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Analog Devices Inc./Maxim Integrated MAX6804US31D3+T
- Part No.:
- MAX6804US31D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6804US31D3+T.pdf
- Description:
- IC RESET MPU LOW PWR SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,078
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Product details
Overview
MAX6804US31D3+T from Maxim Integrated is a 4-pin SOT143 push/pull active-low microprocessor supervisory circuit designed for precise power supply monitoring in embedded systems. It asserts RESET when VCC drops below 3.08V (±3% over temperature) or upon manual reset, with a guaranteed 100ms minimum timeout and valid operation down to VCC = 0.7V. Used in battery-powered controllers and industrial µP systems requiring reliable brownout detection.
For engineers reviewing the MAX6804US31D3+T datasheet, MAX6804US31D3+T pinout, MAX6804US31D3+T application, or MAX6804US31D3+T equivalent, this device delivers factory-trimmed threshold accuracy, ultra-low 4µA supply current, and integrated MR debouncing - critical for space-constrained, low-power reset supervision without external components.
Technical Context
The MAX6804US31D3+T implements a precision bandgap-based reset comparator with ±3% threshold tolerance over –40°C to +125°C and immunity to fast VCC transients (e.g., ≤30µs at 10V/ms). Its push/pull RESET output drives high-impedance µP reset inputs directly without pull-up resistors, supporting logic-level compatibility across 2.85V–5.0V supply rails.
It integrates an internal 20kΩ MR pullup resistor and guarantees correct RESET/RESET state down to VCC = 0.7V, enabling robust reset assertion during deep brownout conditions. The 100ms minimum timeout period is factory-programmed and fully specified across temperature, eliminating timing uncertainty in power-on sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±3% over –40°C to +125°C - ensures accurate brownout detection for 3.3V systems with margin. |
| Reset Timeout Period | 100ms minimum - guarantees sufficient hold time for µP initialization before release. |
| Supply Current | 4µA typical 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 severe undervoltage events. |
| MR Input Logic | Active-low with 20kΩ internal pullup - eliminates need for external pullup and simplifies switch interface. |
| RESET Output Type | Push/pull active-low - drives µP reset pins directly without external pull-up resistor. |
| VCC Transient Immunity | Rejects <30µs negative glitches at 10V/ms - prevents false resets from power rail noise. |
Pinout & Package
MAX6804US31D3+T is housed in a 4-pin SOT143 package (U4-1 outline, 21-0052), optimized for space-constrained PCB layouts with 1.3mm × 2.1mm footprint and gull-wing leads.
| 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 weakly when deasserted (VOH ≥ 0.8×VCC). |
| 3 | MR | Manual-reset input - logic low asserts reset; internally pulled up to VCC (20kΩ); no external components needed. |
| 4 | VCC | Primary supply input - powers internal circuitry and defines reset threshold reference; operates down to 0.7V. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.08V threshold | Eliminates external resistor networks and calibration - reduces BOM count and layout area. |
| 100ms min reset timeout | Ensures µP core and peripherals fully stabilize before release - avoids boot failures in complex firmware. |
| 4µA supply current | Enables integration into always-on monitoring paths without impacting system standby power budget. |
| Guaranteed operation to VCC = 0.7V | Maintains deterministic reset state during deep brownout - critical for fail-safe shutdown in industrial systems. |
| Debounced MR input | Accepts mechanical switch inputs directly - removes need for RC filters or digital debounce logic. |
Applications
| Industrial PLC Controllers | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Power cycling due to fluctuating 24V DC bus in factory automation cabinets. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output feeding the PLC's ARM Cortex-M4 MCU; asserts RESET during 10–50ms brownouts. Use Value: Prevents corrupted register writes and flash programming errors by enforcing 100ms minimum reset hold time after voltage recovery. |
Use Scenario: Intermittent solar charging causing repeated 3.0–3.5V supply dips in remote environmental sensors. IC Role / Device Role / Timing Role: Supervises the 3.3V supply to an ultra-low-power MSP430 microcontroller; triggers clean reboot on each dip below 3.08V. Use Value: Achieves >5-year field deployment using coin-cell backup, enabled by 4µA quiescent current and no external components. |
| Medical Infusion Pumps | Automotive Body Control Modules |
|
Use Scenario: Battery voltage sag during motor startup causing temporary MCU reset loss. IC Role / Device Role / Timing Role: Resets the safety-critical pump controller MCU when VCC falls below 3.08V; holds RESET until stable for ≥100ms. Use Value: Meets IEC 62304 Class C software requirements by guaranteeing deterministic reset behavior down to 0.7V supply. |
