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Analog Devices Inc./Maxim Integrated MAX809REXR+T10
- Part No.:
- MAX809REXR+T10
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX809REXR+T10.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,303
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Product details
Overview
MAX809REXR+T10 from Maxim Integrated is a precision 3-pin microprocessor supervisory circuit with push-pull active-low RESET output, designed to monitor +2.5V supply rails in embedded systems. It asserts reset when VCC falls below 2.63V (±1.5% over temperature), maintains reset for ≥140ms after VCC recovery, draws only 17µA typical supply current at +25°C, and guarantees valid reset operation down to VCC = +1V. It is used in automotive ECUs and battery-powered instrumentation requiring AEC-Q100-compliant power monitoring.
For engineers reviewing the MAX809REXR+T10 datasheet, MAX809REXR+T10 pinout, MAX809REXR+T10 application, or MAX809REXR+T10 equivalent, this page delivers verified electrical parameters, SC70-3 package details, reset timing behavior across -40°C to +125°C, and validated alternatives for +2.5V supply supervision in safety-critical portable and automotive designs.
Technical Context
The MAX809REXR+T10 implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to detect VCC droop below its factory-trimmed 2.63V threshold. Its internal reset timer ensures minimum 140ms assertion time after VCC rises above threshold, with timeout extended up to 460ms at high temperature in SC70 packaging.
It features push-pull output logic that actively drives RESET low during fault conditions and high during normal operation - eliminating external pullup requirements. The device ignores transients ≤20µs at 100mV overdrive and remains functional with VCC as low as 1.0V, enabling robust brownout detection in low-voltage microcontroller systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±1.5% over -40°C to +125°C - ensures reliable detection of +2.5V supply collapse before system instability occurs |
| Reset Timeout | ≥140ms min after VCC recovery - provides sufficient time for microcontroller core and peripherals to stabilize post-power-up |
| Supply Current | 17µA typical at +25°C, VCC = 2.5V - enables multi-year operation in coin-cell–powered IoT sensors |
| Operating Voltage Range | 1.2V to 5.5V - supports operation during deep brownout while maintaining reset validity down to 1.0V |
| Output Type | Push-pull active-low RESET - eliminates need for external pullup resistor and simplifies interface to CMOS reset inputs |
| Temperature Range | -40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 Grade 0 |
| Package | SC70-3 (X3+2) - 1.25mm × 0.85mm footprint compatible with high-density PCB layouts |
Pinout & Package
MAX809REXR+T10 is housed in a 3-pin SC70 package (package code X3+2), measuring 1.25mm × 0.85mm × 0.95mm, with gull-wing leads and RoHS-compliant matte tin plating. Pin 1 is GND, Pin 2 is RESET (push-pull active-low), and Pin 3 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Provides return path for internal comparator and output stage; must be connected directly to system ground plane |
| RESET (Pin 2) | Active-low reset signal output | Drives low during VCC fault or startup; actively pulls high when VCC > 2.63V - no external pullup required |
| VCC (Pin 3) | Supply input | Monitored +2.5V rail input; powers internal circuitry and defines reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.63V threshold | ±1.5% tolerance over full -40°C to +125°C range - eliminates need for external trimming in +2.5V systems |
| 140ms minimum reset pulse | Guaranteed assertion time ensures microcontroller initialization completes before release |
| 1.2V minimum operating voltage | Valid reset signaling continues even during severe brownout - prevents spurious wake-up |
| Transient immunity | Immune to VCC glitches ≤20µs at 100mV overdrive - avoids false resets in noisy automotive environments |
| AEC-Q100 qualification | Qualified to Grade 0 (-40°C to +125°C) - meets automotive reliability and stress-test requirements |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Glucose Monitor |
|---|---|
Use Scenario: Monitors +2.5V sensor bias rail in engine control module exposed to under-hood thermal cycling and load dump transients. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low RESET to MCU during supply sag caused by alternator ripple or cold-crank voltage drop. Use Value: Prevents firmware corruption by holding MCU in reset until +2.5V rail stabilizes above 2.63V for ≥140ms - critical for ASIL-B compliance. |
Use Scenario: Powers glucose sensor interface circuitry in handheld diagnostic device using single CR2032 coin cell. IC Role / Device Role / Timing Role: Reset supervisor ensuring clean boot sequence when battery voltage decays from 3.0V to 2.5V during end-of-life discharge. Use Value: 17µA quiescent current extends battery life beyond 2 years; 1.2V operation guarantees reset remains valid until battery reaches 1.0V. |
| Industrial PLC I/O Module | Smart Energy Meter MCU Subsystem |
Use Scenario: Secures digital I/O channel initialization in DIN-rail mounted programmable logic controller operating in factory ambient up to +70°C. IC Role / Device Role / Timing Role: Power-on reset generator synchronizing FPGA configuration and ARM Cortex-M4 boot sequence. Use Value: SC70-3 footprint minimizes PCB area; push-pull output eliminates BOM cost and layout complexity of external pullup resistor. |
Use Scenario: Supervises +2.5V ADC reference and real-time clock supply in utility-grade electricity meter subject to wide seasonal temperature swings. IC Role / Device Role / Timing Role: Brownout detector triggering safe shutdown and nonvolatile memory write before VCC collapses below 2.5V nominal. Use Value: 30ppm/°C tempco ensures reset threshold drift stays within ±15mV across -25°C to +70°C field environment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | SOT23-3 package, -40°C to +105°C rating, 2.93V threshold | Targeted at industrial controllers where 2.93V threshold matches +3.0V supplies; lower max temperature grade | Select when +3.0V rail supervision is needed and SC70 size is not required |
| TPS3123E12DBVR | Texas Instruments part with 2.63V threshold, SOT23-3, 1.8V–5.5V VCC range, 1.5% accuracy | Same threshold but wider VCC range and higher max supply voltage; lacks AEC-Q100 qualification | Use in commercial-grade +2.5V systems where automotive qualification is unnecessary |
Compared with MAX809REXR+T10, MAX809SEUR+T offers identical reset functionality but trades SC70 miniaturization and +125°C capability for SOT23 manufacturability and lower cost in non-automotive settings; TPS3123E12DBVR provides comparable accuracy and voltage range but requires external validation for automotive deployment due to missing AEC-Q100 certification.
