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Analog Devices Inc./Maxim Integrated MAX6802UR26D3+
- Part No.:
- MAX6802UR26D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6802UR26D3+.pdf
- Description:
- MAX6802 3-PIN, LOW-POWER MICROPR
- Quantity:
- Payment:
- Shipping:
Inventory:12,955
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Product details
Overview
The MAX6802UR26D3+ 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 (±3% over temperature), maintains reset for ≥100ms after VCC recovers, draws only 5µA typical supply current, and operates down to VCC = 1.0V - enabling reliable brownout detection in battery-powered controllers and portable instrumentation.
For engineers reviewing the MAX6802UR26D3+ datasheet, MAX6802UR26D3+ pinout, MAX6802UR26D3+ application, or MAX6802UR26D3+ equivalent, this page delivers verified electrical parameters, SOT23-3 terminal mapping, real-world use cases for critical µP power monitoring, and two confirmed alternative parts with documented functional and timing differences.
Technical Context
This IC implements a precision bandgap-based voltage comparator with factory-trimmed 2.63V threshold (±3% over -40°C to +125°C) and built-in 100ms minimum reset timeout. Its open-drain RESET output requires an external pullup and supports bidirectional reset interfaces - such as those found on Motorola 68HCxx microcontrollers - without contention.
The device features transient immunity up to 100µs for 20mV VCC dips and guarantees valid RESET assertion down to VCC = 1.0V (not 0.7V like MAX6800/MAX6801). Its BiCMOS process enables ultra-low 5µA ICC at +25°C while maintaining full specification across automotive temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±3% over -40°C to +125°C - ensures accurate brownout detection for 2.85V–5.0V systems |
| Reset Timeout Period | ≥100ms after VCC rise - meets JEDEC JESD78 reliability requirements for processor initialization |
| Supply Current (ICC) | 5µA typical at +25°C - enables multi-year operation in coin-cell–powered IoT sensors |
| Operating VCC Range | 1.0V to 5.5V - guarantees correct RESET state during deep brownout, unlike 0.7V devices |
| RESET Output Type | Open-drain active-low - allows wired-OR reset buses and safe interfacing with bidirectional µP reset pins |
| VOL (ISINK = 50µA) | ≤0.4V at VCC ≥1.0V - ensures solid logic-low assertion even under low-supply conditions |
| Reset Propagation Delay | 30µs max at 10V/ms VCC fall rate - rejects fast transients while responding reliably to sustained undervoltage |
Pinout & Package
MAX6802UR26D3+ is housed in a RoHS-compliant 3-pin SOT23 package (outline U3-1, land pattern 90-0179), with 1.3mm × 2.9mm footprint and 0.95mm height - optimized for high-density PCB layouts in portable equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be low-impedance connection to system ground plane |
| 2 | RESET | Open-drain active-low output; requires external pullup resistor (typically 10kΩ–100kΩ) to VCC or another rail |
| 3 | VCC | Power supply input; monitors this rail for undervoltage; powers internal circuitry; decoupling capacitor (0.1µF) required |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.63V with ±3% tolerance over full temperature range - eliminates manual calibration and external resistors |
| Open-drain RESET output | Enables direct interface with bidirectional µP reset pins (e.g., Motorola 68HC11) via single pullup resistor |
| 100ms minimum reset timeout | Guarantees sufficient hold time for complete µP/ASIC initialization before release, even after marginal recovery |
| 1.0V minimum operating VCC | Ensures deterministic reset behavior during deep brownout - no undefined output states below 1.0V |
| Transient immunity | Rejects VCC glitches ≤100µs wide at 20mV amplitude - prevents spurious resets in noisy automotive or industrial environments |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Coin-cell–powered glucose meter with ARM Cortex-M0 MCU requiring guaranteed reset during battery voltage sag. IC Role / Device Role / Timing Role: Power-on and brownout supervisor asserting active-low RESET until stable 3.0V rail is confirmed for ≥100ms. Use Value: 5µA ICC extends battery life beyond 5 years; 1.0V VCC min ensures reset remains valid even as battery discharges to 2.2V. |
Use Scenario: Door module ECU powered from vehicle battery with load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Monitors 5V LDO output for undervoltage events during cranking (VCC dip to 3.2V) and asserts RESET. Use Value: 100µs glitch rejection prevents false resets during 50ms cold-crank transients; -40°C to +125°C rating matches under-hood requirements. |
| Industrial PLC I/O Submodules | Smart Energy Meters |
|
Use Scenario: DIN-rail mounted I/O expander with isolated RS-485 interface and dual-supply (3.3V/5V) architecture. IC Role / Device Role / Timing Role: Supervises primary 3.3V rail; open-drain RESET shared across multiple ASICs via wired-OR bus. Use Value: Open-drain output eliminates contention on shared reset line; SOT23-3 footprint saves >1.5mm² vs. SO-8 alternatives. |
Use Scenario: Revenue-grade electricity meter with metrology SoC requiring tamper-proof power sequencing. IC Role / Device Role / Timing Role: Provides precise 2.63V threshold supervision of backup supercapacitor charging circuit (2.7V nominal). Use Value: ±3% threshold accuracy ensures reset triggers before metrology ADC reference drifts beyond spec limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT26D3+ | Push/pull active-low RESET; 2.63V threshold; 100ms timeout; same SOT23-3 package | Requires no external pullup; not suitable for wired-OR or bidirectional reset buses | Select when board layout lacks space for pullup resistor or µP reset pin is unidirectional input only |
| TPS3808G33DBVR | Push/pull active-low RESET; 3.3V threshold; 200ms timeout; 6-pin SOT23 package | Higher threshold and longer timeout; incompatible pinout; requires PCB redesign | Select when system uses 3.3V main rail and needs extended reset hold time for FPGA configuration |
Compared with MAX6802UR26D3+, MAX6326UT26D3+ offers identical threshold and timing but eliminates the external pullup requirement at the cost of bus-sharing capability; TPS3808G33DBVR provides higher noise margin for 3.3V systems but mandates layout change due to different pin count and assignment.
