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Analog Devices Inc./Maxim Integrated MAX811LEUS+T
- Part No.:
- MAX811LEUS+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX811LEUS+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:5,024
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Product details
Overview
MAX811LEUS+T from Maxim Integrated is a low-power microprocessor supervisory circuit that monitors 5V power supplies and asserts an active-low reset signal when VCC falls below 4.63V, with guaranteed RESET validity down to VCC = 1V and a minimum 140ms reset timeout period-used in portable equipment, controllers, and critical μP power monitoring.
For engineers reviewing the MAX811LEUS+T datasheet, MAX811LEUS+T pinout, MAX811LEUS+T application, or MAX811LEUS+T equivalent, this device delivers precision voltage supervision for 5V systems with manual reset input, transient immunity, and ultra-low 6µA supply current at +25°C.
Technical Context
The MAX811LEUS+T implements a precision bandgap-based voltage comparator with factory-trimmed 4.63V threshold (±0.04V over -40°C to +85°C) and internal 140ms reset timeout timer. Its reset assertion logic guarantees correct output state even as VCC drops to 1V, and it features built-in immunity to VCC transients ≤40µs at 125mV overdrive.
The device integrates a 20kΩ internal pull-up on the manual reset (MR) input, accepts TTL/CMOS-compatible logic levels, and requires no external components-enabling direct interface to microprocessors with bidirectional reset pins via optional 4.7kΩ series resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V nominal (4.50V to 4.75V over temperature); ensures reset before system ICs drop below 5V ±10% operating range. |
| Supply Current | 6µA typical at VCC = 5.5V; enables battery-powered operation with negligible quiescent load. |
| Reset Timeout | 140ms minimum after VCC rise above threshold; provides sufficient time for power stabilization and μP initialization. |
| RESET Output Type | Active-low open-drain compatible; sinks 3.2mA at VCC = VTH(MIN), ensuring robust drive into μP reset inputs. |
| VCC Operating Range | 1.2V to 5.5V over full temperature range; supports valid reset assertion during brownout recovery down to 1.2V. |
| MR Input Threshold | VIH = 2.3V, VIL = 0.8V (TTL-compatible); allows direct switch-to-GND or logic-level control without level-shifting. |
| Transient Immunity | Rejects VCC glitches ≤40µs wide at 125mV overdrive; prevents false resets in noisy power environments. |
Pinout & Package
MAX811LEUS+T is housed in a RoHS-compliant 4-pin SOT143 package (outline 21-0052, land pattern 90-0183), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and thermal pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and timers; must be low-impedance connection to system ground plane. |
| 2 | RESET | Active-low open-drain reset output; requires external pull-up to VCC or μP reset rail; sinks up to 3.2mA. |
| 3 | MR | Manual reset input; active-low, internally pulled up to VCC via 20kΩ; debounced internally-no external RC needed. |
| 4 | VCC | Primary supply input; powers internal circuitry and defines reset threshold reference; accepts 1.2V–5.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.63V threshold | Factory-trimmed to ±0.04V over -40°C to +85°C, eliminating need for external calibration or trimming resistors. |
| Guaranteed RESET down to VCC = 1V | Ensures deterministic reset state during deep brownout-critical for fail-safe shutdown in portable systems. |
| No external components required | Integrates voltage reference, comparator, timer, and MR pull-up-reduces BOM count and PCB area vs. discrete solutions. |
| 140ms min reset pulse width | Meets μP power-on reset timing requirements without external capacitor timing networks. |
| VCC transient rejection | Immune to negative-going glitches ≤40µs at 125mV overdrive-prevents spurious resets in switching power supply environments. |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: PLC I/O modules powered by 5V rails subject to intermittent brownouts during field deployment. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low reset to ARM Cortex-M4 microcontroller during undervoltage events. Use Value: Prevents corrupted firmware execution by holding reset until VCC stabilizes ≥4.63V for ≥140ms-ensuring deterministic boot sequence. |
Use Scenario: Battery-powered glucose meter with Li-ion supply decaying from 4.2V to 3.0V during discharge cycle. IC Role / Device Role / Timing Role: Monitors regulated 5V system rail derived from boost converter; triggers reset if input regulation fails. Use Value: 6µA supply current extends battery life; 4.63V threshold aligns with 5V ±5% supply spec, avoiding premature resets during normal decay. |
| Network Edge Routers | Test & Measurement Equipment |
Use Scenario: Fanless embedded router with multiple 5V LDOs powering CPU, PHY, and memory subsystems. IC Role / Device Role / Timing Role: Centralized reset supervisor coordinating power-up sequencing across independent voltage domains. Use Value: Manual reset input (MR) enables remote firmware recovery via GPIO-controlled switch-eliminating need for physical reset button. |
