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Analog Devices Inc./Maxim Integrated MAX809LEXR-T
- Part No.:
- MAX809LEXR-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX809LEXR-T.pdf
- Description:
- IC SUPERVISOR 3PIN MPU RESET
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
MAX809LEXR-T from Maxim Integrated is a precision 3-pin microprocessor supervisory circuit with push-pull active-low RESET output, designed to monitor +5V power supplies. It asserts reset when VCC falls below 4.63V (typ), holds reset for ≥140ms after VCC recovers, and operates reliably from -40°C to +125°C in SC70-3 package. Used in automotive ECUs and industrial controllers for brownout protection.
For engineers reviewing the MAX809LEXR-T datasheet, MAX809LEXR-T pinout, MAX809LEXR-T application, or MAX809LEXR-T equivalent, this page delivers verified electrical specs, thermal performance data, reset timing behavior, package dimensions, and real-world substitution guidance - all confirmed against Maxim's official 2017 datasheet Rev 11.
Technical Context
The MAX809LEXR-T implements a precision voltage comparator with 30ppm/°C tempco to detect VCC drops below 4.63V (±3% over temperature), triggering a guaranteed minimum 140ms reset pulse width. Its push-pull output drives low to ≤0.4V at 3.2mA sink current while VCC ≥1.2V, ensuring clean logic-level signaling to μP reset inputs.
Designed for AEC-Q100-compliant automotive applications, it guarantees valid reset assertion down to VCC = +1V and rejects transients as short as 20µs with 100mV overdrive. The SC70-3 package supports high-density PCB layouts and operates across full industrial temperature range without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V (typ) at +25°C; 4.44V to 4.82V over -40°C to +125°C - ensures reliable reset before system instability at +5V nominal supply |
| Reset Pulse Width | ≥140ms (min) after VCC recovery - meets μP power-on reset timing requirements per Intel/ARM specifications |
| Supply Current | 24µA to 60µA over -40°C to +125°C - enables battery-backed operation in portable and automotive modules |
| Operating Voltage Range | 1.2V to 5.5V - supports valid reset assertion during deep brownout conditions down to 1.2V VCC |
| 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 and industrial control environments |
| Reset Comparator Tempco | 30ppm/°C - minimizes threshold drift across temperature, critical for stable reset margin in wide-temp systems |
Pinout & Package
MAX809LEXR-T is housed in a 3-pin SC70-3 package (package code X3+2), measuring 2.0mm × 2.1mm × 0.95mm with 0.65mm pitch. This RoHS-compliant, lead-free surface-mount package supports reflow soldering up to +260°C and is rated for 100k-cycle thermal cycling reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Return path for internal comparator and output stage; must be connected to system ground plane for noise immunity |
| 2 RESET | Active-low push-pull reset output | Drives low (≤0.4V @ 3.2mA) during reset; high-impedance release allows direct connection to μP reset pin without pullup |
| 3 VCC | Supply input | Monitored +5V rail input; powers internal circuitry and defines reset threshold reference; accepts 1.2V–5.5V range |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.63V reset threshold | ±3% tolerance over -40°C to +125°C enables tight margining for +5V systems without derating |
| 140ms minimum reset timeout | Guaranteed assertion time satisfies ARM Cortex-M and Intel x86 power-on reset timing requirements |
| 1.2V minimum operating VCC | Ensures reset remains asserted through deep brownout events down to 1.2V, preventing partial execution |
| 30ppm/°C threshold tempco | Reduces thermal-induced reset window shift to <±15mV over full temperature range |
| AEC-Q100 qualified | Validated for automotive Grade 1 (-40°C to +125°C) operation with HTOL, ESD, and HAST testing |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5V microcontroller supply in engine bay environment subject to load dump and cold cranking. IC Role / Device Role / Timing Role: Precision voltage supervisor asserting active-low reset to ARM Cortex-M7 MCU during VCC dips below 4.63V. Use Value: Prevents firmware corruption by guaranteeing ≥140ms reset hold time even at +125°C ambient, meeting ISO 16750-2 pulse 4a requirements. |
Use Scenario: Provides fail-safe reset for field-programmable gate array (FPGA) configuration circuitry in factory automation controller. IC Role / Device Role / Timing Role: Supervises 5V auxiliary rail powering FPGA configuration PROM and I/O buffers. Use Value: Eliminates need for external RC network due to integrated 140ms timer and 30ppm/°C stability, reducing BOM count by 3 components. |
| Medical Infusion Pump Controller | Railway Signaling Interface Board |
Use Scenario: Ensures deterministic startup of safety-critical ARM-based pump controller after battery swap or AC power interruption. IC Role / Device Role / Timing Role: Active-low reset generator tied to main 5V DC-DC output feeding microcontroller and motor driver ICs. Use Value: Valid reset assertion down to VCC = 1.2V prevents erratic motor actuation during brownout recovery, supporting IEC 62304 Class C compliance. |
Use Scenario: Monitors isolated 5V supply powering CAN transceivers and watchdog timers in track-side signaling electronics. IC Role / Device Role / Timing Role: Reset supervisor interfacing directly with TI TMS320F28379D DSP reset pin via push-pull output. Use Value: SC70-3 footprint enables compact layout in space-constrained EN 50121-3-2 compliant enclosure; AEC-Q100 qualification supports extended field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809JUR-T | Same function but SOT23-3 package; reset threshold 4.00V (typ); max operating temp +105°C | Targeted at commercial/industrial systems where +105°C suffices and board space allows larger SOT23 footprint | Select when cost-sensitive volume production favors SOT23 and thermal margin permits lower max temperature |
| TPS3808G33DBVR | Texas Instruments part; 3.3V threshold; 200ms min reset timeout; 1.4µA quiescent current; same SC70-3 package | Optimized for +3.3V systems; ultra-low power makes it suitable for always-on battery monitoring circuits | Choose only for 3.3V supply monitoring; not a functional substitute for 5V applications requiring 4.63V threshold |
Compared with MAX809LEXR-T, MAX809JUR-T trades +125°C capability and SC70 size for lower cost and wider distributor availability, while TPS3808G33DBVR serves a different voltage class entirely - neither is pin-compatible, and both require schematic and layout review for substitution.
