MAX803TEXR+T - Maxim Integrated

General Description

The MAX803/MAX809/MAX810 are microprocessor (μP)

supervisory circuits used to monitor the power supplies

in μP and digital systems. They provide excellent circuit

reliability and low cost by eliminating external components

and adjustments when used with +5V, +3.3V, +3.0V, or

+2.5V powered circuits.

These circuits perform a single function: they assert a

reset signal whenever the VCC supply voltage declines

below a preset threshold, keeping it asserted for at least

140ms after VCC has risen above the reset threshold.

Reset thresholds suitable for operation with a variety of

supply voltages are available.

The MAX803 has an open-drain output stage, while the

MAX809/MAX810 have push-pull outputs. The MAX803’s

open-drain RESET output requires a pullup resistor that

can be connected to a voltage higher than VCC. The

MAX803/MAX809 have an active-low RESET output,

while the MAX810 has an active-high RESET output. The

reset comparator is designed to ignore fast transients on

VCC, and the outputs are guaranteed to be in the correct

logic state for VCC down to 1V.

Low supply current makes the MAX803/MAX809/MAX810

ideal for use in portable equipment. The MAX803 is

available in a 3-pin SC70 package, and the MAX809/

MAX810 are available in 3-pin SC70 or SOT23 packages.

Applications

●Computers

●Controllers

● Intelligent Instruments

● Critical μP and μC Power Monitoring

● Portable/Battery-Powered Equipment

●Automotive

Benets and Features

● Precision Monitoring of +2.5V, +3V, +3.3V, and

+5V Power-Supply Voltages

● Fully Specified Over Temperature

● Available in Three Output Configurations

• Open-Drain RESET Output (MAX803)

• Push-Pull RESET Output (MAX809)

• Push-Pull RESET Output (MAX810)

● 140ms (min) Power-On-Reset Pulse Width

● 12μA Supply Current

●Guaranteed Reset Valid to VCC = +1V

● Power Supply Transient Immunity

● No External Components

● 3-Pin SC70 and SOT23 Packages

19-0344; Rev 10; 12/15

MAX803

MAX809

VCC

RPULLUP*

RESET RESET

INPUT

GND

VCC

GND

*MAX803 ONLY

µP

Selector Guide and Ordering Information appear at end of data

sheet.

MAX803/MAX809/

MAX810

3-Pin Microprocessor Reset Circuits

Typical Operating Circuit

Terminal Voltage (with respect to GND)

VCC ...................................................................-0.3V to +6.0V

RESET, RESET (push-pull) .................. -0.3V to (VCC + 0.3V)

RESET (open drain) .........................................-0.3V to +6.0V

Input Current, VCC .............................................................20mA

Output Current, RESET, RESET ........................................20mA

Rate of Rise, VCC ..........................................................100V/μs

Continuous Power Dissipation (TA = +70°C)

3-Pin SC70 (derate 2.17mW/°C above +70°C) ...........174mW

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

Operating Temperature Range

3-Pin SC70 ................................................... -40°C to +125°C

3-Pin SOT23 ................................................. -40°C to +105°C

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

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

Soldering Temperature (reflow) .......................................+260°C

(VCC = full range, TA = -40°C to +105°C (SOT23) or TA = -40°C to +125°C (SC70), unless otherwise noted. Typical values are at TA =

+25°C, VCC = 5V for L/M/J versions, VCC = 3.3V for T/S versions, VCC = 3V for R version, and VCC = 2.5V for Z version.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

