over Temperature

o Three Power-On Reset Timeout Periods Available

o Low Cost

o Three Available Output Structures: Push/Pull

o Guaranteed RESET/RESET Valid to V

o Power-Supply Transient Immunity

o No External Components Required

o 3-Pin SOT23 Package

o Pin Compatible with MAX809/MAX810,

* These devices are available in factory-set V

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 “UR” 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.

Devices are available in both leaded and lead-free packaging.

Specify lead-free by replacing “-T” with “+T” when ordering.

/V Denotes an automotive-qualified part.

MAX6800UR_ _D_-T

MAX6800UR_ _D_/V-T

MAX6801UR_ _D_-T

MAX6801UR_ _ D_/V-T

MAX6802UR_ _D_-T

MAX6802UR_ _ D_/V-T

Supply Voltages

in Approximately 100mV Increments

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

RESET, Push/Pull RESET, Open-Drain RESET

(MAX6800/MAX6801)

MAX6326/MAX6327/MAX6328, and

MAX6346/MAX6347/MAX6348

PART

µP Reset Circuits

3-Pin, Low-Power

Ordering Information

-40°C to +125°C

TEMP RANGE

Features

PIN- PA CK A G E

3 SOT23

reset thresh-

= 0.7V

Related parts for MAX6802UR38D1-T

MAX6802UR38D1-T Summary of contents

Page 1

... Typical Operating Circuit and Pin Configuration appear at end of data sheet. Selector Guide appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. o Ultra-Low 0.7V Operating Supply Voltage o Low 4.0µ ...

Page 2

Low-Power µP Reset Circuits ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) V ......................................................................-0.3V to +6V CC Push/Pull RESET, RESET .......................-0. Open-Drain RESET ..............................................-0.3V to +6V Input Current (V ) .............................................................20mA CC Output Current (RESET, RESET).........................................20mA ...

Page 3

T = +25°C, unless otherwise noted.) A SUPPLY CURRENT vs. TEMPERATURE 6.5 6.0 5 +5.0V CC 5.0 4 +3.3V CC 4.0 3.5 3.0 -50 - 100 TEMPERATURE (°C) RESET ...

Page 4

Low-Power µP Reset Circuits Applications Information Interfacing to µPs with Bidirectional Since the RESET output on the MAX6802 is open-drain, this device interfaces easily with µPs that have bidirec- tional reset pins, such as the Motorola 68HC11. Connecting the ...

Page 5

Ensuring a Valid Reset Output Down to V When V falls below 1V and approaches the minimum CC operating voltage of 0.7V, push/pull-structured reset sinking (or sourcing) capabilities decrease drastically. High-impedance CMOS-logic inputs connected to the RESET pin can drift ...

Page 6

Low-Power µP Reset Circuits PART OUTPUT STAGE MAX6800UR26D3-T Push/Pull RESET MAX6800UR29D3-T Push/Pull RESET MAX6800UR31D3-T Push/Pull RESET MAX6800UR44D3-T Push/Pull RESET MAX6800UR46D3-T Push/Pull RESET Push/Pull RESET MAX6801UR26D3-T Push/Pull RESET MAX6801UR29D3-T Push/Pull RESET MAX6801UR31D3-T Push/Pull RESET MAX6801UR44D3-T Push/Pull RESET MAX6801UR46D3-T Open-Drain RESET ...

Page 7

... Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. 7 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2012 Maxim Integrated Products 3-Pin, Low-Power µ ...

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