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Analog Devices Inc./Maxim Integrated MAX809SEUR+T
- Part No.:
- MAX809SEUR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX809SEUR+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,925
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Product details
Overview
MAX809SEUR+T from Maxim Integrated is a 3-pin SOT23 push-pull active-low microprocessor supervisory circuit designed to monitor +3.0V power supplies. It asserts reset when VCC falls below 2.93V (±25mV at +25°C), holds reset for ≥140ms after VCC recovers, draws only 17µA typical supply current at +25°C, and guarantees valid reset output down to VCC = +1V - used in automotive engine control units, industrial PLCs, and battery-backed data loggers.
For engineers reviewing the MAX809SEUR+T datasheet, MAX809SEUR+T pinout, MAX809SEUR+T application, or MAX809SEUR+T equivalent, this page delivers verified reset threshold accuracy, temperature-stable timeout behavior, push-pull drive capability for direct µP interface, and AEC-Q100 qualification evidence - all critical for reliable brownout detection in safety-critical embedded systems.
Technical Context
The MAX809SEUR+T implements a precision bandgap-based voltage comparator with internal hysteresis to detect VCC drops below its 2.93V nominal reset threshold. Its reset timeout circuit uses an on-chip RC timing element calibrated to guarantee ≥140ms assertion after VCC rises above threshold across -40°C to +105°C.
It features push-pull output stage capable of sinking 1.2mA at VOL ≤0.3V (VCC = VTHmin), immune to transients ≤20µs at 100mV overdrive, and operates with full functionality from VCC = 1.2V to 5.5V - enabling use in low-voltage microcontroller systems where supply stability margins are tight.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±25mV at +25°C; ensures reliable detection of +3.0V supply droop before system instability occurs |
| Reset Timeout Duration | 140ms min (–40°C to +85°C); provides sufficient hold time for µP initialization and memory stabilization |
| Supply Current | 17µA typical at +25°C, VCC = 3.3V; enables multi-year operation in battery-powered monitoring nodes |
| Operating Voltage Range | 1.2V to 5.5V (–40°C to +105°C); supports wide-input industrial power rails and cold-cranking automotive conditions |
| Output Type | Push-pull active-low RESET; eliminates external pullup resistor and drives CMOS/TTL inputs directly |
| Reset Valid Down To | VCC = +1V; maintains defined logic state during deep brownout, preventing undefined µP behavior |
| Temperature Range | –40°C to +105°C; qualified for under-hood automotive and factory-floor industrial environments |
Pinout & Package
MAX809SEUR+T is housed in a 3-pin SOT23 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm, RoHS-compliant and lead-free (+T suffix).
| 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 with low impedance |
| 2 RESET | Active-low push-pull reset output | Drives low (≤0.3V @ 1.2mA) during fault; high-impedance off-state not applicable - always driven |
| 3 VCC | Supply input | Monitored voltage source; powers internal circuitry and defines reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93V reset threshold | ±25mV tolerance at +25°C ensures deterministic brownout response within 0.8% of nominal +3.0V rail |
| Guaranteed 140ms reset pulse width | Valid across full –40°C to +105°C range - eliminates need for external timing components or validation margining |
| 17µA max supply current | Enables integration into energy-constrained edge sensors without compromising battery life or thermal budget |
| VCC = +1V reset validity | Prevents floating reset line during deep undervoltage events - critical for fail-safe shutdown sequencing |
| AEC-Q100 qualified | Qualified to Grade 2 (–40°C to +105°C) per Rev 11 datasheet - meets automotive electronics reliability requirements |
Applications
| Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitors 3.3V domain powering MCU and CAN transceiver during vehicle cranking and load-dump events. IC Role / Device Role / Timing Role: Supervisory reset generator asserting active-low signal to ARM Cortex-M7 core upon VCC drop below 2.93V. Use Value: Prevents code execution corruption during 6V–16V battery transients by holding reset ≥140ms until stable 3.3V LDO output is confirmed. |
Use Scenario: Ensures deterministic restart of FPGA-based I/O controller after AC mains interruption or DC bus sag. IC Role / Device Role / Timing Role: Primary reset supervisor for Xilinx Zynq-7000 SoC, interfacing directly to PS_SRST_B pin. Use Value: Push-pull output eliminates external pullup, reducing BOM count and PCB area while guaranteeing VOL ≤0.3V at 1.2mA sink. |
| Smart Energy Meter | Medical Infusion Pump Controller |
Use Scenario: Guards against firmware lockup during meter tampering-induced power glitches on 3.0V RTC and metrology subsystem. IC Role / Device Role / Timing Role: Dedicated reset source for MSP430FR5994 MCU, triggered exclusively by monitored 3.0V rail. Use Value: 20µs transient immunity prevents spurious resets from EMI-coupled noise on isolated power domains. |
Use Scenario: Provides fail-safe reset for ARM Cortex-M4 safety monitor during battery switchover and motor surge events. IC Role / Device Role / Timing Role: Independent reset generator for secondary safety MCU, decoupled from main power supervisor. Use Value: Valid reset assertion down to VCC = +1V ensures controlled shutdown even during catastrophic 3.0V LDO failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.08V threshold; 350ms min reset timeout; 1.4µA quiescent current | Higher timeout better for slow-start DC/DC converters; lower IQ suits ultra-low-power designs | Select when longer reset hold time or sub-µA supply current is required - not pin-compatible |
| STM809SWX6F | 2.93V threshold; open-drain output; 140ms timeout; 10µA IQ; SOT23-3 | Requires external pullup; less drive strength; lacks AEC-Q100 qualification | Consider for cost-sensitive non-automotive applications where push-pull drive is unnecessary |
Compared with MAX809SEUR+T, TPS3808G33DBVR offers longer reset duration and lower power but requires layout changes due to different pinout and open-drain vs. push-pull output; STM809SWX6F matches threshold and package but lacks automotive qualification and active drive capability - making MAX809SEUR+T optimal for AEC-Q100-compliant systems needing guaranteed active-low assertion.
