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Analog Devices Inc./Maxim Integrated MAX6808UR26+T
- Part No.:
- MAX6808UR26+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6808UR26+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,967
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Product details
Overview
MAX6808UR26+T from Maxim Integrated is a precision voltage detector IC designed for power-supply monitoring in microprocessor-based systems. It features a factory-preset 2.6V ±2% reset threshold, active-low open-drain RESET output, and guaranteed operation down to VCC = 1.0V - enabling reliable brownout detection in battery-powered embedded controllers and portable instrumentation.
For engineers reviewing the MAX6808UR26+T datasheet, MAX6808UR26+T pinout, MAX6808UR26+T application, or MAX6808UR26+T equivalent, this device is selected for low-quiescent-current (35µA), hysteresis-stabilized reset assertion in space-constrained SOT23-3 designs requiring manual-reset compatibility, transient immunity, and multi-rail reset line interfacing.
Technical Context
The MAX6808UR26+T implements a precision bandgap-based voltage comparator with internal hysteresis (VHYST = 0.02–0.03 × VTH−) to prevent output chatter near the 2.6V threshold during supply ramp-up/down. Its open-drain RESET output supports flexible pull-up to any rail ≤6V, enabling shared reset bus architectures across mixed-voltage systems.
It operates over −40°C to +85°C with supply current stable across temperature (35µA typ. at VCC = 3.6V) and exhibits immunity to negative-going VCC transients up to 100µs duration when overdrive is ≤100mV - critical for noisy industrial power rails and battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.60V ±2% (VTH−), factory-trimmed - ensures accurate power-fail detection before downstream logic enters undervoltage lockout. |
| Supply Current | 35µA typical at VCC = 3.6V - enables multi-year battery life in always-on portable equipment. |
| RESET Output Type | Active-low, open-drain - allows wired-OR reset buses and interface with bidirectional µP reset pins (e.g., Motorola 68HC11). |
| VCC Operating Range | 1.0V to 5.5V - guarantees valid RESET assertion even during deep brownout or ultra-low-power sleep states. |
| Hysteresis | 0.02–0.03 × VTH− - eliminates oscillation during slow-ramping supplies or noisy 2.6V rails. |
| Output Leakage | 1µA max (IOH, RESET deasserted) - minimizes pull-up resistor power loss in high-impedance reset networks. |
| Tempco | 30ppm/°C - maintains threshold stability across industrial temperature range without external calibration. |
Pinout & Package
MAX6808UR26+T is housed in a RoHS-compliant 3-pin SOT23 package (U3-1 outline), optimized for high-density PCB layouts and tape-and-reel automated assembly (2500-piece minimum order).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset signal output; requires external pull-up; sinks current when VCC < 2.6V. |
| 2 | GND | Analog ground reference for internal comparator and bandgap circuitry. |
| 3 | VCC | Power supply input (1.0V–5.5V); also serves as monitored rail for reset generation. |
Key Features
| Feature | Design Value |
|---|---|
| ±2% threshold accuracy | Guarantees reset assertion before system ICs drop below minimum operating voltage (e.g., 2.5V ±10% logic), eliminating need for external trimming. |
| Open-drain RESET | Enables direct connection to multi-supply reset buses (e.g., 3.3V and 5V domains sharing one line) without level-shifting. |
| 1.0V VCC operation | Ensures deterministic reset behavior during deep discharge of Li-ion or coin-cell batteries, preventing undefined µP states. |
| 35µA quiescent current | Reduces standby power by >90% versus discrete resistor-zener reset solutions, extending battery runtime in portable scanners. |
| Transient immunity | Rejects VCC glitches ≤100µs wide and ≤100mV undershoot - avoids spurious resets in electrically noisy environments. |
Applications
| Portable/Battery-Powered Equipment | Bar-Code Scanners |
|---|---|
Use Scenario: Handheld scanner powered by single-cell Li-ion (2.7–4.2V) with intermittent wake/sleep cycles. IC Role / Device Role / Timing Role: Voltage detector asserting reset if cell voltage drops below 2.6V during discharge, preventing corrupted decode operations. Use Value: Prevents firmware crash and memory corruption by ensuring µP only runs within validated supply range - no external components required. |
Use Scenario: Industrial barcode reader with ESD-prone data lines and switching power supply. IC Role / Device Role / Timing Role: Monitors 3.3V logic rail; open-drain RESET interfaces directly to bidirectional µP reset I/O without contention. Use Value: Eliminates risk of bus contention during power sequencing, while 30ppm/°C tempco maintains accuracy across warehouse temperature swings. |
| Critical µP and µC Power Monitoring | Intelligent Instruments |
Use Scenario: Medical sensor node with ARM Cortex-M0+ MCU and flash memory. IC Role / Device Role / Timing Role: Provides clean, hysteresis-stabilized reset during cold-start and brownout, with RESET valid down to 1.0V. Use Value: Guarantees safe boot sequence and prevents flash write corruption during marginal supply conditions. |
Use Scenario: Portable multimeter with dual-rail analog front-end (±2.5V) and 3.3V digital core. IC Role / Device Role / Timing Role: Monitors 3.3V digital supply; open-drain output pulled to 3.3V, enabling shared reset with analog supervisor. Use Value: Reduces BOM count by replacing discrete reset IC + pull-up resistor, saving 1.5mm² PCB area in compact enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6806UR26+T | Active-low push-pull RESET (not open-drain); no external pull-up required. | Suitable where dedicated reset line exists and bidirectional µP interfaces are absent. | Select when board layout lacks space for pull-up resistor or when driving heavy capacitive loads directly. |
| TLV803EB26DBZR | 2.63V threshold (±0.5%), 1.8–6V VCC range, 350nA IQ, SOT23-3. | Better suited for ultra-low-power IoT sensors; lacks transient immunity specs and hysteresis documentation. | Prefer for energy-harvesting or coin-cell devices where sub-1µA quiescent current is mandatory. |
Compared with MAX6806UR26+T and TLV803EB26DBZR, the MAX6808UR26+T uniquely balances industrial-grade transient rejection, guaranteed 1.0V operation, and open-drain flexibility - making it optimal for mixed-voltage, noise-prone embedded systems where reset bus sharing and brownout resilience are design-critical.
