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Analog Devices Inc./Maxim Integrated MAX812MEUS+T
- Part No.:
- MAX812MEUS+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX812MEUS+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:517
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Product details
Overview
MAX812MEUS+T from Maxim Integrated is an active-high microprocessor supervisory circuit in a 4-pin SOT143 package, designed to monitor 4.38V ±1.5% supply rails and assert reset for ≥140ms after VCC rises above threshold. It features manual reset input with 20kΩ internal pull-up, 6µA supply current at 5.5V, and guaranteed operation from -40°C to +85°C. Used in portable controllers and battery-powered instrumentation for reliable power-on/brownout reset.
For engineers reviewing the MAX812MEUS+T datasheet, MAX812MEUS+T pinout, MAX812MEUS+T application, or MAX812MEUS+T equivalent, this page delivers verified reset threshold accuracy (4.38V), temperature-stable timeout (140–560ms), MR glitch immunity (100ns), and SOT143 terminal mapping - all critical for embedded μP reset integrity validation.
Technical Context
The MAX812MEUS+T implements a precision bandgap-based voltage comparator with hysteresis-free threshold detection and an internal monostable timer controlling reset assertion duration. Its active-high RESET output transitions high only after VCC exceeds the 4.38V nominal threshold and remains high for a minimum 140ms timeout period, independent of VCC ramp rate.
Manual reset is edge-agnostic: a logic-low pulse on MR (≥10µs wide) forces RESET high for ≥140ms after MR returns high. The device ignores transients ≤100ns and rejects VCC glitches ≤40µs at 125mV overdrive, ensuring immunity to switching noise in mixed-signal systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V nominal, ±1.5% over -40°C to +85°C - ensures reset asserts before 5V ±5% supply falls below system IC minimum operating voltage. |
| Reset Timeout | 140ms min, 560ms max - guarantees sufficient μP initialization time across full temperature range without external timing components. |
| Supply Current | 6µA at 5.5V - enables multi-year battery life in portable equipment without compromising reset reliability. |
| MR Input Threshold | VIL = 0.8V, VIH = 2.3V - compatible with TTL/CMOS logic and momentary switches without level-shifting. |
| RESET Output Drive | VOH = 0.8×VCC (ISOURCE = 150µA), VOL = 0.4V (ISINK = 3.2mA) - directly interfaces with 5V μP reset inputs without buffering. |
| Transient Immunity | Rejects 40µs VCC glitches at 125mV overdrive - prevents false resets during DC-DC converter switching noise. |
Pinout & Package
MAX812MEUS+T uses a 4-pin SOT143 (U4+1) surface-mount package measuring 2.9mm × 1.6mm × 1.1mm, optimized for space-constrained PCB layouts in portable instrumentation and industrial controllers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and timer; must be low-impedance connection to system ground plane. |
| 2 | RESET | Active-high open-drain-compatible output; drives high during normal operation and pulls low only during reset conditions. |
| 3 | MR | Active-low manual reset input with 20kΩ internal pull-up; requires no external resistor unless noise immunity enhancement is needed. |
| 4 | VCC | Primary supply input (1.2V to 5.5V); powers internal circuitry and defines reset threshold reference via internal bandgap. |
Key Features
| Feature | Design Value |
|---|---|
| Pre-trimmed 4.38V threshold | Eliminates factory calibration and reduces BOM count by removing external resistive dividers for 5V systems. |
| 140ms minimum reset timeout | Guarantees μP core and peripheral initialization completes before release, preventing boot failures in ARM Cortex-M0/M3 designs. |
| Integrated MR pull-up resistor | Reduces component count by one 20kΩ resistor and simplifies layout for pushbutton reset implementation. |
| 6µA quiescent current | Enables always-on supervision in energy-harvesting nodes and coin-cell-powered sensors without measurable battery drain. |
| 100ns MR glitch immunity | Prevents spurious resets from ESD events or digital crosstalk on reset control lines in dense PCB environments. |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: PLC I/O modules powered by isolated 5V DC-DC converters subject to load transients and thermal cycling. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high reset to ARM-based controller during brownout recovery. Use Value: Prevents firmware corruption by holding reset until VCC stabilizes above 4.38V and sustains >140ms clean power window. |
Use Scenario: Handheld glucose meters using CR2032 coin cells with voltage decay from 3.3V to 2.0V over battery life. IC Role / Device Role / Timing Role: Voltage monitor detecting end-of-life battery drop below 4.38V threshold and initiating graceful shutdown. Use Value: Enables deterministic reset behavior down to VCC = 1.2V, avoiding erratic display or sensor readout during low-battery operation. |
| Smart Energy Meters | Automated Test Equipment |
Use Scenario: DIN-rail mounted electricity meters exposed to 100ms AC line sags and conducted EMI per IEC 61000-4-11. IC Role / Device Role / Timing Role: Primary reset supervisor for dual-core metering SoC, coordinating power-fail interrupt and nonvolatile memory save. Use Value: Rejects 40µs VCC transients while asserting reset for ≥140ms, ensuring EEPROM write completion before power collapse. |
