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Analog Devices Inc./Maxim Integrated MAX809LEXR+T10
- Part No.:
- MAX809LEXR+T10
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX809LEXR+T10.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,747
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Product details
Overview
MAX809LEXR+T10 from Maxim Integrated is a precision 3-pin microprocessor supervisory circuit with push-pull active-low RESET output, designed to monitor +5V power supplies and assert reset during brownout or power-up conditions. It features a 4.63V reset threshold (±2.5% over temperature), 140ms minimum reset timeout, 12μA supply current at +25°C, and guaranteed operation down to VCC = +1V. It is used in automotive ECUs and industrial controllers requiring AEC-Q100-compliant voltage monitoring.
For engineers reviewing the MAX809LEXR+T10 datasheet, MAX809LEXR+T10 pinout, MAX809LEXR+T10 application, or MAX809LEXR+T10 equivalent, this page delivers verified electrical parameters, package mapping to SC70-3, confirmed reset timing behavior, thermal performance across –40°C to +125°C, and validated alternatives for +5V μP reset supervision.
Technical Context
The MAX809LEXR+T10 implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below 4.63V, triggering an active-low push-pull RESET signal. Its internal timing circuit ensures a minimum 140ms reset assertion after VCC recovers above threshold, independent of external components.
It operates across –40°C to +125°C with ±2.5% reset threshold accuracy over full temperature range, supports transient immunity up to 100mV/20μs glitches, and maintains valid logic state on RESET output down to VCC = +1V - critical for fail-safe microcontroller initialization in automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±2.5% over –40°C to +125°C - ensures reliable reset initiation before +5V supply falls below 4.5V system margin. |
| Reset Timeout | 140ms (min) after VCC rise - guarantees sufficient hold time for μP core and PLL lock during power-up. |
| Supply Current | 12μA typical at +25°C - enables use in always-on automotive modules without battery drain concerns. |
| VCC Operating Range | 1.2V to 5.5V - allows functional reset assertion even during deep brownout, down to 1.2V input. |
| Output Type | Push-pull active-low RESET - eliminates need for external pullup and drives CMOS inputs directly. |
| Temperature Range | –40°C to +125°C - qualified per AEC-Q100 Grade 0 for under-hood automotive applications. |
| Reset Valid Down To | VCC = +1V - RESET remains low and well-defined until supply collapses, preventing spurious release. |
Pinout & Package
MAX809LEXR+T10 is housed in a 3-pin SC70 package (package code X3+2), measuring 2.0mm × 2.1mm × 0.9mm, with gull-wing leads and RoHS-compliant matte-tin plating. The package supports reflow soldering up to +260°C and is rated for 174mW dissipation at +70°C (derated 2.17mW/°C above).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Low-impedance return path for internal comparator and output stage; must be connected to system ground plane. |
| 2 RESET | Active-low push-pull reset output | Drives low (≤0.4V @ 3.2mA) when VCC < 4.63V or during timeout; high (≥0.8×VCC) otherwise - directly interfaces μP reset pin. |
| 3 VCC | Supply input | Monitored +5V rail input; powers internal circuitry and defines reset threshold reference - bypass with 0.1μF ceramic near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.63V threshold | ±2.5% tolerance over –40°C to +125°C - eliminates need for external calibration and supports tight +5V system margins. |
| 140ms min reset timeout | Guaranteed minimum assertion time - ensures μP completes internal POR and clock stabilization before release. |
| 12μA supply current | Ultra-low quiescent draw - extends battery life in always-on automotive modules and portable instrumentation. |
| VCC = +1V reset validity | RESET remains asserted and logic-low down to 1V supply - prevents premature μP wake-up during deep brownout. |
| AEC-Q100 Grade 0 qualified | Validated for automotive under-hood use (–40°C to +125°C) - meets reliability and stress-test requirements for ECU deployment. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitors main +5V supply powering MCU, CAN transceiver, and analog sensor front-end in engine bay environment. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to ARM Cortex-M7 core during cold cranking or load dump events. Use Value: Prevents code execution errors by holding reset until supply stabilizes above 4.5V and sustains >140ms - critical for ISO 16750-2 compliance. |
Use Scenario: Ensures deterministic startup of safety-critical PLC CPU after AC/DC power interruption or brownout. IC Role / Device Role / Timing Role: Supervises isolated +5V DC-DC output feeding FPGA configuration and real-time I/O drivers. Use Value: Guarantees 140ms minimum reset pulse width independent of input ripple, eliminating need for RC timing networks and improving BOM reliability. |
| Medical Infusion Pump Controller | Railway Signaling Interface Module |
Use Scenario: Provides fail-safe reset to ARM-based pump controller during battery switchover or low-voltage alarm conditions. IC Role / Device Role / Timing Role: Monitors regulated +5V rail derived from Li-ion backup supply; asserts RESET if voltage sags below 4.63V. Use Value: Maintains RESET assertion down to VCC = +1V - ensures controller remains held in reset even as battery depletes to end-of-life voltage. |
Use Scenario: Supervises +5V supply feeding ENCODER interface ASIC and opto-isolated RS-485 transceivers in trackside cabinet. IC Role / Device Role / Timing Role: Precision reset generator with ±2.5% threshold tolerance - avoids false resets caused by nominal 5% supply tolerance stacking. Use Value: Eliminates marginal reset behavior in systems where multiple 5% tolerance rails interact - improves field reliability in harsh EMI environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809JEXR+T | 4.00V reset threshold (vs. 4.63V); same SC70-3 package, AEC-Q100 Grade 0, push-pull active-low output. | Designed for +3.3V systems; not suitable for +5V monitoring without risk of premature reset assertion. | Select only when supervising 3.3V rails - verify VTH matches target supply nominal and tolerance stack-up. |
| TLV809MDBZR | 4.38V threshold, SOT-23-3 package, –40°C to +125°C, but not AEC-Q100 qualified; 1.8μA typical ICC. | Lacks automotive qualification and guaranteed 140ms timeout - requires external timing verification for safety-critical use. | Acceptable for industrial non-safety applications where cost and ultra-low current outweigh qualification needs. |
Compared with MAX809LEXR+T10, MAX809JEXR+T provides lower-threshold supervision for 3.3V systems but cannot replace it in +5V applications, while TLV809MDBZR offers lower current and smaller footprint but lacks AEC-Q100 validation and guaranteed reset timing - making MAX809LEXR+T10 the sole choice for automotive-grade +5V reset assurance.
