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Analog Devices Inc./Maxim Integrated MAX6804US31D3
- Part No.:
- MAX6804US31D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6804US31D3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,022
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Product details
Overview
MAX6804US31D3 from Maxim Integrated is a push/pull active-low microprocessor supervisory circuit designed to monitor 3.08V power supplies in embedded systems. It asserts RESET when VCC falls below 3.08V or MR is pulled low, maintains reset for ≥100ms after recovery, and operates down to 0.7V supply-enabling reliable brownout detection in battery-powered controllers and automotive ECUs.
For engineers reviewing the MAX6804US31D3 datasheet, MAX6804US31D3 pinout, MAX6804US31D3 application, or MAX6804US31D3 equivalent, key selection criteria include its factory-trimmed 3.08V threshold, guaranteed 100ms minimum reset timeout, push/pull output drive capability, and SOT143 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX6804US31D3 implements a precision voltage comparator with ±3% threshold accuracy over –40°C to +125°C, immune to transients ≤30µs at 100mV overdrive. Its internal 20kΩ MR pullup eliminates external components, and reset assertion is synchronized to VCC crossing the 3.08V threshold with <1µs propagation delay.
Unlike open-drain alternatives, the push/pull output drives both high and low actively-ensuring valid logic levels without external pullups-and remains functional down to VCC = 0.7V, supporting safe shutdown sequencing in low-voltage microcontroller systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±3% (factory-trimmed; enables precise 3.3V rail monitoring) |
| Reset Timeout | ≥100ms (guaranteed minimum; ensures full µP initialization before release) |
| Supply Voltage Range | 0.7V to 5.5V (supports operation during deep brownout and cold-cranking) |
| Supply Current | 5µA typical at 5V (ultra-low power for always-on monitoring in portable devices) |
| MR Input Logic | Active-low with 20kΩ internal pullup (no external resistor needed for manual reset) |
| RESET Output Type | Push/pull active-low (drives low to <0.4V @ 3.2mA; no external pullup required) |
| Operating Temp | –40°C to +125°C (qualified for under-hood automotive and industrial environments) |
Pinout & Package
MAX6804US31D3 is housed in a 4-pin SOT143 package (2.9mm × 1.5mm × 1.1mm), optimized for high-density PCB layouts. Pin 1 is GND, Pin 2 is RESET (push/pull active-low), Pin 3 is MR (manual reset input), and Pin 4 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and output stage |
| 2 | RESET | Active-low push/pull output; sinks 3.2mA min at VCC ≥ 4.25V; drives high to ≥0.8×VCC |
| 3 | MR | Manual reset input; logic low asserts RESET; internally pulled up to VCC via 20kΩ |
| 4 | VCC | Power supply input; monitored for brownout; powers internal circuitry down to 0.7V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.08V with ±3% tolerance over full temperature range-eliminates calibration overhead |
| Guaranteed reset validity at low VCC | RESET remains asserted and electrically valid down to VCC = 0.7V-critical for fail-safe shutdown |
| No external components required | Integrated MR pullup and precision bandgap reference reduce BOM count and layout area |
| Transient-immune reset comparator | Rejects VCC glitches ≤30µs wide at 100mV overdrive-prevents spurious resets in noisy environments |
| Three standard timeout options | 100ms minimum timeout (D3 suffix) ensures compatibility with slow-start µPs and flash memory initialization |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply during vehicle cold-cranking where battery voltage dips to 6V–9V. IC Role / Device Role / Timing Role: Brownout detector and power-on reset generator with 100ms hold time for DSP core initialization. Use Value: Prevents erratic ECU behavior by asserting RESET until stable 3.3V rail is confirmed and µP firmware completes boot sequence. | Use Scenario: Ensures deterministic startup of ARM-based controller after AC line interruption or brownout. IC Role / Device Role / Timing Role: Primary reset supervisor with manual reset override for field service and firmware recovery. Use Value: Guarantees ≥100ms reset pulse even at –40°C ambient, meeting IEC 61000-4-11 immunity requirements. |
| Portable Medical Monitor | Smart Energy Meter |
Use Scenario: Maintains system integrity during Li-ion battery discharge from 4.2V to 2.8V, where 3.3V LDO output may sag. IC Role / Device Role / Timing Role: Low-power supply monitor with 5µA quiescent current and 3.08V trip point aligned to LDO dropout margin. Use Value: Extends usable battery life while ensuring clean reset before data corruption occurs at low VCC. | Use Scenario: Supervises metrology SoC power rails in utility-grade meters exposed to grid transients and lightning surges. IC Role / Device Role / Timing Role: Immune reset generator with 30µs glitch rejection-suppresses false resets from 100ns–1µs EFT bursts. Use Value: Meets ANSI C12.1 and IEC 62053-21 accuracy retention requirements during power disturbances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6314US31D3-T | Same 3.08V threshold and 100ms timeout, but includes watchdog timer function | Required where µP firmware must be verified periodically-not suitable for pure reset-only use cases | Select only if watchdog supervision is explicitly needed; adds complexity and cost |
