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Analog Devices Inc./Maxim Integrated MAX6803US26D3+
- Part No.:
- MAX6803US26D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6803US26D3+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,689
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Product details
Overview
The MAX6803US26D3+ from Maxim Integrated is a push/pull, active-high microprocessor supervisory circuit in SOT143 package, monitoring VCC from 2.85V to 5.0V with factory-trimmed 2.63V reset threshold and 100ms minimum reset timeout. It asserts RESET high during power-up, brownout, or manual reset, and guarantees valid output down to VCC = 0.7V. Used in portable equipment and critical µP power monitoring.
For engineers reviewing the MAX6803US26D3+ datasheet, MAX6803US26D3+ pinout, MAX6803US26D3+ application, or MAX6803US26D3+ equivalent, key selection criteria include active-high reset logic, ultra-low 4µA supply current, 2.63V threshold tolerance (±3% over temperature), 100ms timeout stability across -40°C to +125°C, and guaranteed operation at VCC as low as 0.7V.
Technical Context
The MAX6803US26D3+ implements a precision bandgap-based voltage comparator with factory-trimmed 2.63V threshold and ±3% accuracy over -40°C to +125°C. Its internal debounced manual-reset input (MR) accepts logic-low assertion and features 20kΩ internal pullup.
Reset assertion is active-high and push/pull, sourcing up to 800µA at VCC ≥ 4.25V while maintaining VOH ≥ 0.8 × VCC. The device ignores transients <30µs at 10V/ms VCC fall rate and supports reliable reset hold time via fixed 100ms min timeout after VCC recovery or MR release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±3% over -40°C to +125°C - ensures precise brownout detection for 2.85V–5.0V systems |
| Reset Timeout | 100ms minimum - guarantees sufficient processor initialization time after power recovery |
| Supply Current | 4µA typical at VCC = 3.0V - enables multi-year battery life in portable applications |
| Operating VCC Range | 0.7V to 5.5V - supports valid reset assertion even during deep brownout or partial power loss |
| RESET Output Type | Active-high push/pull - eliminates external pullup resistor and simplifies interface to µP reset inputs requiring high-asserted signal |
| MR Input Logic | Active-low with 20kΩ internal pullup - allows direct switch-to-GND connection without external components |
| VCC Transient Immunity | Rejects <30µs negative glitches at 10V/ms - prevents false resets during noisy power events |
Pinout & Package
MAX6803US26D3+ is housed in a 4-pin SOT143 package (U4-1 outline, 21-0052 footprint), measuring 2.9mm × 1.6mm × 1.1mm, suitable for space-constrained PCB layouts.
| 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-high push/pull output; drives high during reset condition and sinks current when deasserted |
| 3 | MR | Manual-reset input; logic-low assertion forces RESET high; internally pulled up to VCC (20kΩ) |
| 4 | VCC | Primary power supply input; monitored for threshold violation; powers internal circuitry and output stage |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 0.7V operating supply | Enables reset assertion integrity during severe brownout-critical for fail-safe shutdown in battery-powered systems |
| Factory-trimmed 2.63V threshold | Eliminates external resistor network and calibration; meets tight tolerance requirements for 2.85V logic rails |
| 100ms minimum reset timeout | Ensures full µP core and peripheral initialization before release-avoids race conditions in complex boot sequences |
| Debounced MR input | Removes need for external RC filter or firmware debounce-reduces BOM count and layout area |
| Push/pull active-high RESET | Simplifies interface to processors with dedicated active-high reset pins (e.g., many ARM Cortex-M variants) |
Applications
| Battery-Powered Portable Devices | Critical µP Power Monitoring |
|---|---|
|
Use Scenario: Wearable health monitors powered by single-cell Li-ion batteries experiencing voltage sag under load. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET during VCC drop below 2.63V to halt unsafe operation and enable controlled shutdown. Use Value: Prevents data corruption and flash write errors by guaranteeing 100ms reset hold time even as battery decays to 2.7V. |
Use Scenario: Industrial PLC controller requiring deterministic boot after AC power interruption. IC Role / Device Role / Timing Role: Primary power-on reset generator with manual override capability via front-panel button. Use Value: Ensures µP remains held in reset until regulated 3.3V rail stabilizes, verified by 2.63V threshold with ±3% tempco. |
| Intelligent Instruments | Controllers |
|
Use Scenario: Handheld multimeter with auto-ranging and EEPROM-backed calibration data. IC Role / Device Role / Timing Role: Brownout detector preventing EEPROM writes during marginal VCC conditions. Use Value: Leverages 4µA quiescent current and 0.7V operation to maintain supervision during sleep mode without draining backup coin cell. |
Use Scenario: HVAC zone controller using low-voltage microcontroller with strict reset timing requirements. IC Role / Device Role / Timing Role: Reset supervisor interfacing directly to µC's active-high reset pin without level-shifting. Use Value: Push/pull output eliminates external pullup, reducing component count and improving noise immunity on reset line. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX811LCS26D3+ | Same 2.63V threshold and 100ms timeout, but active-low open-drain RESET output | Requires external pullup resistor; incompatible with µPs needing active-high reset assertion | Select only if system design already uses active-low reset architecture and board layout accommodates pullup |
| TPS3808G33DBVR | 2.93V threshold (not 2.63V), 200ms timeout, 1.8–6.0V VCC range, 1.6µA ICC | Higher threshold limits use in 2.85V systems; longer timeout may delay boot in time-critical controllers | Prefer for ultra-low-power designs where 2.93V threshold aligns with system rail, not for 2.63V brownout detection |
Compared with MAX811LCS26D3+, the MAX6803US26D3+ provides native active-high drive eliminating pullup dependency; versus TPS3808G33DBVR, it delivers tighter 2.63V threshold matching for 2.85V logic rails and lower minimum VCC operation (0.7V vs 1.8V), enabling robustness in deep brownout scenarios.
