MAX803T

MAX803L_10 MAXIM | Alldatasheet

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Technical content

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 compo- nents 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 V CC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after V CC has risen above the reset thresh- old. Reset thresholds suitable for operation with a vari- ety 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 V CC. 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 V CC, 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

Critical µP and µC Power Monitoring Portable/Battery-Powered Equipment Automotive ♦♦ 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 TOP VIEW RESET (RESET) 1GND VCC MAX803 MAX809 MAX810 SC70-3/SOT23-3 ( ) ARE FOR MAX810. MAX803 AVAILABLE IN SC70-3 ONLY. MAX803 MAX809 VCC VCC RPULLUP* RESET RESET INPUT GND VCC GND *MAX803 ONLY μP Pin ConfigurationTypical Operating Circuit 19-0344; Rev 7; 2/10 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. Devices are available in both leaded and lead-free packaging. +Denotes a lead(Pb)-free/RoHS-compliant package.

Ordering Information

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. PART TEMP RANGE PIN-PACKAGE MAX803 _EXR-T -40°C to +125°C 3 SC70 MAX803_EXR+T -40°C to +125°C 3 SC70 MAX809 _EXR-T -40°C to +125°C 3 SC70 MAX809_EXR+T -40°C to +125°C 3 SC70 MAX809_EUR-T -40°C to +105°C 3 SOT23 MAX809_EUR+T -40°C to +105°C 3 SOT23 MAX810 _EXR-T -40°C to +125°C 3 SC70 MAX810_EXR+T -40°C to +125°C 3 SC70 MAX810_EUR-T -40°C to +105°C 3 SOT23 MAX810_EUR+T -40°C to +105°C 3 SOT23

MAX803L/M/R/S/T/Z, MAX809J/L/M/R/S/T/Z, MAX810L/M/R/S/T/Z 3-Pin Microprocessor Reset Circuits ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC = full range, TA = -40°C to +105°C (SOT23) or T A = -40°C to +125°C (SC70), unless otherwise noted. Typical values are at T A = +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) 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 specificatio ns is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Terminal Voltage (with respect to GND) Continuous Power Dissipation (TA = +70°C) Operating Temperature Range PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS TA = 0°C to +70°C 1.0 5.5 TA = -40°C to +105°C (MAX8_ _ _EUR) 1.2 5.5 VCC Range TA = -40°C to +125°C (MAX8_ _ _EXR) 1.2 5.5 V VCC < 5.5V, MAX8_ _L/M 24 60 TA = -40°C to +85°C VCC < 3.6V, MAX8_ _R/S/T/Z 17 50 VCC < 5.5V, MAX8_ _L/M 100 Supply Current (SOT23) I CC TA = +85°C to +105°C VCC < 3.6V, MAX8_ _R/S/T/Z 100 VCC < 5.5V, MAX8_ _L/M 24 35 TA = -40°C to +85°C VCC < 3.6V, MAX8_ _R/S/T/Z 17 30 VCC < 5.5V, MAX8_ _L/M 60 Supply Current (SC70) I CC TA = +85°C to +125°C VCC < 3.6V, MAX8_ _R/S/T/Z 60 μA TA = +25°C 4.56 4.63 4.70 TA = -40°C to +85°C 4.50 4.75 MAX8_ _L TA = -40°C to +125°C 4.40 4.86 TA = +25°C 4.31 4.38 4.45 TA = -40°C to +85°C 4.25 4.50 MAX8_ _M TA = -40°C to +125°C 4.16 4.56 TA = +25°C 3.93 4.00 4.06 TA = -40°C to +85°C 3.89 4.10 MAX809J (SOT only) TA = -40°C to +125°C 3.80 4.20 TA = +25°C 3.04 3.08 3.11 TA = -40°C to +85°C 3.00 3.15 MAX8_ _T TA = -40°C to +125°C 2.92 3.23 TA = +25°C 2.89 2.93 2.96 TA = -40°C to +85°C 2.85 3.00 MAX8_ _S TA = -40°C to +125°C 2.78 3.08 TA = +25°C 2.59 2.63 2.66 TA = -40°C to +85°C 2.55 2.70 Reset Threshold (SOT only) VTH MAX8_ _R TA = -40°C to +125°C 2.50 2.76 V

