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Analog Devices Inc./Maxim Integrated MAX809MEUR-T
- Part No.:
- MAX809MEUR-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX809MEUR-T.pdf
- Description:
- IC SUPERVISOR 3PIN MPU RESET
- Quantity:
- Payment:
- Shipping:
Inventory:26,924
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Product details
Overview
MAX809MEUR-T from Maxim Integrated is a 3-pin SOT23-packaged microprocessor supervisory circuit with push-pull active-low RESET output, 4.38V reset threshold (±2.5% over temperature), 140ms minimum reset timeout, 12μA supply current at +25°C, and guaranteed operation down to VCC = +1V. It monitors +3.3V/+5V digital power rails in embedded controllers and portable instrumentation.
For engineers reviewing the MAX809MEUR-T datasheet, MAX809MEUR-T pinout, MAX809MEUR-T application, or MAX809MEUR-T equivalent, this page delivers verified electrical specs, thermal performance across –40°C to +105°C, SOT23 footprint compatibility, and precise reset timing behavior under brownout and power-up conditions.
Technical Context
The MAX809MEUR-T implements a precision bandgap-based voltage comparator with hysteresis-free threshold detection and internal timer logic to generate a minimum 140ms reset pulse after VCC rises above 4.38V. Its push-pull output drives CMOS/TTL loads directly without external pullup components.
Designed for single-supply monitoring, it ignores fast VCC transients ≤20μs (at 100mV overdrive) and maintains valid RESET state down to VCC = +1V-enabling reliable reset assertion during deep brownout recovery in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±2.5% over –40°C to +105°C - ensures reset asserts before system logic fails on +5V or +3.3V rails |
| Reset Timeout | 140ms min - guarantees μP initialization completes before code execution begins |
| Supply Current | 12μA typ at +25°C - enables multi-year battery life in portable equipment |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep undervoltage recovery |
| Output Type | Push-pull active-low - eliminates need for external pullup resistor; sinks 1.2mA at 0.3V |
| Temp Range | –40°C to +105°C - qualified for industrial and automotive-adjacent environments |
| Package | SOT23-3 - industry-standard 2.92mm × 1.3mm footprint compatible with high-density PCB layouts |
Pinout & Package
SOT23-3 package: 2.92mm × 1.3mm × 1.02mm body, gull-wing leads, RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Return path for internal comparator and output stage; must connect to system ground plane |
| 2 RESET | Active-low push-pull output | Drives low (≤0.3V @ 1.2mA) during reset; high (≥0.8×VCC) otherwise; interfaces directly to μP reset pin |
| 3 VCC | Supply input | Monitored power rail input; powers internal circuitry and defines reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.38V threshold | ±2.5% tolerance over full temperature range ensures deterministic reset point across operating conditions |
| 140ms minimum reset pulse | Guaranteed minimum duration prevents premature release of μP reset even during slow VCC ramp-up |
| 12μA quiescent current | Enables >10-year battery life in always-on monitoring applications with coin-cell power |
| VCC = +1V reset validity | RESET remains asserted down to 1V supply-critical for brownout recovery in low-power systems |
| Transient immunity | Rejects VCC glitches ≤20μs wide at 100mV overdrive-reduces false resets in noisy power environments |
Applications
| Industrial Controller Monitoring | Portable Medical Instrumentation |
|---|---|
Use Scenario: Real-time PLC I/O module powered from +3.3V rail with intermittent brownouts due to shared industrial bus coupling. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to ARM Cortex-M4 until +3.3V stabilizes above 4.38V for ≥140ms. Use Value: Prevents corrupted register writes and firmware lockup during transient dips-ensures deterministic boot sequence after line disturbance. | Use Scenario: Handheld glucose meter using CR2032 battery; VCC decays from 3.3V to 1.8V during end-of-life discharge. IC Role / Device Role / Timing Role: Reset generator holding microcontroller in reset while VCC falls below 4.38V and for 140ms after recovery. Use Value: Guarantees safe shutdown and data retention before supply drops below 1.2V operational limit-avoids memory corruption. |
| Automotive Body Control Module | Smart Energy Metering Hardware |
Use Scenario: 12V-to-3.3V converted supply powering CAN controller and EEPROM in door module; experiences cold-crank dips to 2.8V. IC Role / Device Role / Timing Role: Voltage supervisor triggering reset when converted 3.3V rail falls below 4.38V threshold (monitors pre-regulator input). Use Value: Enables fail-safe reinitialization of CAN transceiver and flash memory controller before communication resumes-meets ISO 16750-2 pulse 4 immunity. | Use Scenario: Three-phase electricity meter with isolated +5V auxiliary supply; subject to lightning-induced surges causing brief VCC collapse. IC Role / Device Role / Timing Role: Reset circuit asserting active-low signal to MSP430F676x during sub-100ms dips below 4.38V on +5V rail. Use Value: Eliminates need for external RC network-provides repeatable 140ms reset hold time independent of capacitor aging or temperature drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G12DBVR | 4.25V threshold, 200ms reset timeout, 1.2μA IQ, SOT23-5 package | Requires external capacitor for timeout adjustment; lower IQ but larger footprint | Select when ultra-low power (<2μA) and adjustable timeout are prioritized over fixed 140ms and 3-pin simplicity |
| STM809MTR | 4.39V threshold, 240ms reset timeout, 15μA IQ, SOT23-3 package | Longer timeout may delay system startup; same pinout but different timing behavior | Choose when longer reset hold time improves reliability in systems with slow clock stabilization |
Compared with TPS3808G12DBVR and STM809MTR, the MAX809MEUR-T delivers tighter threshold accuracy (±2.5% vs ±3.5%), fixed 140ms timing without external components, and identical SOT23-3 footprint-making it optimal for space-constrained, cost-sensitive industrial designs requiring deterministic reset behavior.
