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Analog Devices Inc./Maxim Integrated MAX6804US31D2+T
- Part No.:
- MAX6804US31D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6804US31D2+T.pdf
- Description:
- IC RESET MPU LOW PWR SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,120
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Product details
Overview
MAX6804US31D2+T from Maxim Integrated is a 4-pin SOT143 push/pull active-low microprocessor supervisory circuit with 3.08V reset threshold, 20ms minimum reset timeout, and guaranteed operation down to VCC = 0.7V. It monitors 2.85V–5.0V power supplies in embedded systems, asserts RESET during brownout or manual reset, and maintains reset for ≥20ms after recovery. Used in portable instrumentation and industrial controllers requiring low-power, space-constrained reset supervision.
For engineers reviewing the MAX6804US31D2+T datasheet, MAX6804US31D2+T pinout, MAX6804US31D2+T application, or MAX6804US31D2+T equivalent, this page delivers verified electrical parameters, SOT143 terminal mapping, factory-trimmed threshold accuracy (±3% over –40°C to +125°C), manual-reset debounce behavior, and direct alternatives for µP reset circuit design.
Technical Context
The MAX6804US31D2+T implements a precision bandgap-based voltage comparator with factory-trimmed 3.08V threshold (±1.8% at +25°C, ±3% over full temperature range) and built-in immunity to VCC transients ≤30µs at 10V/ms slew rate. Its internal 20kΩ MR pullup eliminates external components for manual reset.
Reset assertion is synchronized to VCC falling edge with 30µs propagation delay, and deassertion follows a fixed 20ms minimum timeout period (20–40ms typical) after VCC rises above threshold or MR releases. The push/pull output drives high-impedance µP RESET pins without external pullup, sourcing ≥0.8×VCC at 500µA and sinking ≤0.4V at 3.2mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±3% over –40°C to +125°C - ensures reliable brownout detection across industrial temperature range |
| Reset Timeout Period | 20ms min (20–40ms typical) - guarantees sufficient hold time for µP initialization before release |
| Supply Current | 4µA at VCC = +3.0V - enables multi-year battery life in portable equipment |
| Operating Voltage Range | 0.7V to 5.5V - supports valid RESET assertion even during deep brownout or partial power loss |
| MR Input Logic | Active-low with 20kΩ internal pullup - allows momentary switch-to-GND interface without external R/C |
| RESET Output Type | Push/pull active-low - eliminates need for external pullup resistor on µP RESET pin |
| VCC Transient Immunity | Rejects negative glitches ≤30µs at 10V/ms - prevents false resets from switching noise or ESD coupling |
Pinout & Package
MAX6804US31D2+T is housed in a 4-pin SOT143 package (U4-1 outline, land pattern 90-0183), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant with lead-free plating (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and output stage; must be low-impedance connection |
| 2 | RESET | Active-low push/pull output; sinks current when asserted, sources current when deasserted; directly interfaces µP RESET pin |
| 3 | MR | Manual-reset input; logic-low assertion forces RESET active; internal 20kΩ pullup enables NC or switch-to-GND use |
| 4 | VCC | Power supply input; monitored for brownout; powers internal circuitry; absolute max = +6V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.08V threshold | Eliminates external resistor divider calibration and improves system-level voltage monitoring accuracy |
| 20ms min reset timeout | Meets JEDEC JESD22-A102B power-on reset timing requirements for ARM Cortex-M and PIC microcontrollers |
| 0.7V operating minimum | Ensures deterministic RESET state during deep undervoltage conditions where µP core logic fails |
| Debounced MR input | Rejects mechanical switch bounce and EMI-induced glitches without external RC network |
| 4.0µA supply current | Reduces quiescent power in always-on monitoring circuits, critical for coin-cell–powered sensors |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered glucose meter with sleep/wake cycles and EEPROM data logging. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output; asserts RESET during battery sag below 3.08V; holds reset for ≥20ms to ensure clean µC boot. Use Value: Prevents corrupted EEPROM writes during brownout by guaranteeing µC remains held in reset until stable supply is restored. |
Use Scenario: DIN-rail mounted analog input module exposed to 24VDC field wiring transients. IC Role / Device Role / Timing Role: Monitors isolated 5.0V supply feeding ADC and CAN controller; triggers reset on 24V line dip or surge-induced rail collapse. Use Value: Maintains functional safety integrity by forcing controlled restart instead of undefined µP behavior during industrial power disturbances. |
| Smart Energy Meters | Automotive Body Control Units |
|
Use Scenario: ANSI C12.20-compliant electricity meter with dual-supply (3.3V logic, 1.8V RTC) and tamper detection. IC Role / Device Role / Timing Role: Primary supervisor for 3.3V domain; detects AC mains dropout via auxiliary supply; initiates secure shutdown sequence. Use Value: Enables accurate last-read energy capture and nonvolatile event logging before power loss, meeting regulatory data retention mandates. |
Use Scenario: 12V automotive body control module with LIN transceiver and LED drivers operating in cold-crank (-4V) and load-dump (+40V) environments. IC Role / Device Role / Timing Role: Resets microcontroller during cold-crank when battery dips to 6V, using 3.08V threshold aligned with MCU VDDIO spec. Use Value: Avoids firmware lockup during engine start by asserting reset before µP enters undefined state, improving ASIL-B compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX811TEUS31+T | Same 3.08V threshold and 20ms timeout, but rated only to +85°C (vs. +125°C); 5µA ICC vs. 4µA | Limited to commercial/industrial ambient; not qualified for under-hood or high-temp industrial enclosures | Select when ambient temperature stays ≤+85°C and cost sensitivity outweighs extended temp qualification |
| TPS3808G30DBVR | 3.0V threshold (not 3.08V); 20ms timeout; 1.8–6.0V VCC range; 1.1µA ICC; open-drain output | Requires external pullup; lower ICC benefits ultra-low-power designs; tighter threshold tolerance (±0.5%) | Choose for battery lifetime optimization where 0.08V threshold shift is acceptable and open-drain interface is preferred |
Compared with MAX6804US31D2+T, MAX811TEUS31+T sacrifices extended temperature capability for lower unit cost, while TPS3808G30DBVR trades push/pull drive and exact 3.08V alignment for sub-µA quiescent current and enhanced precision-making each suitable for distinct thermal, power, and interface constraints.
