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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 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,558
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Product details
Overview
MAX809REXR+T from Maxim Integrated is a precision 3-pin microprocessor supervisory circuit with push-pull active-low RESET output, designed to monitor +2.5V power supplies and assert reset when VCC falls below 2.63V (typical), holding reset for ≥140ms after VCC recovers. It operates from -40°C to +125°C in SC70-3 package and guarantees valid reset down to VCC = +1V - ideal for automotive-grade embedded controllers requiring high-temperature reliability.
For engineers reviewing the MAX809REXR+T datasheet, MAX809REXR+T pinout, MAX809REXR+T application, or MAX809REXR+T equivalent, this device delivers deterministic power-on reset timing, low 17µA supply current at +25°C, immunity to fast VCC transients, and AEC-Q100 qualification - critical for selecting robust reset supervision in safety-critical systems.
Technical Context
The MAX809REXR+T implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to detect VCC drops below its 2.63V threshold. Its internal timer ensures minimum 140ms reset pulse width after VCC recovery, independent of supply ramp rate.
It features a push-pull output stage 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. Reset assertion is guaranteed functional down to VCC = +1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (typical), ±2.5% over -40°C to +125°C - ensures reliable detection of +2.5V supply brownout before system instability |
| Reset Timeout | ≥140ms (min) after VCC rise - provides sufficient time for microprocessor core and peripherals to stabilize post-power-up |
| Supply Current | 17µA (typical at +25°C, VCC = 3V) - enables use in battery-powered automotive modules without compromising runtime |
| Operating Temperature | -40°C to +125°C - supports under-hood and engine-control unit (ECU) deployment per AEC-Q100 Grade 0 |
| Output Type | Push-pull active-low RESET - drives CMOS inputs directly without external components; compatible with bidirectional μP reset pins |
| VCC Validity Range | Reset asserted correctly down to VCC = +1V - maintains deterministic state during deep undervoltage conditions |
| Transient Immunity | Immune to ≤20µs negative VCC glitches of 100mV magnitude - prevents false resets from EMI or switching noise |
Pinout & Package
MAX809REXR+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 driver; must be connected to system ground plane for stable reset timing |
| 2 RESET | Active-low push-pull reset output | Drives low during VCC fault or power-up; sinks 1.2mA at 0.3V; asserts reset to μP until VCC remains above 2.63V for ≥140ms |
| 3 VCC | Supply input | Monitored +2.5V rail; powers internal circuitry; absolute max rating +6.0V; valid operation down to +1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.63V threshold | ±2.5% tolerance over full temperature range ensures consistent brownout detection across automotive thermal cycles |
| 140ms min reset timeout | Guaranteed minimum pulse width eliminates need for external RC timing networks in μP reset circuits |
| AEC-Q100 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor modules |
| 17µA supply current | Enables always-on reset supervision in low-power wake-up circuits without measurable battery drain |
| VCC = +1V reset validity | Maintains defined logic state even during severe undervoltage, preventing metastability in downstream logic |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Monitors +2.5V supply powering microcontroller and CAN transceiver in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low reset to prevent code execution during cold cranking or alternator load dump events. Use Value: Guarantees ≥140ms reset hold-off after VCC recovery - aligning precisely with MCU internal power-on reset requirements and avoiding boot failures. |
Use Scenario: Provides fail-safe reset to vision processor SoC in lane-departure warning or automatic emergency braking modules. IC Role / Device Role / Timing Role: Voltage supervisor ensuring deterministic reset initiation during rapid battery voltage sag caused by high-current actuator activation. Use Value: Immunity to 20µs/100mV VCC transients prevents spurious resets triggered by motor driver EMI, improving system functional safety compliance. |
| Automotive Body Control Module (BCM) | Telematics Control Unit (TCU) |
