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Analog Devices Inc./Maxim Integrated MAX6802UR26D3+T
- Part No.:
- MAX6802UR26D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6802UR26D3+T.pdf
- Description:
- IC RESET MPU LOW PWR SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,407
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Product details
Overview
MAX6802UR26D3+T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit designed to monitor 2.63V power supplies in space-constrained embedded systems. It asserts RESET when VCC falls below 2.63V (±1.8% at +25°C), holds it for ≥100ms after VCC recovers, operates down to VCC = 1.0V, draws only 4–12µA supply current, and is housed in a 3-pin SOT23 package for use in battery-powered controllers and critical μP power monitoring.
For engineers reviewing the MAX6802UR26D3+T datasheet, MAX6802UR26D3+T pinout, MAX6802UR26D3+T application, or MAX6802UR26D3+T equivalent, key selection criteria include its 2.63V factory-trimmed reset threshold, 100ms minimum timeout, open-drain output structure requiring external pull-up, guaranteed operation to 1.0V VCC, and immunity to fast VCC transients up to 30µs at 100mV overdrive.
Technical Context
The MAX6802UR26D3+T implements a precision bandgap-based reset comparator with factory-trimmed 2.63V threshold (±3% over –40°C to +125°C) and built-in hysteresis to prevent chatter during brownout recovery. Its open-drain RESET output supports bidirectional μP reset interfaces and requires an external pull-up resistor for logic-level translation.
It features a fixed 100ms minimum reset timeout period (150ms typical, 200ms max), low 4µA ICC at 3.0V, and robust transient immunity-rejecting negative VCC glitches ≤30µs wide when overdriven by ≥100mV. The device remains functional down to VCC = 1.0V, with RESET leakage <0.5µA when deasserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±1.8% at +25°C; ±3% over –40°C to +125°C - ensures reliable brownout detection across industrial temperature range |
| Reset Timeout Period | 100ms (min), 150ms (typ), 200ms (max) - guarantees sufficient hold time for μP initialization and peripheral stabilization |
| Supply Current | 4µA (typ) at VCC = 3.0V; 5µA (typ) at VCC = 5.0V - enables multi-year operation in coin-cell–powered portable equipment |
| VCC Operating Range | 1.0V to 5.5V - supports valid RESET assertion down to 1.0V, enabling early-fail detection before deep brownout |
| RESET Output Type | Open-drain, active-low - allows wired-OR configuration, bidirectional reset arbitration (e.g., with Motorola 68HC11), and flexible voltage-level translation via external pull-up |
| RESET Sink Current | 50µA (max VOL = 0.4V at VCC ≥ 1.0V); 1.2mA (max VOL = 0.3V at VCC ≥ 2.5V) - ensures clean logic-low under light-to-moderate loads |
| Transient Immunity | Rejects VCC glitches ≤30µs wide at 100mV overdrive - prevents spurious resets from switching noise or ESD-induced supply dips |
Pinout & Package
MAX6802UR26D3+T is packaged in a RoHS-compliant 3-pin SOT23 (U3-1) with 1.3mm × 0.8mm footprint and 0.95mm height, optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output stage; must be connected directly to system ground plane for noise immunity |
| 2 (RESET) | Open-drain active-low reset output | Sinks current when asserted; requires external pull-up resistor (typically 10–100kΩ) to define logic-high level and interface voltage |
| 3 (VCC) | Power supply input | Monitored supply rail; powers internal circuitry and defines reset threshold reference; absolute max = +6V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.63V reset threshold | Eliminates need for external resistor divider or calibration; achieves ±1.8% accuracy at +25°C without user adjustment |
| 100ms minimum reset timeout | Ensures μP and peripherals fully initialize before release; meets JEDEC JESD78 reliability requirements for reset duration |
| Open-drain RESET output | Enables direct interfacing with bidirectional μP reset pins (e.g., 68HC11) and supports multiple supervisors sharing one reset bus |
| 1.0V minimum operating VCC | Guarantees correct RESET state during deep brownout, improving system fail-safe behavior before complete power collapse |
| 4µA typical supply current | Reduces quiescent power in always-on monitoring paths, extending battery life in portable instrumentation and IoT edge nodes |
Applications
| Industrial Controllers | Battery-Powered Test Equipment |
|---|---|
|
Use Scenario: PLC I/O modules powered from 3.3V DC-DC converters subject to load-step-induced brownouts. IC Role / Device Role / Timing Role: Monitors 3.3V rail and asserts open-drain RESET to halt firmware execution until stable power resumes. Use Value: Prevents corrupted register writes or flash programming during undervoltage, leveraging 2.63V threshold and 100ms timeout to match controller boot sequence. |
Use Scenario: Handheld multimeter with Li-ion battery discharging from 4.2V to 2.8V, where supply sag triggers false resets. IC Role / Device Role / Timing Role: Supervises main 3.3V LDO output using 2.63V threshold to avoid premature reset during normal discharge. Use Value: Enables reliable operation down to 2.8V battery voltage while rejecting transient sags via 30µs glitch immunity, reducing field failures. |
| Automotive Body Control Modules | Medical Point-of-Care Devices |
|
Use Scenario: BCM microcontroller powered from vehicle battery (9–16V) via 5.0V LDO, exposed to cranking transients and load-dump spikes. IC Role / Device Role / Timing Role: Resets μP during cold-crank brownout (VCC dip to ~6V) using 2.63V threshold referenced to local 5.0V rail. Use Value: Provides deterministic restart after engine start; open-drain output avoids contention with other reset sources in shared reset net. |
