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Analog Devices Inc./Maxim Integrated MAX6802UR44D3+T
- Part No.:
- MAX6802UR44D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6802UR44D3+T.pdf
- Description:
- IC RESET MPU LOW PWR SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,170
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Product details
Overview
MAX6802UR44D3+T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit in a 3-pin SOT23 package, designed to monitor 4.38V power supplies with ±1.8% threshold accuracy at +25°C and ±3% over -40°C to +125°C, asserting reset for ≥100ms after VCC rises above threshold, used in portable equipment and critical μP power monitoring.
For engineers reviewing the MAX6802UR44D3+T datasheet, MAX6802UR44D3+T pinout, MAX6802UR44D3+T application, or MAX6802UR44D3+T equivalent, key selection criteria include guaranteed reset validity down to VCC = 1.0V, 50μA sink capability at RESET, factory-trimmed 4.38V threshold, and compatibility with bidirectional μP reset pins via external pullup.
Technical Context
The MAX6802UR44D3+T implements a precision bandgap-based reset comparator with transient immunity-rejecting negative-going VCC glitches up to 30µs at 100mV overdrive-and guarantees correct output state for VCC ≥ 1.0V, unlike the 0.7V minimum of MAX6800/MAX6801 variants.
Its open-drain RESET output requires an external pullup resistor, enabling wired-OR configuration with microcontrollers like the Motorola 68HC11 that feature bidirectional reset pins, while its 100ms minimum timeout period ensures reliable power-up sequencing in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V (factory-trimmed), ±1.8% at +25°C, ±3% over full temperature range-ensures accurate brownout detection for 4.5V nominal rails |
| Reset Timeout Period | 100ms minimum-guarantees sufficient hold time for μP initialization during slow-rising or noisy power rails |
| Supply Current | 4–12µA across 3.0–5.0V VCC-enables multi-year operation in coin-cell–powered devices |
| Operating Voltage Range | 1.0V to 5.5V-supports valid reset assertion even during deep brownout conditions where VCC drops near 1V |
| RESET Sink Current | 50µA at 0.4V VOL (VCC ≥ 1.0V)-defines minimum pullup resistor value for logic-level compatibility |
| Temperature Range | -40°C to +125°C-qualified for automotive under-hood and industrial embedded environments |
| VCC Propagation Delay | 30µs (VCC falling at 10V/ms)-ensures fast response to rapid supply collapse without false triggering |
Pinout & Package
MAX6802UR44D3+T is housed in a RoHS-compliant 3-pin SOT23 package (outline 21-0051, land pattern 90-0179), with 1.3mm × 0.8mm footprint and 0.95mm height, optimized for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground Reference | Return path for internal comparator and output stage; must be low-impedance connection to system ground plane |
| 2 (RESET) | Open-Drain Active-Low Output | Sinks current when asserted; requires external pullup to VCC or another logic rail; enables shared reset bus with other open-drain devices |
| 3 (VCC) | Supply Input | Monitored voltage source; powers internal circuitry and defines reset threshold reference; absolute max rating is +6V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Trimmed Reset Threshold | 4.38V with ±1.8% tolerance at +25°C eliminates need for external resistor divider or calibration |
| Transient Immunity | Rejects VCC glitches ≤30µs wide at 100mV overdrive-prevents spurious resets during switching noise or ESD events |
| Low-Power Operation | 4µA typical ICC at 3.0V enables integration into always-on subsystems without compromising battery life |
| Guaranteed Functionality Down to 1.0V | Ensures predictable reset behavior during deep brownout, unlike 0.7V-rated competitors which may fail silently |
| Pin-Compatible Supervisory Family | Shares SOT23-3 footprint and pinout with MAX6326/6327/6328 and MAX6346/6347/6348-simplifies second-source qualification |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose monitors and pulse oximeters requiring reliable power-on reset and brownout protection during intermittent charging cycles. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to ARM Cortex-M0+ MCU until regulated 3.3V rail stabilizes above 4.38V for ≥100ms. Use Value: Prevents firmware execution on marginal voltage, eliminating corrupted EEPROM writes and sensor calibration errors during low-battery operation. | Use Scenario: DIN-rail mounted programmable logic controllers with isolated 24V DC input converted to 5V/3.3V rails powering FPGA and communication interfaces. IC Role / Device Role / Timing Role: Primary reset supervisor for main controller ASIC, interfacing via open-drain RESET with bidirectional reset pin on Xilinx Spartan-6 FPGA. Use Value: Enables shared reset bus with fieldbus transceivers using same pullup, reducing component count and board area in compact I/O modules. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: Under-hood BCMs exposed to wide temperature swings (-40°C to +125°C) and load-dump transients on 12V supply rails. IC Role / Device Role / Timing Role: Monitors post-regulator 5V rail derived from automotive-grade DC/DC converter; asserts RESET during cold-crank voltage sag below 4.38V. Use Value: Maintains reset assertion through 100ms sag duration, preventing MCU lockup during engine start and ensuring deterministic recovery. | Use Scenario: ANSI C12.20-certified electricity meters with dual-supply architecture (mains-derived + supercap backup) requiring fail-safe reset coordination. IC Role / Device Role / Timing Role: Supervises 3.3V backup rail generated from supercapacitor, asserting RESET to metering SoC when voltage decays below 4.38V during mains outage. Use Value: Guarantees clean shutdown and nonvolatile memory save before backup power depletion, preserving billing data integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6347UT44D3+T | Same SOT23-3 package, open-drain output, 4.38V threshold, but 1.6µA ICC (vs. 4µA) and -40°C to +85°C temp range | Limited to commercial/industrial ambient; not qualified for extended temperature automotive use | Select when ultra-low quiescent current is prioritized over extended temperature operation |
| TPS3808G33DBVR | 3.3V fixed threshold, push-pull output, 1.5µA ICC, SOT23-5 package (5-pin vs. 3-pin), no factory-trimmed options | Requires different PCB layout; lacks adjustable threshold and open-drain flexibility for shared reset buses | Select only if fixed 3.3V monitoring suffices and board redesign accommodates 5-pin footprint |
Compared with MAX6802UR44D3+T, MAX6347UT44D3+T trades extended temperature support for lower ICC, while TPS3808G33DBVR sacrifices threshold flexibility and pin count efficiency for marginally lower current-neither offers drop-in replacement capability due to differing temperature specs or pinout.
