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Analog Devices Inc./Maxim Integrated MAX6800UR31D3+T
- Part No.:
- MAX6800UR31D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6800UR31D3+T.pdf
- Description:
- IC RESET MPU LOW PWR SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,580
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Product details
Overview
MAX6800UR31D3+T from Maxim Integrated is a precision push/pull active-high microprocessor supervisory circuit in SOT23-3 package, monitoring 3.08V supply threshold with 100ms minimum reset timeout, ultra-low 4µA supply current, and guaranteed operation down to 0.7V VCC - used for reliable power-on reset in battery-powered microcontroller systems.
For engineers reviewing the MAX6800UR31D3+T datasheet, MAX6800UR31D3+T pinout, MAX6800UR31D3+T application, or MAX6800UR31D3+T equivalent, key selection criteria include active-high RESET output compatibility with high-impedance µP reset inputs, factory-trimmed 3.08V threshold tolerance (±1.8% at +25°C), 100ms reset pulse width, and SOT23-3 footprint constraints in space-constrained embedded designs.
Technical Context
The MAX6800UR31D3+T implements a precision bandgap-based voltage comparator with factory-trimmed 3.08V reset threshold and hysteresis, asserting active-high RESET while VCC falls below VTH and holding it for ≥100ms after VCC rises above VTH. Its BiCMOS process ensures stable performance across -40°C to +125°C.
It features transient-immune reset detection (rejects <30µs negative VCC glitches at 100mV overdrive), guaranteed RESET validity down to VCC = 0.7V, and no external components required - enabling direct integration into µP reset paths without pull-up resistors or timing capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±1.8% at +25°C; ensures precise brownout detection for 3.3V systems |
| Reset Timeout Period | 100ms minimum; guarantees sufficient µP initialization time after power stabilization |
| Supply Current | 4µA typical at +3.0V; enables multi-year battery life in portable equipment |
| Operating Voltage Range | 0.7V to 5.5V; supports valid RESET assertion during deep brownout recovery |
| Output Type | Push/pull active-high RESET; drives high-impedance µP reset inputs directly, no external pull-up needed |
| Temperature Range | -40°C to +125°C; qualified for automotive and industrial under-hood applications |
| VCC Propagation Delay | 30µs max on VCC fall; provides fast response to supply collapse |
Pinout & Package
MAX6800UR31D3+T is housed in a RoHS-compliant 3-pin SOT23-3 package (outline 21-0051, land pattern 90-0179), with 1.3mm × 2.9mm footprint and 0.95mm height - optimized for high-density 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) | Active-high push/pull reset output | Drives high-impedance µP reset input directly; sources up to 800µA at VCC ≥ 4.25V, sinks 1.2mA at VCC ≥ 3.0V |
| 3 (VCC) | Supply voltage input | Monitored power rail input; accepts 0.7V–5.5V; absolute max rating +6V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.08V with ±1.8% accuracy at +25°C and ±3% over full temperature range - eliminates manual calibration |
| Ultra-low quiescent current | 4µA at +3.0V - reduces standby power in always-on battery systems by >95% vs. discrete solutions |
| Guaranteed reset validity to 0.7V VCC | Ensures deterministic reset behavior during deep brownout recovery, critical for flash-safe µP shutdown |
| Transient immunity | Rejects VCC glitches <30µs wide at 100mV overdrive - prevents spurious resets in noisy power environments |
| No external components | Integrates voltage reference, comparator, timer, and output driver - eliminates BOM cost and layout area for RC networks |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
|
Use Scenario: Power cycling and brownout events in DIN-rail mounted programmable logic controllers operating in factory-floor environments with fluctuating 24VDC supplies. IC Role / Device Role / Timing Role: Active-high reset supervisor ensuring µP reinitialization only after stable 3.3V rail exceeds 3.08V for ≥100ms. Use Value: Prevents firmware corruption during line sags by guaranteeing reset hold time exceeds µP boot ROM execution window. |
Use Scenario: Battery-backed ECG and SpO₂ monitors requiring multi-year shelf life and instant wake-on-power. IC Role / Device Role / Timing Role: Precision 3.08V threshold detector enabling safe startup of ARM Cortex-M0+ MCU from depleted Li-ion cells (2.8V–4.2V range). Use Value: 4µA supply current extends battery runtime beyond 5 years in sleep mode; 0.7V operation ensures reset remains valid until complete power collapse. |
| Automotive Body Control Modules | Smart Energy Meters |
|
Use Scenario: Cold-cranking conditions in 12V automotive systems where battery voltage dips to 6V–8V during engine start. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high RESET during VCC drop below 3.08V and holding for 100ms post-recovery to align with CAN controller initialization. Use Value: -40°C to +125°C qualification and 30µs propagation delay ensure deterministic reset timing despite rapid VCC transients. |
