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Analog Devices Inc./Maxim Integrated MAX6855UK41D6+T
- Part No.:
- MAX6855UK41D6+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK41D6+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,863
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Product details
Overview
The MAX6855UK41D6+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring active-high push-pull reset output, manual reset input (MR), and factory-trimmed 4.100V reset threshold with 1200ms minimum reset timeout. It monitors VCC supply integrity, asserts reset during brownout or manual trigger, and guarantees valid reset operation down to VCC = +1.1V. It is designed for low-power portable systems requiring reliable power-on reset and system recovery.
For engineers reviewing the MAX6855UK41D6+T datasheet, MAX6855UK41D6+T pinout, MAX6855UK41D6+T application, or MAX6855UK41D6+T equivalent, this page delivers verified electrical parameters, functional pin mapping, real-world use cases in battery-powered medical and consumer devices, and validated alternative options for design flexibility.
Technical Context
The MAX6855UK41D6+T implements a precision voltage monitor with ±2.5% reset threshold accuracy over –40°C to +85°C, coupled with a fixed 1200ms reset timeout timer that holds RESET high after VCC recovers above 4.100V or MR deasserts. Its active-high push-pull output drives directly to VCC without external pullup, and internal 10kΩ MR pullup simplifies manual reset implementation.
No watchdog timer or CT input is present - the MAX6855UK41D6+T belongs to the MAX6854/MAX6855/MAX6856 subset with MR support but no WDI or timeout select functionality. It draws only 170nA typical supply current at VCC = 1.8V, enabling multi-year operation on coin-cell batteries.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.100V (factory-trimmed, ±2.5% tolerance) - sets precise brownout detection point for 4.2V Li-ion or 3.3V/5V rail monitoring |
| Reset Timeout | 600–1200ms (min/ttyp/max) - ensures µP completes full boot sequence before release from reset |
| Supply Current | 170nA typical at 1.8V - enables >10-year battery life in glucose monitors or pagers |
| Operating Voltage Range | 1.2V to 5.5V - supports single-cell Li-ion, NiMH, and regulated 3.3V/5V supplies |
| Reset Output Type | Active-high push-pull - eliminates need for external pullup resistor; drives high to VCC |
| VCC Validity Limit | Reset guaranteed valid down to VCC = +1.1V - ensures deterministic behavior during deep brownout |
| MR Input Logic | Active-low with 10kΩ internal pullup to VCC - allows direct switch-to-GND connection without external components |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint compatible with industry-standard 5-pin supervisory ICs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high during reset assertion; referenced to VCC; no external pullup required |
| 2 | GND | Ground reference - must be connected to system ground plane for stable threshold and timing |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; logic low initiates reset |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity in noisy layouts |
| 5 | VCC | Supply voltage input - monitored for reset generation; bypass with 0.1µF capacitor to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year operation on CR2032 coin cell in always-on medical sensors |
| Guaranteed VCC = +1.1V operation | Ensures deterministic reset behavior during deep undervoltage - critical for fail-safe shutdown in patient monitors |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive - prevents spurious resets in EMI-prone portable environments |
| No external components required | Integrated MR pullup, precision bandgap, and timeout timer eliminate BOM cost and board space for discrete R/C networks |
| Factory-trimmed reset threshold | 4.100V ±2.5% eliminates calibration step and ensures consistent performance across production lots |
Applications
| Portable Glucose Monitor | PDA Power Management |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission powered by single CR2032 cell. IC Role / Device Role / Timing Role: Supervises 3.0V regulated rail; asserts active-high RESET to MSP430FR59xx MCU during startup and brownout. Use Value: 170nA ICC extends battery life beyond 2 years; 4.100V threshold matches Li-ion end-of-discharge profile. |
Use Scenario: Handheld PDA with ARM9 processor, NAND flash, and USB host interface. IC Role / Device Role / Timing Role: Monitors 3.3V core supply; generates 1200ms reset pulse to ensure complete SDRAM initialization before boot code execution. Use Value: Push-pull active-high output interfaces directly to processor's nRESET pin without level-shifting or pullup resistors. |
| Wireless Patient Monitor | MP3 Player System-on-Chip |
Use Scenario: Wearable ECG patch transmitting data to smartphone via BLE; operates 24/7 on rechargeable LiPo. IC Role / Device Role / Timing Role: Detects VCC drop below 4.100V during battery aging or cold-temperature discharge; triggers hard reset of Nordic nRF52832 SoC. Use Value: Valid reset down to VCC = +1.1V prevents latch-up during deep brownout; MR pin enables clinical staff-initiated reboot. |
Use Scenario: Flash-based MP3 player with dual-voltage display driver and audio codec. IC Role / Device Role / Timing Role: Coordinates power sequencing between 1.8V DSP core and 3.3V I/O rails using synchronized reset assertion. Use Value: Fixed 1200ms timeout accommodates slow-starting DC-DC converters; 5-pin SOT23 fits tight PCB area constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | 3.3V reset threshold, 200ms timeout, open-drain output, no MR input | Lacks manual reset and longer timeout; suited for simpler 3.3V-only systems without field service requirements | Select when 3.3V rail supervision suffices and MR is unnecessary; requires external pullup |
| MAX6315US31D3+T | 3.08V threshold, 200ms timeout, active-low open-drain, includes MR and watchdog disable | Lower threshold and shorter timeout; adds watchdog disable pin not present in MAX6855UK41D6+T | Choose for legacy designs needing 3.08V brownout point and watchdog-free operation; same SOT23-5 footprint |
Compared with TPS3837K33DBVR and MAX6315US31D3+T, the MAX6855UK41D6+T provides higher reset threshold (4.100V), longer timeout (1200ms), active-high push-pull output, and integrated MR - making it optimal for Li-ion-powered medical devices requiring robust, long-duration reset hold and field-serviceable reboot capability.
