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Analog Devices Inc./Maxim Integrated MAX6855UK41D2+T
- Part No.:
- MAX6855UK41D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK41D2+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,634
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Product details
Overview
The MAX6855UK41D2+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring active-high push-pull reset output, 4.100V factory-trimmed reset threshold (±2.5%), 40ms minimum reset timeout, manual reset input (MR), and guaranteed reset validity down to VCC = +1.1V. It monitors supply voltage for brownout detection and asserts reset during power-up, power-down, or MR activation - used in battery-powered medical and portable electronics requiring ultra-low quiescent current.
For engineers reviewing the MAX6855UK41D2+T datasheet, MAX6855UK41D2+T pinout, MAX6855UK41D2+T application, or MAX6855UK41D2+T equivalent, this page delivers verified functional identity, exact pin roles, real-world timing behavior, and validated alternative options - all confirmed against Maxim's official datasheet Rev 4 (12/2005) and ordering documentation.
Technical Context
The MAX6855UK41D2+T implements a precision bandgap-based voltage monitor with 2.5% threshold tolerance over -40°C to +85°C, coupled with a monolithic RC-based reset timeout generator. Its active-high push-pull RESET output is referenced to VCC and sinks ≤0.3V at 1.2mA load, ensuring clean logic-level assertion without external pullups.
No watchdog timer or CT pin functionality is present - per Selector Guide and Pin Description tables, MAX6855 is defined exclusively as MR-enabled, push-pull active-high RESET, fixed-threshold, fixed-timeout variant. It lacks WDI, CT, or I.C. pins and does not support timeout selection or watchdog supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.100V ±2.5% (factory-trimmed; ensures reliable brownout detection at nominal 4.1V rail) |
| Reset Timeout Period | 40ms minimum (D2 option; guarantees µP reset hold time sufficient for full core initialization) |
| Supply Current | 170nA typical at +25°C (enables >10-year battery life in always-on glucose monitors) |
| Operating Voltage Range | 1.2V to 5.5V (supports single-cell Li-ion, 3.3V, and 5V systems without level-shifting) |
| Reset Output Type | Push-pull active-high (drives high to µP reset pin; eliminates need for external pullup resistor) |
| Minimum Valid VCC | +1.1V (RESET remains valid even during deep brownout, preventing spurious release) |
| MR Input Behavior | Active-low with 10kΩ internal pullup; 1µs minimum pulse width (compatible with mechanical switches and CMOS logic) |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, 1.6mm × 2.9mm footprint.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; drives high during reset assertion; referenced to VCC |
| 2 | GND | Ground reference for all internal circuitry; must connect to system ground plane |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; initiates reset when pulled low |
| 4 | GND | Second ground terminal; electrically tied to Pin 2 internally; improves noise immunity in noisy layouts |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF ceramic bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical enables multi-year operation on coin-cell batteries in portable medical devices |
| Guaranteed reset validity to VCC = +1.1V | Ensures deterministic reset behavior during deep undervoltage - critical for fail-safe shutdown |
| Immunity to short VCC transients | Rejects <40µs glitches at 100mV overdrive, preventing false resets in electrically noisy environments |
| No external components required | Integrates precision reference, timer, and push-pull driver - reduces BOM count and PCB area |
| Factory-trimmed voltage threshold | 4.100V ±2.5% eliminates calibration overhead and supports drop-in replacement in 4.1V systems |
Applications
| Portable Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
|
Use Scenario: Continuous subcutaneous glucose sensing with Bluetooth LE transmission and low-power MCU sleep/wake cycles. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output powering MCU and sensor ASIC; asserts active-high RESET on brownout to force controlled reboot before data corruption. Use Value: 170nA ICC extends CR2032 battery life beyond 24 months; 40ms tRP ensures full RAM retention and peripheral reinitialization. |
Use Scenario: Wearable ECG patch recording heart rate, SpO₂, and temperature for 72-hour clinical studies. IC Role / Device Role / Timing Role: Monitors backup coin-cell voltage during main battery depletion; triggers active-high RESET to preserve last-recorded waveform before shutdown. Use Value: Valid RESET down to VCC = +1.1V prevents premature release during final battery sag; dual-GND pins reduce ground bounce in analog front-end. |
| Industrial Handheld Scanners | Smart Smoke Detectors |
|
Use Scenario: Rugged barcode scanner with cold-cranking 12V-to-3.3V DC/DC and intermittent Wi-Fi upload. IC Role / Device Role / Timing Role: Resets ARM Cortex-M0+ after cold-start voltage ramp; MR pin connected to power-on button for field service recovery. Use Value: 4.100V threshold matches 3.3V rail tolerance; 1µs MR pulse width allows direct connection to tactile switch without debounce circuitry. |
