MAX6804US29D2+T - Maxim Integrated

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 cir-

cuit reliability and reduce cost by eliminating external

components and adjustments. They also feature a

debounced manual-reset input.

These devices perform a single function: they assert a

reset signal whenever the VCC supply voltage declines

below a preset threshold or whenever manual reset is

asserted. Reset remains asserted for a preset timeout

period after VCC has risen above the reset threshold or

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

are guaranteed to be in the correct state for VCC down

to 0.7V. The MAX6805 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 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

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

●Debounced Manual-Reset Input

●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

(MAX6803/MAX6804)

●Power-Supply Transient Immunity

●No External Components Required

●4-Pin SOT143 Package

●Pin Compatible with MAX811/MAX812 and

MAX6314/MAX6315(

*These devices are available in factory-set VCC reset thresh-

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.

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

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

PART* TEMP RANGE PIN-PACKAGE

MAX6803US_ _D_-T

-40°C to +125°C 4 SOT143

MAX6804US_ _D_-T

-40°C to +125°C 4 SOT143

MAX6805US_ _D_-T -40°C to +125°C 4 SOT143

MAX6803/MAX6804/

MAX6805

4-Pin, Low-Power

µP Reset Circuits with Manual Reset

19-1946; Rev 3; 7/14

Ordering Information

Selector Guide appears at end of data sheet.

Typical Operating Circuit and Pin Configuration appear

at end of data sheet.

Terminal Voltage (with respect to GND)

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

Push/Pull RESET or RESET, MR ........ -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)

4-Pin SOT143 (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

(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 SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage Range

(Note 1) VCC

TA = 0°C to +125°C MAX6803/MAX6804 0.7 5.5

MAX6805 1.0 5.5

TA = -40°C to +125°C MAX6803/MAX6804 0.78 5.5

MAX6805 1.2 5.5

Supply Current ICC No load VCC = +3.0V 4 10 µA

VCC = +5.0V 5 12

Reset Threshold VTH MAX680_US_ _D_-T,

Table 1

TA = +25°C VTH

- 1.8% VTH VTH

+ 1.8%

TA = -40°C to +125°C VTH

- 3% VTH VTH

+ 3%

VCC Falling Reset Delay VCC falling at 10V/ms 30 µs

Reset Active Timeout Period tRP

MAX680_US_ _D1-T 1 1.5 2

msMAX680_US_ _D2-T 20 30 40

MAX680_US_ _D3-T 100 150 200

MR Minimum Pulse Width 1 µs

MR Glitch Immunity 50 ns

MR Reset Delay 0.1 µs

MR Input Voltage VIL 0.3 × VCC V

VIH 0.7 × VCC

MR Pullup Resistance 12 20 30 kW

RESET Output Low Voltage

(MAX6804/MAX6805) VOL Reset

asserted

ISINK = 50µA, VCC ≥ 1.0V 0.4

VISINK = 1.2mA, VCC ≥ 2.5V 0.3

ISINK = 3.2mA, VCC ≥ 4.25V 0.4

RESET Output High Voltage

(MAX6804) VOH Reset not

asserted

ISOURCE = 500µA, VCC ≥ 3.0V 0.8 × VCC V

ISOURCE = 800µA, VCC ≥ 5.0V 0.8 × VCC

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MAX6803/MAX6804/

MAX6805

4-Pin, Low-Power

µP Reset Circuits with Manual Reset

Electrical Characteristics

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.

Absolute Maximum Ratings

(Reset not asserted, TA = +25°C, unless otherwise noted.)

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

Note 2: ISOURCE for the MAX6803 is 100nA; ISINK for the MAX6804 is 100nA; ISINK for the MAX6805 is 50µA.

(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 SYMBOL CONDITIONS MIN TYP MAX UNITS

RESET Output Voltage

(MAX6803)

VOH Reset

asserted

ISOURCE = 1µA, VCC ≥ 1.0V 0.8 × VCC

VISOURCE = 200µA, VCC ≥ 1.8V 0.8 × VCC

ISOURCE = 800µA, VCC ≥ 4.25V 0.8 × VCC

VOL Reset not

asserted

ISINK = 1.2mA, VCC ≥ 3.0V 0.3 V

ISINK = 3.2mA, VCC ≥ 5.0V 0.4

RESET Output Leakage Current

(MAX6805) VCC > VTH, RESET not asserted 0.5 µA

100

-50 -25 0 25 50 75 100 125

VCC FALLING PROPAGATION DELAY

vs. TEMPERATURE

MAX6803/04/05 toc06

TEMPERATURE (°C)