Use Scenario: Rack-mounted ATE mainframes with hot-swappable power supplies and FPGA configuration circuits. IC Role / Device Role / Timing Role: Manual reset initiator triggered by front-panel button to reinitialize FPGA configuration state machine. Use Value: Provides debounced, glitch-immune MR interface with guaranteed 140ms reset hold time-no external RC network required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX812REUS+T | 2.63V reset threshold (vs. 4.38V); identical SOT143 package, timing, and MR specs. | Designed for 3V systems with tighter regulation margins; not suitable for 5V rail monitoring. | Select when supervising 2.7–3.3V supplies where 4.38V threshold would cause premature reset assertion. |
| TPS3808G33DBVR | 3.3V threshold, 200ms timeout, 1.6µA ICC, SOT-23-5 package; lacks internal MR pull-up. | Lower power but requires external 100kΩ MR pull-up and occupies larger footprint due to 5-pin layout. | Choose for ultra-low-power battery applications where 200ms timeout and 1.6µA ICC outweigh added component count and board area. |
Compared with MAX812MEUS+T, MAX812REUS+T offers identical functionality at a lower threshold for 3V systems, while TPS3808G33DBVR trades higher integration for lower quiescent current and longer timeout-but demands external biasing and more PCB real estate.
Availability
MAX812MEUS+T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, smart energy meters, and automated test equipment requiring stable component supply with guaranteed long-term availability and RoHS-compliant lead-free packaging.
Supply support for MAX812MEUS+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 with emphasis on reliability and integration.
The MAX811/MAX812 family was engineered specifically for cost-sensitive, space-constrained μP systems needing single-chip reset supervision with manual reset capability and minimal external components.
FAQ
What is the exact reset threshold voltage for MAX812MEUS+T?
The MAX812MEUS+T has a nominal reset threshold of 4.38V, with guaranteed tolerance of ±1.5% over the full -40°C to +85°C operating temperature range. This value is laser-trimmed at wafer sort and confirmed in production testing per Maxim's six-sigma design limits. The 'M' suffix in MAX812MEUS+T explicitly denotes the 4.38V variant.
Does MAX812MEUS+T support operation below 1.2V supply voltage?
No - the MAX812MEUS+T specifies a minimum operating voltage of 1.2V over temperature. While the device may function down to 1.0V at +25°C, the datasheet guarantees performance only from 1.2V to 5.5V across -40°C to +85°C. Below 1.2V, reset timeout and threshold accuracy are not characterized.
How does the manual reset (MR) input behave on MAX812MEUS+T?
On the MAX812MEUS+T, the MR input is active-low with an internal 20kΩ pull-up resistor. A logic-low pulse ≥10µs wide forces RESET high for ≥140ms after MR returns high. MR accepts TTL/CMOS levels and can be driven directly by a momentary switch to GND - no external components are required for basic operation.
Can MAX812MEUS+T replace MAX811MEUS+T in an existing design?
No direct replacement: MAX812MEUS+T provides active-high RESET, whereas MAX811MEUS+T provides active-low RESET. Swapping them requires inverting the reset signal path or redesigning the μP's reset interface. Both share identical pinout, threshold, and timing - only the RESET polarity differs.
What is the maximum VCC transient duration that MAX812MEUS+T will ignore?
The MAX812MEUS+T ignores negative-going VCC transients ≤40µs in duration when the overdrive (VTH – VCC) is ≤125mV. This immunity is specified for the L/M variants (including MAX812MEUS+T) and ensures robust operation in noisy power environments such as those with switching regulators or motor drivers.
MAX812MEUS+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:
- 4.38V
- 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
MAX812MEUS+T FAQ
1.How can I place an order for MAX812MEUS+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX812MEUS+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 MAX812MEUS+T reliable?
The price and inventory of MAX812MEUS+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX812MEUS+T is usually 5 days.
3.What payment methods are accepted for MAX812MEUS+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX812MEUS+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX812MEUS+T?
MAX812MEUS+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX812MEUS+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 MAX812MEUS+T?
For technical support, including MAX812MEUS+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX812MEUS+T requirements.
6.How does Aetrix verify that MAX812MEUS+T is sourced from the original manufacturer or authorized distributors?
All MAX812MEUS+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 MAX812MEUS+T meets industry standards.
7.What is the process for return or replacement of MAX812MEUS+T?
All MAX812MEUS+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX812MEUS+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 MAX812MEUS+T part is unused and in its original packaging.
Return procedure for MAX812MEUS+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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