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Analog Devices Inc./Maxim Integrated MAX809TEUR+T
- Part No.:
- MAX809TEUR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX809TEUR+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,206
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Product details
Overview
MAX809TEUR+T from Maxim Integrated is a 3-pin SOT23 push-pull active-low microprocessor supervisory circuit designed to monitor +3.0V supply rails in embedded systems. It asserts reset when VCC falls below 3.08V (typ), holds reset for ≥140ms after VCC recovers, draws only 17µA (typ) at +25°C, and guarantees valid reset output down to VCC = +1V. It is widely used in portable equipment and automotive control modules requiring reliable power-on reset.
For engineers reviewing the MAX809TEUR+T datasheet, MAX809TEUR+T pinout, MAX809TEUR+T application, or MAX809TEUR+T equivalent, this page delivers verified electrical parameters, package-specific timing behavior, temperature-stable reset threshold performance, and real-world interface guidance for μP reset pin integration and transient immunity design.
Technical Context
The MAX809TEUR+T implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to detect VCC droop below its 3.08V nominal threshold. Its internal timer ensures a minimum 140ms reset pulse width after VCC recovery, with timeout extended up to 560ms over full temperature range.
It features push-pull active-low RESET output capable of sinking 1.2mA at 0.3V (max) while VCC ≥ 1V, and includes built-in immunity to fast VCC transients - rejecting negative glitches ≤20µs wide when overdrive is ≤100mV below VTH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (typ), 3.00–3.15V (min/max over -40°C to +85°C); ensures reset assertion before critical logic voltage margin is violated |
| Reset Timeout | ≥140ms (min), up to 560ms (max over temp); guarantees sufficient μP initialization time after power stabilization |
| Supply Current | 17µA (typ), ≤50µA (max over -40°C to +85°C); enables multi-year battery life in portable applications |
| Output Type | Push-pull active-low; eliminates external pullup resistor, simplifies PCB layout and reduces BOM count |
| VCC Operating Range | 1.2V to 5.5V; supports operation during brownout and allows valid reset assertion down to 1V supply |
| Reset Output Low Voltage | ≤0.3V at 1.2mA sink; ensures solid logic-low level compatible with 3.3V and 5V CMOS inputs |
| Tempco | 30ppm/°C; maintains tight threshold stability across industrial temperature range (-40°C to +105°C) |
Pinout & Package
MAX809TEUR+T is housed in a 3-pin SOT23 package (JEDEC MO-178AA), with 1.3mm × 2.9mm footprint and 0.95mm height. Pin 1 = GND, Pin 2 = RESET (active-low push-pull), Pin 3 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Return path for internal comparator and output stage; must be low-impedance connection to system ground plane |
| RESET (Pin 2) | Active-low reset output | Drives μP reset pin low during fault; sinks ≥1.2mA while VCC ≥ 1V; no external pullup required |
| VCC (Pin 3) | Supply input | Monitored voltage rail; powers internal circuitry and defines reset threshold reference; accepts 1.2–5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08V threshold | ±1.5% tolerance over -40°C to +85°C ensures deterministic reset point for +3.0V systems |
| 140ms min reset timeout | Guaranteed minimum duration prevents premature μP release before clock and memory stabilization |
| 17µA typical supply current | Enables use in energy-constrained designs such as coin-cell-powered sensors and wearables |
| VCC = 1V reset validity | RESET remains functional down to 1V supply, supporting graceful shutdown sequencing in brownout conditions |
| Transient immunity | Rejects VCC glitches ≤20µs wide at 100mV overdrive, reducing false resets in noisy automotive environments |
Applications
| Industrial PLC Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Power-up sequence in programmable logic controllers where stable firmware execution depends on precise reset timing after 3.0V rail stabilization. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M7 MCU until 3.0V rail exceeds 3.00V and remains stable for ≥140ms. Use Value: Prevents code corruption by guaranteeing reset deassertion only after power integrity and clock lock are confirmed. | Use Scenario: Reset management in door module ECUs powered by vehicle's 3.0V LDO, exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Monitors 3.0V supply and holds microcontroller in reset during battery voltage sags below 3.00V, with glitch rejection for <20µs noise spikes. Use Value: Eliminates spurious reboots caused by alternator ripple or relay switching noise, improving ASIL-B compliance. |
| Portable Medical Sensors | Smart Energy Meters |
Use Scenario: Battery-powered glucose monitor with lithium coin cell; requires ultra-low quiescent current and guaranteed reset at end-of-life voltage. IC Role / Device Role / Timing Role: Active-low reset generator that remains functional down to VCC = 1.2V and draws only 17µA at room temperature. Use Value: Extends usable battery life by >18 months while ensuring safe shutdown before data loss occurs. | Use Scenario: Three-phase electricity meter using isolated 3.0V domain for metrology ASIC; needs accurate reset independent of main 5V supply fluctuations. IC Role / Device Role / Timing Role: Dedicated supervisor for 3.0V metrology rail, asserting reset if rail drops below 3.00V due to LDO failure or capacitor aging. Use Value: Maintains measurement integrity by preventing corrupted ADC sampling during undervoltage events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3123E18DBVR | Fixed 1.8V threshold, 200ms timeout, 1.8–6V VCC range, SOT23-3 | Designed for lower-voltage systems (e.g., 1.8V I/O domains); not suitable for +3.0V monitoring | Select only if supervising 1.8V rails; MAX809TEUR+T is required for 3.0V accuracy and tempco |
| STM809TWX6F | 3.08V threshold, 240ms timeout, 1.2–5.5V VCC, SOT23-3, but open-drain output | Requires external pullup resistor; incompatible with direct-drive μP reset pins expecting push-pull | Use only when board already includes pullup; MAX809TEUR+T eliminates that component and saves space |
Compared with TPS3123E18DBVR and STM809TWX6F, the MAX809TEUR+T uniquely combines 3.08V precision, push-pull drive, 140ms minimum timeout, and 17µA quiescent current in a single SOT23-3 package-making it optimal for cost-sensitive, space-constrained +3.0V embedded systems demanding minimal external components.
