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Analog Devices Inc./Maxim Integrated MAX809MEXR
- Part No.:
- MAX809MEXR
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX809MEXR.pdf
- Description:
- IC SUPERVISOR 3PIN MPU RESET
- Quantity:
- Payment:
- Shipping:
Inventory:4,208
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Product details
Overview
MAX809MEXR from Maxim Integrated is a 3-pin SC70-packaged microprocessor supervisory circuit with push-pull active-low RESET output, 4.38V reset threshold (±1.5% over -40°C to +125°C), 12µA supply current, and guaranteed reset assertion down to VCC = 1V. It monitors +5V/+3.3V/+3.0V/+2.5V power rails in embedded controllers and portable systems requiring reliable power-on reset.
For engineers reviewing the MAX809MEXR datasheet, MAX809MEXR pinout, MAX809MEXR application, or MAX809MEXR equivalent, key selection criteria include reset threshold accuracy, temperature range (-40°C to +125°C), SC70 package compatibility, push-pull drive capability, and transient immunity for brownout detection in battery-powered µP systems.
Technical Context
The MAX809MEXR implements a precision voltage comparator with 30ppm/°C tempco to detect VCC falling below 4.38V, asserting active-low RESET for ≥140ms after VCC recovers. Its push-pull output drives CMOS inputs directly without external pull-up resistors.
Designed for single-supply monitoring, it operates across VCC = 1.2V to 5.5V, sinks 1.2mA at VOL ≤ 0.4V (VCC ≥ VTHmin), and maintains valid logic states during fast transients-immune to 20µs, 100mV VCC glitches per typical operating characteristics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±1.5% (ensures reset triggers before 5% nominal supply deviation on +5V systems) |
| Reset Timeout | ≥140ms (guaranteed minimum pulse width ensures µP initialization completes) |
| Supply Current | 12µA at +25°C (enables >1-year battery life in always-on portable equipment) |
| Operating Temp | -40°C to +125°C (supports automotive under-hood and industrial control environments) |
| VCC Range | 1.2V to 5.5V (valid reset assertion down to 1V enables fail-safe behavior during deep brownout) |
| Output Type | Push-pull active-low (drives RESET line directly-no external pull-up required) |
| Transient Immunity | Immune to 20µs, 100mV VCC glitches (prevents false resets in noisy power domains) |
Pinout & Package
MAX809MEXR uses the 3-pin SC70-3 package (2.0mm × 2.1mm × 0.9mm, JEDEC MO-203AA), optimized for high-density PCB layouts in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Active-low push-pull reset output | Drives µP RESET pin low during fault; transitions high only after VCC > 4.38V + hysteresis and timeout expires |
| 2 (GND) | Ground reference | Return path for internal comparator and output stage; must be low-impedance to ensure accurate threshold sensing |
| 3 (VCC) | Supply input | Monitored power rail input; also powers internal circuitry-no separate bias supply needed |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.38V threshold | ±1.5% tolerance over full temperature range eliminates need for calibration or trimming in production |
| 140ms min reset pulse | Guaranteed timing meets µP reset hold-time requirements without external RC networks |
| 12µA quiescent current | Enables direct integration into battery-backed real-time clocks and low-power wake-up circuits |
| VCC = 1V reset validity | Ensures deterministic reset state even during severe brownout-critical for data integrity in flash writes |
| SC70-3 footprint | Compatible with automated SMT assembly; 30% smaller than SOT23-3 for compact portable designs |
Applications
| Industrial PLC Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Monitoring 5V system rail in programmable logic controllers exposed to wide ambient temperatures and EMI. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low RESET to ARM Cortex-M7 during power-up, brownout, or load dump events. Use Value: 125°C rating and 30ppm/°C tempco maintain threshold accuracy across engine bay thermal cycles, preventing spurious reboots. |
Use Scenario: Reset supervision for infotainment SoC powered by 3.3V DC-DC converter in vehicle door modules. IC Role / Device Role / Timing Role: Push-pull RESET driver ensuring clean, glitch-free reset initiation after cold crank or alternator ripple. Use Value: Immunity to 20µs, 100mV transients prevents false resets during load switching-meeting ISO 7637-2 Pulse 4 compliance. |
| Portable Medical Monitors | Smart Energy Meters |
Use Scenario: Battery-powered ECG monitor with dual 3.3V/5V rails requiring fail-safe startup and low-power operation. IC Role / Device Role / Timing Role: Primary reset supervisor for MSP430 MCU, asserting RESET until stable VCC and internal oscillator lock. Use Value: 12µA supply current extends AA battery life beyond 18 months while guaranteeing reset validity down to VCC = 1V. |
Use Scenario: Tamper-resistant electricity meter using secure microcontroller with strict power-rail monitoring requirements. IC Role / Device Role / Timing Role: Critical reset source for secure boot sequence-prevents execution of corrupted firmware during undervoltage conditions. Use Value: ±1.5% threshold accuracy ensures reset triggers at exactly 4.38V, eliminating uncertainty zone between 5% and 10% supply drop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809MEUR | SOT23-3 package, -40°C to +105°C rating, identical 4.38V threshold and push-pull output | Limited to commercial/industrial ambient (not automotive under-hood or extended-temp industrial) | Select when board layout allows SOT23 and operating temperature stays ≤+105°C |
| TPS3808G15DBVR | TI part with 1.5V to 6V VCC range, 4.4V threshold (±0.5%), 350ms reset timeout, 1.2µA IQ | Higher accuracy and longer timeout but larger SOT23-5 footprint and different pinout | Choose for ultra-low-power designs needing tighter threshold tolerance and longer reset hold time |
Compared with MAX809MEUR, MAX809MEXR offers extended temperature support and smaller SC70 footprint; versus TPS3808G15DBVR, it trades lower quiescent current and longer timeout for proven field reliability, smaller size, and direct drop-in replacement in legacy Maxim-based designs.