Use Scenario: Load-dump transients and cold-crank events inducing 2.5–3.8V fluctuations on 3.3V domain. IC Role / Device Role / Timing Role: Provides fail-safe reset supervision for CAN-enabled microcontrollers; rejects sub-30µs transients per ISO 7637-2. Use Value: Eliminates false resets during engine cranking while ensuring valid reset assertion during sustained brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX811LCS31D3+T | Same 3.08V threshold and 100ms timeout, but higher 15µA supply current and only rated to +85°C. | Limited to commercial-temperature industrial controls; not suitable for under-hood automotive use. | Select when cost sensitivity outweighs extended temperature range and ultra-low power needs. |
| TPS3808G33DBVR | 3.3V threshold (not 3.08V), 200ms timeout, 1.1µA supply current, and wider 1.8–6.0V operating range. | Better for 3.3V systems needing tighter threshold match and longer timeout; requires external MR pullup. | Choose for lower power and broader VCC range, accepting 0.22V higher threshold and added MR component. |
Compared with MAX811LCS31D3+T and TPS3808G33DBVR, the MAX6804US31D3+T uniquely combines 3.08V precision, 100ms timing, 4µA consumption, and full –40°C to +125°C operation in a single 4-pin SOT143 package - making it optimal for high-reliability embedded systems where voltage margin and thermal robustness are critical.
Availability
MAX6804US31D3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, medical infusion pumps, and automotive body control modules requiring stable component supply with full RoHS-compliant lead-free packaging.
Supply support for MAX6804US31D3+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 demanding industrial, medical, and automotive applications, emphasizing reliability, low power, and integration.
The MAX6804US31D3+T belongs to Maxim's µP supervisory circuit product line, engineered specifically for deterministic power-on reset, brownout protection, and manual reset functionality in space- and power-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6804US31D3+T?
The MAX6804US31D3+T has a factory-trimmed reset threshold of 3.08V at +25°C, with ±3% tolerance over the full –40°C to +125°C operating temperature range. This value is confirmed in Table 1 of the official datasheet and applies specifically to the "31" suffix variant, ensuring accurate supervision for 3.3V nominal systems with appropriate headroom.
Does the MAX6804US31D3+T require external components for basic operation?
No, the MAX6804US31D3+T requires no external components for core functionality. Its internal 20kΩ MR pullup resistor enables direct connection of a momentary switch to GND, and the push/pull RESET output drives µP reset inputs without a pull-up resistor. Only decoupling capacitance near VCC is recommended per best practices.
What is the guaranteed minimum reset timeout period for the MAX6804US31D3+T?
The MAX6804US31D3+T guarantees a minimum reset timeout period of 100ms after VCC rises above the 3.08V threshold or after the MR input is deasserted. This value is factory-programmed (denoted by the "D3" in the part number) and fully specified across temperature, ensuring consistent boot sequencing reliability.
Can the MAX6804US31D3+T operate reliably during deep brownout conditions?
Yes, the MAX6804US31D3+T is guaranteed to maintain correct RESET assertion state down to VCC = 0.7V, as verified in the Absolute Maximum Ratings and Electrical Characteristics tables. This allows deterministic reset behavior even during severe undervoltage events common in battery-backed or unregulated power domains.
Is the MAX6804US31D3+T pin-compatible with other supervisory ICs?
The MAX6804US31D3+T uses the standard 4-pin SOT143 package and shares identical pinout (GND, RESET, MR, VCC) with MAX811/MAX812 and MAX6314/MAX6315 families. However, functional equivalence - especially regarding threshold, timeout, and output structure - must be verified per application; it is not a drop-in replacement for all variants in those families.
MAX6804US31D3+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:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6804US31D3+T FAQ
1.How can I place an order for MAX6804US31D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6804US31D3+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 MAX6804US31D3+T reliable?
The price and inventory of MAX6804US31D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6804US31D3+T is usually 5 days.
3.What payment methods are accepted for MAX6804US31D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6804US31D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6804US31D3+T?
MAX6804US31D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6804US31D3+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 MAX6804US31D3+T?
For technical support, including MAX6804US31D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6804US31D3+T requirements.
6.How does Aetrix verify that MAX6804US31D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6804US31D3+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 MAX6804US31D3+T meets industry standards.
7.What is the process for return or replacement of MAX6804US31D3+T?
All MAX6804US31D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6804US31D3+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 MAX6804US31D3+T part is unused and in its original packaging.
Return procedure for MAX6804US31D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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