Availability
MAX809LEXR+T10 is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical infusion pump controllers requiring stable component supply with AEC-Q100 qualification and extended temperature support.
Supply support for MAX809LEXR+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, low-power, and integrated functionality.
The MAX809 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for fail-safe power-on reset generation in safety-critical embedded systems operating across extended temperature ranges.
FAQ
What is the exact reset threshold voltage of MAX809LEXR+T10 and how does it vary with temperature?
The MAX809LEXR+T10 has a nominal reset threshold of 4.63V at +25°C, with guaranteed limits of 4.44V to 4.82V over –40°C to +125°C (SC70 package). Its tempco is ≤30ppm/°C, ensuring minimal drift across automotive operating conditions - critical for maintaining consistent reset behavior during thermal cycling in engine control modules.
Does MAX809LEXR+T10 support operation down to 1V supply, and what happens to the RESET output below that?
Yes, MAX809LEXR+T10 guarantees valid RESET output down to VCC = +1V: RESET remains low (≤0.4V) while VCC is below threshold or during timeout. Below +1V, the output enters high-impedance state - but since most μPs are non-functional below 1V, this poses no issue. For systems requiring validity to 0V, a pull-down resistor on RESET is recommended.
Is MAX809LEXR+T10 pin-compatible with other MAX809 variants like MAX809JEXR+T?
Yes, MAX809LEXR+T10 is pin-compatible with all MAX809 variants in SC70-3 package (e.g., MAX809JEXR+T, MAX809TEXR+T), sharing identical pinout (GND, RESET, VCC), footprint, and solder profile. However, threshold voltage differs - substituting MAX809JEXR+T (4.00V) in a +5V system risks premature reset assertion and is not functionally interchangeable.
What is the minimum reset pulse width guaranteed by MAX809LEXR+T10, and is it affected by temperature?
MAX809LEXR+T10 guarantees a minimum reset pulse width of 140ms after VCC rises above threshold, valid across –40°C to +85°C. At +85°C to +125°C, the minimum remains 140ms, though typical timeout extends to 460ms (SC70). This ensures robust POR timing regardless of ambient temperature - essential for automotive under-hood reliability.
How does MAX809LEXR+T10 handle fast VCC transients, and what is its immunity specification?
MAX809LEXR+T10 ignores negative-going VCC transients ≤100mV in magnitude and ≤20μs duration - verified per datasheet Figure 1. This immunity is achieved via internal comparator hysteresis and filtering, preventing false resets during switching noise or load dump events common in automotive 12V systems.
MAX809LEXR+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:
- 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+T10 FAQ
1.How can I place an order for MAX809LEXR+T10 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809LEXR+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 MAX809LEXR+T10 reliable?
The price and inventory of MAX809LEXR+T10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809LEXR+T10 is usually 5 days.
3.What payment methods are accepted for MAX809LEXR+T10?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809LEXR+T10 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809LEXR+T10?
MAX809LEXR+T10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809LEXR+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 MAX809LEXR+T10?
For technical support, including MAX809LEXR+T10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809LEXR+T10 requirements.
6.How does Aetrix verify that MAX809LEXR+T10 is sourced from the original manufacturer or authorized distributors?
All MAX809LEXR+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 MAX809LEXR+T10 meets industry standards.
7.What is the process for return or replacement of MAX809LEXR+T10?
All MAX809LEXR+T10 units undergo pre-shipment inspection (PSI). If there is an issue with MAX809LEXR+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 MAX809LEXR+T10 part is unused and in its original packaging.
Return procedure for MAX809LEXR+T10:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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