VCC Range

TA = 0°C to +70°C 1.0 5.5

VTA = -40°C to +105°C (MAX8_ _ _EUR) 1.2 5.5

TA = -40°C to +125°C (MAX8_ _ _EXR) 1.2 5.5

Supply Current (SOT23) ICC

TA = -40°C

to +85°C

VCC < 5.5V, MAX8_ _L/M 24 60

µA

VCC < 3.6V, MAX8_ _R/S/T/Z 17 50

TA = +85°C

to +105°C

VCC < 5.5V, MAX8_ _L/M 100

VCC < 3.6V, MAX8_ _R/S/T/Z 100

Supply Current (SC70) ICC

TA = -40°C

to +85°C

VCC < 5.5V, MAX8_ _L/M 24 35

VCC < 3.6V, MAX8_ _R/S/T/Z 17 30

TA = +85°C

to +125°C

VCC < 5.5V, MAX8_ _L/M 60

VCC < 3.6V, MAX8_ _R/S/T/Z 60

Reset Threshold

(SOT only) VTH

MAX8_ _L

TA = +25°C 4.56 4.63 4.70

TA = -40°C to +85°C 4.50 4.75

TA = -40°C to +125°C 4.40 4.86

MAX8_ _M

TA = +25°C 4.31 4.38 4.45

TA = -40°C to +85°C 4.25 4.50

TA = -40°C to +125°C 4.16 4.56

MAX809J

(SOT only)

TA = +25°C 3.93 4.00 4.06

TA = -40°C to +85°C 3.89 4.10

TA = -40°C to +125°C 3.80 4.20

MAX8_ _T

TA = +25°C 3.04 3.08 3.11

TA = -40°C to +85°C 3.00 3.15

TA = -40°C to +125°C 2.92 3.23

MAX8_ _S

TA = +25°C 2.89 2.93 2.96

TA = -40°C to +85°C 2.85 3.00

TA = -40°C to +125°C 2.78 3.08

MAX8_ _R

TA = +25°C 2.59 2.63 2.66

TA = -40°C to +85°C 2.55 2.70

TA = -40°C to +125°C 2.50 2.76

MAX803/MAX809/

MAX810

3-Pin Microprocessor Reset Circuits

www.maximintegrated.com Maxim Integrated

│

Absolute Maximum Ratings

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 +105°C (SOT23) or TA = -40°C to +125°C (SC70), unless otherwise noted. Typical values are at TA =

+25°C, VCC = 5V for L/M/J versions, VCC = 3.3V for T/S versions, VCC = 3V for R version, and VCC = 2.5V for Z version.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Reset Threshold

(SC70 only) VTH

MAX8_ _L

TA = +25°C 4.56 4.63 4.70

TA = -40°C to +85°C 4.50 4.75

TA = -40°C to +125°C 4.44 4.82

MAX8_ _M

TA = +25°C 4.31 4.38 4.45

TA = -40°C to +85°C 4.25 4.50

TA = -40°C to +125°C 4.20 4.56

MAX8_ _T

TA = +25°C 3.04 3.08 3.11

TA = -40°C to +85°C 3.00 3.15

TA = -40°C to +125°C 2.95 3.21

MAX8_ _S

TA = +25°C 2.89 2.93 2.96

TA = -40°C to +85°C 2.85 3.00

TA = -40°C to +125°C 2.81 3.05

MAX8_ _R

TA = +25°C 2.59 2.63 2.66

TA = -40°C to +85°C 2.55 2.70

TA = -40°C to +125°C 2.52 2.74

MAX8_ _Z

(SC70 only)

TA = +25°C 2.28 2.32 2.35

TA = -40°C to +85°C 2.25 2.38

TA = -40°C to +125°C 2.22 2.42

Reset Threshold Tempco 30 ppm/°C

VCC to Reset Delay (Note 2) VCC = VTH to (VTH - 100mV) 20 µs

Reset Active Timeout Period

(SOT23)

TA = -40°C to +85°C 140 240 560 ms

TA = +85°C to +105°C 100 840

Reset Active Timeout Period

(SC70)

TA = -40°C to +85°C 140 240 460 ms

TA = +85°C to +125°C 100 840

RESET Output Voltage Low

(push-pull active low and open-

drain active low, MAX803 and

MAX809)

VOL

VCC = VTH (min), ISINK = 1.2mA,

MAX803R/S/T/Z, MAX809R/S/T/Z 0.3

VCC = VTH (min), ISINK = 3.2mA,

MAX803L/M, MAX809J/L/M 0.4

VCC > 1.0V, ISINK = 50µA 0.3

RESET Output Voltage High

(push-pull active low MAX809) VOH

VCC > VTH (max), ISOURCE = 500µA,

MAX803R/S/T/Z, MAX809R/S/T/Z 0.8VCC

VCC > VTH (max), ISOURCE = 800µA,

MAX803L/M, MAX809J/L/M VCC - 1.5

RESET Output Voltage Low

(push-pull active high, MAX810) VOL

VCC = VTH (max), ISINK = 1.2mA,

MAX810R/S/T/Z 0.3

VCC = VTH (max), ISINK = 3.2mA,

MAX810L/M 0.4

MAX803/MAX809/

MAX810

3-Pin Microprocessor Reset Circuits

www.maximintegrated.com Maxim Integrated

│

Electrical Characteristics (continued)

