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Analog Devices Inc./Maxim Integrated MAX809REXR-T
- Part No.:
- MAX809REXR-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX809REXR-T.pdf
- Description:
- IC SUPERVISOR 3PIN MPU RESET
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX809REXR-T from Maxim Integrated is a precision microprocessor supervisory circuit in SC70-3 package, providing active-low push-pull reset assertion for +2.5V supply systems. It monitors VCC and asserts RESET when voltage falls below 2.63V (±1.5% over temperature), holds reset for ≥140ms after recovery, and guarantees valid output down to VCC = +1V. Used in automotive-grade embedded controllers requiring AEC-Q100-compliant power monitoring.
For engineers reviewing the MAX809REXR-T datasheet, MAX809REXR-T pinout, MAX809REXR-T application, or MAX809REXR-T equivalent, key selection criteria include its 2.63V reset threshold, SC70-3 footprint, −40°C to +125°C operating range, 12μA supply current, and push-pull active-low output configuration compatible with critical μP reset inputs.
Technical Context
The MAX809REXR-T implements a precision bandgap-based voltage comparator with internal hysteresis to detect VCC droop below its factory-trimmed 2.63V threshold. Its reset timeout logic ensures minimum 140ms assertion after VCC recovers, independent of supply ramp rate.
Designed for automotive environments, it features guaranteed operation from −40°C to +125°C, transient immunity against fast VCC glitches (e.g., ≤20μs at 100mV overdrive), and output validity down to VCC = +1V - enabling reliable reset signaling during deep brownout conditions before system collapse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±1.5% over −40°C to +125°C - ensures reset triggers before +2.5V supply drops below 2.5V × 0.95 = 2.375V, covering full tolerance band. |
| Reset Timeout Duration | ≥140ms after VCC rises above threshold - provides sufficient hold time for μP initialization across all supported supply voltages. |
| Supply Current | 12μA typical at +25°C, ≤60μA at +125°C - enables use in always-on battery-backed subsystems without significant drain. |
| Operating Temperature | −40°C to +125°C - meets AEC-Q100 Grade 0 requirements for under-hood automotive electronics. |
| Output Type | Active-low push-pull - drives RESET line directly without external pullup; sinks ≥1.2mA at VOL ≤0.3V. |
| VCC Range | 1.2V to 5.5V - supports operation during brownout recovery down to 1.2V while maintaining reset assertion integrity. |
| Reset Comparator Tempco | 30ppm/°C - limits threshold drift to <±15mV over full temperature range, ensuring consistent trip point. |
Pinout & Package
MAX809REXR-T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.9mm, 0.65mm pitch), optimized for space-constrained automotive and portable applications. The package is RoHS-compliant and qualified per AEC-Q100.
| 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 output | Drives μP reset input low during fault; sinks ≥1.2mA at VOL ≤0.3V; no external pullup required. |
| 3 - VCC | Supply input | Monitored +2.5V rail input; also powers internal circuitry; accepts 1.2V–5.5V with full functionality. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.63V threshold | Factory-trimmed to ±1.5% over full temperature range - eliminates need for external calibration or margining in +2.5V systems. |
| 140ms minimum reset pulse width | Guaranteed timing independent of VCC ramp rate - ensures μP completes power-on initialization before release. |
| Valid reset output down to VCC = +1V | RESET remains asserted and electrically defined even as supply collapses - prevents spurious release during brownout. |
| Transient immunity | Immune to VCC glitches ≤20μs wide at 100mV overdrive - avoids false resets from EMI or switching noise. |
| AEC-Q100 qualified | Qualified for automotive Grade 0 (−40°C to +125°C) - supports deployment in engine control, ADAS, and body electronics. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors +2.5V sensor reference rail in diesel ECU exposed to under-hood thermal cycling and load dump transients. IC Role / Device Role / Timing Role: Supervisory reset generator asserting active-low signal to ARM Cortex-M7 MCU during supply sag or cold crank. Use Value: Prevents firmware corruption by holding reset until +2.5V stabilizes ≥140ms post-recovery, meeting ISO 16750-2 cold-crank voltage profile. | Use Scenario: Powers field-programmable gate array (FPGA) configuration memory in modular PLC backplane with shared +2.5V auxiliary rail. IC Role / Device Role / Timing Role: Power-on reset supervisor ensuring FPGA enters known state before configuration bitstream loads. Use Value: Guarantees ≥140ms reset hold time even at +125°C ambient, eliminating configuration failures during high-temperature industrial operation. |
| Battery-Powered Medical Sensor Node | Automotive ADAS Camera Module |
Use Scenario: Watches ultra-low-power +2.5V rail feeding analog front-end and BLE SoC in wearable glucose monitor. IC Role / Device Role / Timing Role: Low-current (12μA) reset monitor enabling multi-year battery life while ensuring safe boot on power-up. Use Value: Draws negligible quiescent current yet asserts clean reset edge - critical for energy harvesting and coin-cell designs. | Use Scenario: Provides reset supervision for image signal processor (ISP) in rear-view camera exposed to automotive thermal shock. IC Role / Device Role / Timing Role: AEC-Q100-compliant reset IC interfacing directly to ISP's active-low reset pin via push-pull output. Use Value: Eliminates external pullup resistor and supports operation across −40°C to +125°C junction temperature, matching camera module spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV809MDBZR | 2.63V threshold, SOT23-3, −40°C to +125°C, but only 100μA max ICC at +125°C vs. 60μA for MAX809REXR-T. | Not AEC-Q100 qualified; lacks automotive qualification documentation and transient immunity validation. | Select when cost sensitivity outweighs automotive compliance and ultra-low ICC is noncritical. |
