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Analog Devices Inc./Maxim Integrated MAX812TEUS-T
- Part No.:
- MAX812TEUS-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX812TEUS-T.pdf
- Description:
- IC SUPERVISOR UPROCESSR VOLT MON
- Quantity:
- Payment:
- Shipping:
Inventory:3,734
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Product details
Overview
MAX812TEUS-T from Maxim Integrated is a low-power microprocessor supervisory circuit designed to monitor 3.08V supply rails in embedded digital systems. It asserts an active-high RESET signal when VCC falls below 3.08V (±0.08V over temperature), maintains reset for ≥140ms after recovery, and features a debounced manual reset input (MR) with 20kΩ internal pull-up. It is used in battery-powered controllers and portable instrumentation requiring reliable power-on reset.
For engineers reviewing the MAX812TEUS-T datasheet, MAX812TEUS-T pinout, MAX812TEUS-T application, or MAX812TEUS-T equivalent, key selection criteria include its 3.08V threshold accuracy, 6µA supply current at 3.6V, guaranteed operation down to VCC = 1V, SOT143-4 package compatibility, and immunity to sub-20µs VCC transients.
Technical Context
The MAX812TEUS-T implements a precision bandgap-based voltage comparator with hysteresis-free threshold detection and an internal timeout timer. Its reset assertion logic is triggered solely by VCC crossing the 3.08V threshold or by a low pulse on MR, with no external timing components required.
It features glitch-immune MR input (100ns rejection), 0.5µs MR-to-RESET propagation delay, and output drive capability of 150µA source / 1.2mA sink - sufficient to directly interface with standard CMOS microcontroller reset inputs without buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±0.08V (–40°C to +85°C); ensures reliable reset before system ICs drop below minimum operating voltage. |
| Supply Current | 2.7µA (typ) to 10µA (max) at 3.6V; enables multi-year battery life in portable equipment. |
| Reset Timeout | 140ms min power-on reset pulse width; satisfies boot-time requirements of most 8-/16-bit microcontrollers. |
| VCC Range | 1.2V to 5.5V operating range; supports valid reset assertion even during deep brownout down to 1.2V. |
| MR Input | Internal 20kΩ pull-up; allows direct connection of momentary switch to GND with no external components. |
| Transient Immunity | Rejects VCC glitches ≤20µs wide when VOD = 125mV; eliminates false resets from switching noise or ESD coupling. |
| Output Type | Active-high RESET; compatible with microcontrollers requiring high-valid reset assertion (e.g., many ARM Cortex-M0/M3). |
Pinout & Package
MAX812TEUS-T is housed in a lead-free 4-pin SOT143 package (outline 21-0052), measuring 2.9mm × 1.5mm × 1.1mm, with gull-wing leads optimized for automated assembly and thermal performance in space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: GND | Ground reference | Return path for all internal circuitry; must be connected to system ground plane with low-inductance trace. |
| 2: RESET | Active-high reset output | Drives high during normal operation; pulls low only during reset condition; sinks 1.2mA at VCC = VTH(MAX). |
| 3: MR | Manual reset input | Active-low; internally pulled up to VCC; accepts TTL/CMOS logic or mechanical switch to GND; no external debounce needed. |
| 4: VCC | Supply voltage input | Accepts 1.2V–5.5V; powers internal comparator and timer; requires local 0.1µF ceramic decoupling capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08V threshold | Tight ±0.08V tolerance over –40°C to +85°C ensures deterministic reset timing across industrial temperature range. |
| No external components | Integrates voltage reference, comparator, timer, and pull-up resistor - reduces BOM count and layout area by >3 components. |
| Guaranteed reset validity | RESET output remains functional down to VCC = 1V, enabling robust reset assertion even during severe brownout. |
| Low 2.7µA typical ICC | Minimizes quiescent load on battery or low-power LDOs - critical for always-on monitoring in IoT edge nodes. |
| MR glitch immunity | Rejects noise pulses <100ns on MR line, preventing spurious resets in electrically noisy environments (e.g., motor control). |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: PLC I/O modules powered from 3.3V rails with intermittent field power interruptions. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high reset to ARM Cortex-M4 MCU during brownout recovery. Use Value: Prevents firmware corruption by enforcing ≥140ms reset hold time after VCC recovers above 3.08V. |
Use Scenario: Handheld glucose meters using coin-cell batteries with declining voltage profiles. IC Role / Device Role / Timing Role: Voltage monitor triggering controlled shutdown and memory save before VCC drops below 3.0V. Use Value: 3.08V threshold aligns precisely with battery end-of-life voltage, maximizing usable runtime. |
| Smart Sensor Nodes | Energy Metering Modules |
Use Scenario: LoRaWAN sensor endpoints deployed outdoors with wide ambient temperature swings. IC Role / Device Role / Timing Role: Reset supervisor ensuring clean MCU boot across –40°C to +85°C with no calibration drift. Use Value: 30ppm/°C tempco and factory-trimmed threshold eliminate need for software compensation. |
