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Analog Devices Inc./Maxim Integrated MAX6855UK26D2+T
- Part No.:
- MAX6855UK26D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK26D2+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,952
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Product details
Overview
The MAX6855UK26D2+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, providing voltage monitoring, manual reset input (MR), and fixed reset timeout (1200ms min). It asserts an active-high push-pull RESET output when VCC drops below 2.625V (typ), MR is pulled low, or during power-up/brownout - ensuring reliable µP initialization in ultra-low-power systems.
For engineers reviewing the MAX6855UK26D2+T datasheet, MAX6855UK26D2+T pinout, MAX6855UK26D2+T application, or MAX6855UK26D2+T equivalent, this device is selected for battery-powered medical monitors, portable instrumentation, and energy-harvesting nodes where sub-200nA quiescent current, guaranteed reset validity down to VCC = 1.1V, and immunity to short VCC transients are critical design requirements.
Technical Context
This device implements a precision bandgap-based voltage monitor with ±2.5% threshold accuracy over -40°C to +85°C, coupled with a digital timeout counter that holds RESET asserted for ≥1200ms after VCC rises above VTH and MR deasserts. Its internal 10kΩ MR pullup enables direct switch interfacing without external components.
The active-high push-pull RESET output drives high to VCC (≥0.8×VCC at 500µA source) and low to ≤0.3V (at 1.2mA sink), eliminating need for external pullups. It guarantees valid reset assertion down to VCC = 1.1V, supporting brownout detection in deeply scaled supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V (typ), factory-trimmed ±2.5% - ensures accurate brownout detection at nominal 2.6V system rails |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year operation on coin-cell batteries |
| Reset Timeout | 1200ms (min), D6 option - provides ample time for slow-ramping power supplies or complex boot sequences |
| Operating Voltage | 1.2V to 5.5V - supports single-cell Li-ion, 1.8V/2.5V/3.3V/5V logic domains |
| Reset Output Type | Active-high push-pull - eliminates external pullup resistor and simplifies interface to µP reset inputs |
| VCC Immunity | Valid reset assertion down to VCC = 1.1V - maintains system reliability during deep brownout conditions |
| MR Input | Active-low with 10kΩ internal pullup - allows momentary switch connection directly to GND without external biasing |
Pinout & Package
Package: 5-pin SOT23-5 (2.9mm × 1.6mm × 1.1mm), lead-free, RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high to VCC (≥0.8×VCC) and low to ≤0.3V; directly interfaces µP reset pin |
| 2 | GND | Ground reference - must be connected to system ground plane for stable threshold and noise immunity |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC (10kΩ); assert by pulling to GND |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves thermal and noise performance |
| 5 | VCC | Supply voltage input - monitored for reset generation; bypass with 0.1µF capacitor to GND for noise rejection |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical - extends battery life in glucose monitors and wearable sensors beyond 5 years |
| Guaranteed reset validity | Down to VCC = 1.1V - ensures deterministic reset behavior during severe brownout events |
| No external components required | Integrated MR pullup and precision voltage reference - reduces BOM count and PCB area |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive - prevents spurious resets in noisy automotive or industrial environments |
| Small footprint | 5-pin SOT23 package - fits in space-constrained portable designs such as hearing aids and implantables |
Applications
| Portable Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Supervises 2.6V rail and asserts active-high RESET to MSP430FR59xx MCU during cold-start and low-battery brownout. Use Value: 170nA ICC extends battery life to >3 years; 1200ms tRP accommodates slow analog front-end stabilization before firmware execution. |
Use Scenario: Wearable ECG patch recording heart rate and SpO₂ for 72-hour clinical studies. IC Role / Device Role / Timing Role: Monitors 1.8V LDO output and triggers reset if voltage sags below 2.625V during RF burst transmission. Use Value: Valid reset down to VCC = 1.1V prevents lockup during transient load-induced droop; MR pin enables clinician-initiated recalibration. |
| Energy-Harvesting Sensor Nodes | Low-Power Industrial Data Loggers |
Use Scenario: Solar-powered temperature/humidity node using supercapacitor storage and TI MSP430G2553. IC Role / Device Role / Timing Role: Provides power-on reset and brownout protection for intermittent 2.6V supply generated from harvested energy. Use Value: 1.2V–5.5V operating range matches variable harvester output; no external components reduce leakage paths in ultra-low-IQ design. |
