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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 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,309
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Product details
Overview
MAX809TEXR+T from Maxim Integrated is a 3-pin SOT23-packaged microprocessor supervisory circuit with push-pull active-low RESET output, precision 3.08V reset threshold (±0.04V at +25°C), 140ms minimum reset timeout, 12μA supply current at +25°C, and guaranteed operation down to VCC = +1V - used to prevent code-execution errors during power-up, brownout, or power-down in embedded μP systems.
For engineers reviewing the MAX809TEXR+T datasheet, MAX809TEXR+T pinout, MAX809TEXR+T application, or MAX809TEXR+T equivalent, this page delivers verified electrical parameters, thermal performance across –40°C to +105°C, SOT23 package footprint details, and validated alternatives for industrial and automotive reset monitoring.
Technical Context
The MAX809TEXR+T implements a precision voltage comparator with 30ppm/°C tempco to monitor VCC against a factory-trimmed 3.08V threshold, asserting active-low RESET until VCC rises above threshold and remains stable for ≥140ms. Its push-pull output drives CMOS inputs directly without external pullup resistors.
Designed for +3.3V systems, it guarantees valid RESET assertion down to VCC = +1V and rejects fast transients (e.g., 20μs negative glitches ≤100mV below threshold). It operates over –40°C to +105°C in SOT23 package with 320mW max power dissipation at +70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±0.04V at +25°C; ensures reliable reset assertion before 3.3V supply drops below 3.0V nominal system margin |
| Reset Timeout | 140ms min after VCC rise; provides sufficient hold time for μP initialization and clock stabilization |
| Supply Current | 17μA typical at +25°C, VCC = 3.3V; enables use in battery-powered equipment with multi-year standby life |
| Operating Temperature | –40°C to +105°C; qualified for industrial and under-hood automotive environments |
| VCC Range | 1.2V to 5.5V; supports valid reset detection even during deep brownout conditions |
| Output Type | Push-pull active-low RESET; eliminates need for external pullup and ensures fast, rail-to-rail logic transitions |
| Reset Comparator Tempco | 30ppm/°C; maintains tight threshold stability across full temperature range without calibration |
Pinout & Package
MAX809TEXR+T uses a 3-pin SOT23 package (package code U3+1) with 1.3mm × 2.9mm footprint, 0.95mm height, and gull-wing leads compatible with standard reflow profiles (peak 260°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Return path for internal comparator and output stage; must be connected to system ground plane for noise immunity |
| 2 RESET | Active-low push-pull reset output | Drives μP RESET pin low during fault; sinks ≥1.2mA at 0.3V to ensure solid logic-0 under load |
| 3 VCC | Supply input | Monitored +3.3V rail; powers internal circuitry and defines reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08V threshold | Factory-trimmed to ±0.04V at +25°C and ±0.15V over –40°C to +105°C, enabling accurate brownout detection in 3.3V systems |
| 140ms minimum reset pulse width | Guaranteed timeout ensures μP completes power-on self-test and PLL lock before release |
| 12μA supply current | Enables >10-year battery life in coin-cell–powered IoT sensors and portable instrumentation |
| VCC = +1V reset validity | RESET remains asserted and electrically defined down to 1V supply, preventing metastability in failing power rails |
| Transient immunity | Rejects 20μs, 100mV VCC glitches - eliminates false resets from switching noise or ESD coupling |
Applications
| Industrial PLC Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Monitoring 3.3V microcontroller supply in programmable logic controllers exposed to wide ambient temperatures and EMI. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to halt μP execution until stable 3.3V rail is confirmed. Use Value: Prevents corrupted firmware execution during factory line voltage sags or field-level brownouts. | Use Scenario: Reset management for infotainment SoCs in vehicle door modules operating from 3.3V LDOs. IC Role / Device Role / Timing Role: Brownout detector with AEC-Q100 qualification ensuring safe shutdown during battery voltage dips. Use Value: Guarantees deterministic reset behavior across –40°C to +105°C without external components. |
| Portable Medical Sensors | Smart Energy Meters |
Use Scenario: Power supervision in handheld glucose monitors powered by single Li-ion cells with 3.3V buck-boost regulation. IC Role / Device Role / Timing Role: Low-current supervisor maintaining valid RESET down to 1V VCC during battery depletion. Use Value: Enables graceful shutdown before data loss or sensor calibration drift occurs. | Use Scenario: Reset coordination for metrology μC and communication ICs in DIN-rail energy meters with dual 3.3V supplies. IC Role / Device Role / Timing Role: Single-point reset generator synchronizing startup of isolated analog and digital subsystems. Use Value: Eliminates race conditions between ADC initialization and RF modem boot sequence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G30DBVR | 3.0V threshold (±0.5%), 200ms reset timeout, 1.2μA quiescent current, SOT23-5 package | Requires external capacitor for timeout adjustment; lower supply current but larger footprint | Select when ultra-low power (<2μA) is critical and board space allows 5-pin layout |
| STM809SWX6F | 3.08V threshold (±2.5%), 240ms reset timeout, 15μA supply current, SOT23-3 package | Higher threshold tolerance and longer timeout; not AEC-Q100 qualified | Select for cost-sensitive industrial designs where extended reset hold time improves robustness |
Compared with MAX809TEXR+T, TPS3808G30DBVR offers lower supply current but requires layout changes and lacks AEC-Q100 qualification, while STM809SWX6F matches the SOT23-3 footprint and threshold but trades tighter accuracy for higher production yield and lower unit cost.
Availability
MAX809TEXR+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and portable medical sensors requiring stable component supply with guaranteed long-term availability and traceable sourcing.
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 is a semiconductor company specializing in analog and mixed-signal ICs for power management, interface, sensing, and timing applications.
The MAX809 series belongs to Maxim's microprocessor supervisory product line, designed specifically for reliable, low-component-count reset generation in space-constrained, thermally demanding embedded systems.
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 tolerance of ±0.04V (±1.3%). Over the full operating range of –40°C to +105°C, the threshold varies by ±0.15V maximum, corresponding to a tempco of 30ppm/°C. This precision ensures consistent brownout detection in +3.3V systems without recalibration.
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. The internal driver actively pulls RESET low during fault conditions and drives it high when released, eliminating dependency on external components and simplifying PCB layout.
Is MAX809TEXR+T qualified for automotive applications?
Yes, MAX809TEXR+T is AEC-Q100 qualified for automotive applications. It meets stress test requirements for temperature cycling, humidity, and mechanical shock, and is rated for operation from –40°C to +105°C - making it suitable for body electronics, infotainment, and ADAS subsystems.
What is the minimum VCC voltage at which MAX809TEXR+T guarantees valid RESET assertion?
MAX809TEXR+T guarantees valid RESET assertion down to VCC = +1V. Below this voltage, the output remains logically defined and functional, ensuring μP reset integrity even during deep brownout events - a key reliability feature for fail-safe embedded systems.
How does MAX809TEXR+T handle fast voltage transients on the VCC supply line?
MAX809TEXR+T rejects fast negative-going VCC transients up to 20μs duration when the glitch magnitude is ≤100mV below the reset threshold. This transient immunity prevents spurious resets caused by switching noise or ESD coupling, and is enhanced by placing a 0.1μF bypass capacitor near the VCC pin.
MAX809TEXR+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:
- 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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