Availability
MAX809REXR+T10 is available at Aetrix Electronics and suitable for automotive ECU design, portable medical instrumentation, industrial PLC modules, and smart energy meter development requiring stable component supply with guaranteed long-term availability.
Supply support for MAX809REXR+T10 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated, now part of Analog Devices, designs precision analog and mixed-signal ICs for automotive, industrial, and communications markets, with emphasis on high-reliability power management and sensing solutions.
The MAX809 family delivers compact, low-power microprocessor supervisory circuits optimized for +2.5V to +5V supply monitoring in space-constrained and thermally demanding applications such as automotive control units and portable instrumentation.
FAQ
What is the exact reset threshold voltage of the MAX809REXR+T10 and how does it vary with temperature?
The MAX809REXR+T10 has a factory-trimmed reset threshold of 2.63V at +25°C, with guaranteed tolerance of ±1.5% over the full -40°C to +125°C operating range. Its temperature coefficient is 30ppm/°C, resulting in maximum deviation of ±15mV across the specified temperature span - confirmed in the Electrical Characteristics table under "Reset Threshold (SC70 only)" for MAX8__R versions.
Does the MAX809REXR+T10 require an external pullup resistor on the RESET pin?
No, the MAX809REXR+T10 uses a push-pull output stage, so it actively drives RESET high during normal operation and low during reset - no external pullup resistor is needed. This differs from the open-drain MAX803 series and simplifies schematic design and BOM management for the MAX809REXR+T10.
Is the MAX809REXR+T10 qualified for automotive applications?
Yes, the MAX809REXR+T10 is AEC-Q100 qualified to Grade 0 (-40°C to +125°C), as explicitly stated in the Benefits and Features section of the datasheet. Its SC70-3 package, 125°C max operating temperature, and transient immunity make it suitable for under-hood automotive microcontroller supervision.
What is the minimum supply voltage at which the MAX809REXR+T10 guarantees valid RESET output behavior?
The MAX809REXR+T10 guarantees correct RESET logic state down to VCC = +1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics sections. Below 1.0V, output behavior is not guaranteed - this ensures deterministic reset assertion during brownout conditions common in battery-powered automotive subsystems.
How does the reset timeout duration of the MAX809REXR+T10 change with temperature?
The MAX809REXR+T10's reset timeout is ≥140ms minimum across all temperatures, but increases with junction temperature: at -40°C to +85°C it ranges 140–460ms, and at +85°C to +125°C it extends to 100–840ms. This variation is documented in the "Reset Active Timeout Period (SC70)" row of the Electrical Characteristics table.
MAX809REXR+T10 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX809REXR+T10 FAQ
1.How can I place an order for MAX809REXR+T10 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809REXR+T10 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX809REXR+T10 reliable?
The price and inventory of MAX809REXR+T10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809REXR+T10 is usually 5 days.
3.What payment methods are accepted for MAX809REXR+T10?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809REXR+T10?
MAX809REXR+T10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809REXR+T10 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX809REXR+T10?
For technical support, including MAX809REXR+T10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809REXR+T10 requirements.
6.How does Aetrix verify that MAX809REXR+T10 is sourced from the original manufacturer or authorized distributors?
All MAX809REXR+T10 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX809REXR+T10 meets industry standards.
7.What is the process for return or replacement of MAX809REXR+T10?
All MAX809REXR+T10 units undergo pre-shipment inspection (PSI). If there is an issue with MAX809REXR+T10, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX809REXR+T10 part is unused and in its original packaging.
Return procedure for MAX809REXR+T10:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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