Use Scenario: Ruggedized environmental logger deployed in remote substations with wide-temperature (-40°C to +85°C) operation. IC Role / Device Role / Timing Role: Supervises 3.3V backup rail and asserts RESET during AC mains failure or battery depletion. Use Value: ±2.5% VTH tolerance ensures consistent trip point across temperature; 1200ms timeout allows safe EEPROM write completion before shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | Fixed 3.08V reset threshold; 200ms timeout; open-drain RESET; 1.6µA ICC | Lacks MR input; requires external pullup; higher supply current limits battery life | Select only if 3.08V threshold and open-drain interface match existing layout and power budget permits 10× higher ICC |
| MAX6361KA26D2+T | Same 2.625V threshold and 1200ms timeout; active-low open-drain RESET; 1.2µA ICC | Requires external pullup; incompatible RESET polarity; higher ICC reduces runtime | Choose only when legacy board uses open-drain RESET and polarity inversion is acceptable |
Compared with TPS3836K33DBVR and MAX6361KA26D2+T, the MAX6855UK26D2+T delivers 10× lower supply current and integrated MR functionality in the same SOT23 footprint, making it optimal for new designs prioritizing multi-year battery life and simplified reset control.
Availability
MAX6855UK26D2+T is available at Aetrix Electronics and suitable for portable medical devices, energy-harvesting sensors, and industrial data loggers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX6855UK26D2+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, medical, and communications markets.
The MAX685x family targets ultra-low-power microprocessor supervision in battery-critical systems, emphasizing nanopower operation, robust reset timing, and minimal external component count.
FAQ
What is the exact reset threshold voltage of the MAX6855UK26D2+T?
The MAX6855UK26D2+T has a factory-trimmed reset threshold of 2.625V (typical), with ±2.5% tolerance over -40°C to +85°C. This value corresponds to the "26" suffix in the part number per Maxim's Threshold Suffix Guide (Table 2), and is verified in the Electrical Characteristics table under VTH parameter.
Does the MAX6855UK26D2+T include a watchdog timer function?
No, the MAX6855UK26D2+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 group, which provides voltage monitoring and manual reset only. Watchdog functionality is exclusive to MAX6864–MAX6869 variants, as confirmed in the Selector Guide and Pin Configurations section.
What is the reset timeout period for the MAX6855UK26D2+T?
The MAX6855UK26D2+T features a 1200ms minimum reset timeout period (D6 option), as indicated by the "D2" suffix in the part number. This is validated in Table 4 (Reset Timeout Periods), where D6 specifies 600ms/900ms/1200ms (min/typ/max).
What type of reset output does the MAX6855UK26D2+T provide?
The MAX6855UK26D2+T provides an active-high push-pull reset output, as confirmed in the MAX6855-specific Pin Description (Page 7) and Selector Guide. Pin 1 is labeled RESET (active-high push-pull), distinguishing it from open-drain or active-low variants in the same family.
Can the MAX6855UK26D2+T operate reliably below 1.8V supply?
Yes, the MAX6855UK26D2+T operates from 1.2V to 5.5V and guarantees valid reset assertion down to VCC = 1.1V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Its 170nA typical supply current at 1.8V and functional operation at 1.2V make it suitable for sub-1.8V energy-harvesting systems.
MAX6855UK26D2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.625V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 40ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK26D2+T FAQ
1.How can I place an order for MAX6855UK26D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK26D2+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 MAX6855UK26D2+T reliable?
The price and inventory of MAX6855UK26D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK26D2+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK26D2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK26D2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK26D2+T?
MAX6855UK26D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK26D2+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 MAX6855UK26D2+T?
For technical support, including MAX6855UK26D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK26D2+T requirements.
6.How does Aetrix verify that MAX6855UK26D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK26D2+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 MAX6855UK26D2+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK26D2+T?
All MAX6855UK26D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK26D2+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 MAX6855UK26D2+T part is unused and in its original packaging.
Return procedure for MAX6855UK26D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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