(VCC = full range, TA = -40°C to +105°C (SOT23) or TA = -40°C to +125°C (SC70), unless otherwise noted. Typical values are at TA =

+25°C, VCC = 5V for L/M/J versions, VCC = 3.3V for T/S versions, VCC = 3V for R version, and VCC = 2.5V for Z version.) (Note 1)

Note 1: Production testing done at TA = +25°C; limits over temperature guaranteed by design only.

Note 2: RESET output for MAX803/MAX809; RESET output for MAX810.

Note 3: Guaranteed by design, not production tested.

(VCC = full range, TA = -40°C to +105°C, unless otherwise noted. Typical values are at TA = +25°C, VCC = +5V for L/M/J versions,

VCC = +3.3V for T/S versions, VCC = +3V for R version, and VCC = +2.5V for Z version.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

RESET Output Voltage High

(push-pull active high, MAX810) VOH 1.8V < VCC < VTH (min), ISOURCE = 150µA 0.8VCC V

RESET Open-Drain Output

Leakage Current (MAX803)

(Note 3)

VCC > VTH, RESET deasserted 1 µA

POWER-DOWN RESET DELAY vs.

TEMPERATURE (MAX8_ _R/S/T/Z)

100

MAX803-TOC3

TEMPERATURE (°C)

POWER-DOWN RESET DELAY (µs)

-40 85

-20 060

VOD = VTH - VCC

VOD = 20mV

VOD = 10mV

VOD = 200mV

VOD = 100mV

POWER-DOWN RESET DELAY vs.

TEMPERATURE (MAX8_ _J/L/M)

100

120

140

MAX803-TOC4

TEMPERATURE (°C)

POWER-DOWN RESET DELAY (µs)

-40 85

-20 060

VOD = VTH - VCC

VOD = 10mV

VOD = 100mV

VOD = 200mV

VOD = 20mV

225

POWER-UP RESET TIMEOUT

vs. TEMPERATURE

245

250

MAX803-TOC5

TEMPERATURE (°C)

POWER-UP RESET TIMEOUT (µs)

235

230

240

-40 85

-20 060

MAX8_ _R/S/T/Z

MAX8_ _J/L/M

0.997

NORMALIZED RESET THRESHOLD

vs. TEMPERATURE

1.001

1.002

1.003

MAX803-TOC6

TEMPERATURE (°C)

NORMALIZED THRESHOLD

0.999

0.998

1.000

-40 85

-20 060

-40 20 40-20 0 60 85

SUPPLY CURRENT vs. TEMPERATURE

(SC70 PACKAGE, NO LOAD)

MAX803 toc01

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

MAX8_ _R/S/T, VCC = 3.3V

MAX8_ _L/M/R/S/T/Z, VCC = 1V

MAX8_ _Z, VCC = 2.5V

MAX8_ _L/M, VCC = 5V

MAX803/MAX809/

MAX810

3-Pin Microprocessor Reset Circuits

www.maximintegrated.com Maxim Integrated

│

Electrical Characteristics (continued)

Typical Operating Characteristics

Detailed Description

A microprocessor’s (μP’s) reset input starts the μP in a

known state. The MAX803/MAX809/MAX810 assert reset

to prevent code-execution errors during power-up, power-

down, or brownout conditions. They assert a reset signal

whenever the VCC supply voltage declines below a preset

threshold, keeping it asserted for at least 140ms after VCC

has risen above the reset threshold. The MAX803 uses

an open-drain output, and the MAX809/MAX810 have a

push-pull output stage. Connect a pullup resistor on the

MAX803’s RESET output to any supply between 0 and 6V.

Applications Information

Negative-Going VCC Transients

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

power-down, and brownout conditions, the MAX803/

MAX809/MAX810 are relatively immune to short-duration

negative-going VCC transients (glitches).