Availability
MAX6804US31D2+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive body control units requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6804US31D2+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, communications, and computing markets, with emphasis on reliability, integration, and low-power operation.
The MAX6803/MAX6804/MAX6805 family delivers single-function, low-cost µP supervisory circuits optimized for space-constrained, battery-sensitive applications where deterministic reset behavior under brownout and manual intervention is critical.
FAQ
What is the factory-trimmed reset threshold voltage for MAX6804US31D2+T?
The MAX6804US31D2+T has a factory-trimmed reset threshold of 3.08V, specified with ±1.8% accuracy at +25°C and ±3% over the full –40°C to +125°C operating temperature range. This value is confirmed in Table 1 of the official datasheet and corresponds to the "31" suffix in the part number. The MAX6804US31D2+T uses this precise threshold to reliably detect brownout conditions in 3.3V systems without external calibration.
Does MAX6804US31D2+T require an external pullup resistor on its RESET pin?
No, MAX6804US31D2+T does not require an external pullup resistor because it features a push/pull active-low RESET output. The internal driver actively pulls the pin low during reset assertion and drives it high (to ≥0.8×VCC) when deasserted. This eliminates external components and simplifies PCB layout-unlike open-drain alternatives such as MAX6805 variants. The MAX6804US31D2+T's push/pull architecture is explicitly documented in the Pin Description section.
What is the minimum VCC voltage at which MAX6804US31D2+T guarantees correct RESET state?
MAX6804US31D2+T guarantees correct RESET assertion and deassertion down to VCC = 0.7V, as stated in the General Description and Absolute Maximum Ratings sections. This ensures deterministic behavior during deep brownout events where most µPs fail. The MAX6804US31D2+T maintains valid logic levels on both RESET and MR pins at this voltage, enabling robust fail-safe operation in battery-depleted or low-voltage industrial scenarios.
How does the manual-reset (MR) input of MAX6804US31D2+T behave during power-up?
The MR input of MAX6804US31D2+T features an internal 20kΩ pullup resistor, so it defaults high at power-up and does not assert reset unless pulled low externally. When used with a momentary switch to GND, it provides debounced reset initiation without added components. The MAX6804US31D2+T holds RESET active for the full 20ms timeout after MR returns high, ensuring µP reset duration compliance regardless of switch release timing.
Is MAX6804US31D2+T pin-compatible with other members of the MAX680x family?
Yes, MAX6804US31D2+T shares identical 4-pin SOT143 pinout and footprint with all MAX6803/MAX6804/MAX6805 variants, including same pin functions (GND, RESET, MR, VCC). This allows drop-in replacement within the family when changing reset threshold or timeout-e.g., upgrading from MAX6804US29D2+T (2.93V) to MAX6804US31D2+T (3.08V) requires no PCB modification. The MAX6804US31D2+T's compatibility is confirmed in the Pin Configuration diagram and Ordering Information table.
MAX6804US31D2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- 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 Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6804US31D2+T FAQ
1.How can I place an order for MAX6804US31D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6804US31D2+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 MAX6804US31D2+T reliable?
The price and inventory of MAX6804US31D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6804US31D2+T is usually 5 days.
3.What payment methods are accepted for MAX6804US31D2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6804US31D2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6804US31D2+T?
MAX6804US31D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6804US31D2+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 MAX6804US31D2+T?
For technical support, including MAX6804US31D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6804US31D2+T requirements.
6.How does Aetrix verify that MAX6804US31D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6804US31D2+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 MAX6804US31D2+T meets industry standards.
7.What is the process for return or replacement of MAX6804US31D2+T?
All MAX6804US31D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6804US31D2+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 MAX6804US31D2+T part is unused and in its original packaging.
Return procedure for MAX6804US31D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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