Availability
MAX6802UR26D3+ is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, and industrial PLC I/O submodules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6802UR26D3+ 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 demanding industrial, automotive, and computing applications - emphasizing low power, high reliability, and small form factor.
The MAX6800/MAX6801/MAX6802 family delivers ultra-low-power, single-function µP supervisors targeting space- and energy-constrained embedded systems where simplicity, guaranteed reset validity, and transient immunity are critical.
FAQ
What is the exact reset threshold voltage of MAX6802UR26D3+ and how tightly is it specified?
The MAX6802UR26D3+ has a factory-trimmed reset threshold of 2.63V, with a guaranteed tolerance of ±3% over the full operating temperature range (-40°C to +125°C). At +25°C, the typical value is 2.63V, and the min/max limits are 2.551V and 2.709V respectively - ensuring consistent brownout detection across environmental extremes without external calibration.
Does MAX6802UR26D3+ require an external pullup resistor, and why?
Yes, MAX6802UR26D3+ requires an external pullup resistor on its open-drain RESET pin because the output cannot actively drive high. A typical value is 10kΩ to 100kΩ connected to the monitored VCC rail or another logic-compatible supply. This configuration enables wired-OR reset buses and safe interfacing with bidirectional microcontroller reset pins - a key design advantage over push/pull alternatives.
What is the minimum VCC voltage at which MAX6802UR26D3+ guarantees correct RESET output state?
MAX6802UR26D3+ guarantees correct RESET output state down to VCC = 1.0V, unlike the MAX6800/MAX6801 variants which guarantee operation to 0.7V. Below 1.0V, the open-drain output's sinking capability degrades, and the device is not recommended for applications requiring valid RESET assertion all the way to 0V - a critical distinction for deep-brownout safety systems.
How does MAX6802UR26D3+ handle fast voltage transients on the VCC line?
MAX6802UR26D3+ rejects fast negative-going VCC transients using internal hysteresis and propagation delay design. For example, it ignores 20mV dips lasting ≤100µs, as shown in the "Maximum Transient Duration vs. Reset Comparator Overdrive" graph. This prevents spurious resets during switching noise or load-dump events while still responding reliably to sustained undervoltage conditions.
Is MAX6802UR26D3+ pin-compatible with other members of the MAX6800 family?
Yes, MAX6802UR26D3+ shares identical 3-pin SOT23 pinout and footprint with MAX6800UR26D3+ and MAX6801UR26D3+. All three have GND on pin 1, RESET on pin 2, and VCC on pin 3. However, output structure differs: MAX6802UR26D3+ uses open-drain, while MAX6800/MAX6801 use push/pull - so direct substitution requires verifying external circuit compatibility (e.g., presence/absence of pullup).
MAX6802UR26D3+ 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:
- -
- Type:
- Power Supply Monitor
- 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+ FAQ
1.How can I place an order for MAX6802UR26D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6802UR26D3+ 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+ reliable?
The price and inventory of MAX6802UR26D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6802UR26D3+ is usually 5 days.
3.What payment methods are accepted for MAX6802UR26D3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6802UR26D3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6802UR26D3+?
MAX6802UR26D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6802UR26D3+ 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+?
For technical support, including MAX6802UR26D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6802UR26D3+ requirements.
6.How does Aetrix verify that MAX6802UR26D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6802UR26D3+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6802UR26D3+?
All MAX6802UR26D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6802UR26D3+, 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+ part is unused and in its original packaging.
Return procedure for MAX6802UR26D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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