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Analog Devices Inc./Maxim Integrated MAX812REUS+T
- Part No.:
- MAX812REUS+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX812REUS+T.pdf
- Description:
- IC VOLT MON W/RESET SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,486
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Product details
Overview
MAX812REUS+T from Maxim Integrated is an active-high microprocessor supervisory circuit in a 4-pin SOT143 package, designed to monitor 2.63V power supplies and assert reset during brownout, power-up, or manual reset events. It guarantees RESET validity over -40°C to +85°C, delivers 140ms minimum reset timeout, and draws only 2.7µA typical supply current at 3.6V.
For engineers reviewing the MAX812REUS+T datasheet, MAX812REUS+T pinout, MAX812REUS+T application, or MAX812REUS+T equivalent, this page provides verified functional identity, exact reset threshold (2.63V), guaranteed temperature range, manual reset timing (10µs MR pulse width), and SOT143 terminal mapping - all critical for embedded μP power monitoring validation.
Technical Context
The MAX812REUS+T implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to detect VCC falling below 2.63V (±0.08V over temperature). Its internal timer ensures a minimum 140ms reset assertion after VCC recovery, independent of supply ramp rate.
It features a debounced manual reset input (MR) with 20kΩ internal pull-up, 100ns glitch immunity, and 0.5µs MR-to-RESET propagation delay. The active-high RESET output drives CMOS loads with VOH ≥ 0.8×VCC (ISOURCE = 500µA) and VOL ≤ 0.3V (ISINK = 1.2mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V nominal (2.55V to 2.70V over -40°C to +85°C); ensures reliable detection before system ICs drop below min operating voltage. |
| Reset Timeout | 140ms minimum; guarantees full μP initialization before release, even under slow VCC ramp conditions. |
| Supply Current | 2.7µA typical at 3.6V; enables multi-year battery life in portable equipment without compromising supervision integrity. |
| MR Pulse Width | 10µs minimum; supports fast mechanical switch bounce rejection and logic-level reset triggering. |
| Reset Propagation Delay | 0.5µs (MR to RESET); enables precise synchronization of reset initiation with external control signals. |
| Operating Temp Range | -40°C to +85°C; qualified for industrial-grade embedded systems without derating. |
| VCC Range | 1.2V to 5.5V; allows operation down to near-threshold voltages while maintaining valid RESET output. |
Pinout & Package
Package: 4-pin SOT143 (U4+1 outline, 21-0052), surface-mount, RoHS-compliant lead(Pb)-free.
| 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-high open-drain-compatible output; asserts high during reset condition (VCC < 2.63V or MR low) and remains high for ≥140ms after recovery. |
| 3 | MR | Active-low manual reset input with 20kΩ internal pull-up; initiates reset on logic-low transition and holds reset for 180ms after release. |
| 4 | VCC | Primary power supply input; powers internal circuitry and defines reset threshold reference; accepts 1.2V–5.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Pre-trimmed 2.63V threshold | Tight ±3% tolerance over temperature eliminates external resistor networks and calibration effort. |
| Integrated 140ms reset timer | Guaranteed minimum timeout removes need for external RC timing components and improves board-level reliability. |
| 20kΩ internal MR pull-up | Enables direct switch-to-ground connection without external biasing, reducing BOM count and layout complexity. |
| 100ns MR glitch immunity | Rejects EMI-induced noise on manual reset lines, preventing spurious resets in electrically noisy environments. |
| 0.8×VCC VOH drive strength | Ensures robust logic-high interface to modern low-voltage μPs (e.g., ARM Cortex-M0+) without level-shifting. |
Applications
| Industrial PLC Controllers | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Programmable logic controllers deployed in factory automation require deterministic reset behavior during line voltage sags or backup battery switchover. IC Role / Device Role / Timing Role: MAX812REUS+T monitors the 3.3V system rail and asserts active-high RESET to halt CPU execution until stable power resumes. Use Value: 2.63V threshold aligns with 3V I/O domain margin, ensuring reset triggers before FPGA configuration corruption occurs. | Use Scenario: Remote environmental sensors operate for years on coin-cell batteries and must survive cold-temperature voltage droop during wake-up cycles. IC Role / Device Role / Timing Role: MAX812REUS+T supervises the 3V supply and extends reset hold time to 140ms, allowing full ADC initialization before sampling begins. Use Value: 2.7µA supply current minimizes quiescent drain, extending operational lifetime by >15% versus higher-current supervisors. |
| Medical Point-of-Care Devices | Smart Energy Meters |
