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Analog Devices Inc./Maxim Integrated MAX6804US29D3
- Part No.:
- MAX6804US29D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6804US29D3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:551
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Product details
Overview
MAX6804US29D3 from Maxim Integrated is a push/pull, active-low microprocessor supervisory circuit designed for precise 2.93V power-supply monitoring in embedded systems. It asserts RESET when VCC drops below 2.93V 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 MAX6804US29D3 datasheet, MAX6804US29D3 pinout, MAX6804US29D3 application, or MAX6804US29D3 equivalent, key selection criteria include its factory-trimmed 2.93V threshold, guaranteed 100ms minimum reset timeout, push/pull active-low output structure, ultra-low 4–12µA supply current, and SOT143 package compatibility with MAX811/MAX812.
Technical Context
The MAX6804US29D3 implements a precision bandgap-based voltage comparator with ±1.8% threshold accuracy at +25°C and ±3% over –40°C to +125°C, rejecting fast transients via internal hysteresis and propagation delay filtering. Its reset logic guarantees valid RESET assertion and deassertion timing even as VCC falls to 0.7V, ensuring deterministic behavior during deep brownout conditions.
It integrates a debounced manual reset input (MR) with 20kΩ internal pullup, eliminating external RC networks, and features a fixed 100ms minimum reset timeout period - factory-programmed via the "D3" suffix - with no external capacitor required. The push/pull output drives high/low actively without external pullup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±1.8% (25°C), ±3% (–40°C to +125°C): ensures accurate 3.0V system brownout detection |
| Reset Timeout Period | ≥100ms: meets JEDEC JESD74A power-on reset hold-time requirements for most µPs |
| Supply Voltage Range | 0.7V to 5.5V: supports operation through deep brownout and battery discharge down to 0.7V |
| Supply Current | 4µA (typ @ 3.0V), 5µA (typ @ 5.0V): enables multi-year operation in coin-cell–powered IoT sensors |
| RESET Output Type | Active-low push/pull: eliminates need for external pullup resistor; sinks 3.2mA @ VCC ≥4.25V |
| MR Input | Debounced, 20kΩ internal pullup: allows direct connection of momentary switch to GND without external components |
| Operating Temperature | –40°C to +125°C: qualified for under-hood automotive and industrial control environments |
Pinout & Package
MAX6804US29D3 is housed in a 4-pin SOT143 surface-mount package (1.3mm × 2.1mm × 0.95mm), optimized for space-constrained PCB layouts in portable and automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and output stage; must be low-impedance return path |
| 2 | RESET | Active-low push/pull output; drives low during reset assertion, high (VCC) when deasserted; no external pullup needed |
| 3 | MR | Manual reset input; logic low (≤0.3×VCC) asserts reset; internally pulled up to VCC (20kΩ); float-safe if unused |
| 4 | VCC | Main supply input; powers internal circuitry and defines reset threshold reference; monitored continuously |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.93V threshold | Eliminates external resistor divider calibration; reduces BOM count and layout area in 3.0V systems |
| 100ms minimum reset timeout | Guarantees sufficient hold time for slow-starting µPs and flash memory initialization sequences |
| 0.7V minimum operating voltage | Ensures reset remains valid during severe brownout, preventing undefined µP state before full power collapse |
| 4µA typical supply current | Enables always-on supervision in energy-harvesting and battery-backed applications without measurable drain |
| Debounced MR with 20kΩ pullup | Removes need for external debounce capacitor or Schmitt trigger; simplifies front-panel reset implementation |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Monitors 3.3V supply rail in engine management MCU during cold cranking, where battery voltage dips to 6–8V causing regulator output sag. IC Role / Device Role / Timing Role: Supervisory reset generator asserting active-low RESET until VCC recovers above 2.93V and holds for ≥100ms. Use Value: Prevents ECU lockup or corrupted EEPROM writes during transient brownout by enforcing deterministic reset sequencing. |
Use Scenario: Ensures reliable startup of ARM-based controller in modular I/O base unit powered from isolated 3.3V DC-DC converter. IC Role / Device Role / Timing Role: Power-on reset supervisor with manual reset capability for field service and firmware recovery. Use Value: Guarantees µP enters known state before peripheral initialization, eliminating boot failures due to marginal VCC ramp rates. |
| Portable Medical Sensor Hub | Smart Meter Communication Module |
|
Use Scenario: Supervises coin-cell–backed 3.0V rail in wearable glucose monitor during battery replacement or low-voltage shutdown. IC Role / Device Role / Timing Role: Low-power brownout detector with 0.7V operational floor and <12µA ICC across temperature. Use Value: Maintains reset assertion down to near-zero VCC, preventing erratic sensor readings or BLE radio transmission during power collapse. |
Use Scenario: Provides tamper-resistant power supervision for NB-IoT modem in utility meter exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: High-temperature-rated (–40°C to +125°C) reset IC with factory-set 2.93V threshold matching LDO output tolerance. Use Value: Eliminates need for recalibration or margining; ensures consistent reset behavior across lifetime and environmental stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX811SUR29D3-T | Same 2.93V threshold and 100ms timeout, but uses older BiCMOS process; higher 15µA ICC (typ) | Lacks guaranteed operation down to 0.7V (valid only to 1.0V); less suitable for deep brownout scenarios | Select MAX6804US29D3 when 0.7V operation, lower ICC, or newer qualification data is required |
| TPS3808G33DBVR | 3.3V fixed threshold (not 2.93V); adjustable timeout (200ms default); 1.4µA ICC (typ); different pinout (SOT-23-5) | Requires PCB redesign; lacks MR input; better for ultra-low-power apps where 3.3V rail supervision suffices | Choose TPS3808G33DBVR only if 3.3V threshold matches system rail and SOT-23-5 layout is available |
Compared with MAX811SUR29D3-T and TPS3808G33DBVR, the MAX6804US29D3 uniquely combines 2.93V precision, 100ms timeout, 0.7V operation, and MR support in a pin-compatible SOT143 footprint - making it optimal for drop-in upgrades in legacy 3.0V µP designs requiring enhanced brownout robustness.
