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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:4,632
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Product details
Overview
MAX811LEUS-T from Maxim Integrated is an active-low microprocessor supervisory circuit in a 4-pin SOT143 package, designed to monitor 5V power supplies with a precision 4.63V reset threshold. It asserts RESET for ≥140ms after VCC rises above threshold, features 6µA supply current, and includes a debounced manual reset input (MR) for brownout and power-cycle recovery in embedded controllers.
For engineers reviewing the MAX811LEUS-T datasheet, MAX811LEUS-T pinout, MAX811LEUS-T application, or MAX811LEUS-T equivalent, this device serves as a low-power, temperature-stable voltage monitor for critical µP reset sequencing in portable and industrial systems where supply integrity below 1V must be maintained.
Technical Context
The MAX811LEUS-T implements a precision bandgap-based reset comparator with guaranteed operation down to VCC = 1V and built-in 140ms reset timeout timer. Its reset assertion logic is immune to transients ≤40µs at 125mV overdrive, and MR input includes internal 20kΩ pull-up with 10µs glitch immunity.
It operates across –40°C to +85°C with ±30ppm/°C reset threshold tempco and supports only 5V nominal supply (L-suffix variant), distinguishing it from T/S/R/M versions optimized for 3V/3.3V rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±1.5% - ensures reset triggers before 5V ±5% supply falls outside regulation limits |
| Supply Current | 6µA typical - enables multi-year battery life in portable equipment |
| Reset Timeout | ≥140ms - guarantees µP initialization completes before release |
| Operating Temp | –40°C to +85°C - qualified for industrial ambient environments |
| VCC Range | 1.0V to 5.5V - RESET remains valid down to 1V, enabling safe low-voltage shutdown detection |
| MR Input | Internal 20kΩ pull-up - eliminates external resistor; accepts TTL/CMOS logic or momentary switch to GND |
| Reset Output | Active-low open-drain - sinks 3.2mA at VTH(MAX); compatible with 5V µP reset inputs |
Pinout & Package
MAX811LEUS-T is housed in a 4-pin SOT143 package (4.0 × 2.0 × 1.75 mm), surface-mount, lead-free compatible. Pin 1 is VCC, Pin 2 is GND, Pin 3 is RESET (active-low open-drain), Pin 4 is MR (active-low manual reset).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 1.0V–5.5V; powers internal comparator and timer; reset behavior defined relative to this rail |
| GND | Ground reference | Common return path for all internal circuits and output sink current |
| RESET | Active-low reset output | Open-drain output; must be pulled up externally; asserted low during VCC undervoltage or MR activation |
| MR | Manual reset input | Active-low; internally pulled up to VCC; initiates reset when driven low; holds reset for 140ms after release |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.63V threshold | Guaranteed ±1.5% accuracy over temperature ensures reliable reset timing for 5V systems with ±5% supply tolerance |
| 1V VCC operation guarantee | RESET remains valid and actively driven low down to VCC = 1V - critical for detecting deep brownouts before µP latch-up |
| No external components | Integrated pull-up on MR and open-drain RESET eliminate need for discrete resistors or capacitors in basic configurations |
| Transient immunity | Rejects VCC glitches ≤40µs at 125mV overdrive - prevents spurious resets in noisy power environments |
| Low-temperature drift | ±30ppm/°C tempco maintains threshold stability across full industrial temperature range |
Applications
| Computers | Controllers |
|---|---|
Use Scenario: Desktop motherboard power-on sequence with 5V standby rail monitoring. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to x86 CPU until 5V rail stabilizes above 4.63V. Use Value: Prevents boot failure by ensuring CPU reset remains asserted ≥140ms after VCC crosses threshold, accommodating slow-rising ATX PSUs. | Use Scenario: PLC main controller board with isolated 5V logic supply. IC Role / Device Role / Timing Role: Voltage monitor triggering hardware reset during AC line sags or DC-DC converter faults. Use Value: Guarantees deterministic restart via MR pushbutton or automatic brownout response without firmware intervention. |
| Intelligent Instruments | Portable/Battery-Powered Equipment |
