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Analog Devices Inc./Maxim Integrated MAX6804US29D3+T
- Part No.:
- MAX6804US29D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6804US29D3+T.pdf
- Description:
- IC RESET MPU LOW PWR SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,490
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Product details
Overview
MAX6804US29D3+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 2.93V (±3% over temperature) or upon manual reset, with a guaranteed 100ms minimum timeout period and operation down to 0.7V supply voltage. Used in critical µP power monitoring for industrial controllers and portable equipment.
For engineers reviewing the MAX6804US29D3+T datasheet, MAX6804US29D3+T pinout, MAX6804US29D3+T application, or MAX6804US29D3+T equivalent, key selection criteria include its factory-trimmed 2.93V threshold, 100ms reset timeout, push/pull active-low output, ultra-low 4µA supply current, and guaranteed reset validity down to VCC = 0.7V across –40°C to +125°C.
Technical Context
The MAX6804US29D3+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 internal 20kΩ MR pullup eliminates external components, and reset assertion is synchronized to VCC recovery with fixed 100ms timeout after VCC rises above 2.93V or MR deassertion.
This device operates as a single-function supervisor: no watchdog, no voltage sequencing, no window detection-only monotonic VCC monitoring and debounced manual reset. Its push/pull RESET output drives CMOS inputs directly without external pullup, supporting reliable reset signaling in low-power battery-operated systems where supply collapse below 1V must still guarantee valid logic levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±3% over –40°C to +125°C - ensures deterministic brownout detection at nominal 2.93V with tight thermal drift control |
| Reset Timeout Period | 100ms minimum - guarantees sufficient processor initialization time after power stabilization |
| Supply Voltage Range | 0.7V to 5.5V - enables operation during deep brownout and supports 3.3V/5V systems |
| Supply Current | 4µA typical at 3.0V - minimizes quiescent load in battery-powered applications |
| Output Type | Push/pull active-low RESET - eliminates need for external pullup resistor and ensures defined logic level at all VCC ≥ 0.7V |
| MR Input | Debounced, internally pulled up to VCC (20kΩ) - allows direct connection of momentary switch to GND without external RC network |
| Operating Temperature | –40°C to +125°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
MAX6804US29D3+T is housed in a 4-pin SOT143 package (U4-1 outline, land pattern 90-0183), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads suitable for automated assembly and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and reset comparator; must be low-impedance connection to system ground plane |
| 2 | RESET | Active-low push/pull output; sinks current when asserted (low), sources weakly when deasserted (high); valid down to VCC = 0.7V |
| 3 | MR | Manual-reset input; logic-low assertion triggers reset; internally pulled up to VCC (20kΩ); requires no external components |
| 4 | VCC | Primary power supply input; monitored for brownout; supports operation from 0.7V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.93V threshold | Eliminates external resistor divider calibration and reduces BOM count in production designs |
| 100ms minimum reset timeout | Ensures full microcontroller boot sequence completion before release, preventing premature execution |
| 0.7V minimum operating voltage | Guarantees functional reset assertion even during severe brownout conditions common in battery discharge profiles |
| 4µA supply current | Extends battery life in always-on monitoring applications such as smart sensors and IoT edge nodes |
| Debounced MR with 20kΩ internal pullup | Removes need for external debounce circuitry or firmware polling, simplifying hardware and software design |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: PLC I/O modules powered from unregulated 3.3V rails subject to transient dips during relay switching. IC Role / Device Role / Timing Role: Monitors VCC and asserts active-low RESET to halt CPU execution until rail stabilizes above 2.93V for ≥100ms. Use Value: Prevents corrupted register writes and firmware lockups caused by marginal supply conditions during field operation. |
Use Scenario: Handheld glucose meters using coin-cell batteries with steep discharge curves dropping below 3.0V. IC Role / Device Role / Timing Role: Detects battery voltage decay below 2.93V and holds microcontroller in reset until replacement or recharge. Use Value: Avoids erratic behavior or data loss during low-battery operation while consuming only 4µA quiescent current. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: BCMs exposed to cold-crank events where battery voltage collapses to 6V–8V for 50–100ms. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output and asserts RESET if input dip propagates below 2.93V, with 100ms hold-off post-recovery. Use Value: Ensures deterministic MCU restart after engine cranking, eliminating boot failures in harsh automotive environments. |
Use Scenario: Revenue-grade meters requiring tamper-proof power-fail detection during grid outages. IC Role / Device Role / Timing Role: Monitors backup supercapacitor voltage and triggers controlled shutdown/reset when falling below 2.93V. Use Value: Guarantees accurate last-read storage and safe state retention without external supervision circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX811LCS29D3+T | Same 2.93V threshold and 100ms timeout, but rated only to +85°C (vs. +125°C); 5µA ICC vs. 4µA | Limited to commercial/industrial ambient, not extended-temperature automotive or under-hood use | Select when full –40°C to +125°C qualification is unnecessary and cost sensitivity outweighs temperature margin |
| TPS3808G33DBVR | 2.93V threshold with 200ms timeout (not 100ms); 1.4µA ICC; open-drain output (requires pullup) | Longer timeout may delay system boot; open-drain output adds component and layout overhead | Choose only if longer reset duration is required and external pullup is acceptable in the design |
Compared with MAX811LCS29D3+T and TPS3808G33DBVR, the MAX6804US29D3+T delivers tighter temperature range coverage, lower quiescent current, and push/pull output architecture-making it optimal for space-constrained, extended-temperature, and ultra-low-power embedded systems requiring deterministic reset timing without external components.