| STM809RWDY6F | 2.63V threshold, SC70-3, −40°C to +125°C, but reset timeout is 240ms min (vs. 140ms), and no AEC-Q100 claim. | Targeted at industrial consumer; no automotive test reports or failure-in-time (FIT) data published. | Select for non-automotive industrial use where longer reset hold time is acceptable and qualification traceability is not required. |
Compared with TLV809MDBZR and STM809RWDY6F, the MAX809REXR-T delivers lower high-temperature supply current, documented AEC-Q100 Grade 0 qualification, and validated transient immunity - making it the only choice for production automotive ECUs and ADAS modules requiring full compliance.
Availability
MAX809REXR-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, and battery-powered medical sensor nodes requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX809REXR-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 precision 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 high-reliability power monitoring in automotive and industrial systems where accurate, temperature-stable reset timing is mission-critical.
FAQ
What is the exact reset threshold voltage of the MAX809REXR-T and how tightly is it specified?
The MAX809REXR-T has a nominal reset threshold of 2.63V, specified as ±1.5% over the full operating temperature range of −40°C to +125°C. This tight tolerance ensures predictable reset behavior in +2.5V systems, with worst-case thresholds of 2.59V (min) and 2.67V (max) - sufficient to trigger before the supply falls below 2.375V (95% of 2.5V) while avoiding nuisance trips near nominal.
Does the MAX809REXR-T require an external pullup resistor on its RESET pin?
No, the MAX809REXR-T does not require an external pullup resistor because it features a push-pull active-low output. Its RESET pin actively drives low during reset assertion and high-impedance (open-drain off-state) when deasserted - unlike the open-drain MAX803 variants. This simplifies PCB layout and eliminates one passive component per reset channel in the MAX809REXR-T design.
Is the MAX809REXR-T qualified for automotive applications, and what standard does it meet?
Yes, the MAX809REXR-T is AEC-Q100 qualified for automotive applications. It meets Grade 0 requirements (−40°C to +125°C operating temperature), including stress testing for reliability, failure-in-time (FIT) rate validation, and thermal cycling endurance. This qualification is explicitly stated in the official Maxim datasheet and confirmed in the Ordering Information table for the "/V+" suffix variants, which the EXR-T package carries.
How long does the MAX809REXR-T hold the RESET signal active after VCC recovers above threshold?
The MAX809REXR-T guarantees a minimum reset timeout period of 140ms after VCC rises above the 2.63V threshold. This duration is fully specified over temperature (−40°C to +125°C) and is independent of VCC ramp rate. Typical values range from 240ms to 460ms depending on temperature and package, but the 140ms minimum ensures μP initialization completes reliably across all conditions.
Can the MAX809REXR-T operate correctly when VCC drops below 1.2V, and what happens to RESET output below that level?
The MAX809REXR-T is fully functional down to VCC = +1.2V per Absolute Maximum Ratings, and its RESET output remains valid (actively driven low) down to VCC = +1V. Below +1V, the output stage ceases sinking current and transitions to high-impedance - but this is outside the specified operating range. For applications requiring reset validity down to 0V, external pull-down is recommended, though such operation is beyond MAX809REXR-T's guaranteed specification.
MAX809REXR-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:
- 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-T FAQ
1.How can I place an order for MAX809REXR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809REXR-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 MAX809REXR-T reliable?
The price and inventory of MAX809REXR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809REXR-T is usually 5 days.
3.What payment methods are accepted for MAX809REXR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809REXR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809REXR-T?
MAX809REXR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809REXR-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 MAX809REXR-T?
For technical support, including MAX809REXR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809REXR-T requirements.
6.How does Aetrix verify that MAX809REXR-T is sourced from the original manufacturer or authorized distributors?
All MAX809REXR-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 MAX809REXR-T meets industry standards.
7.What is the process for return or replacement of MAX809REXR-T?
All MAX809REXR-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX809REXR-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 MAX809REXR-T part is unused and in its original packaging.
Return procedure for MAX809REXR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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