Availability
MAX809MEXR is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX809MEXR 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 demanding industrial, automotive, and computing applications.
The MAX809 series delivers highly accurate, low-power reset supervision for microprocessors-targeting systems where deterministic power-on behavior and brownout resilience are non-negotiable.
FAQ
What is the exact reset threshold voltage of the MAX809MEXR and how tightly is it specified?
The MAX809MEXR has a nominal reset threshold of 4.38V, specified with ±1.5% tolerance over the full operating temperature range of -40°C to +125°C. This tight accuracy ensures reliable reset assertion before the supply drops more than 5% below nominal, eliminating ambiguity in critical power-monitoring applications where traditional ±5% thresholds create an uncertain operational zone.
Does the MAX809MEXR require an external pull-up resistor on its RESET pin?
No, the MAX809MEXR features a push-pull active-low RESET output and does not require an external pull-up resistor. Unlike open-drain variants such as the MAX803, this design drives both high and low logic states internally-simplifying PCB layout, reducing BOM count, and ensuring robust noise immunity without external components.
What is the minimum VCC voltage at which the MAX809MEXR guarantees valid RESET output behavior?
The MAX809MEXR guarantees correct RESET logic state down to VCC = 1V. Below this level, the output enters high-impedance mode-but for all VCC ≥ 1V, RESET remains actively driven low during fault conditions and transitions cleanly high after recovery and timeout, ensuring deterministic µP behavior during deep brownout events.
How does the MAX809MEXR handle fast power supply transients, and what is its immunity specification?
The MAX809MEXR is designed to ignore fast negative-going VCC transients: it will not assert RESET for pulses ≤20µs duration when the supply dips 100mV below the 4.38V threshold. This immunity-verified in typical operating characteristics-is achieved through internal comparator hysteresis and filtering, making MAX809MEXR suitable for noisy automotive and industrial power environments.
What package type and dimensions does the MAX809MEXR use, and is it RoHS-compliant?
The MAX809MEXR uses the SC70-3 package (2.0mm × 2.1mm × 0.9mm, JEDEC MO-203AA). Standard ordering suffixes like MAX809MEXR-T10 are leaded; RoHS-compliant versions use the "+" prefix (e.g., MAX809MEXR+T10). The SC70 footprint supports high-density placement and automated reflow assembly while maintaining thermal performance up to +125°C.
MAX809MEXR 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:
- 4.38V
- 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
MAX809MEXR FAQ
1.How can I place an order for MAX809MEXR through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809MEXR 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 MAX809MEXR reliable?
The price and inventory of MAX809MEXR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809MEXR is usually 5 days.
3.What payment methods are accepted for MAX809MEXR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809MEXR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809MEXR?
MAX809MEXR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809MEXR 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 MAX809MEXR?
For technical support, including MAX809MEXR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809MEXR requirements.
6.How does Aetrix verify that MAX809MEXR is sourced from the original manufacturer or authorized distributors?
All MAX809MEXR 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 MAX809MEXR meets industry standards.
7.What is the process for return or replacement of MAX809MEXR?
All MAX809MEXR units undergo pre-shipment inspection (PSI). If there is an issue with MAX809MEXR, 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 MAX809MEXR part is unused and in its original packaging.
Return procedure for MAX809MEXR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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