Availability
MAX6803US26D3+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical µP/µC power monitoring, intelligent instruments, and industrial controllers requiring stable component supply and long-term lifecycle support.
Supply support for MAX6803US26D3+ 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, mixed-signal, and power management ICs for industrial, computing, and communications applications.
The MAX6803US26D3+ belongs to Maxim's µP supervisory product line, engineered specifically for reliable, low-power reset generation in space- and energy-constrained embedded systems with demanding voltage-monitoring requirements.
FAQ
What is the exact reset threshold voltage of the MAX6803US26D3+ and how stable is it over temperature?
The MAX6803US26D3+ has a factory-trimmed reset threshold of 2.63V at +25°C, with guaranteed tolerance of ±3% across the full operating temperature range of -40°C to +125°C. This stability ensures consistent brownout detection in automotive and industrial environments where ambient temperature swings are extreme. The MAX6803US26D3+ maintains this accuracy without external calibration components.
Does the MAX6803US26D3+ require external components for basic operation?
No, the MAX6803US26D3+ operates autonomously with no external components required. Its internal 20kΩ MR pullup resistor enables direct switch-to-GND connection, and the push/pull active-high RESET output eliminates the need for an external pullup. This integration reduces BOM cost and PCB area-key advantages confirmed in the MAX6803US26D3+ typical operating circuit.
What is the minimum supply voltage at which the MAX6803US26D3+ guarantees valid RESET output?
The MAX6803US26D3+ guarantees correct RESET output state down to VCC = 0.7V, and remains functional up to 5.5V. This ultra-low operating voltage ensures fail-safe reset assertion during deep brownout conditions common in battery-powered systems. The specification is validated across -40°C to +125°C and is explicitly documented for the MAX6803US26D3+ in the Absolute Maximum Ratings table.
How does the 100ms reset timeout of the MAX6803US26D3+ behave across temperature and supply voltage?
The MAX6803US26D3+ provides a minimum 100ms reset timeout, with typical values of 150ms and maximum of 200ms across -40°C to +125°C and full VCC range. This behavior is characterized in the Typical Operating Characteristics graph "Normalized Reset Timeout Period vs. Temperature", confirming stable timing performance without external timing components.
Can the MAX6803US26D3+ interface directly with microcontrollers that have bidirectional reset pins?
No-the MAX6803US26D3+ features an active-high push/pull RESET output, which is incompatible with bidirectional reset pins requiring open-drain or open-collector drive (e.g., Motorola 68HC11). For such interfaces, the MAX6805US26D3+ (open-drain, active-low) is the appropriate variant. The MAX6803US26D3+ is optimized for µPs with dedicated active-high reset inputs.
MAX6803US26D3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6803US26D3+ FAQ
1.How can I place an order for MAX6803US26D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6803US26D3+ 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 MAX6803US26D3+ reliable?
The price and inventory of MAX6803US26D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6803US26D3+ is usually 5 days.
3.What payment methods are accepted for MAX6803US26D3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6803US26D3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6803US26D3+?
MAX6803US26D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6803US26D3+ 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 MAX6803US26D3+?
For technical support, including MAX6803US26D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6803US26D3+ requirements.
6.How does Aetrix verify that MAX6803US26D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6803US26D3+ 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 MAX6803US26D3+ meets industry standards.
7.What is the process for return or replacement of MAX6803US26D3+?
All MAX6803US26D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6803US26D3+, 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 MAX6803US26D3+ part is unused and in its original packaging.
Return procedure for MAX6803US26D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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