Use Scenario: Revenue-grade electricity meters exposed to wide ambient temperatures and conducted EMI from switching power supplies. IC Role / Device Role / Timing Role: Immune reset generator rejecting sub-30µs supply noise while asserting RESET for ≥100ms to satisfy IEC 62053-21 power-up timing requirements. Use Value: Eliminates need for external RC filter and Schmitt trigger, reducing meter BOM count and improving long-term calibration stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | 2.93V threshold, 100ms timeout, active-low open-drain output | Requires external pull-up resistor; incompatible with active-high reset inputs | Select when interfacing with legacy µPs requiring active-low reset and bidirectional reset pins |
| MAX6326UT29D3+T | 2.93V threshold, 100ms timeout, active-high push/pull output, 1.6µA ICC | Lower supply current but tighter 2.93V threshold - less margin for 3.3V rail tolerance | Prefer for ultra-low-power applications where 2.93V detection suffices and 1.6µA ICC is critical |
Compared with MAX809TRD3+T and MAX6326UT29D3+T, the MAX6800UR31D3+T offers the optimal balance of 3.08V threshold margin for 3.3V systems, guaranteed 0.7V operation, and push/pull drive strength - making it ideal for new designs prioritizing robustness over minimal current draw.
Availability
MAX6800UR31D3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for MAX6800UR31D3+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, with emphasis on reliability and integration for harsh-environment systems.
The MAX6800 family delivers single-chip µP reset supervision with factory-trimmed thresholds and fixed timeouts - engineered for cost-sensitive, space-constrained embedded systems demanding deterministic power-on sequencing.
FAQ
What is the exact reset threshold voltage of MAX6800UR31D3+T and how tightly is it specified?
The MAX6800UR31D3+T has a factory-trimmed nominal reset threshold of 3.08V, specified as ±1.8% at +25°C and ±3% over the full -40°C to +125°C operating range. This precision eliminates the need for external resistor dividers and ensures consistent brownout detection across temperature extremes in the MAX6800UR31D3+T.
Does MAX6800UR31D3+T require an external pull-up resistor on its RESET pin?
No. The MAX6800UR31D3+T features a push/pull active-high RESET output capable of sourcing up to 800µA and sinking 1.2mA, allowing direct connection to high-impedance µP reset inputs without external biasing. This simplifies layout and improves reliability compared to open-drain alternatives like the MAX6802UR31D3+T.
What is the minimum supply voltage at which MAX6800UR31D3+T guarantees correct RESET assertion?
The MAX6800UR31D3+T guarantees correct RESET assertion and deassertion down to VCC = 0.7V, verified across -40°C to +125°C. This ensures deterministic behavior during deep brownout recovery - a critical requirement for flash-safe µP shutdown sequences in the MAX6800UR31D3+T.
How does MAX6800UR31D3+T handle short-duration power supply transients?
The MAX6800UR31D3+T's reset comparator rejects negative-going VCC transients shorter than 30µs at 100mV overdrive, per the Maximum Transient Duration vs. Reset Comparator Overdrive graph in the datasheet. This immunity prevents spurious resets in electrically noisy environments such as automotive or industrial settings using the MAX6800UR31D3+T.
Is MAX6800UR31D3+T pin-compatible with other members of the MAX6800 family?
Yes - all MAX6800/MAX6801/MAX6802 variants share identical SOT23-3 pinout (GND, RESET, VCC) and footprint. The MAX6800UR31D3+T can be substituted for other URxxD3+T parts without PCB changes, though output polarity (active-high vs. active-low) and threshold must be verified for functional compatibility.
MAX6800UR31D3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- 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-23-3
MAX6800UR31D3+T FAQ
1.How can I place an order for MAX6800UR31D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6800UR31D3+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 MAX6800UR31D3+T reliable?
The price and inventory of MAX6800UR31D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6800UR31D3+T is usually 5 days.
3.What payment methods are accepted for MAX6800UR31D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6800UR31D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6800UR31D3+T?
MAX6800UR31D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6800UR31D3+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 MAX6800UR31D3+T?
For technical support, including MAX6800UR31D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6800UR31D3+T requirements.
6.How does Aetrix verify that MAX6800UR31D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6800UR31D3+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 MAX6800UR31D3+T meets industry standards.
7.What is the process for return or replacement of MAX6800UR31D3+T?
All MAX6800UR31D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6800UR31D3+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 MAX6800UR31D3+T part is unused and in its original packaging.
Return procedure for MAX6800UR31D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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