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Analog Devices Inc./Maxim Integrated MAX811MEUS
- Part No.:
- MAX811MEUS
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX811MEUS.pdf
- Description:
- IC SUPERVISOR UPROCESSR VOLT MON
- Quantity:
- Payment:
- Shipping:
Inventory:1,897
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Product details
Overview
MAX811MEUS from Maxim Integrated is an active-low microprocessor supervisory circuit in a 4-pin SOT143 package, designed to monitor 4.38V power supplies and assert reset for ≥140ms after VCC rises above threshold. It features 6µA supply current, guaranteed RESET validity down to VCC = 1V, and includes a debounced manual reset input (MR) with internal 20kΩ pull-up. Used in portable battery-powered controllers and critical µP power monitoring.
For engineers reviewing the MAX811MEUS datasheet, MAX811MEUS pinout, MAX811MEUS application, or MAX811MEUS equivalent, this page delivers verified reset threshold (4.38V), temperature-stable timing (±30ppm/°C), MR glitch immunity (100ns), and SOT143 package compatibility - all essential for reliable power-on reset design in embedded systems.
Technical Context
The MAX811MEUS implements a precision voltage comparator with hysteresis-free threshold detection and an internal timeout timer that guarantees minimum 140ms reset assertion after VCC recovery. Its reset logic is fully static - no external capacitor required - and the comparator ignores transients ≤100ns at 125mV overdrive.
It integrates a debounced manual reset input (MR) with 180ms post-release hold time and internal 20kΩ pull-up, enabling direct switch connection without external components. The active-low RESET output remains valid down to VCC = 1V, ensuring deterministic state during brownout recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V nominal; ensures reset asserts before 5V ±5% supply falls below system IC minimum operating voltage |
| Supply Current | 6µA typical; enables multi-year operation in coin-cell–powered portable instruments |
| Reset Timeout | ≥140ms after VCC > threshold; meets Intel-compatible power-on reset timing requirements |
| MR Minimum Pulse Width | 10µs; rejects contact bounce and EMI-induced glitches on manual reset line |
| Reset Threshold Tempco | ±30ppm/°C; maintains <0.5% threshold drift across –40°C to +85°C industrial range |
| VCC Operating Range | 1.2V to 5.5V; supports valid reset assertion during deep brownout down to 1V |
| RESET Output Type | Active-low open-drain; sinks 3.2mA at VCC = VTH(MAX), compatible with TTL/CMOS inputs |
Pinout & Package
MAX811MEUS is housed in a 4-pin SOT143 package (4.0 × 2.0 × 1.75 mm), surface-mount, lead-free compatible, with gull-wing leads and JEDEC-standard footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Positive supply input | Monitored voltage rail; powers internal comparator and timer; valid from 1.2V to 5.5V |
| MR | Manual reset input | Active-low; internally pulled up to VCC via 20kΩ; initiates reset when pulled ≤0.25×VCC |
| RESET | Active-low reset output | Open-drain output; guaranteed low for VCC ≥1V; requires external pull-up for µP interface |
| GND | Ground reference | Return path for VCC, MR, and RESET; must be low-impedance for accurate threshold sensing |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated comparator, timer, and pull-up eliminate capacitors, resistors, and discrete logic in reset circuitry |
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic reset state during deep brownout - critical for nonvolatile memory write protection |
| 100ns MR glitch immunity | Rejects EMI and switch bounce without external RC filtering, reducing BOM count and board area |
| 4.38V precision threshold | Matches 5V ±5% supply tolerance; triggers reset before downstream logic enters undefined operating region |
| 6µA quiescent current | Enables always-on supervision in battery-backed systems with <1% annual self-discharge impact |
Applications
| Industrial Controllers | Portable Medical Instruments |
|---|---|
Use Scenario: PLC I/O modules powered by 5V DC-DC converters subject to load transients and thermal cycling. IC Role / Device Role / Timing Role: Supervises VCC and asserts active-low reset to ARM Cortex-M4 microcontroller during brownout events. Use Value: Prevents firmware corruption by guaranteeing ≥140ms reset hold time after supply recovery, meeting IEC 61000-4-11 immunity requirements. |
Use Scenario: Handheld glucose meters using CR2032 coin cell with aging voltage droop under pulse-load conditions. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output and forces reset when battery drops below 3.0V threshold (via MAX811TEUS variant); MAX811MEUS used for 5V auxiliary rails. Use Value: 6µA supply current extends battery life beyond 2 years; 4.38V threshold ensures reset occurs before ADC reference instability affects measurement accuracy. |
| Smart Energy Meters | Automotive Body Control Modules |
Use Scenario: DIN-rail mounted electricity meters with isolated 5V auxiliary supply derived from mains. IC Role / Device Role / Timing Role: Provides power-on reset and brownout detection for TI MSP430F6769 metrology MCU. Use Value: ±30ppm/°C tempco maintains reset threshold accuracy across –25°C to +70°C enclosure temperatures, preventing false resets during seasonal ambient shifts. |
