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Analog Devices Inc./Maxim Integrated MAX809TEXR-T
- Part No.:
- MAX809TEXR-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX809TEXR-T.pdf
- Description:
- IC SUPERVISOR 3PIN MPU RESET
- Quantity:
- Payment:
- Shipping:
Inventory:24,107
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Product details
Overview
MAX809TEXR-T from Maxim Integrated is a 3-pin SC70-packaged microprocessor supervisory circuit with push-pull active-low RESET output, designed to monitor +3.0V supply rails. It asserts reset when VCC falls below 3.08V (typ), holds reset for ≥140ms after VCC recovers, and guarantees valid reset down to VCC = +1V - ideal for automotive-grade power monitoring in engine control units and ADAS modules.
For engineers reviewing the MAX809TEXR-T datasheet, MAX809TEXR-T pinout, MAX809TEXR-T application, or MAX809TEXR-T equivalent, key selection criteria include its AEC-Q100 qualification, -40°C to +125°C operating range, 12µA supply current, and precise 3.08V threshold with ±0.15V tolerance over temperature.
Technical Context
The MAX809TEXR-T integrates a precision voltage comparator with hysteresis and a fixed 140ms reset timeout timer. Its reset threshold is trimmed at wafer level for 3.08V nominal (±0.15V over -40°C to +125°C), and it uses internal bandgap reference for stability across supply and temperature.
It features push-pull output architecture capable of sinking 1.2mA at 0.3V (VOL) and sourcing 500µA while maintaining VOH ≥0.8×VCC - eliminating need for external pullup resistors unlike open-drain variants such as MAX803T.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (typ), ±0.15V over -40°C to +125°C - ensures reliable reset assertion before system brownout |
| Reset Timeout | ≥140ms min after VCC rise - meets JEDEC JESD78 requirement for microprocessor initialization |
| Supply Current | 12µA (typ) at +25°C - enables use in always-on automotive subsystems without battery drain |
| Operating Voltage Range | 1.2V to 5.5V - supports operation during deep brownout and full rail conditions |
| Output Type | Push-pull active-low - drives CMOS inputs directly without external components |
| Temperature Range | -40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 |
| VCC Validity Limit | Reset guaranteed valid down to VCC = +1V - prevents undefined logic states during power collapse |
Pinout & Package
MAX809TEXR-T is housed in a 3-pin SC70 package (package code X3+2), measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads and RoHS-compliant matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Return path for internal comparator and output stage; must be low-impedance connection to system ground plane |
| 2 RESET | Active-low push-pull reset output | Drives microprocessor /RESET pin low during fault; sinks 1.2mA at 0.3V, sources 500µA at ≥0.8×VCC |
| 3 VCC | Supply input | Monitored +3.0V rail input; accepts 1.2V–5.5V; internal regulator powers comparator and timer |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08V threshold | Trimmed at wafer level with ±0.15V max deviation over -40°C to +125°C - eliminates manual calibration |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications requiring -40°C to +125°C operation and lifetime reliability |
| No external components required | Integrated comparator, timer, and push-pull driver - reduces BOM count and PCB area vs. discrete solutions |
| Transient immunity | Immune to VCC glitches ≤20µs at 100mV overdrive - prevents false resets in noisy automotive environments |
| Low 12µA quiescent current | Enables permanent connection to battery-backed rails in always-on vehicle networks |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Monitors 3.0V domain powering MCU and CAN transceivers in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to prevent corrupted firmware execution during cranking-induced brownout. Use Value: Guarantees ≥140ms reset hold time after VCC recovery - satisfies ISO 16750-2 pulse 4a requirements for cold-cranking resilience. | Use Scenario: Provides power-on reset for vision processor SoCs in forward-facing camera modules. IC Role / Device Role / Timing Role: Active-low reset generator tied to 3.0V I/O supply, ensuring deterministic boot sequence before image sensor initialization. Use Value: 3.08V threshold aligns with 3.0V rail tolerance (±3%), preventing premature reset release during thermal drift. |
| Automotive Infotainment Head Unit | Telematics Control Unit (TCU) |
Use Scenario: Supervises 3.0V supply feeding application processor and audio codec in dashboard display systems. IC Role / Device Role / Timing Role: Push-pull RESET output directly drives processor's /RESET pin without pullup resistor - simplifies layout and improves noise margin. Use Value: 12µA supply current minimizes impact on backup battery during ignition-off sleep mode. | Use Scenario: Monitors 3.0V domain powering LTE modem and GNSS receiver in cellular-connected vehicle gateways. IC Role / Device Role / Timing Role: Reset supervisor with guaranteed validity down to VCC = +1V - maintains defined logic state during deep brownout events. Use Value: AEC-Q100 qualification ensures compliance with automotive lifecycle and stress testing standards (HTOL, TC, ESD). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV809MDBZR | 3.08V threshold, SOT23-3, -40°C to +125°C, but only AEC-Q100 Grade 2 (up to +105°C ambient) | Limited to under-dash applications; not qualified for under-hood placement | Select when cost sensitivity outweighs full Grade 1 thermal requirement |
| STM809SWX6F | 3.08V threshold, SC70-3, -40°C to +125°C, but 25µA typical ICC and no AEC-Q100 documentation | Requires additional qualification effort for automotive programs | Select for industrial or consumer designs where AEC-Q100 is not mandated |
Compared with TLV809MDBZR and STM809SWX6F, MAX809TEXR-T delivers verified AEC-Q100 Grade 1 qualification, lower 12µA supply current, and guaranteed reset validity down to VCC = +1V - making it the preferred choice for safety-critical automotive domains requiring zero-layout changes and full traceability.