POROPAGATION DELAY (µs)

VCC = FALLING AT 1V/ms

VCC = FALLING AT 10V/ms

100 1000

100

200

400

300

500

600

0.1 1 10

MAXIMUM TRANSIENT DURATION

vs. RESET COMPARATOR OVERDRIVE

MAX6803/04/05 toc05

RESET COMPARATOR OVERDRIVE (mV)

MAXIMUM TRANSIENT DURATION (µs)

RESET OCCURS

RESET DOES

NOT OCCUR

100

1.0 2.01.5 2.5

OUTPUT-VOLTAGE HIGH

vs. SUPPLY VOLTAGE

MAX6803/04/05 toc04

VCC (V)

OUTPUT-VOLTAGE HIGH (VCC - VOH) (mV)

+25°C

-40°C

+125°C

+85°C

VTH = 2.93V

ISINK = 100µA

RESET ASSERTED

(MAX6803)

3.0

1.0 1.5 2.5 3.0

OUTPUT-VOLTAGE LOW

vs. SUPPLY VOLTAGE

MAX6803/04/05 toc03

VCC (V)

OUTPUT-VOLTAGE LOW (mV)

+25°C

-40°C

+125°C

+85°C

VTH = 2.93V

ISINK = 500µA

RESET

2.0

0.950

0.980

0.970

0.960

1.000

0.990

1.040

1.030

1.020

1.010

1.050

-50 -25 0 25 50 75 100 125

NORMALIZED RESET TIMEOUT PERIOD

vs. TEMPERATURE

MAX6803/04/05 toc02

TEMPERATURE (°C)

NORMALIZED RESET TIMEOUT PERIOD

3.0

4.0

3.5

5.0

4.5

6.0

5.5

6.5

-50 0 25-25 50 75 100 125

SUPPLY CURRENT

vs. TEMPERATURE

MAX6803/04/05 toc01

TEMPERATURE (°C)

ICC (µA)

VCC = +5.0V

VCC = +3.3V

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MAX6803/MAX6804/

MAX6805

4-Pin, Low-Power

µP Reset Circuits with Manual Reset

Typical Operating Characteristics

Electrical Characteristics (continued)

Applications Information

Manual-Reset Input

Many µP-based products require manual-reset capability,

allowing the operator, a test technician, or external logic

circuitry to initiate a reset. A logic low on MR asserts reset.

Reset remains asserted while MR is low, and for the reset

active timeout period after MR returns high. MR has an

internal 20kW pullup resistor, so it can be left unconnected

if not used. Connect a normally open momentary switch

from MR to GND to create a manual-reset function;

external debounce circuitry is not required.

Interfacing to µPs with

Bidirectional Reset Pins

Since the RESET output on the MAX6805 is open-drain,

this device interfaces easily with µPs that have bidirec-

tional reset pins, such as the Motorola 68HC11.

Connecting the µP supervisor’s RESET output directly

to the microcontroller’s (µC’s) RESET pin with a

single pullup resistor allows either device to assert reset

(Figure 1).

Negative-Going VCC Transients

In addition to issuing a reset to the µP during power-up,

power-down, and brownout conditions, these devices

are relatively immune to short-duration, negative-going

VCC transients (glitches). The Typical Operating

Characteristics show the Maximum Transient Duration

vs. Reset Comparator Overdrive graph. The graph

shows the maximum pulse width that a negative-going

VCC transient may typically have without issuing a reset

signal. As the amplitude of the transient increases, the

maximum allowable pulse width decreases.

Ensuring a Valid Reset Output Down to

VCC = 0

When VCC falls below 1V and approaches the minimum

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 to indeterminate voltages. This

does not present a problem in most cases, since most

Figure 1. Interfacing to μPs with Bidirectional Reset Pins

NAME FUNCTION

MAX6803

MAX6804

MAX6805

1 1 GND Ground

— 2 RESET

Active-Low Reset Output. RESET is asserted while VCC is below the reset

threshold, or while MR is asserted. RESET remains asserted for a reset

timeout period (tRP) after VCC rises above the reset threshold or MR is

deasserted. RESET on the MAX6804 is push/pull. RESET on the MAX6805

is open-drain.

2 — RESET

Active-High Reset Output. RESET is asserted high while VCC is below the

reset threshold or while MR is asserted, and RESET remains asserted for a

reset timeout period (tRP) after VCC rises above the reset threshold or MR

is deasserted. RESET on the MAX6803 is push/pull.