Use Scenario: Supervises +2.5V rail feeding door-lock MCU and LIN transceiver in centralized body electronics architecture. IC Role / Device Role / Timing Role: Precision reset generator maintaining valid reset signal down to VCC = +1V during vehicle battery discharge scenarios. Use Value: Eliminates need for external pull-down resistor on RESET line - reducing BOM count and PCB area in space-constrained BCM designs. |
Use Scenario: Ensures clean boot sequence for cellular modem and GNSS receiver in connected car telematics platforms. IC Role / Device Role / Timing Role: High-temperature-rated supervisory IC enabling continuous operation in dashboard-mounted TCU enclosures exposed to solar loading. Use Value: -40°C to +125°C operation with <30ppm/°C threshold drift preserves reset accuracy across extreme ambient conditions without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEXR+T | 2.93V reset threshold; otherwise identical SC70-3 packaging, timing, and AEC-Q100 qualification | Targets +3.0V or +3.3V supply monitoring instead of +2.5V systems | Select when supervising higher-voltage rails where 2.63V threshold would cause premature reset assertion |
| TLV809KDBZR | 2.63V threshold, SOT23-3 package, -40°C to +125°C, but not AEC-Q100 qualified; 1.8µA typical ICC | Lacks automotive qualification; lower supply current but unverified for under-hood vibration/thermal cycling | Consider only for non-automotive industrial or consumer applications where AEC-Q100 is not mandated |
Compared with MAX809REXR+T, MAX809SEXR+T shifts reset threshold upward for +3V systems while retaining identical automotive qualification and timing behavior; TLV809KDBZR offers ultra-low current but omits AEC-Q100 validation - making MAX809REXR+T the sole choice for production automotive reset supervision at 2.63V.
Availability
MAX809REXR+T is available at Aetrix Electronics and suitable for automotive engine control units, ADAS sensor modules, and body electronics requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
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, and communications markets, emphasizing high-reliability performance under harsh environmental conditions.
The MAX809 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for deterministic power-on reset generation in automotive and industrial control systems operating across extended temperature ranges.
FAQ
What is the exact reset threshold voltage of MAX809REXR+T and how does it vary with temperature?
The MAX809REXR+T has a nominal reset threshold of 2.63V at +25°C, with guaranteed range of 2.55V to 2.70V over -40°C to +85°C and 2.50V to 2.76V over -40°C to +125°C. Its temperature coefficient is tightly controlled at 30ppm/°C, meaning threshold drift is less than ±0.3% across the full automotive temperature range - critical for repeatable brownout detection in ECUs.
Does MAX809REXR+T require an external pullup resistor on the RESET pin?
No, MAX809REXR+T does not require an external pullup resistor because it features a push-pull output stage. The RESET pin actively drives high or low depending on VCC status, eliminating dependency on external components - unlike the open-drain MAX803 variant. This simplifies layout and improves noise immunity in high-density automotive PCBs.
Is MAX809REXR+T qualified for automotive applications and what standards does it meet?
Yes, MAX809REXR+T is AEC-Q100 qualified (Grade 0) and rated for operation from -40°C to +125°C. It meets automotive reliability requirements including HTOL, temperature cycling, and ESD testing per AEC-Q100 Rev H. The "/V+" suffix in related ordering codes explicitly denotes automotive qualification, and MAX809REXR+T shares the same qualification basis.
How long does the RESET signal remain asserted after VCC rises above the threshold?
The RESET signal of MAX809REXR+T remains asserted for a minimum of 140ms after VCC rises above the 2.63V threshold, with typical timeout of 240ms and maximum of 460ms over -40°C to +85°C (SC70 package). This guaranteed minimum ensures compatibility with all modern microcontrollers' internal power-on reset timing requirements without additional timing circuitry.
Can MAX809REXR+T operate reliably when VCC drops below 2.0V?
Yes, MAX809REXR+T guarantees correct RESET logic state down to VCC = +1.0V. Below this level, the output enters high-impedance state, but within the 1.0V–2.5V range, it continues to assert valid active-low reset - enabling robust supervision during slow battery discharge or cold-cranking scenarios common in automotive electrical systems.
MAX809REXR+T 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:
- 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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