Availability
MAX6804US29D3 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, and portable medical sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6804US29D3 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX680x family was engineered specifically for cost-sensitive, space-constrained µP supervision in harsh environments - delivering precision voltage monitoring, guaranteed low-VCC operation, and integrated manual reset in minimal footprint.
FAQ
What is the exact reset threshold voltage of MAX6804US29D3?
The MAX6804US29D3 has a factory-trimmed reset threshold of 2.93V, with ±1.8% tolerance at +25°C and ±3% over the full –40°C to +125°C operating range. This value is confirmed in Table 1 of the official datasheet and corresponds to the "29" suffix in the part number. The threshold is referenced to VCC and remains stable across temperature and supply variations, making it suitable for precise 3.0V rail supervision.
Does MAX6804US29D3 require an external capacitor for reset timeout?
No, the MAX6804US29D3 does not require an external capacitor for reset timeout. Its 100ms minimum reset active period is factory-programmed and internally generated - indicated by the "D3" suffix in the part number. This eliminates timing component variability, PCB area, and reliability concerns associated with external RC networks, simplifying design and improving consistency across production batches.
Can MAX6804US29D3 operate when VCC drops below 1.0V?
Yes, the MAX6804US29D3 is guaranteed to maintain correct RESET/RESET output states down to VCC = 0.7V, as explicitly stated in the datasheet. This capability ensures deterministic reset behavior during deep brownout events common in automotive cold-crank or battery-depleted conditions - unlike many competing supervisors rated only to 1.0V or higher.
What is the function of the MR pin on MAX6804US29D3?
The MR (Manual Reset) pin on MAX6804US29D3 is a debounced, active-low input with a 20kΩ internal pullup resistor. Pulling MR to GND asserts RESET; release triggers a full 100ms reset timeout. Leaving MR unconnected defaults it to VCC via the internal pullup, making external components unnecessary. This enables simple, reliable front-panel or test-point reset functionality without added circuitry.
Is MAX6804US29D3 pin-compatible with MAX811 series devices?
Yes, the MAX6804US29D3 is pin-compatible with MAX811/MAX812 devices in the SOT143 package, sharing identical pin 1 (GND), pin 2 (RESET), pin 3 (MR), and pin 4 (VCC) assignments and electrical behavior. This allows direct replacement in existing designs to upgrade threshold accuracy, reduce supply current, or extend low-VCC operation - provided the 2.93V threshold aligns with system requirements.
MAX6804US29D3 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:
- 2.93V
- 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
MAX6804US29D3 FAQ
1.How can I place an order for MAX6804US29D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6804US29D3 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 MAX6804US29D3 reliable?
The price and inventory of MAX6804US29D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6804US29D3 is usually 5 days.
3.What payment methods are accepted for MAX6804US29D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6804US29D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6804US29D3?
MAX6804US29D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6804US29D3 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 MAX6804US29D3?
For technical support, including MAX6804US29D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6804US29D3 requirements.
6.How does Aetrix verify that MAX6804US29D3 is sourced from the original manufacturer or authorized distributors?
All MAX6804US29D3 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 MAX6804US29D3 meets industry standards.
7.What is the process for return or replacement of MAX6804US29D3?
All MAX6804US29D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6804US29D3, 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 MAX6804US29D3 part is unused and in its original packaging.
Return procedure for MAX6804US29D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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