MAX803L/M/R/S/T/Z, MAX809J/L/M/R/S/T/Z, MAX810L/M/R/S/T/Z 3-Pin Microprocessor Reset Circuits ELECTRICAL CHARACTERISTICS (continued) (VCC = full range, TA = -40°C to +105°C (SOT23) or T A = -40°C to +125°C (SC70), unless otherwise noted. Typical values are at T A = +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 TA = +25°C 4.56 4.63 4.70 TA = -40°C to +85°C 4.50 4.75 MAX8_ _L TA = -40°C to +125°C 4.44 4.82 TA = +25°C 4.31 4.38 4.45 TA = -40°C to +85°C 4.25 4.50 MAX8_ _M TA = -40°C to +125°C 4.20 4.56 TA = +25°C 3.04 3.08 3.11 TA = -40°C to +85°C 3.00 3.15 MAX8_ _T TA = -40°C to +125°C 2.95 3.21 TA = +25°C 2.89 2.93 2.96 TA = -40°C to +85°C 2.85 3.00 MAX8_ _S TA = -40°C to +125°C 2.81 3.05 TA = +25°C 2.59 2.63 2.66 TA = -40°C to +85°C 2.55 2.70 MAX8_ _R TA = -40°C to +125°C 2.52 2.74 TA = +25°C 2.28 2.32 2.35 TA = -40°C to +85°C 2.25 2.38 Reset Threshold (SC70 only) VTH MAX8_ _Z (SC70 only) TA = -40°C to +125°C 2.22 2.42 V Reset Threshold Tempco 30 ppm/°C VCC to Reset Delay (Note 2) V CC = VTH to (VTH - 100mV) 20 μs TA = -40°C to +85°C 140 240 560 Reset Active Timeout Period (SOT23) TA = +85°C to +105°C 100 840 ms TA = -40°C to +85°C 140 240 460 Reset Active Timeout Period (SC70) TA = +85°C to +125°C 100 840 ms 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 RESET Output Voltage Low (push-pull active low and open- drain active low, MAX803 and MAX809) VOL VCC > 1.0V, ISINK = 50μA 0.3 V VCC > VTH max, ISOURCE = 500μA, MAX803R/S/T/Z, MAX809R/S/T/Z 0.8VCC RESET Output Voltage High (push-pull active low MAX809) VOH VCC > VTH max, ISOURCE = 800μA, MAX803L/M, MAX809J/L/M VCC - 1.5 V VCC = VTH max, ISINK = 1.2mA, MAX810R/S/T/Z 0.3 RESET Output Voltage Low (push-pull active high, MAX810) VOL VCC = VTH max, ISINK = 3.2mA, MAX810L/M 0.4 V

MAX803L/M/R/S/T/Z, MAX809J/L/M/R/S/T/Z, MAX810L/M/R/S/T/Z 3-Pin Microprocessor Reset Circuits 225 POWER-UP RESET TIMEOUT vs. TEMPERATURE 245 250 MAX803-TOC5 TEMPERATURE (°C) POWER-UP RESET TIMEOUT (ms) 235 230 240 -40 8520-20 0 6040 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 8520-20 0 6040 POWER-DOWN RESET DELAY vs. TEMPERATURE (MAX8_ _J/L/M) 100 120 140 MAX803-TOC4 TEMPERATURE (°C) POWER-DOWN RESET DELAY (μs) -40 8520-20 0 6040 VOD = VTH - VCC VOD = 10mV VOD = 100mV VOD = 200mV VOD = 20mV POWER-DOWN RESET DELAY vs. TEMPERATURE (MAX8_ _R/S/T/Z) 100 MAX803-TOC3 TEMPERATURE (°C) POWER-DOWN RESET DELAY (μs) -40 8520-20 0 6040 VOD = VTH - VCC VOD = 20mV VOD = 10mV VOD = 200mV VOD = 100mV Typical Operating Characteristics (VCC = full range, T A = -40°C to +105°C, unless otherwise noted. Typical values are at T A = +25°C, V CC = +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.) -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 ELECTRICAL CHARACTERISTICS (continued) (VCC = full range, TA = -40°C to +105°C (SOT23) or T A = -40°C to +125°C (SC70), unless otherwise noted. Typical values are at T A = +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 Output Voltage High (push-pull active high, MAX810) VOH 1.8V < V CC < VTH min, ISOURCE = 150μA 0.8V CC V RESET Open-Drain Output Leakage Current (MAX803) (Note 3) V CC > VTH, RESET deasserted 1 μA 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.