3 3

Manual-Reset Input. A logic low on MR asserts reset. Reset remains

asserted as long as MR is low, and for the reset timeout period (tRP) after

MR goes high. Leave unconnected or connect to VCC if not used.

4 4 VCC Supply Voltage Input

VCC

GND

MAX6805

RESETMR

VCC

GND

RESET

MOTOROLA

68HCXX

µP

100kΩ

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MAX6803/MAX6804/

MAX6805

4-Pin, Low-Power

µP Reset Circuits with Manual Reset

Pin Description

µPs and circuitry do not operate when VCC drops below

1V. For the MAX6804 application where RESET must

be valid down to 0, adding a pulldown resistor between

RESET and GND removes stray leakage currents,

holding RESET low (Figure 2a). The pulldown resistor

value is not critical; 100kW is large enough not to load

RESET, and small enough to pull it low. For the MAX6803,

where RESET must be valid to VCC = 0, a 100kW pullup

resistor between RESET and VCC will hold RESET high

when VCC falls below 0.7V (Figure 2b).

Since the MAX6805 has an open-drain, active-low

out-put, it typically uses a pullup resistor. With this device,

RESET will most likely not maintain an active condi-

tion, but will drift to a non-active level due to the pullup

resistor and the reduced sinking capability of the open-

drain device. Therefore, this device is not recommend-

ed for applications where the RESET pin is required to

be valid down to VCC = 0.

Figure 2. Ensuring Reset Valid down to VCC = 0

VCC

GND

MAX6804

RESETMR

100kΩ

(a)

VCC

GND

MAX6803

RESET

100kΩ*

(b)

*ASSUMES HIGH-Z RESET INPUT TO THE µP

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MAX6803/MAX6804/

MAX6805

4-Pin, Low-Power

µP Reset Circuits with Manual Reset

MAX6804

VCC

RESETMR RESET

GND

PUSHBUTTON

SWITCH

VCC

GND

µP

VCC

MR(RESET)

GND

MAX6803

MAX6804

MAX6805

SOT143

TOP VIEW

RESET

( ) ARE FOR MAX6803

Typical Operating Circuit

Pin Conguration

Table 1. Factory-Trimmed Reset Thresholds

RESET

THRESHOLD

SUFFIX

TA = +25°C TA = -40°C to +125°C

MIN TYP (VTH) MAX MIN MAX

48 4.714 4.80 4.886 4.656 4.944

47 4.615 4.70 4.785 4.559 4.841

46 4.547 4.63 4.713 4.491 4.769

45 4.419 4.50 4.581 4.365 4.635

44 4.301 4.38 4.459 4.249 4.511

43 4.223 4.30 4.377 4.171 4.429

42 4.124 4.20 4.276 4.074 4.326

41 4.026 4.10 4.174 3.977 4.223

40 3.928 4.00 4.072 3.880 4.120

39 4.830 3.90 3.970 3.783 4.017

38 3.732 3.80 3.868 3.686 3.914

37 3.633 3.70 3.767 3.589 3.811

36 3.535 3.60 3.665 3.492 3.708

35 3.437 3.50 3.563 3.395 3.605

34 3.339 3.40 3.461 3.298 3.502

33 3.241 3.30 3.359 3.201 3.399

32 3.142 3.20 3.258 3.104 3.296

31 3.025 3.08 3.135 2.988 3.172

30 2.946 3.00 3.054 2.910 3.090

29 2.877 2.93 2.983 2.842 3.018

28 2.750 2.80 2.850 2.716 2.884

27 2.651 2.70 2.749 2.619 2.781

26 2.583 2.63 2.677 2.551 2.709

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MAX6803/MAX6804/

MAX6805

4-Pin, Low-Power

µP Reset Circuits with Manual Reset

*Sample stock is generally held on all standard versions.

PART OUTPUT STAGE NOMINAL VTH (V) MIN RESET

TIMEOUT (ms)

