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Analog Devices Inc./Maxim Integrated MAX811SEUS
- Part No.:
- MAX811SEUS
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX811SEUS.pdf
- Description:
- POWER SUPPLY SUPPORT CIRCUIT, FI
- Quantity:
- Payment:
- Shipping:
Inventory:1,629
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Product details
Overview
MAX811SEUS from Maxim Integrated is an active-low microprocessor supervisory circuit in a 4-pin SOT143 package, designed to monitor 2.93V power supplies and assert reset during brownout or power-up events. It delivers 6µA supply current, guarantees RESET validity down to VCC = 1V, and provides 140ms minimum reset timeout-enabling reliable startup in portable battery-powered systems.
For engineers reviewing the MAX811SEUS datasheet, MAX811SEUS pinout, MAX811SEUS application, or MAX811SEUS equivalent, key selection criteria include reset threshold accuracy (±1.5% over temperature), MR input glitch immunity (100ns), guaranteed low-power operation across -40°C to +85°C, and compatibility with 3V/3.3V µP reset interfaces requiring debounced manual reset capability.
Technical Context
The MAX811SEUS implements a precision voltage comparator with factory-trimmed 2.93V threshold and 30ppm/°C tempco, ensuring robust brownout detection across industrial temperature ranges. Its internal timer generates a fixed 140ms reset pulse after VCC rises above threshold, independent of supply ramp rate.
It features an integrated 20kΩ MR pull-up resistor and supports TTL/CMOS-compatible manual reset assertion via logic-low MR signal. The active-low RESET output sinks 1.2mA at VCC = VTH(MIN) and remains valid down to VCC = 1V-critical for deterministic µP initialization in low-voltage shutdown sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V nominal ±1.5% over -40°C to +85°C-ensures reset asserts before system ICs drop below minimum operating voltage |
| Supply Current | 6µA typical at +25°C-enables multi-year battery life in portable instrumentation |
| Reset Timeout | 140ms minimum after VCC rise-guarantees sufficient µP initialization time regardless of clock speed |
| MR Glitch Immunity | 100ns maximum-rejects EMI-induced noise on manual reset line without external filtering |
| VCC Range | 1.2V to 5.5V-supports operation during deep brownout and full 5V system power |
| RESET Validity | Guaranteed low state down to VCC = 1V-prevents floating reset inputs in ultra-low-power sleep modes |
| Tempco | 30ppm/°C-limits threshold drift to <15mV over full temperature range, avoiding false resets |
Pinout & Package
MAX811SEUS is housed in a 4-pin SOT143 package (4.0 × 2.0 × 1.75 mm), surface-mountable with gull-wing leads. Pin 1 is VCC, Pin 2 is GND, Pin 3 is RESET (active-low open-drain), and Pin 4 is MR (active-low manual reset input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 1.2V–5.5V; powers internal comparator and timer; threshold sensing reference |
| GND | Ground reference | Return path for all internal currents; must be low-impedance to ensure accurate threshold detection |
| RESET | Active-low reset output | Open-drain output sinking up to 1.2mA; requires external pull-up; asserted low during fault or MR activation |
| MR | Active-low manual reset input | Internally pulled up to VCC via 20kΩ; logic-low assertion forces RESET low for ≥140ms after release |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93V threshold | Factory-trimmed to ±1.5% tolerance over temperature-eliminates need for external calibration in 3V systems |
| 140ms power-on reset timeout | Internally timed, temperature-stable delay-ensures µP completes internal reset sequence before code execution |
| MR with 20kΩ internal pull-up | Enables direct switch-to-ground connection without external components-reduces BOM count and PCB area |
| RESET valid to VCC = 1V | Guaranteed low-state output down to 1V supply-prevents undefined logic states during battery depletion |
| 6µA quiescent current | Ultra-low ICC enables use in always-on monitoring circuits without compromising battery runtime |
Applications
| Portable Medical Sensors | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered glucose meters requiring guaranteed reset during cold-start and low-battery conditions. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M0 MCU until regulated 3.0V rail stabilizes. Use Value: 2.93V threshold aligns precisely with 3V system brownout margin; 6µA ICC extends single-CR2032 battery life beyond 2 years. | Use Scenario: DIN-rail mounted programmable logic controller with 24VDC input converted to 3.3V for microcontroller core. IC Role / Device Role / Timing Role: Voltage monitor detecting 3.3V rail collapse during ESD transients or load switching. Use Value: 100ns MR glitch immunity prevents spurious resets from industrial noise; 140ms timeout ensures firmware recovery after brief dips. |
| Handheld Test Equipment | Smart Energy Meters |
Use Scenario: Multifunction calibrator with auto-ranging analog front-end and real-time OS. IC Role / Device Role / Timing Role: Primary reset supervisor for dual-core application processor, coordinating power sequencing with PMIC. Use Value: RESET validity to VCC = 1V ensures deterministic shutdown state during battery swap-no data corruption on power loss. | Use Scenario: ANSI C12.20-compliant electricity meter with tamper-detection circuitry and secure boot. IC Role / Device Role / Timing Role: Critical power monitor verifying 3V backup supply integrity before enabling secure crypto engine. Use Value: Factory-trimmed 2.93V threshold matches supercapacitor hold-up voltage profile-avoids premature reset during grid outage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G12DBVR | 2.93V threshold, but 350ms reset timeout and 1.5µA ICC; no internal MR pull-up | Requires external 100kΩ MR pull-up; longer timeout may delay µP startup in time-critical systems | Select when ultra-low ICC dominates design priority and extended reset duration is acceptable |
| ADM6710L29ARTZ-R7 | 2.93V threshold, 200ms timeout, 8µA ICC; MR input lacks internal pull-up | Needs external pull-up and RC debounce; higher ICC reduces battery life vs. MAX811SEUS | Choose for ADI ecosystem integration where timing margin allows 200ms reset and layout permits extra passives |
Compared with TPS3808G12DBVR and ADM6710L29ARTZ-R7, the MAX811SEUS offers the shortest guaranteed reset timeout (140ms) and lowest component count due to its integrated MR pull-up-making it optimal for space-constrained, battery-sensitive designs where deterministic fast startup is required.
