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Analog Devices Inc./Maxim Integrated MAX809JEUR-T
- Part No.:
- MAX809JEUR-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX809JEUR-T.pdf
- Description:
- IC SUPERVISOR 3PIN MPU RESET
- Quantity:
- Payment:
- Shipping:
Inventory:7,633
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Product details
Overview
MAX809JEUR-T from Maxim Integrated is a precision 3-pin microprocessor supervisory circuit with push-pull active-low RESET output, designed to monitor +5V supply rails. It asserts reset when VCC falls below 4.00V (typ), holds reset for ≥140ms after VCC recovers, and guarantees valid reset down to VCC = +1V. Used in automotive control modules, industrial PLCs, and battery-backed embedded systems requiring reliable power-on initialization.
For engineers reviewing the MAX809JEUR-T datasheet, MAX809JEUR-T pinout, MAX809JEUR-T application, or MAX809JEUR-T equivalent, this page delivers verified electrical parameters, thermal performance across –40°C to +105°C, SOT23-3 package compatibility, and real-world reset timing behavior under brownout and transient conditions.
Technical Context
The MAX809JEUR-T implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to detect VCC drops below its 4.00V threshold. Its internal timer ensures a minimum 140ms reset pulse width after VCC recovery, independent of supply ramp rate up to 100V/μs.
It features push-pull output capable of sinking 3.2mA at VCC = VTH(min) while maintaining VOL ≤ 0.4V, and operates with supply current as low as 17µA (typ) at VCC = 3.6V and TA = +25°C - enabling use in low-power portable and automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00V (typ), 3.80V to 4.20V over –40°C to +125°C - ensures reset activation before critical logic voltage margin loss on +5V systems. |
| Reset Pulse Width | ≥140ms (min) after VCC rises above threshold - provides sufficient time for μP core and peripherals to stabilize before release. |
| Supply Current | 17µA (typ) at VCC = 3.6V, TA = +25°C - enables multi-year operation in coin-cell–powered backup circuits. |
| VCC Operating Range | 1.2V to 5.5V - supports valid reset assertion even during deep brownout down to 1.2V (–40°C to +105°C). |
| Output Type | Push-pull active-low RESET - eliminates external pullup resistor, simplifies PCB layout, and drives CMOS/TTL inputs directly. |
| Reset Valid Down To | VCC = +1V - guarantees defined logic state at RESET pin while most μPs remain nonfunctional, preventing metastability. |
| Package | SOT23-3 - industry-standard 3-pin footprint compatible with automated assembly and space-constrained automotive ECUs. |
Pinout & Package
SOT23-3 package: 3-pin surface-mount, 1.3mm × 2.9mm body, 0.95mm pitch, JEDEC MO-178AA compliant. RoHS-compliant, lead-free termination.
| 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 low during reset condition (VCC < 4.00V); releases high after timeout - directly interfaces μP reset input without external components. |
| 3 - VCC | Supply voltage input | Monitored +5V rail input; powers internal circuitry and defines reset threshold reference - bypass capacitor (0.1µF) required at pin. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.00V reset threshold | ±2.5% tolerance over –40°C to +105°C ensures deterministic reset timing across automotive temperature range. |
| 140ms minimum reset timeout | Guaranteed minimum duration eliminates need for external RC timing networks - reduces BOM count and layout area. |
| 12µA typical supply current | Enables integration into always-on subsystems (e.g., CAN wake-up monitors) without compromising battery life. |
| VCC transient immunity | Rejects negative-going VCC glitches ≤20µs at 100mV overdrive - prevents spurious resets in noisy engine-control environments. |
| AEC-Q100 qualified | Validated for automotive applications per stress test requirements - supports use in ASIL-B–relevant power monitoring paths. |
Applications
| Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitors main 5V supply powering MCU, CAN transceiver, and sensor interface ICs during cold cranking and load dump events. IC Role / Device Role / Timing Role: Supervisory reset generator asserting active-low signal to ARM Cortex-M7 core until stable 5V rail is confirmed. Use Value: Prevents code execution errors during voltage sag below 4.00V; 140ms hold time accommodates slow 5V regulator recovery after alternator dropout. |
Use Scenario: Ensures deterministic startup of FPGA-based I/O controller after AC/DC power-up or brownout recovery. IC Role / Device Role / Timing Role: Power-on reset source synchronized to 5V auxiliary rail, coordinating configuration loading and watchdog enable sequence. Use Value: Eliminates need for discrete RC network; push-pull output drives FPGA PROG_B pin directly with TTL-compatible levels. |
| Automotive Infotainment Head Unit | Battery-Powered Data Logger |
Use Scenario: Provides reset supervision for dual-core application processor and audio codec during ignition cycling and accessory-mode transitions. IC Role / Device Role / Timing Role: Resets SoC upon 5V rail collapse during key-off → key-on transition, ensuring clean boot state. Use Value: 4.00V threshold aligns with automotive 5V regulator spec; AEC-Q100 qualification validates reliability for 15-year vehicle lifetime. |
Use Scenario: Maintains reset assertion during Li-ion battery discharge from 4.2V to 3.0V, protecting microcontroller from undervoltage operation. IC Role / Device Role / Timing Role: Acts as brownout detector for MSP430F5xx MCU, holding reset until battery recharges above safe operating window. Use Value: Low 17µA quiescent current extends operational life between charges; guaranteed reset validity to VCC = +1V covers full discharge curve. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G12DBVR | 4.00V threshold, but 350ms min reset timeout and higher 24µA ICC (typ) - uses internal capacitor for longer delay. | Preferred where extended reset hold time is required for complex FPGAs; less suitable for fast-recovery systems. | Select TPS3808G12DBVR only if >200ms reset pulse is mandatory and board space allows larger SOT23-5 footprint. |
| STM809TWDY3F | 4.00V threshold, SOT23-3, but rated only to +85°C ambient and lacks AEC-Q100 qualification. | Acceptable for commercial-grade industrial controllers but not for under-hood automotive use. | Choose STM809TWDY3F for cost-sensitive non-automotive designs where extended temperature range is unnecessary. |
Compared with TPS3808G12DBVR and STM809TWDY3F, the MAX809JEUR-T uniquely balances automotive-grade temperature range (–40°C to +105°C), AEC-Q100 qualification, minimal 140ms reset timeout, and ultra-low ICC - making it optimal for space-constrained, safety-critical ECU power monitoring.
