MAXIM MAX803L, MAX803M, MAX803R, MAX803S, MAX803T Technical data

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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 VCCsupply voltage declines below a preset threshold, keeping it asserted for at least 140ms after VCChas 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 pull-up 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 VCCdown 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

____________________________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

MAX803L/M/R/S/T/Z, MAX809J/L/M/R/S/T/Z, MAX810L/M/R/S/T/Z

3-Pin Microprocessor Reset Circuits

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

Typical Operating Circuit

19-0344; Rev 4; 12/99

Note: These parts are offered in 2.5k or 10k reels, and must be ordered in 2.5k or 10k increments. Order MAX803_EXR-T for

2.5k reels and MAX803_EXR-T10 for 10k reels. 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.

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.

3 SC70-3-40°C to +105°CMAX803_EXR-T10

3 SC70-3

PIN-PACKAGETEMP. RANGE

-40°C to +105°C

MAX803_EXR-T

PART

3 SC70-3-40°C to +105°CMAX809_EXR-T10

3 SC70-3-40°C to +105°C

MAX809_EXR-T

3 SOT23-3-40°C to +105°CMAX809_EUR-T10

3 SOT23-3-40°C to +105°CMAX809_EUR-T

3 SC70-3-40°C to +105°CMAX810_EXR-T10

3 SC70-3-40°C to +105°C

MAX810_EXR-T

3 SOT23-3-40°C to +105°CMAX810_EUR-T10

3 SOT23-3-40°C to +105°CMAX810_EUR-T

Ordering Information

查询MAX803LEXR-T供应商查询MAX803LEXR-T供应商

RESET INPUT

µP

MAX803 MAX809

RESET

PULL-UP

TOP VIEW

GND

MAX803 MAX809 MAX810

SC70-3/SOT23-3

*MAX803 ONLY

GND

( ) ARE FOR MAX810. MAX803 AVAILABLE IN SC70-3 ONLY.

RESET (RESET)

MAX803L/M/R/S/T/Z, MAX809J/L/M/R/S/T/Z, MAX810L/M/R/S/T/Z

3-Pin Microprocessor Reset Circuits

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(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, V

= 3.3V for T/S versions, VCC= 3V for R version, and VCC= 2.5V for Z version.) (Note 1)

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.

Terminal Voltage (with respect to GND)

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

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

+ 0.3V)

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

Input Current, V

..............................................................20mA

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

Rate of Rise, V

............................................................100V/µs

Continuous Power Dissipation (T

= +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 .........................-40°C to +105°C

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

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

TA= -40°C to +85°C

TA= -40°C to +105°C

TA= 0°C to +70°C

TA= +85°C to +105°C

MAX8_ _Z (SC70 only)

TA= -40°C to +85°C

VCC< 3.6V, MAX8_ _R/S/T

TA= +85°C to +105°C

MAX8_ _L

CONDITIONS

2.21 2.45

2.25 2.38

2.28 2.32 2.35

2.50 2.76

4.50 4.75

4.56 4.63 4.70

Reset Threshold

24 60

Supply Current (SOT23)

1.2 5.5

1.0 5.5

VCCRange

µA

12 30

16 35

Supply Current (SC70)

VCC< 5.5V, MAX8_ _L/M

VCC< 3.6V, MAX8_ _R/S/T

VCC< 5.5V, MAX8_ _L/M

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

17 50

100

UNITSMIN TYP MAXSYMBOLPARAMETER

VCC< 5.5V, MAX8_ _J/L/M

VCC< 5.5V, MAX8_ _L/M

MAX8_ _S

2.89 2.93 2.96TA= +25°C

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

TA= +25°C

TA= -40°C to +85°C

MAX8_ _M

4.25 4.50

2.85 3.00TA= -40°C to +85°C

MAX8_ _R

2.55 2.70

2.59 2.63 2.66

2.78 3.08TA= +85°C to +105°C

TA= +25°C

TA= -40°C to +85°C

4.31 4.38 4.45

4.40 4.86TA= +85°C to +105°C

TA= +25°C

TA= -40°C to +85°C

MAX809J (SOT only)

3.93 4.00 4.06

4.16 4.56TA= +85°C to +105°C

TA= +25°C

3.89 4.10TA= -40°C to +85°C

3.80 4.20TA= +85°C to +105°C

MAX8_ _T

2.92 3.23

3.00 3.15

3.04 3.08 3.11TA= +25°C

TA= -40°C to +85°C

TA= +85°C to +105°C

TA= +25°C

TA= -40°C to +85°C

TA= +85°C to +105°C

MAX803L/M/R/S/T/Z, MAX809J/L/M/R/S/T/Z, MAX810L/M/R/S/T/Z

3-Pin Microprocessor Reset Circuits

_______________________________________________________________________________________ 3

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.

TA= -40°C to +85°C

TA= +85°C to +105°C

TA= -40°C to +85°C

VCC= VTHto (VTH- 100mV)

CONDITIONS

140 240 460

Reset Active Timeout Period (SC70)

100 840

140 240 560

Reset Active Timeout Period (SOT23)

µs20VCCto Reset Delay (Note 2)

ppm/°C30Reset Threshold Tempco

UNITSMIN TYP MAXSYMBOLPARAMETER

TA= +85°C to +105°C

VCC= VTHmax, I

SINK

= 3.2mA,

MAX810L/M

VCC= VTHmax, I

SINK

= 1.2mA,

MAX810R/S/T/Z

VCC> VTHmax, I

SOURCE

= 800µA,

MAX809J/L/M

> VTHmax, I

SOURCE

= 500µA,

MAX809R/S/T/Z

VCC= VTHmin, I

SINK

= 1.2mA,

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

VCC= VTHmin, I

SINK

= 3.2mA,

MAX803L/M, MAX809J/L/M

VCC> VTH, RESET deasserted

VCC> 1.0V, I

SINK

= 50µA

1.8V < VCC< VTHmin, I

SOURCE

= 150µA

µA1

RESET Open-Drain Output Leakage Current (MAX803)

V0.8V

RESET Output Voltage High (push-pull active high, MAX810)

100 840

0.4

0.3

RESET Output Voltage Low (push-pull active high, MAX810)

VCC- 1.5

0.8V

RESET Output Voltage High (push-pull active low, MAX809)

0.3

RESET Output Voltage Low (push-pull active low and opendrain active-low, MAX803 and MAX809)

0.4

0.3

POWER-DOWN RESET DELAY vs.

TEMPERATURE (MAX8_ _R/S/T/Z)

100

MAX803-TOC3

TEMPERATURE (°C)

POWER-DOWN RESET DELAY (µs)

-40

-20

VOD = VTH - V

VOD = 20mV

VOD = 10mV

VOD = 200mV

VOD = 100mV

Typical Operating Characteristics

(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, V

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

ELECTRICAL CHARACTERISTICS (continued)

(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, V

= 3.3V for T/S versions, VCC= 3V for R version, and VCC= 2.5V for Z version.) (Note 1)

-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

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