Use Scenario: Portable diagnostic tools must maintain data integrity during rapid battery replacement or USB power disconnect events. IC Role / Device Role / Timing Role: MAX812REUS+T detects VCC collapse below 2.63V and holds RESET high for ≥140ms, blocking flash writes during unsafe voltage windows. Use Value: Guaranteed operation down to VCC = 1.2V ensures reset assertion remains valid even as battery discharges to end-of-life. | Use Scenario: Utility meters experience frequent AC line transients and must prevent firmware corruption during grid disturbances. IC Role / Device Role / Timing Role: MAX812REUS+T monitors the isolated 3.3V auxiliary supply and rejects sub-100ns MR glitches caused by EFT bursts. Use Value: 100ns MR immunity prevents false resets during 4kV EFT testing per IEC 61000-4-4, meeting Class B compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3123E18DBVR | 2.93V fixed threshold, 200ms reset timeout, 1.8V–5.5V VCC range, SOT-23-5 package | Higher threshold better suited for 3.3V-only systems; longer timeout may delay system boot | Select when 2.93V trip point matches system rail tolerance and 5-pin footprint is acceptable |
| ADM6710LAKSZ-RL7 | 2.63V threshold, 200ms timeout, 1.2V–5.5V VCC, SC70-5 package, includes watchdog timer | Includes watchdog functionality not present in MAX812REUS+T; larger package footprint | Choose when system requires both power-on reset and periodic software supervision |
Compared with TPS3123E18DBVR and ADM6710LAKSZ-RL7, the MAX812REUS+T offers the shortest reset timeout (140ms), smallest footprint (SOT143), and lowest quiescent current (2.7µA), making it optimal for space-constrained, ultra-low-power 2.63V monitoring tasks where watchdog capability is unnecessary.
Availability
MAX812REUS+T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, medical point-of-care devices, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX812REUS+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 cost-sensitive, low-power microprocessor supervision - delivering integrated voltage monitoring, manual reset, and guaranteed reset timing in minimal 4-pin packages.
FAQ
What is the exact reset threshold voltage for MAX812REUS+T?
The MAX812REUS+T has a nominal reset threshold of 2.63V, with guaranteed limits of 2.55V (minimum) to 2.70V (maximum) over the full -40°C to +85°C operating temperature range. This value is laser-trimmed at wafer test and does not require external calibration. The 'R' suffix in MAX812REUS+T explicitly denotes the 2.63V threshold variant per Maxim's ordering matrix.
Does MAX812REUS+T provide a manual reset function, and how is it implemented?
Yes, MAX812REUS+T includes a dedicated manual reset input (MR) on Pin 3. It is an active-low signal with a 20kΩ internal pull-up resistor, allowing direct connection to a momentary switch tied to GND. A logic-low pulse ≥10µs on MR forces RESET high for ≥180ms after MR returns high, enabling field service or test-mode resets without external components.
What is the supply current consumption of MAX812REUS+T, and under what conditions is it measured?
The MAX812REUS+T draws 2.7µA typical supply current at VCC = 3.6V and TA = +25°C, with a maximum of 10µA over -40°C to +85°C. This ultra-low current is specified for the R/S/T series (2.63V/2.93V/3.08V thresholds) and enables multi-year operation in coin-cell-powered applications. Current increases slightly at higher VCC or temperature but remains below 15µA across full operating range.
How does the reset timeout period behave across temperature for MAX812REUS+T?
The MAX812REUS+T guarantees a minimum reset timeout of 140ms after VCC rises above the 2.63V threshold, with typical values ranging from 200ms to 230ms depending on temperature. Graphical data (MAX811/12-TOC5) shows timeout remains stable across -40°C to +85°C, varying less than ±5% - ensuring consistent μP initialization timing regardless of ambient conditions.
Can MAX812REUS+T interface directly with a microprocessor that has a bidirectional reset pin?
Yes, but a 4.7kΩ series resistor is recommended between MAX812REUS+T's RESET output (Pin 2) and the μP's bidirectional reset I/O to prevent contention. This isolates the supervisor's active-high drive from the μP's internal pull-up/pull-down, avoiding indeterminate logic states. The resistor value is non-critical and maintains signal integrity while eliminating potential bus conflicts during reset assertion.
MAX812REUS+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:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX812REUS+T FAQ
1.How can I place an order for MAX812REUS+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX812REUS+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 MAX812REUS+T reliable?
The price and inventory of MAX812REUS+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX812REUS+T is usually 5 days.
3.What payment methods are accepted for MAX812REUS+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX812REUS+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX812REUS+T?
MAX812REUS+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX812REUS+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 MAX812REUS+T?
For technical support, including MAX812REUS+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX812REUS+T requirements.
6.How does Aetrix verify that MAX812REUS+T is sourced from the original manufacturer or authorized distributors?
All MAX812REUS+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 MAX812REUS+T meets industry standards.
7.What is the process for return or replacement of MAX812REUS+T?
All MAX812REUS+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX812REUS+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 MAX812REUS+T part is unused and in its original packaging.
Return procedure for MAX812REUS+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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