Figure 1 shows typical transient duration vs. reset

comparator overdrive, for which the MAX803/MAX809/

MAX810 do not generate a reset pulse. The graph

was generated using a negative-going pulse applied

to VCC, starting 0.5V above the actual reset threshold

and ending below it by the magnitude indicated (reset

comparator overdrive). The graph indicates the maximum

pulse width a negative-going VCC transient can have with-

out causing a reset pulse. As the magnitude of the transient

increases (goes farther below the reset threshold), the

maximum allowable pulse width decreases. Typically, for

the MAX8__L and MAX8__M, a VCC transient that goes

100mV below the reset threshold and lasts 20μs or less will

not cause a reset pulse. A 0.1μF bypass capacitor mounted

as close as possible to the VCC pin provides additional

transient immunity.

Ensuring a Valid Reset Output Down to

VCC = 0V

When VCC falls below 1V, the MAX809 RESET output no

longer sinks current—it becomes an open circuit.

Therefore, high-impedance CMOS logic inputs connect-

ed to RESET can drift to undetermined voltages. This

presents no problem in most applications since most

μP and other circuitry is inoperative with VCC below 1V.

However, in applications where RESET must be valid

down to 0V, adding a pull-down resistor to RESET causes

any stray leakage currents to flow to ground, holding

RESET low (Figure 2). R1’s value is not critical; 100kΩ is

large enough not to load RESET and small enough to pull

RESET to ground.

A 100kΩ pullup resistor to VCC is also recommended for the

MAX810 if RESET is required to remain valid for VCC < 1V.

Interfacing to μPs with Bidirectional Reset

Pins

Since the RESET output on the MAX803 is open

drain, this device interfaces easily with μPs that have

bidirectional reset pins, such as the Motorola 68HC11.

Connecting the μP supervisor’s RESET output directly to

the μC’s RESET pin with a single pullup resistor allows

either device to assert reset (Figure 3).

MAX803 Open-Drain RESET Output Allows

Use with Multiple Supplies

Generally, the pullup connected to the MAX803 will

connect to the supply voltage that is being monitored at the

IC’s VCC pin. However, some systems may use the open-

drain output to level-shift from the monitored supply to reset

circuitry powered by some other supply (Figure 4). Note

that as the MAX803’s VCC decreases below 1V, so does

the IC’s ability to sink current at RESET. Also, with any

pullup, RESET will be pulled high as VCC decays toward

0. The voltage where this occurs depends on the pullup

resistor value and the voltage to which it is connected.

PIN NAME FUNCTION

1GND Ground

RESET

(MAX803/

MAX809)

RESET Output remains low while VCC

is below the reset threshold, and for at

least 140ms after VCC rises above the

reset threshold.

RESET

(MAX810)

RESET Output remains high while VCC

is below the reset threshold, and for at

least 140ms after VCC rises above the

reset threshold.

3 VCC Supply Voltage (+5V, +3.3V, +3.0V, or

+2.5V)

TOP VIEW

RESET (RESET)

GND

VCC

MAX803

MAX809

MAX810

SC70-3/SOT23-3

( ) ARE FOR MAX810.

MAX803 AVAILABLE IN SC70-3 ONLY.

MAX803/MAX809/

MAX810

3-Pin Microprocessor Reset Circuits

www.maximintegrated.com Maxim Integrated

│

Pin Description

Pin Conguration

Benets of Highly Accurate Reset Threshold

Most μP supervisor ICs have reset-threshold voltages

between 5% and 10% below the value of nominal supply

voltages. This ensures a reset will not occur within 5% of

the nominal supply, but will occur when the supply is 10%

below nominal.

When using ICs rated at only the nominal supply ±5%,

this leaves a zone of uncertainty where the supply is

between 5% and 10% low, and where the reset may or

may not be asserted.

The MAX8_ _L/T/Z use highly accurate circuitry to ensure

that reset is asserted close to the 5% limit, and long

before the supply has declined to 10% below nominal.