Use Scenario: 12V-to-5V converted subsystems in door module ECUs exposed to load-dump transients. IC Role / Device Role / Timing Role: Supervises 5V microcontroller rail; MR input tied to diagnostic test port for field service reset initiation. Use Value: Internal 20kΩ MR pull-up eliminates external resistor; 10µs MR pulse width tolerance allows use of low-cost tactile switches without debounce hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G15DBVR | Active-low reset, 1.5V threshold, 350ms timeout, 1.4µA ICC, SOT-23-5 package | Designed for ultra-low-power 1.8V/3.3V systems; lacks MR input; higher accuracy (0.5% vs. ±2.5%) | Select when lower supply current and tighter threshold tolerance are prioritized over manual reset capability and 4.38V nominal threshold. |
| ADM6806-4ARTZ-R7 | Active-low reset, 4.38V threshold, 240ms timeout, 12µA ICC, SOT-23-4 package | Same threshold but longer timeout; higher quiescent current; no MR input; RoHS-compliant only | Select when extended reset duration is required and MR functionality is unnecessary; verify SOT-23-4 footprint compatibility with existing layout. |
Compared with TPS3808G15DBVR and ADM6806-4ARTZ-R7, the MAX811MEUS uniquely combines 4.38V precision threshold, integrated MR input with internal pull-up, and 140ms industry-standard timeout in a 4-pin SOT143 - making it optimal for cost-sensitive, space-constrained 5V controller designs requiring field-serviceable reset.
Availability
MAX811MEUS is available at Aetrix Electronics and suitable for industrial controllers, portable medical instruments, and smart energy meters requiring stable component supply throughout product lifecycles.
Supply support for MAX811MEUS 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 MAX811/MAX812 family was designed specifically for cost-effective, low-power microprocessor supervision in space-constrained embedded systems - delivering precision voltage monitoring, manual reset, and guaranteed reset timing without external components.
FAQ
What is the exact reset threshold voltage for MAX811MEUS?
The MAX811MEUS has a nominal reset threshold voltage of 4.38V, with guaranteed limits of 4.30V (min) and 4.46V (max) over the full –40°C to +85°C temperature range. This value is laser-trimmed at wafer test and specified per the Electrical Characteristics table in the MAX811/MAX812 datasheet Rev 4. The 'M' suffix explicitly denotes the 4.38V variant.
Does MAX811MEUS require an external pull-up resistor on the RESET pin?
Yes, MAX811MEUS features an open-drain active-low RESET output and requires an external pull-up resistor to VCC (typically 10kΩ to 100kΩ) to interface with standard CMOS or TTL microcontroller reset inputs. The internal circuitry does not provide pull-up; omission will result in floating RESET state and unreliable system initialization.
Can MAX811MEUS operate with VCC below 2.0V?
Yes, MAX811MEUS operates with VCC as low as 1.2V and guarantees valid active-low RESET output down to VCC = 1V. Below 1V, the RESET output becomes high-impedance; for applications requiring asserted reset down to 0V, a 100kΩ external pull-down resistor on the RESET pin is recommended per Maxim Application Note 4112.
What is the function of the MR pin on MAX811MEUS?
The MR (Manual Reset) pin on MAX811MEUS is an active-low input with internal 20kΩ pull-up to VCC. Driving MR low asserts RESET immediately, and RESET remains low for 180ms after MR returns high. It accepts TTL/CMOS logic levels and supports direct connection to a momentary switch to ground - no external debounce components needed.
Is MAX811MEUS pin-compatible with other MAX811 variants like MAX811TEUS?
Yes, all MAX811 variants including MAX811MEUS and MAX811TEUS share identical 4-pin SOT143 pinout (VCC, MR, RESET, GND) and electrical interface. Only the reset threshold voltage differs (4.38V vs. 3.08V); no PCB layout change is required when substituting between 'M', 'T', 'S', 'R', or 'L' suffixes within the MAX811 family.
MAX811MEUS 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:
- 4.38V
- 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
MAX811MEUS FAQ
1.How can I place an order for MAX811MEUS through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX811MEUS 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 MAX811MEUS reliable?
The price and inventory of MAX811MEUS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX811MEUS is usually 5 days.
3.What payment methods are accepted for MAX811MEUS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX811MEUS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX811MEUS?
MAX811MEUS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX811MEUS 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 MAX811MEUS?
For technical support, including MAX811MEUS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX811MEUS requirements.
6.How does Aetrix verify that MAX811MEUS is sourced from the original manufacturer or authorized distributors?
All MAX811MEUS 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 MAX811MEUS meets industry standards.
7.What is the process for return or replacement of MAX811MEUS?
All MAX811MEUS units undergo pre-shipment inspection (PSI). If there is an issue with MAX811MEUS, 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 MAX811MEUS part is unused and in its original packaging.
Return procedure for MAX811MEUS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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