Availability
MAX6804US29D3+T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6804US29D3+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) is a semiconductor company specializing in analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The MAX6803/MAX6804/MAX6805 family was engineered specifically for low-power, high-reliability microprocessor supervision in space-constrained and thermally demanding applications-emphasizing minimal external components, guaranteed operation down to 0.7V, and factory-trimmed precision thresholds.
FAQ
What is the exact reset threshold voltage of MAX6804US29D3+T and how tightly is it specified?
The MAX6804US29D3+T 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 specification is guaranteed by design and confirmed in the Electrical Characteristics table of the official datasheet, ensuring consistent brownout detection across temperature extremes without calibration.
Does MAX6804US29D3+T require an external pullup resistor on the RESET pin?
No, MAX6804US29D3+T does not require an external pullup resistor because it features a push/pull output stage. The RESET pin actively drives high when deasserted and low when asserted, maintaining valid logic levels across its entire 0.7V–5.5V supply range-unlike open-drain alternatives such as the MAX6805US29D3+T which do require external pullup.
What is the minimum supply voltage at which MAX6804US29D3+T guarantees correct reset output behavior?
MAX6804US29D3+T guarantees correct RESET/RESET output behavior down to VCC = 0.7V across –40°C to +125°C. This is explicitly stated in the datasheet's Absolute Maximum Ratings and Electrical Characteristics sections, enabling reliable operation during deep brownout conditions where many competing supervisors fail to assert or maintain reset.
How is the 100ms reset timeout period implemented in MAX6804US29D3+T?
The 100ms reset timeout period in MAX6804US29D3+T is factory-programmed and internally generated-no external capacitor or resistor is needed. The datasheet specifies tRP = 100ms (min), 150ms (typ), and 200ms (max) after VCC rises above 2.93V or MR is deasserted, ensuring predictable, repeatable reset release timing independent of external component tolerances.
Can MAX6804US29D3+T interface directly with microcontrollers that have bidirectional reset pins?
MAX6804US29D3+T is not recommended for direct interfacing with microcontrollers having bidirectional reset pins (e.g., Motorola 68HC11), because its push/pull output cannot tolerate being driven high by the µC. For such applications, the open-drain MAX6805US29D3+T is preferred-it allows shared reset bus operation with a single external pullup resistor, as documented in the Applications Information section.
MAX6804US29D3+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:
- 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-143-4
MAX6804US29D3+T FAQ
1.How can I place an order for MAX6804US29D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6804US29D3+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 MAX6804US29D3+T reliable?
The price and inventory of MAX6804US29D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6804US29D3+T is usually 5 days.
3.What payment methods are accepted for MAX6804US29D3+T?
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4.How is shipping managed for MAX6804US29D3+T?
MAX6804US29D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6804US29D3+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 MAX6804US29D3+T?
For technical support, including MAX6804US29D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6804US29D3+T requirements.
6.How does Aetrix verify that MAX6804US29D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6804US29D3+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 MAX6804US29D3+T meets industry standards.
7.What is the process for return or replacement of MAX6804US29D3+T?
All MAX6804US29D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6804US29D3+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 MAX6804US29D3+T part is unused and in its original packaging.
Return procedure for MAX6804US29D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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