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Analog Devices Inc./Maxim Integrated MAX6802UR31D3+T
- Part No.:
- MAX6802UR31D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6802UR31D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6802UR31D3+T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit in a 3-pin SOT23 package, designed to monitor 3.08V power supplies with ±3% threshold accuracy over -40°C to +125°C and assert reset for ≥100ms after VCC recovery. It draws only 5µA at 5V and operates down to 1.0V supply, supporting brownout detection in battery-powered controllers and portable instrumentation.
For engineers reviewing the MAX6802UR31D3+T datasheet, MAX6802UR31D3+T pinout, MAX6802UR31D3+T application, or MAX6802UR31D3+T equivalent, key selection criteria include its 3.08V factory-trimmed reset threshold, 100ms minimum timeout, open-drain output requiring external pull-up, guaranteed operation to 1.0V VCC, and immunity to sub-30µs VCC transients.
Technical Context
The MAX6802UR31D3+T implements a precision bandgap-based reset comparator with factory-trimmed 3.08V threshold (±1.8% at +25°C, ±3% over full temperature range) and internal timing capacitor for fixed 100ms reset pulse width. Its open-drain RESET output enables wired-OR interfacing with bidirectional microcontroller reset pins.
It features transient immunity via comparator hysteresis and propagation delay filtering, rejecting negative-going VCC glitches ≤30µs at 10V/ms slew rate. The device remains functional and maintains correct RESET state down to VCC = 1.0V, with leakage current <0.5µA when RESET is inactive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±3% over -40°C to +125°C - ensures reliable brownout detection at nominal 3.3V systems |
| Reset Timeout Period | 100ms minimum - guarantees sufficient processor initialization time after power recovery |
| Supply Voltage Range | 1.0V to 5.5V - supports operation during deep brownout and compatibility with 1.2V–5V logic domains |
| Supply Current | 5µA typical at 5V - enables multi-year battery life in always-on monitoring applications |
| RESET Output Type | Open-drain, active-low - allows shared reset bus and interface with bidirectional μP reset pins |
| VOL (RESET asserted) | 0.4V max at 50µA sink - ensures solid logic-low level even at low VCC ≥1.0V |
| Transient Immunity | Rejects VCC glitches ≤30µs at 10V/ms - prevents false resets from switching noise or ESD coupling |
Pinout & Package
Packaged in a RoHS-compliant 3-pin SOT23 (U3-1) with 0.95mm pitch, footprint 21-0051, land pattern 90-0179.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for reset comparator and output stage; must be connected directly to system ground plane |
| 2 | RESET | Open-drain active-low reset output; requires external pull-up resistor (typically 10–100kΩ) to VCC or another logic rail |
| 3 | VCC | Power supply input; monitors this voltage for threshold violation and powers internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.08V threshold | Eliminates external resistor divider and calibration, reducing BOM count and layout area in space-constrained designs |
| 100ms fixed reset timeout | Guarantees adequate processor boot time without requiring external RC timing components |
| 1.0V minimum operating voltage | Enables valid reset assertion during deep undervoltage conditions where competing supervisors fail |
| 4µA–5µA quiescent current | Permits continuous supervision in energy-harvesting and coin-cell-powered devices |
| Open-drain output architecture | Supports wired-OR reset buses and seamless integration with microcontrollers having bidirectional reset pins (e.g., 68HC11) |
Applications
| Industrial Controllers | Portable Medical Instruments |
|---|---|
Use Scenario: PLC I/O modules powered from 3.3V rails subject to intermittent brownouts during field deployment. IC Role / Device Role / Timing Role: Monitors VCC and asserts open-drain RESET to halt firmware execution until stable 3.3V is restored for ≥100ms. Use Value: Prevents corrupted register writes and flash memory corruption during unstable power transitions. | Use Scenario: Handheld glucose meters using single Li-ion cell (2.8–4.2V range) with strict low-power requirements. IC Role / Device Role / Timing Role: Supervises battery voltage and triggers system reset if cell drops below 3.08V, ensuring safe shutdown before data loss. Use Value: Enables deterministic low-voltage cutoff without adding discrete comparators or resistors. |
| Smart Sensor Nodes | Automotive Body Control Modules |
Use Scenario: Wireless environmental sensors operating on energy harvesting sources with variable output voltage. IC Role / Device Role / Timing Role: Provides power-on reset and brownout protection with minimal current draw (<5µA), interfacing via open-drain to MCU reset pin. Use Value: Eliminates need for external pull-up and timing capacitor while maintaining robust glitch immunity. | Use Scenario: Non-safety-critical BCM subsystems (e.g., mirror control) powered from 3.3V LDO with automotive-grade temp range requirement. IC Role / Device Role / Timing Role: Ensures reliable reset assertion across -40°C to +125°C ambient, with 3.08V threshold matching 3.3V rail tolerance. Use Value: Meets AEC-Q100 stress test requirements for supply monitoring without derating or overspecification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6327UT31D3+T | Push-pull active-low RESET; same 3.08V threshold and 100ms timeout; operates down to 0.7V | Requires no external pull-up; not suitable for wired-OR or bidirectional reset bus sharing | Select when board-level simplicity and lowest component count outweigh need for shared reset topology |
| TPS3808G33DBVR | Open-drain active-low RESET; 3.3V threshold (±0.5%); 200ms timeout; 1.4µA ICC; supports enable input | Higher threshold accuracy and lower current, but longer timeout and different pinout (SOT23-6) | Select when tighter threshold tolerance and ultra-low power are critical, and PCB layout allows 6-pin footprint |
Compared with MAX6802UR31D3+T, MAX6327UT31D3+T offers push-pull drive and deeper undervoltage operation but lacks bus-sharing capability, while TPS3808G33DBVR delivers superior accuracy and lower ICC but requires more board area and modifies reset timing behavior.