Use Scenario: DIN-rail mounted electricity meters with isolated 3.3V auxiliary supply derived from mains. IC Role / Device Role / Timing Role: Brownout detector interfacing to dual-core metering SoC via shared reset bus. Use Value: Active-high RESET output matches SoC's native reset polarity, avoiding level-shifter components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3123E18DBVR | Fixed 1.8V threshold; 1.8µA ICC; SOT23-5 package; no manual reset input. | Suitable only for 1.8V systems; lacks MR functionality required for field-serviceable devices. | Select when supervising ultra-low-voltage logic rails and MR is unnecessary. |
| ADM6710LAKSZ-RL7 | 3.08V threshold; 1.2µA ICC; SC70-5 package; includes watchdog timer and power-fail comparator. | Higher integration adds complexity and cost; watchdog function unused in simple reset-only designs. | Select when system-level reliability requires watchdog supervision beyond basic voltage monitoring. |
Compared with TPS3123E18DBVR and ADM6710LAKSZ-RL7, the MAX812TEUS-T delivers optimal balance of precision 3.08V monitoring, ultra-low ICC, integrated MR, and minimal footprint - making it ideal for cost-sensitive, battery-operated 3.3V systems where simplicity and proven reliability are prioritized.
Availability
MAX812TEUS-T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, and smart sensor nodes requiring stable component supply and long-term manufacturability.
Supply support for MAX812TEUS-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 and mixed-signal ICs for industrial, automotive, and communications applications.
The MAX811/MAX812 family was engineered specifically for microprocessor power-supply supervision in space- and power-constrained embedded systems, emphasizing zero-component simplicity and guaranteed reset timing.
FAQ
What is the exact reset threshold voltage for MAX812TEUS-T?
The MAX812TEUS-T has a nominal reset threshold of 3.08V, with guaranteed limits of 3.00V (min) to 3.15V 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 suffix 'T' versions, ensuring consistent behavior across production lots without calibration.
Does MAX812TEUS-T support active-high reset for microcontrollers with high-valid reset inputs?
Yes, the MAX812TEUS-T provides an active-high RESET output, which drives high during normal operation and pulls low only during reset conditions. This matches the reset polarity requirement of many modern microcontrollers including STM32, NXP Kinetis, and Silicon Labs EFM32 families - eliminating the need for external inverters or level shifters.
Can MAX812TEUS-T operate reliably at VCC = 1.2V?
Yes, the MAX812TEUS-T is fully specified to operate down to VCC = 1.2V, with functional reset assertion guaranteed across the entire –40°C to +85°C range. Its internal circuitry remains active and the RESET output retains defined logic states even at this low supply voltage, supporting graceful shutdown in deep brownout scenarios.
Is external decoupling required for MAX812TEUS-T?
Yes, a 0.1µF ceramic capacitor must be placed between VCC and GND, located as close as possible to the MAX812TEUS-T pins. This capacitor stabilizes the internal reference, improves transient immunity against VCC glitches, and ensures accurate threshold detection - omission may cause erratic reset behavior or increased susceptibility to noise.
How does the manual reset (MR) input behave on MAX812TEUS-T?
The MR input on MAX812TEUS-T is active-low with an internal 20kΩ pull-up resistor to VCC. When pulled to GND (e.g., via momentary switch), it immediately asserts RESET low. After release, RESET remains low for ≥140ms due to the internal timeout timer - providing debounced, glitch-immune manual reset without external RC networks or firmware intervention.
MAX812TEUS-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:
- 3.08V
- 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
MAX812TEUS-T FAQ
1.How can I place an order for MAX812TEUS-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX812TEUS-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 MAX812TEUS-T reliable?
The price and inventory of MAX812TEUS-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX812TEUS-T is usually 5 days.
3.What payment methods are accepted for MAX812TEUS-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX812TEUS-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX812TEUS-T?
MAX812TEUS-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX812TEUS-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 MAX812TEUS-T?
For technical support, including MAX812TEUS-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX812TEUS-T requirements.
6.How does Aetrix verify that MAX812TEUS-T is sourced from the original manufacturer or authorized distributors?
All MAX812TEUS-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 MAX812TEUS-T meets industry standards.
7.What is the process for return or replacement of MAX812TEUS-T?
All MAX812TEUS-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX812TEUS-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 MAX812TEUS-T part is unused and in its original packaging.
Return procedure for MAX812TEUS-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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