SOT

TOP MARK

MAX6803US26D3-T Push/Pull RESET 2.63 100 KACH

MAX6803US29D3-T Push/Pull RESET 2.93 100 KACI

MAX6803US31D3-T Push/Pull RESET 3.08 100 KACJ

MAX6803US44D3-T Push/Pull RESET 4.38 100 KACK

MAX6803US46D3-T Push/Pull RESET 4.63 100 KACL

MAX6804US26D3-T Push/Pull RESET 2.63 100 KACN

MAX6804US29D3-T Push/Pull RESET 2.93 100 KACP

MAX6804US31D3-T Push/Pull RESET 3.08 100 KACQ

MAX6804US44D3-T Push/Pull RESET 4.38 100 KACR

MAX6804US46D3-T Push/Pull RESET 4.63 100 KACS

MAX6805US26D3-T Open-Drain RESET 2.63 100 KACO

MAX6805US29D3-T Open-Drain RESET 2.93 100 KACU

MAX6805US31D3-T Open-Drain RESET 3.08 100 KACV

MAX6805US44D3-T Open-Drain RESET 4.38 100 KACW

MAX6805US46D3-T Open-Drain RESET 4.63 100 KACX

PACKAGE

TYPE

PACKAGE

CODE

OUTLINE

NO.

LAND

PATTERN NO.

4 SOT143 U4-1 21-0052 90-0183

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MAX6803/MAX6804/

MAX6805

4-Pin, Low-Power

µP Reset Circuits with Manual Reset

Chip Information

TRANSISTOR COUNT: 505

PROCESS: BiCMOS

Selector Guide (Standard Versions*)

Package Information

For the latest package outline information and land patterns

(footprints), go to www.maximintegrated.com/packages. Note

that a “+”, “#”, or “-” in the package code indicates RoHS status

only. Package drawings may show a different suffix character, but

the drawing pertains to the package regardless of RoHS status.

REVISION

NUMBER

REVISION

DATE DESCRIPTION PAGES

CHANGED

3 7/14 No /V OPNs; removed Automotive reference from Applications section 1

Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses

are implied. Maxim Integrated reserves the right to change the circuitry and specications 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.

│

MAX6803/MAX6804/

MAX6805

4-Pin, Low-Power

µP Reset Circuits with Manual Reset

Revision History

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MAX6803US26D1+T MAX6803US26D2+T MAX6803US26D3+T MAX6803US27D1+T MAX6803US27D2+T

MAX6803US27D3+T MAX6803US28D1+T MAX6803US28D2+T MAX6803US28D3+T MAX6803US29D1+T

MAX6803US29D2+T MAX6803US29D3+T MAX6803US30D1+T MAX6803US30D2+T MAX6803US30D3+T

MAX6803US31D1+T MAX6803US31D2+T MAX6803US31D3+T MAX6803US32D1+T MAX6803US32D2+T

MAX6803US32D3+T MAX6803US33D1+T MAX6803US33D2+T MAX6803US33D3+T MAX6803US34D1+T

MAX6803US34D2+T MAX6803US34D3+T MAX6803US35D1+T MAX6803US35D2+T MAX6803US35D3+T

MAX6803US36D1+T MAX6803US36D2+T MAX6803US36D3+T MAX6803US37D1+T MAX6803US37D2+T

MAX6803US37D3+T MAX6803US38D1+T MAX6803US38D2+T MAX6803US38D3+T MAX6803US39D1+T

MAX6803US39D2+T MAX6803US39D3+T MAX6803US40D1+T MAX6803US40D2+T MAX6803US40D3+T

MAX6803US41D1+T MAX6803US41D2+T MAX6803US41D3+T MAX6803US42D1+T MAX6803US42D2+T

MAX6803US42D3+T MAX6803US43D1+T MAX6803US43D2+T MAX6803US43D3+T MAX6803US44D1+T

MAX6803US44D2+T MAX6803US44D3+T MAX6803US45D1+T MAX6803US45D2+T MAX6803US45D3+T

MAX6803US46D1+T MAX6803US46D2+T MAX6803US46D3+T MAX6803US47D1+T MAX6803US47D2+T

MAX6803US47D3+T MAX6803US48D1+T MAX6803US48D2+T MAX6803US48D3+T MAX6804US26D1+T

MAX6804US26D2+T MAX6804US26D3+T MAX6804US27D1+T MAX6804US27D2+T MAX6804US27D3+T

MAX6804US28D1+T MAX6804US28D2+T MAX6804US28D3+T MAX6804US29D1+T MAX6804US29D2+T

MAX6804US29D3+T MAX6804US30D1+T MAX6804US30D2+T MAX6804US30D3+T MAX6804US31D1+T

MAX6804US31D2+T MAX6804US31D3+T MAX6804US32D1+T MAX6804US32D2+T MAX6804US32D3+T

MAX6804US33D1+T MAX6804US33D2+T MAX6804US33D3+T MAX6804US34D1+T MAX6804US34D2+T

MAX6804US34D3+T MAX6804US35D1+T MAX6804US35D2+T MAX6804US35D3+T MAX6804US36D1+T