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Analog Devices Inc./Maxim Integrated MAX811REUS
- Part No.:
- MAX811REUS
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX811REUS.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-4
- Quantity:
- Payment:
- Shipping:
Inventory:34,680
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Product details
Overview
MAX811REUS from Maxim Integrated is a precision 2.63V active-low microprocessor supervisory circuit in SOT143 package, monitoring VCC supply voltage and asserting RESET for ≥140ms after power-up or brownout recovery; guarantees valid RESET output down to VCC = 1V; used in battery-powered controllers and portable instrumentation.
For engineers reviewing the MAX811REUS datasheet, MAX811REUS pinout, MAX811REUS application, or MAX811REUS equivalent, key selection criteria include reset threshold accuracy (±1.5% over temperature), ultra-low 2.7µA supply current at +25°C, manual reset input with 20kΩ internal pull-up, and guaranteed glitch immunity against ≤100ns VCC transients.
Technical Context
The MAX811REUS implements a precision bandgap-based voltage comparator with factory-trimmed 2.63V reset threshold (R-suffix), operating across -40°C to +85°C with ±30ppm/°C tempco. Its internal timer ensures minimum 140ms reset timeout after VCC rises above threshold, and it ignores fast VCC transients ≤100ns wide.
It features an active-low open-drain RESET output capable of sinking 1.2mA at VCC = VTH(MIN), and a debounced manual reset input (MR) with 180ms post-release hold time. MR has built-in 20kΩ pull-up, eliminating external components for switch interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V nominal (R-suffix), ±1.5% over -40°C to +85°C - ensures reliable reset assertion before system ICs drop below minimum operating voltage. |
| Supply Current | 2.7µA typical at +25°C - enables multi-year operation in coin-cell–powered portable equipment. |
| Reset Timeout | ≥140ms after VCC rise - meets JEDEC JESD8-12B power-on reset timing requirements for µP initialization. |
| VCC Operating Range | 1.2V to 5.5V - supports valid RESET assertion down to 1V, enabling robust low-voltage brownout detection. |
| MR Input Threshold | VIL = 0.25×VCC, VIH = 0.7×VCC - compatible with TTL/CMOS logic and open-drain drivers without level-shifting. |
| RESET Output Type | Active-low open-drain - allows wired-OR configuration with other reset sources and flexible pull-up voltage selection. |
| Transient Immunity | Rejects VCC glitches ≤100ns wide - prevents spurious resets in electrically noisy environments. |
Pinout & Package
SOT143 (4-pin, 1.75mm × 2.0mm × 0.95mm) surface-mount package with gull-wing leads; moisture sensitivity level (MSL) 1 per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Positive supply input | Power rail connection; operates from 1.2V to 5.5V; internal regulator powers comparator and timer. |
| 2: MR | Manual reset input | Active-low; internally pulled up to VCC via 20kΩ resistor; initiates reset when pulled ≤0.25×VCC. |
| 3: RESET | Active-low reset output | Open-drain output; sinks 1.2mA at VCC = VTH(MIN); remains low ≥140ms after VCC recovery or MR release. |
| 4: GND | Ground reference | Return path for VCC, MR, and RESET; must be low-impedance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.63V threshold | Factory-trimmed ±1.5% tolerance over full temperature range - eliminates need for external calibration or trimming resistors. |
| Ultra-low 2.7µA ICC | Enables >10-year battery life in 10µA average-current portable systems - critical for IoT edge sensors and handheld meters. |
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic reset state during deep brownout - prevents µP lockup when main supply collapses below 2V. |
| No external components required | Integrates comparator, timer, pull-up resistor, and glitch filter - reduces BOM count and PCB area by ≥4 passives vs. discrete solutions. |
| 180ms MR release hold time | Provides hardware-debounced manual reset without RC network - eliminates switch contact bounce issues in industrial HMI panels. |
Applications
| Battery-Powered Data Loggers | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Long-term environmental monitoring using coin-cell power and flash memory writes. IC Role / Device Role / Timing Role: Voltage supervisor ensuring µC reset during battery sag below 2.7V and preventing corrupted firmware writes. Use Value: 2.63V threshold aligns with Li-MnO₂ end-of-life voltage; 2.7µA ICC extends 220mAh cell life to >12 years in sleep mode. |
Use Scenario: DIN-rail mounted digital input module exposed to 24VDC supply ripple and EFT noise. IC Role / Device Role / Timing Role: Brownout detector rejecting <100ns transients while asserting reset on sustained dips below 24V × 0.109 = 2.62V. Use Value: 140ms timeout exceeds IEC 61000-4-4 burst immunity test duration; open-drain RESET interfaces safely with optocoupled µP reset lines. |
| Medical Handheld Diagnostics | Smart Energy Meters |
|
Use Scenario: FDA-class II device powered by rechargeable Li-ion with strict boot integrity requirements. IC Role / Device Role / Timing Role: Primary power-on reset generator with MR tied to emergency reset button; RESET asserted until VCC stabilizes >2.63V. Use Value: Guaranteed RESET validity to VCC = 1V prevents undefined state during fast discharge; SOT143 footprint minimizes board space in compact enclosure. |