MAX803L/M/R/S/T/Z, MAX809J/L/M/R/S/T/Z, MAX810L/M/R/S/T/Z 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 V CC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after V CC has risen above the reset thresh- old. 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 out- put 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 V CC transients (glitches). Figure 1 shows typical transient duration vs. reset com- parator overdrive, for which the MAX803/MAX809/ MAX810 do not generate a reset pulse. The graph was generated using a negative-going pulse applied to V CC, starting 0.5V above the actual reset threshold and end- ing below it by the magnitude indicated (reset compara- tor overdrive). The graph indicates the maximum pulse width a negative-going V CC transient can have without 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 V CC 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 V CC pin provides additional transient immunity. Ensuring a Valid Reset Output Down to VCC = 0V When V CC falls below 1V, the MAX809 RESET output no longer sinks current—it becomes an open circuit. 3-Pin Microprocessor Reset Circuits 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.

1 GND Ground

(MAX810) RESET Output remains high while VCC is below the reset threshold, and for at least 140ms after V CC rises above the reset threshold.

3 VCC

Supply Voltage (+5V, +3.3V, +3.0V, or +2.5V) Selector Guide TOP MARKPART/SUFFIX RESET THRESHOLD (V) OUTPUT TYPE SOT SC70 MAX803L 4.63 OPEN-DRAIN RESET ⎯ AAZ MAX803M 4.38 OPEN-DRAIN RESET ⎯ ABA MAX803T 3.08 OPEN-DRAIN RESET ⎯ ABB MAX803S 2.93 OPEN-DRAIN RESET ⎯ ABC MAX803R 2.63 OPEN-DRAIN RESET ⎯ ABD MAX803Z 2.32 OPEN-DRAIN RESET ⎯ ABE MAX809L 4.63 PUSH-PULL RESET AAAA AAN MAX809M 4.38 PUSH-PULL RESET ABAA AAO MAX809J 4.00 PUSH-PULL RESET CWAA ⎯ MAX809T 3.08 PUSH-PULL RESET ACAA AAP MAX809S 2.93 PUSH-PULL RESET ADAA AAQ MAX809R 2.63 PUSH-PULL RESET AFAA AAR MAX809Z 2.32 PUSH-PULL RESET ⎯ AAS MAX810L 4.63 PUSH-PULL RESET AGAA AAT MAX810M 4.38 PUSH-PULL RESET AHAA AAU MAX810T 3.08 PUSH-PULL RESET AJAA AAV MAX810S 2.93 PUSH-PULL RESET AKAA AAX MAX810R 2.63 PUSH-PULL RESET ALAA AAW MAX810Z 2.32 PUSH-PULL RESET ⎯ AAY Pin Description

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. Benefits of Highly Accurate Reset Threshold Most µP supervisor ICs have reset threshold voltages between 5% and 10% below the value of nominal sup- ply voltages. This ensures a reset will not occur within 5% of the nominal supply, but will occur when the sup- ply 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. Chip Information TRANSISTOR COUNT: 275 (SOT23) 380 (SC70)

Package Information

For the latest package outline information and land patterns, go to www.maxim-ic.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. MAX803L/M/R/S/T/Z, MAX809J/L/M/R/S/T/Z, MAX810L/M/R/S/T/Z 3-Pin Microprocessor Reset Circuits PACKAGE TYPE PACKAGE CODE DOCUMENT NO.

3 SC70 X3-2 21-0075

3 SOT23 U3-1 21-0051

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 cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circu it patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

Revision History

0 12/94 Initial release. — 7 2/10 Updated Ordering information, added lead-free note, and added soldering temperature in the Absolute Maximum Ratings . 1, 2