| TLV803EB31DBZR | 3.08V threshold, 140ms min timeout, SOT23-3 package, no MR input | Lacks manual reset capability; smaller footprint but no field-service reset option | Prefer when board space is critical and manual reset is unnecessary |
Compared with MAX6804US31D3, MAX6314US31D3 adds watchdog functionality at the cost of higher quiescent current (1.5µA vs. 5µA) and larger die size, while TLV803EB31DBZR trades MR support and push/pull drive for compactness-making MAX6804US31D3 optimal for robust, serviceable reset supervision in constrained thermal environments.
Availability
MAX6804US31D3 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, and portable medical monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6804US31D3 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 power, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX680x series targets ultra-reliable, low-power microprocessor supervision-specifically engineered for brownout detection, power-on reset, and manual reset integration in safety-critical embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6804US31D3?
The MAX6804US31D3 has a factory-trimmed reset threshold of 3.08V, with guaranteed tolerance of ±3% over the full operating temperature range (–40°C to +125°C). This value is laser-trimmed during production and specified in Table 1 of the datasheet; it enables precise supervision of 3.3V power rails with adequate margin above LDO dropout voltage.
Does MAX6804US31D3 require an external pullup resistor on the RESET pin?
No, MAX6804US31D3 does not require an external pullup resistor because it features a push/pull output stage that actively drives both high and low states. The RESET pin sources current to maintain a valid high level (≥0.8×VCC) when deasserted and sinks up to 3.2mA when asserted-eliminating dependency on external biasing components.
What is the minimum supply voltage at which MAX6804US31D3 guarantees correct RESET output state?
MAX6804US31D3 guarantees correct RESET output state down to VCC = 0.7V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This allows the device to assert and hold RESET reliably during deep brownout conditions-unlike many competitors that lose output validity below 1.0V.
How is the 100ms reset timeout period implemented in MAX6804US31D3?
The 100ms reset timeout in MAX6804US31D3 is factory-programmed using on-chip RC timing elements and is guaranteed to be ≥100ms over temperature (–40°C to +125°C). The D3 suffix denotes this specific timeout; actual typical duration is 150ms, with maximum 200ms-ensuring sufficient hold time for slow-start µPs and flash memory initialization sequences.
Can MAX6804US31D3 be used with microcontrollers that have bidirectional reset pins?
No, MAX6804US31D3 is not recommended for direct interfacing with µPs having bidirectional reset pins (e.g., Motorola 68HC11), because its push/pull output cannot tolerate external voltage sources on the RESET line. For such applications, the open-drain MAX6805US31D3 variant-with external pullup-is the appropriate choice to avoid bus contention.
MAX6804US31D3 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 Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-4
MAX6804US31D3 FAQ
1.How can I place an order for MAX6804US31D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6804US31D3 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 reliable?
The price and inventory of MAX6804US31D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6804US31D3 is usually 5 days.
3.What payment methods are accepted for MAX6804US31D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6804US31D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6804US31D3?
MAX6804US31D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6804US31D3 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?
For technical support, including MAX6804US31D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6804US31D3 requirements.
6.How does Aetrix verify that MAX6804US31D3 is sourced from the original manufacturer or authorized distributors?
All MAX6804US31D3 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 meets industry standards.
7.What is the process for return or replacement of MAX6804US31D3?
All MAX6804US31D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6804US31D3, 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 part is unused and in its original packaging.
Return procedure for MAX6804US31D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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