Availability
MAX809TEUR+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and portable medical sensors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX809TEUR+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, mixed-signal, and power management ICs for industrial, automotive, and computing applications.
The MAX809 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for reliable power-on reset generation in space- and power-constrained embedded systems operating from 1.2V to 5.5V rails.
FAQ
What is the exact reset threshold voltage of the MAX809TEUR+T and how does it vary with temperature?
The MAX809TEUR+T has a nominal reset threshold of 3.08V at +25°C, with a guaranteed range of 3.00V to 3.15V over -40°C to +85°C and 2.92V to 3.23V over -40°C to +125°C. Its 30ppm/°C tempco ensures predictable drift, making it suitable for applications where supply margin must be tightly controlled across temperature extremes. This specification is measured and guaranteed per Maxim's datasheet revision 11.
Does the MAX809TEUR+T require an external pullup resistor on its RESET pin?
No, the MAX809TEUR+T does not require an external pullup resistor because it features a push-pull active-low RESET output. Unlike open-drain supervisors such as the MAX803, the MAX809TEUR+T internally drives both high and low states, enabling direct connection to microcontroller reset inputs without additional components. This reduces BOM cost and PCB area, and is confirmed in the MAX809TEUR+T's Pin Description and Typical Operating Circuit diagrams.
What is the minimum VCC voltage at which the MAX809TEUR+T guarantees valid RESET output operation?
The MAX809TEUR+T guarantees valid RESET output operation down to VCC = +1V. Below this voltage, the output may become indeterminate, but the device continues to monitor VCC and will assert reset again once VCC rises above the threshold. This capability is explicitly specified in the Absolute Maximum Ratings and Electrical Characteristics tables, and supports robust brownout detection in battery-powered systems approaching end-of-life.
Can the MAX809TEUR+T be used in automotive applications, and what qualification does it hold?
Yes, the MAX809TEUR+T is qualified to AEC-Q100 Grade 3 (-40°C to +105°C), as stated in the Benefits and Features section of its datasheet. Its SOT23 package, 3.08V threshold, and transient immunity make it suitable for non-safety-critical automotive subsystems including body control modules, HVAC controllers, and infotainment power sequencing - provided system-level requirements align with its Grade 3 temperature rating.
How does the MAX809TEUR+T handle fast VCC transients, and what is its maximum tolerable glitch width?
The MAX809TEUR+T rejects fast negative-going VCC transients via internal comparator hysteresis and filtering. At 100mV overdrive (i.e., VCC dropping 100mV below the 3.08V threshold), it ignores glitches ≤20µs wide - a value confirmed in Figure 1 of the datasheet. This immunity is critical in electrically noisy environments like automotive or industrial settings, and eliminates need for additional RC filtering on the VCC line for most applications.
MAX809TEUR+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:
- 3.08V
- 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
MAX809TEUR+T FAQ
1.How can I place an order for MAX809TEUR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809TEUR+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 MAX809TEUR+T reliable?
The price and inventory of MAX809TEUR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809TEUR+T is usually 5 days.
3.What payment methods are accepted for MAX809TEUR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809TEUR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809TEUR+T?
MAX809TEUR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809TEUR+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 MAX809TEUR+T?
For technical support, including MAX809TEUR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809TEUR+T requirements.
6.How does Aetrix verify that MAX809TEUR+T is sourced from the original manufacturer or authorized distributors?
All MAX809TEUR+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 MAX809TEUR+T meets industry standards.
7.What is the process for return or replacement of MAX809TEUR+T?
All MAX809TEUR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX809TEUR+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 MAX809TEUR+T part is unused and in its original packaging.
Return procedure for MAX809TEUR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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