Use Scenario: Portable glucose meter with single AAA cell (1.5V → 0.9V), using boost converter to generate 3.3V system rail. IC Role / Device Role / Timing Role: Detects boost converter failure or battery depletion by monitoring 3.3V rail with 2.63V threshold and 100ms timeout. Use Value: Ensures safe shutdown before data loss; 1.0V VCC operation allows final reset assertion even as battery nears end-of-life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT26D3+T | Push-pull active-low RESET; same 2.63V threshold and 100ms timeout; operates down to 0.7V VCC | Requires no pull-up resistor; unsuitable for wired-OR or bidirectional reset buses | Select when board layout prohibits external pull-up or when driving high-capacitance reset lines directly |
| TPS3808G125DBVR | Adjustable threshold (via external resistor); 125ms timeout; 1.5µA ICC; push-pull output; supports watchdog function | Needs external resistor network for 2.63V setting; adds watchdog capability not present in MAX6802UR26D3+T | Select when design requires programmable threshold or dual reset/watchdog functionality in same package |
Compared with MAX6802UR26D3+T, MAX6326UT26D3+T simplifies BOM by eliminating the pull-up resistor but sacrifices bus-sharing flexibility, while TPS3808G125DBVR offers configurability and lower current at the cost of added external components and larger footprint.
Availability
MAX6802UR26D3+T is available at Aetrix Electronics and suitable for industrial controllers, battery-powered test equipment, automotive body control modules, and medical point-of-care devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6802UR26D3+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, mixed-signal, and power-management ICs for industrial, automotive, and computing applications, emphasizing high reliability and integration.
The MAX6800/MAX6801/MAX6802 family delivers ultra-low-power, pin-compatible supervisory circuits for μP reset generation in space- and power-constrained systems, targeting applications where external component count and board area must be minimized.
FAQ
What is the reset threshold voltage of the MAX6802UR26D3+T?
The MAX6802UR26D3+T has a factory-trimmed reset threshold of 2.63V, with tolerance of ±1.8% at +25°C and ±3% over the full –40°C to +125°C operating temperature range. This value is fixed and non-adjustable, ensuring consistent brownout detection without external components. The "26" in the part number explicitly denotes the 2.63V threshold per Maxim's Selector Guide.
Does the MAX6802UR26D3+T require an external pull-up resistor on the RESET pin?
Yes, the MAX6802UR26D3+T features an open-drain RESET output and requires an external pull-up resistor to establish a defined logic-high level. Typical values range from 10kΩ to 100kΩ, connected between the RESET pin and the target logic supply (e.g., 3.3V or 5.0V). Without this resistor, the RESET signal cannot drive high and will remain indeterminate, rendering the device nonfunctional in most systems.
What is the minimum supply voltage at which the MAX6802UR26D3+T guarantees correct RESET operation?
The MAX6802UR26D3+T guarantees correct RESET assertion and deassertion down to VCC = 1.0V, as specified in its Absolute Maximum Ratings and Electrical Characteristics tables. This is higher than the 0.7V limit for MAX6800/MAX6801 variants, reflecting the open-drain output architecture's minimum operating requirement. Below 1.0V, RESET behavior is not guaranteed.
How long does the RESET signal stay active after VCC rises above the 2.63V threshold?
The MAX6802UR26D3+T holds the RESET signal active for a minimum of 100ms after VCC rises above the 2.63V threshold. Typical duration is 150ms, with a maximum of 200ms across temperature and process variation. This fixed timeout is factory-programmed and does not require external timing components, ensuring predictable μP initialization timing.
Can the MAX6802UR26D3+T be used in automotive applications?
Yes, the MAX6802UR26D3+T is rated for operation from –40°C to +125°C and is qualified for automotive body electronics applications such as BCMs and infotainment power supervision. Its 2.63V threshold matches common 3.3V rail monitoring needs, and its open-drain output supports shared reset nets in multi-IC automotive subsystems. It is not AEC-Q100 qualified out-of-box but is widely deployed in automotive-derivative industrial designs.
MAX6802UR26D3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- 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
MAX6802UR26D3+T FAQ
1.How can I place an order for MAX6802UR26D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6802UR26D3+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 MAX6802UR26D3+T reliable?
The price and inventory of MAX6802UR26D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6802UR26D3+T is usually 5 days.
3.What payment methods are accepted for MAX6802UR26D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6802UR26D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6802UR26D3+T?
MAX6802UR26D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6802UR26D3+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 MAX6802UR26D3+T?
For technical support, including MAX6802UR26D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6802UR26D3+T requirements.
6.How does Aetrix verify that MAX6802UR26D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6802UR26D3+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 MAX6802UR26D3+T meets industry standards.
7.What is the process for return or replacement of MAX6802UR26D3+T?
All MAX6802UR26D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6802UR26D3+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 MAX6802UR26D3+T part is unused and in its original packaging.
Return procedure for MAX6802UR26D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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