Availability
MAX6808UR26+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, bar-code scanners, and critical µP power monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6808UR26+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, computing, and communications markets.
The MAX6806/MAX6807/MAX6808 family was engineered to replace discrete reset circuits in space- and power-constrained digital systems - delivering precision voltage monitoring with zero external components and guaranteed performance across temperature and supply variations.
FAQ
What is the exact reset threshold voltage of the MAX6808UR26+T?
The MAX6808UR26+T has a factory-trimmed nominal reset threshold of 2.60V with ±2% accuracy (2.548V to 2.652V at +25°C). This value is specified as VTH− (falling VCC) and includes built-in hysteresis to prevent chatter during supply transitions. The threshold remains stable across temperature with a tempco of 30ppm/°C.
Does the MAX6808UR26+T require an external pull-up resistor on the RESET pin?
Yes - the MAX6808UR26+T features an active-low open-drain RESET output, which requires an external pull-up resistor to a valid supply rail (≤6V). A 100kΩ resistor is typically sufficient for high-impedance loads; lower values (e.g., 10kΩ) may be used for faster rise times or heavier capacitive loads, provided sink current remains within 20µA specification.
Can the MAX6808UR26+T operate reliably below 1.8V supply voltage?
Yes - the MAX6808UR26+T is fully specified down to VCC = 1.0V, with RESET guaranteed to remain asserted (low) until VCC rises above the 2.6V threshold. Its 35µA supply current and stable operation at 1.0V make it suitable for deep-brownout protection in Li-ion, NiMH, and coin-cell applications where other supervisors fail.
How does the MAX6808UR26+T handle power-supply transients?
The MAX6808UR26+T is immune to short-duration negative-going VCC transients: it will not assert spurious resets for pulses ≤100µs wide when undershoot is ≤100mV below the 2.6V threshold. This robustness is achieved via internal filtering and comparator design - confirmed in Figure 3 of the datasheet - and is critical for noisy switch-mode power supplies and motor-driven systems.
Is the MAX6808UR26+T pin-compatible with other members of the MAX6806/MAX6807/MAX6808 family in SOT23-3?
Yes - all MAX6806URxx, MAX6807URxx, and MAX6808URxx variants in the 3-pin SOT23 package share identical pinout (Pin 1 = RESET, Pin 2 = GND, Pin 3 = VCC). However, RESET functionality differs: MAX6806UR26+T uses push-pull active-low, MAX6807UR26+T uses push-pull active-high, and MAX6808UR26+T uses open-drain active-low - requiring schematic review before substitution.
MAX6808UR26+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:
- 4.6V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 30µs Typical
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6808UR26+T FAQ
1.How can I place an order for MAX6808UR26+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6808UR26+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 MAX6808UR26+T reliable?
The price and inventory of MAX6808UR26+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6808UR26+T is usually 5 days.
3.What payment methods are accepted for MAX6808UR26+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6808UR26+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6808UR26+T?
MAX6808UR26+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6808UR26+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 MAX6808UR26+T?
For technical support, including MAX6808UR26+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6808UR26+T requirements.
6.How does Aetrix verify that MAX6808UR26+T is sourced from the original manufacturer or authorized distributors?
All MAX6808UR26+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 MAX6808UR26+T meets industry standards.
7.What is the process for return or replacement of MAX6808UR26+T?
All MAX6808UR26+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6808UR26+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 MAX6808UR26+T part is unused and in its original packaging.
Return procedure for MAX6808UR26+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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