Use Scenario: Benchtop oscilloscope requiring guaranteed reset during AC line sags or hot-swap power module insertion. IC Role / Device Role / Timing Role: Brownout detector interfacing to FPGA configuration controller via open-drain RESET line. Use Value: 40µs transient immunity prevents false resets during relay-switching noise; 20kΩ MR pull-up simplifies front-panel switch integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G15DBVR | Fixed 4.63V threshold, 350ms reset timeout, 1.4µA supply current, SOT-23-5 package. | Longer reset pulse and lower ICC suit ultra-low-power IoT nodes; extra pin supports enable input. | Select when extended reset duration or enable-controlled activation is required; not pin-compatible due to 5-pin layout. |
| ADM809SARTZ-REEL7 | 4.63V threshold, 240ms reset timeout, 12µA ICC, SOT-23-3 package (no MR pin). | Lacks manual reset input; smaller footprint but no field-initiated reset capability. | Choose for space-constrained designs where MR is unnecessary; requires external circuitry for manual reset if needed. |
Compared with TPS3808G15DBVR and ADM809SARTZ-REEL7, the MAX811LEUS+T uniquely combines 4-pin SOT143 compactness, integrated MR input with internal pull-up, and guaranteed RESET validity down to VCC = 1V-making it optimal for cost-sensitive, manually serviceable 5V embedded systems.
Availability
MAX811LEUS+T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, network edge routers, and test & measurement equipment requiring stable component supply across long production lifecycles.
Supply support for MAX811LEUS+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 communications applications.
The MAX811/MAX812 family was engineered specifically for reliable, low-cost microprocessor supervision in space- and power-constrained systems-delivering factory-trimmed thresholds, integrated manual reset, and ultra-low ICC in minimal footprint.
FAQ
What is the reset threshold voltage of the MAX811LEUS+T?
The MAX811LEUS+T has a nominal reset threshold of 4.63V, specified from 4.50V to 4.75V over the full -40°C to +85°C operating temperature range. This threshold is factory-trimmed and optimized for 5V ±5% power supplies, ensuring reset assertion occurs before downstream ICs fall outside their 5V ±10% operating window. The 'L' suffix in MAX811LEUS+T explicitly denotes this 4.63V variant.
Does the MAX811LEUS+T provide manual reset functionality?
Yes, the MAX811LEUS+T includes a dedicated manual reset input (MR) on pin 3. It is active-low, features an internal 20kΩ pull-up resistor, and accepts TTL/CMOS logic levels. When MR is pulled low, RESET is asserted and remains active for at least 140ms after MR returns high-providing debounced, glitch-immune manual reset without external components.
What is the supply current consumption of the MAX811LEUS+T?
The MAX811LEUS+T draws only 6µA typical supply current at VCC = 5.5V and TA = +25°C, with a maximum of 15µA over temperature. This ultra-low ICC enables use in battery-powered applications such as portable medical devices and handheld test equipment where standby power budget is critical.
Can the MAX811LEUS+T operate reliably at low VCC voltages?
Yes-the MAX811LEUS+T guarantees correct RESET output behavior down to VCC = 1V. Below 1V, the RESET output becomes high-impedance, but within its specified 1.2V to 5.5V operating range, it maintains full functionality including accurate threshold detection, 140ms timeout, and MR response. This ensures fail-safe operation during brownout recovery.
What package type does the MAX811LEUS+T use?
The MAX811LEUS+T is supplied in a lead(Pb)-free 4-pin SOT143 package (package code U4+1, outline 21-0052). Its compact 2.9mm × 1.6mm footprint and gull-wing leads support automated assembly and high-density PCB layouts-ideal for space-constrained embedded systems where board area is at a premium.
MAX811LEUS+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- 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-143-4
MAX811LEUS+T FAQ
1.How can I place an order for MAX811LEUS+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX811LEUS+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 MAX811LEUS+T reliable?
The price and inventory of MAX811LEUS+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX811LEUS+T is usually 5 days.
3.What payment methods are accepted for MAX811LEUS+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX811LEUS+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX811LEUS+T?
MAX811LEUS+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX811LEUS+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 MAX811LEUS+T?
For technical support, including MAX811LEUS+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX811LEUS+T requirements.
6.How does Aetrix verify that MAX811LEUS+T is sourced from the original manufacturer or authorized distributors?
All MAX811LEUS+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 MAX811LEUS+T meets industry standards.
7.What is the process for return or replacement of MAX811LEUS+T?
All MAX811LEUS+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX811LEUS+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 MAX811LEUS+T part is unused and in its original packaging.
Return procedure for MAX811LEUS+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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