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Analog Devices Inc./Maxim Integrated MAX812SEUS-T
- Part No.:
- MAX812SEUS-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX812SEUS-T.pdf
- Description:
- MAX812 4-PIN MICRO PROCESSOR VOL
- Quantity:
- Payment:
- Shipping:
Inventory:105,000
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Product details
Overview
MAX812SEUS-T from onsemi is an active-high microprocessor reset monitor IC designed to supervise 2.93 V nominal VCC rails in embedded systems. It delivers a guaranteed minimum 140 ms reset pulse width, triggers within 20 µs of VCC falling below threshold, and operates with only 7 µA supply current at 3.3 V - enabling reliable brownout detection in battery-powered equipment.
For engineers reviewing the MAX812SEUS-T datasheet, MAX812SEUS-T pinout, MAX812SEUS-T application, or MAX812SEUS-T equivalent, key selection criteria include its SOT-143-4 package, 2.93 V reset threshold with ±1.5% accuracy over temperature, manual reset input compatibility, and guaranteed VCC transient immunity up to 200 mV overdrive.
Technical Context
The MAX812SEUS-T integrates a precision voltage comparator with hysteresis and a fixed 140 ms reset timeout timer. Its internal reference is trimmed to 2.93 V (±1.5% over –40°C to +85°C) and exhibits 30 ppm/°C tempco for stable threshold behavior across industrial temperature ranges.
It features a dedicated manual reset (MR) input with 0.15×VCC logic thresholds, 10 µs minimum pulse width requirement, and 0.1 µs glitch immunity - supporting robust push-button interface without external debouncing circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93 V ±1.5% (guaranteed over –40°C to +85°C; enables precise supervision of 3.0 V or 3.3 V rails) |
| Reset Timeout Duration | 140–560 ms (minimum guaranteed 140 ms ensures sufficient processor initialization time) |
| VCC to RESET Delay | 20 µs max (ensures rapid response to power sags before system instability occurs) |
| Supply Current | 7 µA at VCC = 3.3 V (supports multi-year operation in coin-cell–powered IoT sensors) |
| Operating Temp Range | –40°C to +85°C (meets industrial-grade environmental requirements) |
| Reset Output Polarity | Active-high (drives high during fault; compatible with processors requiring active-high reset assertion) |
| VCC Transient Immunity | Rejects glitches ≤200 mV overdrive × 1 µs duration (prevents false resets from switching noise) |
Pinout & Package
MAX812SEUS-T is housed in a 4-pin SOT-143 (Case 318A) surface-mount package measuring 3.04 mm × 1.39 mm × 1.14 mm, optimized for space-constrained PCB layouts in portable and industrial control applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output driver; must be low-impedance connection to system ground plane |
| 2 | RESET | Active-high open-drain output; requires external pull-up to VCC for logic-high state; sinks up to 1.2 mA |
| 3 | MR | Manual reset input; asserted low (≤0.15×VCC); 10 µs minimum pulse width; internally pulled up to VCC via 10–40 kΩ resistor |
| 4 | VCC | Primary supply input; monitors this rail for reset generation; accepts 1.2 V to 5.5 V operation |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93 V reset threshold | ±1.5% tolerance over full temperature range ensures accurate supervision of 3.0 V/3.3 V systems without calibration |
| Guaranteed 140 ms minimum reset pulse | Meets Intel and ARM processor reset timing requirements for safe core initialization and peripheral stabilization |
| No external components required | Integrates reference, comparator, timer, and pull-up on MR - reduces BOM count and layout area by ≥3 passive parts |
| 7 µA quiescent current | Enables >10-year battery life in always-on monitoring applications powered by CR2032 cells |
| VCC transient rejection | Immune to sub-microsecond supply glitches up to 200 mV amplitude - eliminates need for bulk decoupling near VCC pin |
Applications
| Industrial PLC I/O Modules | Medical Portable Monitors |
|---|---|
Use Scenario: Power sequencing and brownout recovery in DIN-rail mounted programmable logic controllers with isolated analog I/O. IC Role / Device Role / Timing Role: System supervisor that asserts active-high RESET to halt CPU execution until 3.3 V rail stabilizes post-power-up or during line sag. Use Value: Prevents firmware corruption and analog front-end latch-up by guaranteeing ≥140 ms reset hold time after VCC exceeds 2.93 V. | Use Scenario: Battery-backed vital signs monitors requiring continuous operation and fail-safe restart on power interruption. IC Role / Device Role / Timing Role: VCC supervisor monitoring the main 3.0 V supply; generates clean reset pulse to ARM Cortex-M4 MCU upon battery voltage dip. Use Value: 7 µA supply current extends single-CR2032 runtime beyond 5 years in sleep mode; 20 µs response prevents data loss during transient dips. |
| Smart Energy Meters | Automotive Body Control Modules |
Use Scenario: Revenue-grade electricity meters exposed to wide ambient temperatures and conducted EMI on AC mains lines. IC Role / Device Role / Timing Role: Reset generator supervising the 3.3 V LDO output feeding metrology SoC and RF transceiver. Use Value: 30 ppm/°C tempco maintains threshold stability across –40°C to +85°C; rejects 200 mV/1 µs transients induced by relay switching. | Use Scenario: Low-power body controller managing door locks, lighting, and window motors in 12 V automotive systems with LDO-regulated 3.3 V domain. IC Role / Device Role / Timing Role: Supervises 3.3 V rail derived from vehicle battery; provides active-high reset to Infineon AURIX TC3xx during cold-crank events. Use Value: Valid operation down to VCC = 1.2 V ensures reset assertion even during deep battery sag to 9 V; MR pin supports service-mode forced reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX811SEUS-T | Active-low RESET output; identical 2.93 V threshold, timing, and package | Requires inverted reset logic path; incompatible with processors mandating active-high assertion | Select when host MCU reset pin is active-low and board layout cannot accommodate level-shifting |
| TPS3808G18DBVR | 2.5 V threshold (not 2.93 V); adjustable delay option; 1.5 µA typical ICC; SOT-23-5 package | Lacks manual reset input; requires external capacitor for timeout tuning; higher pin count | Choose for ultra-low-power designs where 2.5 V supervision suffices and manual reset is unnecessary |
Compared with MAX811SEUS-T and TPS3808G18DBVR, the MAX812SEUS-T uniquely combines fixed 2.93 V supervision, active-high output, integrated MR input, and SOT-143-4 footprint - making it optimal for cost-sensitive, space-constrained 3.0 V/3.3 V systems needing guaranteed reset polarity and no external timing components.
