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Analog Devices Inc./Maxim Integrated MAX811TEUS-T
- Part No.:
- MAX811TEUS-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX811TEUS-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,440
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Product details
Overview
MAX811TEUS-T from Maxim Integrated is an active-low microprocessor supervisory circuit in a 4-pin SOT143 package, designed to monitor 3.08V supply rails with ±1.5% threshold accuracy over -40°C to +85°C. It asserts RESET for ≥140ms after VCC rises above threshold, draws only 6µA supply current, and features a debounced manual reset input (MR) with internal 20kΩ pull-up-used in battery-powered embedded controllers to prevent erroneous code execution during brownout.
For engineers reviewing the MAX811TEUS-T datasheet, MAX811TEUS-T pinout, MAX811TEUS-T application, or MAX811TEUS-T equivalent, key selection criteria include guaranteed RESET validity down to VCC = 1V, immunity to ≤40µs/125mV VCC transients, compatibility with 3V systems requiring tight threshold tolerance, and SOT143 footprint constraints for space-constrained PCB layouts.
Technical Context
The MAX811TEUS-T implements a precision bandgap-based voltage comparator with factory-trimmed 3.08V reset threshold (T-suffix), referenced to an internal stable reference. Its reset timeout is generated by an on-chip RC timer, ensuring ≥140ms assertion of active-low RESET after VCC exceeds VTH, independent of external components.
It integrates a debounced manual reset input (MR) with 20kΩ internal pull-up, supporting TTL/CMOS logic levels and open-drain drivers. MR assertion holds RESET low for the full tRP (140–560ms) after MR returns high, and the device guarantees RESET output state integrity down to VCC = 1V-critical for low-voltage brownout detection in 3V microcontroller systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V nominal, ±1.5% over temperature - ensures reliable detection before 3V µP operating range violation |
| Supply Current | 6µA typical at +25°C - enables multi-year battery life in portable instrumentation |
| Reset Timeout | ≥140ms minimum - meets JEDEC JESD78 requirement for power-on reset pulse width |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and valid RESET assertion down to 1V |
| MR Input Threshold | VIL = 0.25×VCC, VIH = 0.7×VCC - compatible with 3V CMOS logic without level-shifting |
| Transient Immunity | Rejects ≤40µs negative VCC glitches ≥125mV below VTH - eliminates false resets in noisy power environments |
| Tempco | 30ppm/°C - maintains threshold stability across industrial temperature range |
Pinout & Package
Package: 4-pin SOT143 (1.75mm × 2.0mm × 0.95mm), surface-mount, lead-free compatible (EUS-T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Positive supply input | Monitored power rail; device operates and asserts RESET only when VCC ≥ 1.2V |
| 2: MR | Manual reset input | Active-low; internally pulled up to VCC via 20kΩ; initiates reset on logic low, holds RESET for tRP after release |
| 3: RESET | Active-low reset output | Open-drain output; sinks ≥1.2mA at VCC = VTH(MIN); guaranteed low for VCC > 1V |
| 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 3.08V threshold | Factory-trimmed to ±1.5% over -40°C to +85°C - eliminates need for external calibration in 3V systems |
| 6µA ultra-low ICC | Reduces quiescent load on coin-cell or Li-ion backup supplies - extends shelf life in always-on monitoring nodes |
| Guaranteed RESET to VCC = 1V | Ensures deterministic reset state during deep undervoltage - prevents metastability in µP reset latches |
| No external components required | Integrates reference, comparator, timer, and pull-up - reduces BOM count and PCB area vs. discrete supervisor solutions |
| MR debounce via internal timer | Eliminates need for external RC filter or firmware debouncing - simplifies hardware design and improves reliability |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG sensor powered by CR2032 coin cell, requiring reliable reset during battery voltage sag. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to ARM Cortex-M0 microcontroller during <3.08V brownout. Use Value: 6µA supply current extends battery life beyond 3 years; 140ms reset pulse ensures full µP initialization before peripheral enable. | Use Scenario: DIN-rail mounted analog input module exposed to 24VDC supply ripple and EFT noise. IC Role / Device Role / Timing Role: Brownout detector holding µP in reset until 3.08V rail stabilizes post-transient. Use Value: 40µs/125mV VCC transient immunity prevents spurious resets during 2kV EFT bursts per IEC 61000-4-4. |
| Smart Utility Meters | Automotive Body Control Units |
Use Scenario: AMI meter with dual-supply (3.3V MCU + 1.8V RF SoC) where main 3.3V rail must be monitored. IC Role / Device Role / Timing Role: Primary supervisor for 3.3V domain, triggering system-wide reset if rail drops below 3.08V. Use Value: ±1.5% threshold accuracy ensures reset occurs before 3.3V µP violates 3.0V min spec - avoids flash corruption. | Use Scenario: BCM module powered from vehicle battery (9–16V) with local 3.3V LDO supplying MCU. IC Role / Device Role / Timing Role: Monitoring 3.3V LDO output to detect LDO failure or excessive load drop. Use Value: Valid RESET down to VCC = 1V allows safe shutdown sequencing even during severe battery dip to 6V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3123E18DBVR | 3.08V threshold, but active-high RESET output; 1.8V min VCC operation; 1.2µA ICC | Requires logic inversion or µP with active-high reset input; better for ultra-low-power sleep modes | Select if system uses active-high reset architecture and demands sub-2µA quiescent current |
| STM6315RWX6F | 3.08V threshold, active-low RESET, but 10µA ICC and 200ms timeout; no MR input | Lacks manual reset capability; longer timeout may delay system recovery in fast-cycle applications | Choose when MR functionality is unnecessary and higher ICC is acceptable for extended reset hold time |
Compared with TPS3123E18DBVR and STM6315RWX6F, the MAX811TEUS-T uniquely combines guaranteed RESET validity to 1V, integrated MR with internal pull-up, and industry-standard 140ms timeout-all in a proven SOT143 footprint-making it optimal for cost-sensitive, space-constrained 3V µP systems requiring robust manual and power-fail reset control.