Availability
MAX809MEUR-T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, and smart energy meters requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for MAX809MEUR-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 industrial, communications, and computing applications.
The MAX809 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for deterministic power-on reset generation in resource-constrained embedded systems with strict timing and footprint requirements.
FAQ
What is the exact reset threshold voltage of MAX809MEUR-T and how does it vary with temperature?
The MAX809MEUR-T has a nominal reset threshold of 4.38V at +25°C, with guaranteed limits of 4.25V (min) to 4.50V (max) over –40°C to +85°C, and 4.16V to 4.56V over –40°C to +125°C. Its tempco is 30ppm/°C, resulting in <0.3% total drift across its rated –40°C to +105°C operating range. This precision ensures consistent reset behavior across environmental conditions without calibration.
Does MAX809MEUR-T require an external pullup resistor on the RESET pin?
No, the MAX809MEUR-T features a push-pull active-low RESET output and does not require an external pullup resistor. Its output actively drives high (VOH ≥ 0.8×VCC) and low (VOL ≤ 0.3V at 1.2mA sink), enabling direct connection to standard CMOS/TTL reset inputs. This eliminates BOM cost and layout area versus open-drain alternatives like the MAX803 series.
What is the minimum VCC voltage at which MAX809MEUR-T guarantees valid RESET output state?
The MAX809MEUR-T guarantees correct RESET logic state (low during reset, high otherwise) for VCC down to +1.0V. Below 1.0V, the output enters high-impedance state. This feature allows reliable reset assertion during deep brownout events common in battery-powered systems, ensuring microcontrollers remain held in reset until supply recovers sufficiently for stable operation.
How does MAX809MEUR-T handle fast power supply transients?
The MAX809MEUR-T incorporates comparator hysteresis and internal filtering to reject VCC transients ≤20μs wide when the overdrive (VTH – VCC) is 100mV. For example, a 100mV dip below 4.38V lasting ≤20μs will not trigger a false reset. This immunity is validated per typical operating characteristics graphs in the datasheet and enables robust operation in electrically noisy environments such as motor control or switching power supply proximity.
Is MAX809MEUR-T pin-compatible with other members of the MAX809 family?
Yes, all MAX809 variants-including MAX809LEUR-T, MAX809JEUR-T, and MAX809TEUR-T-share identical SOT23-3 pinout (GND, RESET, VCC) and push-pull active-low output architecture. Only the reset threshold voltage differs between suffixes (e.g., J = 4.00V, M = 4.38V, L = 4.63V). This allows drop-in replacement across voltage variants without PCB redesign, provided the target supply rail matches the selected threshold.
MAX809MEUR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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 ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX809MEUR-T FAQ
1.How can I place an order for MAX809MEUR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809MEUR-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 MAX809MEUR-T reliable?
The price and inventory of MAX809MEUR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809MEUR-T is usually 5 days.
3.What payment methods are accepted for MAX809MEUR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809MEUR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809MEUR-T?
MAX809MEUR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809MEUR-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 MAX809MEUR-T?
For technical support, including MAX809MEUR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809MEUR-T requirements.
6.How does Aetrix verify that MAX809MEUR-T is sourced from the original manufacturer or authorized distributors?
All MAX809MEUR-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 MAX809MEUR-T meets industry standards.
7.What is the process for return or replacement of MAX809MEUR-T?
All MAX809MEUR-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX809MEUR-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 MAX809MEUR-T part is unused and in its original packaging.
Return procedure for MAX809MEUR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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