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Analog Devices Inc./Maxim Integrated MAX6855UK31D2+T
- Part No.:
- MAX6855UK31D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK31D2+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,512
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Product details
Overview
The MAX6855UK31D2+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, providing ultra-low 170nA typical supply current, factory-trimmed 3.075V reset threshold (suffix "31"), and 40ms minimum reset timeout (suffix "D2"). It monitors VCC, asserts an active-high push-pull RESET output on undervoltage or manual reset, and supports portable battery-powered systems requiring guaranteed reset validity down to VCC = +1.1V.
For engineers reviewing the MAX6855UK31D2+T datasheet, MAX6855UK31D2+T pinout, MAX6855UK31D2+T application, or MAX6855UK31D2+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed timing parameters, and validated alternative options for low-power µP reset management in space-constrained designs.
Technical Context
The MAX6855UK31D2+T implements a precision voltage monitor with ±2.5% threshold accuracy over -40°C to +85°C, coupled with a fixed 40ms minimum reset timeout after VCC recovery and MR deassertion. Its active-high push-pull RESET output is referenced to VCC and guarantees VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.38V).
No watchdog timer or CT input is present - the MAX6855UK31D2+T belongs to the MAX6854/MAX6855/MAX6856 family variant with manual reset only, active-high RESET, and no WDI or timeout select functionality. It is functionally distinct from MAX6864–MAX6869 (watchdog) and MAX6861–MAX6863 (CT-selectable timeout) variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V; enables multi-year operation on coin-cell batteries. |
| Reset Threshold Voltage | 3.075V (factory-trimmed, suffix "31"); ±2.5% tolerance ensures reliable brownout detection for 3.3V systems. |
| Reset Timeout Period | 40ms minimum (suffix "D2"); holds RESET high long enough for full µP initialization after power recovery. |
| Operating Voltage Range | 1.2V to 5.5V; supports wide-input battery and low-voltage logic domains. |
| Reset Output Type | Active-high push-pull; eliminates need for external pullup and drives directly into CMOS inputs. |
| Guaranteed Reset Validity | Down to VCC = +1.1V; ensures deterministic reset assertion during deep brownout conditions. |
| VCC to Reset Delay | 40µs maximum; provides fast response to supply collapse without false triggering on transients. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free (indicated by "+T" suffix), footprint-compatible with industry-standard 5-lead SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; transitions high when VCC falls below 3.075V or MR is asserted; remains high for ≥40ms after recovery. |
| 2 | GND | Ground reference for all internal circuitry; 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; <1µs pulse width sufficient to trigger reset. |
| 4 | GND | Second ground terminal; electrically tied to Pin 2 internally; improves noise immunity and thermal dissipation. |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass capacitor to GND for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical enables >10-year battery life in glucose monitors and wearables. |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive, preventing spurious resets in noisy environments. |
| No external components required | Integrated 10kΩ MR pullup, precise voltage reference, and timing capacitor eliminate BOM cost and layout area. |
| Guaranteed operation down to 1.1V | Ensures valid reset assertion even during severe brownout, critical for medical device safety compliance. |
| Push-pull active-high RESET | Directly interfaces with µP reset inputs without level-shifting or pullup resistors, simplifying PCB routing. |
Applications
| Portable Medical Devices | Wearable Health Monitors |
|---|---|
|
Use Scenario: Glucose meters and patient monitors powered by single CR2032 coin cells operating across temperature extremes. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to initialize MCU upon cold start or battery sag. Use Value: 170nA quiescent current extends battery life beyond 3 years; 3.075V threshold matches nominal 3.0V battery discharge curve. |
Use Scenario: ECG patches and pulse oximeters requiring fail-safe reset during motion-induced supply noise. IC Role / Device Role / Timing Role: Voltage monitor and reset generator ensuring deterministic µP restart after mechanical shock-induced VCC dip. Use Value: 40µs VCC-to-reset delay and 40ms timeout guarantee clean boot sequence; 40µs glitch rejection prevents false triggers. |
| Low-Power IoT Sensors | Industrial Handheld Terminals |
|
Use Scenario: Battery-operated environmental sensors transmitting data intermittently via BLE or LoRa. IC Role / Device Role / Timing Role: Nanopower supervisor enabling deep-sleep wake-up integrity and brownout protection during RF transmission surges. Use Value: Operation down to 1.2V allows use with aging batteries; 1.1V reset validity ensures last-chance reset before shutdown. |
Use Scenario: Ruggedized barcode scanners and inventory terminals subjected to ESD and cable discharge events. IC Role / Device Role / Timing Role: Primary reset controller coordinating power-on sequencing and fault recovery in industrial-grade embedded systems. Use Value: Push-pull active-high output drives multiple downstream logic loads; SOT23-5 footprint fits tight mechanical envelopes. |
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 reset threshold, 200ms timeout, open-drain active-low output, 1.6µA supply current. | Requires external pullup; higher ICC reduces battery life; longer timeout may delay system recovery. | Select when open-drain interface or TI ecosystem alignment is required; not drop-in due to output polarity and timing. |
| MAX6315US31D2+T | Same 3.075V threshold and 40ms timeout, but active-low open-drain RESET and 1.2µA ICC. | Lacks push-pull drive; needs pullup resistor; higher current increases power budget in ultra-low-power designs. | Choose only if active-low signaling is mandatory; otherwise MAX6855UK31D2+T offers superior power efficiency and direct drive. |
Compared with TPS3837K33DBVR and MAX6315US31D2+T, the MAX6855UK31D2+T delivers 7× lower supply current and active-high push-pull output - eliminating external components and extending battery life in portable medical and sensor applications where every nanoamp matters.