Availability
MAX812SEUS-T is available at Aetrix Electronics and suitable for industrial PLCs, portable medical devices, smart energy meters, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for MAX812SEUS-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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MAX81x series was engineered specifically for reliable, low-cost microprocessor reset supervision in space- and power-constrained embedded systems - emphasizing precision threshold accuracy, minimal external components, and robust transient immunity.
FAQ
What is the reset threshold voltage of the MAX812SEUS-T?
The MAX812SEUS-T has a factory-trimmed reset threshold of 2.93 V with ±1.5% tolerance over the full operating temperature range (–40°C to +85°C). This value is specified in the Electrical Characteristics table of the official onsemi datasheet (Rev. 4, May 2002), and applies to all units marked "S" in the ordering code - confirming precise supervision of 3.0 V and 3.3 V power rails without external calibration.
Does the MAX812SEUS-T require external components to function?
No, the MAX812SEUS-T requires no external components to perform basic reset supervision. It integrates a precision voltage reference, comparator, 140 ms timeout timer, and internal pull-up resistor on the MR pin. The only external requirement is a pull-up resistor on the RESET pin to establish the high logic state - a standard practice for open-drain outputs. This eliminates capacitors, resistors, or diodes typically needed in discrete reset circuits.
What is the supply current consumption of the MAX812SEUS-T at 3.3 V?
The MAX812SEUS-T draws 7 µA typical supply current at VCC = 3.3 V and TA = +25°C, with a maximum of 15 µA over temperature (–40°C to +85°C). This ultra-low ICC enables multi-year operation in battery-powered applications such as portable diagnostics equipment and wireless sensor nodes, as confirmed in the Electrical Characteristics section of the onsemi MAX811/MAX812 datasheet.
Can the MAX812SEUS-T be used with a 1.8 V supply rail?
No - the MAX812SEUS-T is not rated for reliable operation at 1.8 V. Its minimum functional VCC is 1.2 V, but its 2.93 V reset threshold requires the monitored rail to reach at least ~3.0 V for proper supervision. For 1.8 V systems, onsemi offers the MAX812FEUS-T (1.75 V threshold) or MAX812TEUS-T (3.08 V), both in the same SOT-143 package. Using MAX812SEUS-T on 1.8 V would result in permanent reset assertion.
How does the manual reset (MR) input behave on the MAX812SEUS-T?
The MR input on the MAX812SEUS-T is active-low with logic thresholds of VIH = 0.7×VCC and VIL = 0.15×VCC. It features an internal 10–40 kΩ pull-up resistor, allowing direct connection to a momentary switch tied to GND. A minimum 10 µs low pulse is required to trigger reset, and the input rejects glitches shorter than 0.1 µs - eliminating need for RC filtering in most push-button implementations.
MAX812SEUS-T 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:
- 2.93V
- 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
MAX812SEUS-T FAQ
1.How can I place an order for MAX812SEUS-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX812SEUS-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 MAX812SEUS-T reliable?
The price and inventory of MAX812SEUS-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX812SEUS-T is usually 5 days.
3.What payment methods are accepted for MAX812SEUS-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX812SEUS-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX812SEUS-T?
MAX812SEUS-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX812SEUS-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 MAX812SEUS-T?
For technical support, including MAX812SEUS-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX812SEUS-T requirements.
6.How does Aetrix verify that MAX812SEUS-T is sourced from the original manufacturer or authorized distributors?
All MAX812SEUS-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 MAX812SEUS-T meets industry standards.
7.What is the process for return or replacement of MAX812SEUS-T?
All MAX812SEUS-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX812SEUS-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 MAX812SEUS-T part is unused and in its original packaging.
Return procedure for MAX812SEUS-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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