Availability
MAX6802UR44D3+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and automotive body control units requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6802UR44D3+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 industrial, automotive, communications, and computing markets, with emphasis on high-reliability, low-power solutions.
The MAX6800/MAX6801/MAX6802 family delivers cost-effective, space-efficient μP supervisory functions-specifically engineered for applications demanding guaranteed reset validity during deep brownout and compatibility with bidirectional microcontroller reset pins.
FAQ
What is the factory-trimmed reset threshold voltage for MAX6802UR44D3+T?
The MAX6802UR44D3+T has a factory-trimmed reset threshold of 4.38V, specified with ±1.8% tolerance at +25°C and ±3% over the full -40°C to +125°C operating temperature range. This precise threshold enables reliable monitoring of 4.5V nominal power rails without external calibration components, and is confirmed in Table 1 of the official Maxim Integrated datasheet.
Does MAX6802UR44D3+T support operation down to 0V VCC?
No, MAX6802UR44D3+T is guaranteed functional only down to VCC = 1.0V, unlike the MAX6800/MAX6801 variants rated to 0.7V. Below 1.0V, the internal circuitry cannot maintain valid RESET assertion, and the open-drain output may drift due to reduced sink capability-making MAX6802UR44D3+T unsuitable for applications requiring reset validity at near-zero supply voltages.
What is the minimum reset timeout period for MAX6802UR44D3+T?
The MAX6802UR44D3+T provides a minimum reset timeout period of 100ms, as indicated by the "D3" suffix in its part number. This guaranteed minimum ensures sufficient hold time for microprocessor initialization during slow-rising or noisy power-up sequences, and is fully specified over the entire -40°C to +125°C temperature range per the Electrical Characteristics table.
Can MAX6802UR44D3+T interface directly with a microcontroller having a bidirectional reset pin?
Yes, MAX6802UR44D3+T can interface directly with microcontrollers featuring bidirectional reset pins (e.g., Motorola 68HC11) because its open-drain RESET output allows wired-OR configuration with the μP's internal reset driver using a single external pullup resistor. This eliminates contention and enables either device to assert reset, as detailed in the Applications Information section of the datasheet.
What package type and RoHS status does MAX6802UR44D3+T use?
MAX6802UR44D3+T uses a 3-pin SOT23 package (outline 21-0051) with lead-free construction, indicated by the "+T" suffix per Maxim Integrated's ordering convention. The package features a 1.3mm × 0.8mm footprint and 0.95mm height, and complies with RoHS Directive 2011/65/EU, with solder reflow profile rated to +260°C for lead-free assembly.
MAX6802UR44D3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6802UR44D3+T FAQ
1.How can I place an order for MAX6802UR44D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6802UR44D3+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 MAX6802UR44D3+T reliable?
The price and inventory of MAX6802UR44D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6802UR44D3+T is usually 5 days.
3.What payment methods are accepted for MAX6802UR44D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6802UR44D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6802UR44D3+T?
MAX6802UR44D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6802UR44D3+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 MAX6802UR44D3+T?
For technical support, including MAX6802UR44D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6802UR44D3+T requirements.
6.How does Aetrix verify that MAX6802UR44D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6802UR44D3+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 MAX6802UR44D3+T meets industry standards.
7.What is the process for return or replacement of MAX6802UR44D3+T?
All MAX6802UR44D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6802UR44D3+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 MAX6802UR44D3+T part is unused and in its original packaging.
Return procedure for MAX6802UR44D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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