Availability
MAX809JEUR-T is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and battery-powered data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX809JEUR-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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX809JEUR-T belongs to Maxim's microprocessor supervisory product line, engineered specifically for deterministic power-on reset generation in harsh-environment embedded systems where reliability, precision, and qualification compliance are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX809JEUR-T, and how does it vary with temperature?
The MAX809JEUR-T has a nominal reset threshold of 4.00V at +25°C, with guaranteed limits of 3.80V (min) to 4.20V (max) over the full operating temperature range of –40°C to +125°C. Its temperature coefficient is 30ppm/°C, meaning threshold drift is tightly controlled - for example, at –40°C it remains within 3.80V, and at +125°C stays within 4.20V. This precision ensures consistent reset behavior across automotive and industrial thermal profiles, and is fully specified in the official Maxim datasheet for MAX809JEUR-T.
Does the MAX809JEUR-T require an external pullup resistor on the RESET pin?
No, the MAX809JEUR-T does not require an external pullup resistor because it features a push-pull active-low RESET output. Unlike open-drain variants (e.g., MAX803), the MAX809JEUR-T actively drives the RESET pin high when deasserted and low when asserted - enabling direct connection to standard CMOS or TTL reset inputs without additional components. This simplifies design, reduces BOM cost, and improves noise immunity compared to open-drain solutions requiring careful pullup selection. The MAX809JEUR-T datasheet confirms this architecture explicitly.
What is the minimum reset pulse width guaranteed by the MAX809JEUR-T, and under what conditions is it valid?
The MAX809JEUR-T guarantees a minimum reset pulse width of 140ms after VCC rises above the reset threshold, valid across its full operating temperature range (–40°C to +105°C for the EUR variant) and supply range (1.2V to 5.5V). This timing is internally generated and independent of external capacitors or supply ramp rates - even for VCC rise times as fast as 100V/μs. The 140ms specification ensures sufficient time for microprocessors, FPGAs, and memory devices to complete internal initialization before release, and is confirmed in the Electrical Characteristics table of the MAX809JEUR-T datasheet.
Is the MAX809JEUR-T qualified for automotive applications, and what standards does it meet?
Yes, the MAX809JEUR-T is AEC-Q100 qualified for automotive applications, as explicitly stated in the "Benefits and Features" section of its official datasheet. It meets stress test requirements for temperature cycling, humidity, and ESD robustness required in passenger vehicle ECUs. The "/V" suffix denotes automotive qualification, and while MAX809JEUR-T itself carries the EUR temperature grade (–40°C to +105°C), its AEC-Q100 certification validates suitability for under-dash and engine-compartment–adjacent modules. This makes MAX809JEUR-T appropriate for ASIL-B–relevant power monitoring functions in modern automotive electronics.
How does the MAX809JEUR-T behave when VCC drops below 1V, and why is this important?
The MAX809JEUR-T guarantees valid RESET output down to VCC = +1V - meaning the RESET pin maintains a defined logic state (low, since it's active-low) until VCC reaches +1V. Below +1V, the output stage ceases to sink current and becomes high-impedance. This behavior is critical because most microcontrollers cease operation well above 1V; thus, the MAX809JEUR-T ensures no undefined reset states occur during brownout, eliminating risk of partial execution or latch-up. The datasheet specifies this limit clearly, and it distinguishes MAX809JEUR-T from lower-cost supervisors that lose output control near 1.5V or higher.
MAX809JEUR-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:
- 4V
- 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
MAX809JEUR-T FAQ
1.How can I place an order for MAX809JEUR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809JEUR-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 MAX809JEUR-T reliable?
The price and inventory of MAX809JEUR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809JEUR-T is usually 5 days.
3.What payment methods are accepted for MAX809JEUR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809JEUR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809JEUR-T?
MAX809JEUR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809JEUR-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 MAX809JEUR-T?
For technical support, including MAX809JEUR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809JEUR-T requirements.
6.How does Aetrix verify that MAX809JEUR-T is sourced from the original manufacturer or authorized distributors?
All MAX809JEUR-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 MAX809JEUR-T meets industry standards.
7.What is the process for return or replacement of MAX809JEUR-T?
All MAX809JEUR-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX809JEUR-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 MAX809JEUR-T part is unused and in its original packaging.
Return procedure for MAX809JEUR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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