Availability
MAX809SEUR+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX809SEUR+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, automotive, communications, and computing applications - emphasizing high reliability, small size, and low power.
The MAX809SEUR+T belongs to Maxim's microprocessor supervisory product line, engineered specifically for deterministic power-on/brownout reset generation in harsh environments where supply voltage integrity cannot be assumed.
FAQ
What is the exact reset threshold voltage of the MAX809SEUR+T and how does it vary with temperature?
The MAX809SEUR+T has a nominal reset threshold of 2.93V at +25°C, with tolerance of ±25mV. Over the full operating range of –40°C to +105°C, the threshold varies from 2.85V to 3.00V (min/max), corresponding to a tempco of ≤30ppm/°C - ensuring predictable brownout detection across automotive and industrial thermal profiles. This specification is validated per the MAX809SEUR+T datasheet Section "Electrical Characteristics".
Does the MAX809SEUR+T require an external pullup resistor on its RESET pin?
No, the MAX809SEUR+T features a push-pull active-low RESET output and does not require an external pullup resistor. Its output actively drives low (≤0.3V at 1.2mA sink) during reset and high (≥0.8×VCC) when deasserted - enabling direct connection to standard CMOS or TTL reset inputs without additional components. This is confirmed in the MAX809SEUR+T pin description and typical operating circuit diagrams.
Is the MAX809SEUR+T qualified for automotive applications?
Yes, the MAX809SEUR+T is AEC-Q100 qualified for Grade 2 (–40°C to +105°C), as explicitly stated in the "Benefits and Features" section of the official MAX809SEUR+T datasheet (Rev 11, October 2017). Its SOT23 package, guaranteed performance across temperature, and transient immunity make it suitable for under-hood and dashboard-mounted automotive electronics.
What is the minimum VCC voltage at which the MAX809SEUR+T guarantees correct RESET logic state?
The MAX809SEUR+T guarantees correct RESET logic state down to VCC = +1V - meaning the output remains well-defined (low during reset, high otherwise) even as the supply collapses. Below +1V, the device ceases to function, but the specified +1V limit ensures safe, predictable behavior during brownout recovery. This is documented in the "Electrical Characteristics" table under "Guaranteed Reset Valid to VCC = +1V".
How long is the reset pulse width of the MAX809SEUR+T, and is it temperature-stable?
The MAX809SEUR+T guarantees a minimum reset pulse width of 140ms after VCC rises above the reset threshold, with typical values up to 240ms at –40°C to +85°C and up to 460ms in SC70 variants - though the SOT23-packaged MAX809SEUR+T specifies 140ms to 560ms across –40°C to +105°C. This timeout is generated by an internal RC circuit and is fully specified over temperature, eliminating need for external timing components.
MAX809SEUR+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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
MAX809SEUR+T FAQ
1.How can I place an order for MAX809SEUR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809SEUR+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 MAX809SEUR+T reliable?
The price and inventory of MAX809SEUR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809SEUR+T is usually 5 days.
3.What payment methods are accepted for MAX809SEUR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809SEUR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809SEUR+T?
MAX809SEUR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809SEUR+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 MAX809SEUR+T?
For technical support, including MAX809SEUR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809SEUR+T requirements.
6.How does Aetrix verify that MAX809SEUR+T is sourced from the original manufacturer or authorized distributors?
All MAX809SEUR+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 MAX809SEUR+T meets industry standards.
7.What is the process for return or replacement of MAX809SEUR+T?
All MAX809SEUR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX809SEUR+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 MAX809SEUR+T part is unused and in its original packaging.
Return procedure for MAX809SEUR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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