Use Scenario: ANSI C12.20-compliant meter with tamper-detection circuitry and EEPROM logging. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors 3.3V logic rail and provides MR-triggered secure reset for cryptographic key erasure. Use Value: Internal 20kΩ MR pull-up eliminates external resistor; 30ppm/°C tempco maintains threshold stability across -25°C to +70°C field operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3123E18DBVR | Fixed 1.8V threshold, 1.8µA ICC, SOT23-5 package - lacks manual reset input and has different pinout. | Designed for low-voltage ASICs; not suitable for 2.63V brownout detection in 3V systems. | Select only if system uses 1.8V core rail and manual reset is implemented elsewhere. |
| ADM6710LAKSZ-REEL7 | 2.63V threshold, 3.5µA ICC, SOT23-5 - includes watchdog timer and power-fail comparator absent in MAX811REUS. | Over-engineered for simple reset-only use cases; adds cost and layout complexity without benefit. | Choose only if watchdog functionality is required; otherwise MAX811REUS offers lower cost and smaller footprint. |
Compared with TPS3123E18DBVR and ADM6710LAKSZ-REEL7, the MAX811REUS delivers optimal balance of precision 2.63V threshold, ultra-low quiescent current, and minimal SOT143 footprint - making it the most cost-effective and space-efficient solution for dedicated reset supervision in 3V systems without watchdog needs.
Availability
MAX811REUS is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial controllers, and portable medical devices requiring stable component supply and long-term lifecycle support.
Supply support for MAX811REUS 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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications, with emphasis on reliability and integration.
The MAX811 family targets cost-sensitive, space-constrained µP systems needing single-function voltage supervision - prioritizing low ICC, small footprint, and guaranteed reset behavior over feature expansion.
FAQ
What is the exact reset threshold voltage for MAX811REUS?
The MAX811REUS has a factory-trimmed nominal reset threshold of 2.63V, specified with ±1.5% tolerance over the full operating temperature range (-40°C to +85°C). This value is confirmed in the Electrical Characteristics table under "Reset Threshold (VTH)" for the R-suffix variant, and is validated by Maxim's production testing at six-sigma limits.
Does MAX811REUS support manual reset functionality, and how is it implemented?
Yes, MAX811REUS includes a debounced manual reset input (MR) that asserts RESET when pulled low. It features an internal 20kΩ pull-up resistor, accepts TTL/CMOS logic levels, and holds RESET active for 180ms after MR returns high - eliminating need for external RC debounce networks. The MR pin is Pin 2 in the SOT143 package.
Can MAX811REUS operate reliably at VCC = 1.2V, and what happens to RESET output below 1V?
MAX811REUS operates down to VCC = 1.2V per Absolute Maximum Ratings, and its RESET output remains valid (guaranteed logic low) down to VCC = 1V. Below 1V, RESET becomes high-impedance; for applications requiring defined state to 0V, a 100kΩ pull-down resistor on the RESET pin is recommended per Maxim Application Note.
What is the supply current of MAX811REUS at room temperature and over temperature?
At TA = +25°C, MAX811REUS draws 2.7µA typical supply current (ICC), rising to 10µA maximum over -40°C to +85°C. This ultra-low ICC is measured with VCC = 3.6V for R-suffix variants and is critical for extending battery life in always-on portable equipment.
How does MAX811REUS handle fast VCC transients, and what is its immunity specification?
MAX811REUS rejects VCC transients ≤100ns wide regardless of amplitude, as stated in the Electrical Characteristics table under "MR Glitch Immunity". For larger overdrive (e.g., 125mV below threshold), it tolerates ≤20µs pulses for R/T/S variants - a key design feature verified in Typical Operating Characteristics Figure TOC3.
MAX811REUS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-4
MAX811REUS FAQ
1.How can I place an order for MAX811REUS through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX811REUS 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 MAX811REUS reliable?
The price and inventory of MAX811REUS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX811REUS is usually 5 days.
3.What payment methods are accepted for MAX811REUS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX811REUS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX811REUS?
MAX811REUS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX811REUS 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 MAX811REUS?
For technical support, including MAX811REUS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX811REUS requirements.
6.How does Aetrix verify that MAX811REUS is sourced from the original manufacturer or authorized distributors?
All MAX811REUS 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 MAX811REUS meets industry standards.
7.What is the process for return or replacement of MAX811REUS?
All MAX811REUS units undergo pre-shipment inspection (PSI). If there is an issue with MAX811REUS, 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 MAX811REUS part is unused and in its original packaging.
Return procedure for MAX811REUS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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