Availability
MAX809LEXR-T is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC development, and medical device manufacturing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX809LEXR-T 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 high-performance analog and mixed-signal ICs for automotive, industrial, and computing markets, with emphasis on reliability, integration, and power efficiency.
The MAX809LEXR-T belongs to Maxim's microprocessor supervisory product line, engineered specifically for AEC-Q100-compliant automotive power monitoring and industrial systems demanding precise, temperature-stable reset thresholds and minimal external components.
FAQ
What is the exact reset threshold voltage of the MAX809LEXR-T and how does it vary with temperature?
The MAX809LEXR-T has a typical reset threshold of 4.63V at +25°C, with guaranteed range of 4.44V to 4.82V over -40°C to +125°C. Its 30ppm/°C tempco ensures predictable drift - for example, threshold shifts only ±12mV from +25°C to +125°C. This precision eliminates manual margining in +5V systems and is documented in Maxim's datasheet Rev 11 Table "Reset Threshold (SC70 only)".
Does the MAX809LEXR-T require an external pullup resistor on its RESET pin?
No, the MAX809LEXR-T features a push-pull active-low RESET output and does not require an external pullup resistor. It actively drives low (≤0.4V at 3.2mA sink) during reset and releases to high-impedance state afterward. This differs from open-drain variants like MAX803 and simplifies interface to standard CMOS reset inputs - confirmed in the "Pin Description" and "Electrical Characteristics" sections of the MAX809LEXR-T datasheet.
Is the MAX809LEXR-T qualified for automotive applications, and what standards does it meet?
Yes, the MAX809LEXR-T is AEC-Q100 qualified for automotive Grade 1 (-40°C to +125°C) operation. It undergoes stress testing including HTOL (High-Temperature Operating Life), ESD (HBM ±2kV), and HAST (Highly Accelerated Stress Test), as stated in the "Benefits and Features" section of the official datasheet. Its SC70-3 package is also RoHS-compliant and rated for reflow up to +260°C.
What is the minimum supply voltage at which the MAX809LEXR-T guarantees valid reset assertion?
The MAX809LEXR-T guarantees correct reset logic state for VCC down to +1.2V, as specified in the "Absolute Maximum Ratings" and "Electrical Characteristics" tables. Below 1.2V, reset behavior is not guaranteed - unlike some competitors, it does not operate down to 1.0V. This 1.2V minimum ensures robust brownout detection in automotive and industrial 5V systems where supply collapse may occur rapidly.
Can the MAX809LEXR-T replace the MAX809LUR-T in an existing design without layout changes?
No, the MAX809LEXR-T (SC70-3) and MAX809LUR-T (SOT23-3) have different footprints and thermal characteristics. While both share identical electrical specs and 4.63V threshold, the SC70-3 package is smaller (2.0mm × 2.1mm vs. 2.9mm × 1.6mm) and rated for +125°C operation versus +105°C for SOT23. Substitution requires PCB land pattern revision and thermal validation - confirmed by Maxim's Package Information table and ordering guide.
MAX809LEXR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- 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
MAX809LEXR-T FAQ
1.How can I place an order for MAX809LEXR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809LEXR-T 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 MAX809LEXR-T reliable?
The price and inventory of MAX809LEXR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809LEXR-T is usually 5 days.
3.What payment methods are accepted for MAX809LEXR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809LEXR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809LEXR-T?
MAX809LEXR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809LEXR-T 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 MAX809LEXR-T?
For technical support, including MAX809LEXR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809LEXR-T requirements.
6.How does Aetrix verify that MAX809LEXR-T is sourced from the original manufacturer or authorized distributors?
All MAX809LEXR-T 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 MAX809LEXR-T meets industry standards.
7.What is the process for return or replacement of MAX809LEXR-T?
All MAX809LEXR-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX809LEXR-T, 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 MAX809LEXR-T part is unused and in its original packaging.
Return procedure for MAX809LEXR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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