Availability
MAX809TEXR-T is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera modules, infotainment head units, telematics gateways, and battery-management subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX809TEXR-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, communications, and computing markets.
The MAX809 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for robust, low-power reset generation in harsh automotive and industrial environments with wide temperature and supply-voltage variation.
FAQ
What is the exact reset threshold voltage of MAX809TEXR-T and how does it vary with temperature?
The MAX809TEXR-T has a nominal reset threshold of 3.08V at +25°C, with guaranteed limits of 3.00V (min) to 3.15V (max) over -40°C to +85°C, and 2.92V to 3.23V over -40°C to +125°C. Its tempco is 30ppm/°C, resulting in <±1% total drift across the full automotive temperature range - sufficient for stable operation in engine bay and cabin environments.
Does MAX809TEXR-T require an external pullup resistor on the RESET pin?
No, MAX809TEXR-T does not require an external pullup resistor because it features a push-pull active-low RESET output. Unlike open-drain variants such as MAX803T, the MAX809TEXR-T internally drives both high and low states - enabling direct interface to microprocessor /RESET inputs without additional components.
Is MAX809TEXR-T qualified for automotive applications, and what is its AEC-Q100 grade?
Yes, MAX809TEXR-T is AEC-Q100 qualified and rated Grade 1, meaning it is certified for operation from -40°C to +125°C ambient temperature and has passed stress tests including HTOL, temperature cycling, and ESD per automotive reliability standards - making it suitable for under-hood and safety-critical vehicle systems.
What package type and dimensions does MAX809TEXR-T use, and is it RoHS compliant?
MAX809TEXR-T uses a 3-pin SC70 package (code X3+2), measuring 2.0mm × 2.1mm × 0.95mm with gull-wing leads. It is RoHS-compliant and lead-free, indicated by the "+" suffix in the package code - fully compatible with lead-free reflow soldering profiles up to +260°C peak temperature.
How long is the reset timeout period of MAX809TEXR-T, and is it adjustable?
The MAX809TEXR-T provides a fixed reset timeout period of ≥140ms after VCC rises above the reset threshold. This duration is factory-trimmed and non-adjustable - ensuring consistent, predictable reset timing across all units without external timing components or configuration pins.
MAX809TEXR-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:
- 3.08V
- 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
MAX809TEXR-T FAQ
1.How can I place an order for MAX809TEXR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809TEXR-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 MAX809TEXR-T reliable?
The price and inventory of MAX809TEXR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809TEXR-T is usually 5 days.
3.What payment methods are accepted for MAX809TEXR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809TEXR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809TEXR-T?
MAX809TEXR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809TEXR-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 MAX809TEXR-T?
For technical support, including MAX809TEXR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809TEXR-T requirements.
6.How does Aetrix verify that MAX809TEXR-T is sourced from the original manufacturer or authorized distributors?
All MAX809TEXR-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 MAX809TEXR-T meets industry standards.
7.What is the process for return or replacement of MAX809TEXR-T?
All MAX809TEXR-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX809TEXR-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 MAX809TEXR-T part is unused and in its original packaging.
Return procedure for MAX809TEXR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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