400

320

1 100 1000

160

240

RESET COMPARATOR OVERDRIVE, VTH - VCC (mV)

MAXIMUM TRANSIENT DURATION (µs)

TA = +25°C

MAX8_ _J/L/M

MAX8_ _R/S/T/Z

RESET

GND

RESET

INPUT

MAX803 MOTOROLA

68HCXX

µP

GND

VCC

100kΩ

VCC

GND

MAX809

RESET

GND

RESET

INPUT

RPULLUP

MAX803 5V SYSTEM

GND

VCC

+3.3V +5.0V

VCC

Figure 1. Maximum Transient Duration Without Causing a

Reset Pulse vs. Reset Comparator Overdrive

Figure 3. Interfacing to μPs with Bidirectional Reset I/O

Figure 2. RESET Valid to VCC = Ground Circuit

Figure 4. MAX803 Open-Drain RESET Output Allows Use with

Multiple Supplies

MAX803/MAX809/

MAX810

3-Pin Microprocessor Reset Circuits

www.maximintegrated.com Maxim Integrated

│

Note: These parts are offered in 2.5k reels, and must be

ordered in 2.5k increments. Insert the desired suffix letter from

the Selector Guide into the blank to complete the part number.

All versions of these products may not be available at the time

of announcement. Contact factory for availability.

Some devices are available in both leaded and lead-free packaging.

+Denotes a lead(Pb)-free/RoHS-compliant package.

/V denotes an automotive qualified part.

T = Tape and reel.

PACKAGE TYPE PACKAGE CODE DOCUMENT NO.

3 SC70 X3+2, X3-2 21-0075

3 SOT23 U3+1, U3-1 21-0051

PART TEMP RANGE PIN-PACKAGE

MAX803_EXR-T -40ºC to +125ºC 3 SC70

MAX803_EXR+T -40ºC to +125ºC 3 SC70

MAX803_EXR/V+ -40ºC to +125ºC 3 SC70

MAX803_EXR/V+T -40ºC to +125ºC 3 SC70

MAX809_EXR-T -40ºC to +125ºC 3 SC70

MAX809_EXR+T -40ºC to +125ºC 3 SC70

MAX809_EUR-T -40ºC to +105ºC 3 SOT23

MAX809_EUR+T -40ºC to +105ºC 3 SOT23

MAX810_EXR+T -40ºC to +125ºC 3 SC70

MAX810_EUR+T -40ºC to +105ºC 3 SOT23

MAX803/MAX809/

MAX810

3-Pin Microprocessor Reset Circuits

www.maximintegrated.com Maxim Integrated

│

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.

Chip Information

TRANSISTOR COUNT: 275 (SOT23)

380 (SC70)

Ordering Information

Selector Guide

PART/SUFFIX RESET THRESHOLD (V) OUTPUT TYPE

MAX803L 4.63 Open-Drain RESET

MAX803M 4.38 Open-Drain RESET

MAX803T 3.08 Open-Drain RESET

MAX803S 2.93 Open-Drain RESET

MAX803R 2.63 Open-Drain RESET

MAX803Z 2.32 Open-Drain RESET

MAX809L 4.63 Push-Pull RESET

MAX809M 4.38 Push-Pull RESET

MAX809J 4.00 Push-Pull RESET

MAX809T 3.08 Push-Pull RESET

MAX809S 2.93 Push-Pull RESET

MAX809R 2.63 Push-Pull RESET

MAX809Z 2.32 Push-Pull RESET

MAX810L 4.63 Push-Pull RESET

MAX810M 4.38 Push-Pull RESET

MAX810T 3.08 Push-Pull RESET

MAX810S 2.93 Push-Pull RESET

MAX810R 2.63 Push-Pull RESET

MAX810Z 2.32 Push-Pull RESET

For top mark information, go to https://www.maximintegrated.com/en/design/packaging/topmark/.

REVISION

NUMBER

REVISION

DATE DESCRIPTION PAGES

CHANGED

0 12/94 Initial release. —

72/10 Updated Ordering Information, added lead-free note, and added soldering temperature

in the Absolute Maximum Ratings 1, 2

8 12/12 Added MAX803_EXR/V+ to Ordering Information 1

96/15 Added MAX803_EXR/V+ to Ordering Information, moved Ordering Information, Pin

Conguration, and Selector Guide to end of data sheet, and rebranded data sheet 1–8

10 12/15 Added lead-free package code information and removed top mark information from

Selector Guide 7

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.

Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.

MAX803/MAX809/

MAX810

3-Pin Microprocessor Reset Circuits

│

Revision History

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