Availability
MAX6855UK31D2+T is available at Aetrix Electronics and suitable for portable medical devices, wearable health monitors, and low-power IoT sensors requiring stable component supply with guaranteed long-term availability and lead-free compliance.
Supply support for MAX6855UK31D2+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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX6854–MAX6869 family targets ultra-low-power microprocessor supervision in battery-critical systems, emphasizing nanopower operation, small footprint, and robust reset timing under brownout and noise stress.
FAQ
What is the exact reset threshold voltage of the MAX6855UK31D2+T?
The MAX6855UK31D2+T has a factory-trimmed reset threshold voltage of 3.075V, with ±2.5% tolerance over the full -40°C to +85°C operating range. This value is defined by the "31" suffix in the part number and is confirmed in Table 2 (Threshold Suffix Guide) of the official datasheet. The MAX6855UK31D2+T asserts its active-high RESET output whenever VCC falls below this threshold.
Does the MAX6855UK31D2+T include a watchdog timer?
No, the MAX6855UK31D2+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup, which provides only voltage monitoring and manual reset (MR) functionality. Watchdog capability is exclusive to MAX6864–MAX6869 variants (e.g., MAX6864UKxxDxS+T), as clearly indicated in the Selector Guide and Pin Description sections of the datasheet.
What is the reset timeout period for the MAX6855UK31D2+T?
The MAX6855UK31D2+T has a minimum reset timeout period of 40ms, specified by the "D2" suffix. After VCC rises above 3.075V or MR is deasserted, the active-high RESET output remains high for at least 40ms (typical 60ms, max 80ms) to ensure complete microprocessor initialization. This parameter is fixed and not user-configurable.
What package type and lead finish does the MAX6855UK31D2+T use?
The MAX6855UK31D2+T uses a 5-pin SOT23-5 package with lead-free (RoHS-compliant) finish, as indicated by the "+T" suffix per Maxim's ordering convention. The device measures 2.9mm × 1.6mm × 1.1mm and is compatible with standard SOT23 reflow profiles. Pin 2 and Pin 4 are both GND terminals, enhancing thermal and noise performance.
How does the MAX6855UK31D2+T handle supply transients?
The MAX6855UK31D2+T is designed to reject short VCC transients: it typically ignores glitches ≤40µs wide when the overdrive is 100mV above the 3.075V threshold. This immunity is characterized in the "Maximum VCC Transient Duration vs. Reset Threshold Overdrive" graph (Figure MAX684 toc05). The internal architecture avoids false resets during switching noise or ESD-induced supply dips.
MAX6855UK31D2+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:
- 3.075V
- 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
MAX6855UK31D2+T FAQ
1.How can I place an order for MAX6855UK31D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK31D2+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 MAX6855UK31D2+T reliable?
The price and inventory of MAX6855UK31D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK31D2+T is usually 5 days.
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Once your MAX6855UK31D2+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 MAX6855UK31D2+T?
For technical support, including MAX6855UK31D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK31D2+T requirements.
6.How does Aetrix verify that MAX6855UK31D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK31D2+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 MAX6855UK31D2+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK31D2+T?
All MAX6855UK31D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK31D2+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 MAX6855UK31D2+T part is unused and in its original packaging.
Return procedure for MAX6855UK31D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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