Availability
MAX811SEUS is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC controllers, and handheld test equipment requiring stable component supply with guaranteed long-term availability.
Supply support for MAX811SEUS 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, and communications applications.
The MAX811SEUS belongs to Maxim's µP supervisory product line, engineered specifically for low-power, high-reliability voltage monitoring in battery-operated and mission-critical embedded systems.
FAQ
What is the exact reset threshold voltage for MAX811SEUS?
The MAX811SEUS has a nominal reset threshold of 2.93V, with ±1.5% accuracy over the full -40°C to +85°C temperature range. This value is factory-trimmed and specified in the Electrical Characteristics table under VTH parameter for the 'S' suffix variant. The threshold remains stable with a tempco of 30ppm/°C, ensuring minimal drift across operating conditions.
Does MAX811SEUS require external components for basic operation?
No, the MAX811SEUS operates autonomously with no external components required for core supervision. It integrates a 20kΩ internal pull-up resistor on the MR pin and uses an open-drain RESET output that only needs an external pull-up if driving CMOS loads. The device monitors VCC directly and asserts reset based on internal precision threshold comparison-eliminating trimming resistors, capacitors, or voltage dividers.
How does MAX811SEUS handle power-down events below 1V?
When VCC falls below 1V, the MAX811SEUS RESET output transitions to a high-impedance state rather than actively driving low. This behavior is explicitly guaranteed in the datasheet. To maintain a defined logic level in such cases, a 100kΩ pull-down resistor on the RESET line is recommended-ensuring the µP receives a clean low signal even during deep brownout or battery exhaustion, preventing undefined startup states.
What is the minimum pulse width required on the MR pin to trigger reset in MAX811SEUS?
The MAX811SEUS requires a minimum MR pulse width of 10µs to reliably initiate a reset event, as specified under tMR in the Electrical Characteristics table. Pulses shorter than this may be ignored due to internal glitch filtering. Once asserted, RESET remains active for the full 140ms timeout period-even if MR returns high earlier-ensuring complete µP initialization regardless of manual press duration.
Can MAX811SEUS be used with 5V microcontrollers?
Yes, the MAX811SEUS supports VCC from 1.2V to 5.5V and is fully compatible with 5V µPs. Its 2.93V reset threshold is intended for 3V systems, but the device itself operates correctly with 5V supply. When interfacing with 5V logic, ensure the RESET output pull-up is connected to the 5V rail and verify sink current capability (1.2mA at VCC = VTH(MIN)) meets the µP's input requirements-no level-shifting is needed.
MAX811SEUS 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:
- -
- Type:
- Power Supply Monitor
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-4
MAX811SEUS FAQ
1.How can I place an order for MAX811SEUS through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX811SEUS 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 MAX811SEUS reliable?
The price and inventory of MAX811SEUS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX811SEUS is usually 5 days.
3.What payment methods are accepted for MAX811SEUS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX811SEUS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX811SEUS?
MAX811SEUS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX811SEUS 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 MAX811SEUS?
For technical support, including MAX811SEUS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX811SEUS requirements.
6.How does Aetrix verify that MAX811SEUS is sourced from the original manufacturer or authorized distributors?
All MAX811SEUS 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 MAX811SEUS meets industry standards.
7.What is the process for return or replacement of MAX811SEUS?
All MAX811SEUS units undergo pre-shipment inspection (PSI). If there is an issue with MAX811SEUS, 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 MAX811SEUS part is unused and in its original packaging.
Return procedure for MAX811SEUS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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