Use Scenario: Handheld multimeter with lithium coin-cell backup and 5V LDO-regulated main logic rail. IC Role / Device Role / Timing Role: Low-power supervisor detecting 5V rail collapse during battery depletion or load switching. Use Value: 6µA quiescent current extends battery life; 1V VCC validity allows detection of imminent power loss before µC becomes nonfunctional. | Use Scenario: Wireless sensor node powered by 5V USB or boost converter from single Li-ion cell. IC Role / Device Role / Timing Role: Reset sequencer ensuring clean startup after cold boot or wake-from-hibernate events. Use Value: MR input enables user-initiated reset without external debounce; SOT143 footprint minimizes PCB area in space-constrained designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX811MEUS-T | 4.38V reset threshold; otherwise identical electrical specs and pinout | Designed for 5V ±10% systems or legacy 5V rails with wider tolerance | Select when system VCC nominal is 5V but regulation window is wider than ±5% |
| TPS3808G15DBVR | Active-low, 1.5V threshold, 350ms timeout, 2.5µA ICC, SOT-23-5 package | Lower voltage monitoring; longer timeout; requires external pull-up and no MR input | Choose for ultra-low-power 1.8V/3.3V systems where manual reset is unnecessary and longer reset hold time is acceptable |
Compared with MAX811MEUS-T, the MAX811LEUS-T provides tighter threshold alignment for tightly regulated 5V supplies; versus TPS3808G15DBVR, it offers integrated MR functionality and lower cost in 5V applications but lacks sub-2V monitoring capability.
Availability
MAX811LEUS-T is available at Aetrix Electronics and suitable for computers, controllers, intelligent instruments, and portable/battery-powered equipment requiring stable component supply, long-term lifecycle support, and industrial-grade temperature performance.
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, computing, communications, and consumer applications.
The MAX811/MAX812 family delivers compact, low-power µP supervisory solutions targeting cost-sensitive embedded systems needing reliable power-on reset, brownout protection, and manual reset capability in minimal footprint.
FAQ
What is the reset threshold voltage of the MAX811LEUS-T?
The MAX811LEUS-T has a nominal reset threshold voltage of 4.63V with ±1.5% accuracy over temperature. This value is factory-trimmed and specified for operation with 5V-powered systems. The threshold remains stable across –40°C to +85°C with a tempco of ±30ppm/°C, ensuring consistent reset behavior in industrial environments.
Does the MAX811LEUS-T support manual reset functionality?
Yes, the MAX811LEUS-T includes a dedicated MR (manual reset) input that is active-low. When pulled low, it asserts the RESET output for the full 140ms timeout period, even if VCC remains stable. An internal 20kΩ pull-up resistor allows MR to be left unconnected when unused, and it accepts TTL/CMOS logic levels or direct connection to a momentary switch to ground.
Can the MAX811LEUS-T operate reliably at very low supply voltages?
Yes, the MAX811LEUS-T guarantees valid RESET output down to VCC = 1V - a key differentiator for brownout detection. Below 1V, the RESET output transitions to high-impedance, but the device continues to monitor VCC. For applications requiring RESET validity down to 0V, a 100kΩ pull-down resistor on the RESET pin is recommended.
What package type and dimensions does the MAX811LEUS-T use?
The MAX811LEUS-T is supplied in a 4-pin SOT143 package measuring 4.0mm × 2.0mm × 1.75mm. It follows EIA-481-1 marking standards and is available in both leaded and lead-free variants (the "-T" suffix denotes lead-free). Pin 1 is VCC, Pin 2 is GND, Pin 3 is RESET, and Pin 4 is MR - matching the standard MAX811 pinout.
How does the MAX811LEUS-T handle power supply transients?
The MAX811LEUS-T rejects short-duration negative-going VCC transients: it will not assert reset for glitches ≤40µs wide when the overdrive (VTH – VCC) is 125mV, and ≤20µs for smaller overdrives. This immunity is achieved through internal comparator hysteresis and filtering, eliminating need for external RC networks in most noise-prone applications.
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:
- Obsolete
- 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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