Availability
MAX6802UR31D3+T is available at Aetrix Electronics and suitable for industrial controllers, portable medical instruments, and smart sensor nodes requiring stable component supply with automotive-grade temperature support and lead-free compliance.
Supply support for MAX6802UR31D3+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 power, sensing, and interface applications in industrial, automotive, and computing markets.
The MAX6800/MAX6801/MAX6802 family delivers ultra-low-power, pin-compatible supervisory circuits for microprocessor reset generation in space- and power-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6802UR31D3+T and how tightly is it specified?
The MAX6802UR31D3+T has a factory-trimmed nominal reset threshold of 3.08V, 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 verified per production test limits, ensuring consistent brownout detection in 3.3V systems without external calibration.
Does MAX6802UR31D3+T require an external pull-up resistor on the RESET pin?
Yes, MAX6802UR31D3+T requires an external pull-up resistor on the RESET pin because it features an open-drain output. A typical value is 10kΩ to 100kΩ connected to the target microcontroller's VCC or logic rail. Without this resistor, the RESET signal cannot be pulled high and will remain indeterminate when deasserted.
What is the minimum supply voltage at which MAX6802UR31D3+T guarantees correct RESET state assertion?
MAX6802UR31D3+T guarantees correct RESET state (i.e., valid active-low assertion and proper comparator function) down to VCC = 1.0V. Below this voltage, operation is not specified. This differs from the MAX6800/MAX6801 variants, which guarantee down to 0.7V.
Can MAX6802UR31D3+T be used with microcontrollers that have bidirectional reset pins?
Yes, MAX6802UR31D3+T is explicitly designed for this use case. Its open-drain RESET output allows direct connection-via a single pull-up resistor-to bidirectional reset pins like those found on Motorola 68HC11-family microcontrollers, enabling either the supervisor or the μC to assert system reset.
What is the maximum duration of a VCC transient that MAX6802UR31D3+T can ignore without issuing a false reset?
At a 10V/ms VCC slew rate, MAX6802UR31D3+T rejects negative-going transients up to 30µs in duration, as confirmed by the Maximum Transient Duration vs. Reset Comparator Overdrive graph in the datasheet. This immunity prevents false resets caused by switching noise or ESD-induced supply dips.
MAX6802UR31D3+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:
- 3.08V
- 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
MAX6802UR31D3+T FAQ
1.How can I place an order for MAX6802UR31D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6802UR31D3+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 MAX6802UR31D3+T reliable?
The price and inventory of MAX6802UR31D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6802UR31D3+T is usually 5 days.
3.What payment methods are accepted for MAX6802UR31D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6802UR31D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6802UR31D3+T?
MAX6802UR31D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6802UR31D3+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 MAX6802UR31D3+T?
For technical support, including MAX6802UR31D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6802UR31D3+T requirements.
6.How does Aetrix verify that MAX6802UR31D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6802UR31D3+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 MAX6802UR31D3+T meets industry standards.
7.What is the process for return or replacement of MAX6802UR31D3+T?
All MAX6802UR31D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6802UR31D3+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 MAX6802UR31D3+T part is unused and in its original packaging.
Return procedure for MAX6802UR31D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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