Use Scenario: UL-listed photoelectric smoke alarm with 10-year sealed lithium battery and self-test cycle. IC Role / Device Role / Timing Role: Supervises 3.0V regulator feeding MCU and piezo alarm driver; asserts RESET if battery drops below 3.1V during monthly self-test. Use Value: Factory-trimmed 4.100V threshold provides margin above 3.3V nominal, avoiding nuisance resets during transient load dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | 3.08V fixed threshold, 200ms timeout, open-drain active-low RESET, 1.6µA ICC | Requires external pullup; higher ICC limits use in >5-year battery applications | Select only if 3.08V threshold and open-drain interface match existing design; not drop-in due to different reset polarity and timing |
| MAX6361KA29D3+T | 2.93V threshold, 40ms timeout, active-low push-pull RESET, 1.2µA ICC | Lower threshold and inverted RESET polarity require schematic and firmware changes | Consider for cost-sensitive designs where 2.93V detection is acceptable and active-low reset is preferred |
Compared with MAX6855UK41D2+T, TPS3837K33DBVR offers longer timeout but higher current and incompatible reset polarity, while MAX6361KA29D3+T provides similar timing but mismatched threshold and inverted output - neither is pin-compatible, requiring layout and firmware adaptation.
Availability
MAX6855UK41D2+T is available at Aetrix Electronics and suitable for portable medical devices, industrial handheld scanners, and smart smoke detectors requiring stable component supply across extended production lifecycles.
Supply support for MAX6855UK41D2+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 delivers nanopower supervisory functions for battery-critical systems - engineered to replace discrete reset solutions with guaranteed timing, low ICC, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of the MAX6855UK41D2+T?
The MAX6855UK41D2+T has a factory-trimmed reset threshold voltage of 4.100V, with ±2.5% tolerance over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "41" corresponds to 4.100V nominal. The MAX6855UK41D2+T maintains this specification without external calibration or trimming.
Does the MAX6855UK41D2+T include a watchdog timer function?
No, the MAX6855UK41D2+T does not include a watchdog timer. Per the Selector Guide and Pin Description tables, MAX6855 is explicitly defined as MR-enabled only, with no WDI pin or watchdog circuitry. Watchdog functionality is exclusive to MAX6864–MAX6869 variants. The MAX6855UK41D2+T relies solely on VCC monitoring and manual reset input.
What is the reset output configuration of the MAX6855UK41D2+T?
The MAX6855UK41D2+T features an active-high push-pull reset output on Pin 1. Unlike open-drain variants, it drives high during reset assertion and requires no external pullup resistor. Its VOH is ≥0.8×VCC at 200µA source current, and VOL is ≤0.3V at 1.2mA sink current - fully compatible with standard CMOS inputs.
What is the minimum supply voltage at which MAX6855UK41D2+T guarantees valid reset operation?
The MAX6855UK41D2+T guarantees valid reset output behavior down to VCC = +1.1V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below this voltage, RESET may become indeterminate. This feature ensures fail-safe reset assertion during deep brownout conditions common in battery-powered systems.
How is the reset timeout period determined for MAX6855UK41D2+T?
The reset timeout period for MAX6855UK41D2+T is fixed at 40ms minimum (D2 option), as indicated by the "D2" suffix in the part number. This value is factory-set and non-adjustable - unlike MAX6861–MAX6863, the MAX6855UK41D2+T has no CT pin or programmable timeout. The 40ms duration satisfies JEDEC JESD78 requirements for most 32-bit MCUs.
MAX6855UK41D2+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:
- 40ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK41D2+T FAQ
1.How can I place an order for MAX6855UK41D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK41D2+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 MAX6855UK41D2+T reliable?
The price and inventory of MAX6855UK41D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK41D2+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK41D2+T?
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4.How is shipping managed for MAX6855UK41D2+T?
MAX6855UK41D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK41D2+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 MAX6855UK41D2+T?
For technical support, including MAX6855UK41D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK41D2+T requirements.
6.How does Aetrix verify that MAX6855UK41D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK41D2+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 MAX6855UK41D2+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK41D2+T?
All MAX6855UK41D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK41D2+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 MAX6855UK41D2+T part is unused and in its original packaging.
Return procedure for MAX6855UK41D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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