Availability
MAX811TEUS-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart utility meters, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX811TEUS-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, communications, and computing applications.
The MAX811/MAX812 family was engineered specifically for low-cost, low-power microprocessor supervision in space- and power-constrained embedded systems-delivering factory-trimmed voltage thresholds, integrated timing, and manual reset in minimal footprint.
FAQ
What is the exact reset threshold voltage of the MAX811TEUS-T?
The MAX811TEUS-T has a nominal reset threshold voltage of 3.08V, with guaranteed accuracy of ±1.5% over the full -40°C to +85°C operating temperature range. This value is factory-trimmed and specified in the Electrical Characteristics table under "Reset Threshold" for the T-suffix variant. The threshold remains stable with a tempco of 30ppm/°C, making it suitable for precise 3V system monitoring.
Does the MAX811TEUS-T provide a manual reset function, and how is it implemented?
Yes, the MAX811TEUS-T includes a dedicated manual reset input (MR) on Pin 2. MR is active-low and features an internal 20kΩ pull-up resistor to VCC, allowing it to be left unconnected when unused. Driving MR low initiates a reset, and RESET remains asserted for the full Reset Active Timeout Period (140–560ms) after MR returns high-no external debounce circuitry is required.
Can the MAX811TEUS-T operate reliably when VCC drops below 2V?
Yes-the MAX811TEUS-T guarantees correct RESET output behavior down to VCC = 1V. Below 1V, the RESET output becomes high-impedance (open-circuit), but for all VCC ≥ 1V, RESET remains a valid active-low signal capable of sinking ≥1.2mA. This ensures deterministic reset assertion during deep brownout conditions common in battery-powered systems.
What is the maximum VCC transient duration the MAX811TEUS-T can ignore without issuing a false reset?
For a 125mV negative-going VCC transient (i.e., VCC dipping 125mV below the 3.08V threshold), the MAX811TEUS-T will not issue a false reset if the transient duration is ≤40µs. This immunity is confirmed in the Typical Operating Characteristics graphs and applies specifically to the T/S/R variants (3V–3.3V operation). Adding a 0.1µF capacitor near VCC further enhances noise rejection.
Is the MAX811TEUS-T pin-compatible with other members of the MAX811/MAX812 family?
Yes-the MAX811TEUS-T shares identical pinout, package (SOT143), and functional interface with all MAX811 variants (e.g., MAX811LEUS-T, MAX811MEUS-T) and MAX812 variants. The only differences between family members are reset threshold voltage (determined by suffix letter) and RESET polarity (MAX811 = active-low, MAX812 = active-high). No PCB layout changes are needed when substituting within the same package and polarity group.
MAX811TEUS-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:
- 3.08V
- 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
MAX811TEUS-T FAQ
1.How can I place an order for MAX811TEUS-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX811TEUS-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 MAX811TEUS-T reliable?
The price and inventory of MAX811TEUS-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX811TEUS-T is usually 5 days.
3.What payment methods are accepted for MAX811TEUS-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX811TEUS-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX811TEUS-T?
MAX811TEUS-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX811TEUS-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 MAX811TEUS-T?
For technical support, including MAX811TEUS-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX811TEUS-T requirements.
6.How does Aetrix verify that MAX811TEUS-T is sourced from the original manufacturer or authorized distributors?
All MAX811TEUS-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 MAX811TEUS-T meets industry standards.
7.What is the process for return or replacement of MAX811TEUS-T?
All MAX811TEUS-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX811TEUS-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 MAX811TEUS-T part is unused and in its original packaging.
Return procedure for MAX811TEUS-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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