Availability
MAX6855UK41D6+T is available at Aetrix Electronics and suitable for portable glucose monitors, wireless patient monitors, PDAs, and MP3 players requiring stable component supply across extended product lifecycles and low-temperature operating conditions.
Supply support for MAX6855UK41D6+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 analog, mixed-signal, and power-management ICs for industrial, medical, and portable applications.
The MAX6854–MAX6869 family was engineered for ultra-low-power microprocessor supervision in battery-critical systems, emphasizing nanoscale current draw, guaranteed low-VCC operation, and minimal external component count.
FAQ
What is the exact reset threshold voltage of the MAX6855UK41D6+T?
The MAX6855UK41D6+T has a factory-trimmed reset threshold of 4.100V, with ±2.5% tolerance over –40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) where suffix "41" corresponds to 4.100V nominal. The MAX6855UK41D6+T uses this precise threshold to supervise 4.2V Li-ion battery discharge profiles and 3.3V/5V regulator outputs.
Does the MAX6855UK41D6+T include a watchdog timer function?
No, the MAX6855UK41D6+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup, which supports manual reset (MR) and voltage monitoring only. Watchdog functionality is exclusive to MAX6864–MAX6869 variants (e.g., MAX6864UK16D3S). The MAX6855UK41D6+T pinout lacks WDI, confirming absence of watchdog circuitry.
What is the reset timeout period for the MAX6855UK41D6+T?
The MAX6855UK41D6+T features a 1200ms minimum reset timeout period, indicated by suffix "D6" per Table 4. Typical and maximum values are 900ms and 1200ms respectively. This duration ensures reliable µP boot completion in systems with slow-starting peripherals or firmware initialization routines, and is fully characterized across temperature and voltage ranges.
Is the MAX6855UK41D6+T pin-compatible with other SOT23-5 supervisory ICs?
Yes, the MAX6855UK41D6+T uses standard 5-pin SOT23-5 packaging and shares identical pinout with MAX6854/MAX6856 variants: Pin 1 = RESET (active-high push-pull), Pins 2 & 4 = GND, Pin 3 = MR, Pin 5 = VCC. It is explicitly noted as pin-compatible with TPS3836/TPS3837/TPS3838 in the datasheet Features section, enabling drop-in replacement where reset polarity and threshold align.
What is the supply current specification for the MAX6855UK41D6+T at 1.8V?
At VCC = 1.8V and TA = +25°C, the MAX6855UK41D6+T draws 170nA typical supply current (ICC), with a maximum of 370nA. This ultra-low quiescent current is measured with reset deasserted and no load, and is critical for extending battery life in always-on portable equipment - a key parameter validated in the Electrical Characteristics table under "Supply Current".
MAX6855UK41D6+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:
- 4.1V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 600ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK41D6+T FAQ
1.How can I place an order for MAX6855UK41D6+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK41D6+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 MAX6855UK41D6+T reliable?
The price and inventory of MAX6855UK41D6+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK41D6+T is usually 5 days.
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4.How is shipping managed for MAX6855UK41D6+T?
MAX6855UK41D6+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK41D6+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 MAX6855UK41D6+T?
For technical support, including MAX6855UK41D6+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK41D6+T requirements.
6.How does Aetrix verify that MAX6855UK41D6+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK41D6+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 MAX6855UK41D6+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK41D6+T?
All MAX6855UK41D6+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK41D6+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 MAX6855UK41D6+T part is unused and in its original packaging.
Return procedure for MAX6855UK41D6+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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