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Analog Devices Inc./Maxim Integrated MAX6855UK31D5+T
- Part No.:
- MAX6855UK31D5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK31D5+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,869
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Product details
Overview
The MAX6855UK31D5+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 a factory-trimmed 3.075V reset threshold (suffix "31"). It asserts reset during VCC brownout, MR assertion, or watchdog timeout, with a guaranteed 450ms minimum reset timeout (suffix "D5") and ultra-low 170nA typical supply current. It is designed for reliable power-on reset and fault recovery in battery-powered medical and portable electronics.
For engineers reviewing the MAX6855UK31D5+T datasheet, MAX6855UK31D5+T pinout, MAX6855UK31D5+T application, or MAX6855UK31D5+T equivalent, this page delivers verified functional identity, confirmed pin roles, exact reset threshold and timeout values, true alternative part comparisons, and real-world use context - all extracted from Maxim's official documentation and validated against device-specific ordering and electrical tables.
Technical Context
The MAX6855UK31D5+T implements a voltage-monitoring comparator with 2.5% threshold accuracy over temperature, coupled to a digital reset timer that holds the active-high RESET output asserted for ≥450ms after VCC rises above 3.075V and MR deasserts. Its MR input features internal 10kΩ pullup and 1µs minimum pulse width support, enabling direct connection to momentary switches without external components.
This variant belongs to the MAX6854–MAX6869 family but excludes watchdog timer (WDI) and CT select functionality - confirmed by its absence in the Selector Guide and Pin Description tables. It supports operation down to VCC = 1.1V with guaranteed RESET validity and exhibits immunity to ≤40µs VCC transients at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.075V (factory-trimmed, ±2.5% tolerance); ensures precise brownout detection for 3.3V systems |
| Reset Timeout Period | 450ms (min); guarantees sufficient hold time for µP initialization and peripheral stabilization |
| Supply Current | 170nA (typ) at +25°C; enables multi-year battery life in glucose monitors and pagers |
| Operating Voltage Range | 1.2V to 5.5V; supports single-cell Li-ion, coin-cell, and multi-rail embedded systems |
| RESET Output Type | Active-high push-pull; eliminates need for external pullup and interfaces directly with µP reset inputs |
| VCC Validity Limit | Guaranteed RESET operation down to VCC = 1.1V; maintains reset integrity during deep brownout |
| MR Input Behavior | Active-low with 10kΩ internal pullup; accepts CMOS logic or open-drain signals; no external bias required |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (indicated by "+T" suffix), footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-high) | Push-pull output driven high during reset assertion; sinks current when low, sources when high; referenced to VCC |
| 2 | GND | Power ground reference for all internal comparators and logic; must be connected to system ground plane |
| 3 | MR (manual reset) | Active-low input; internally pulled up to VCC via 10kΩ; initiates reset when pulled ≤0.3×VCC |
| 4 | GND | Second ground terminal; electrically tied to Pin 2 internally; improves noise immunity in high-frequency environments |
| 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 ICC | 170nA typical supply current enables >10-year battery life in always-on patient monitors |
| No external components | Integrated MR pullup, precision voltage reference, and reset timer eliminate BOM cost and layout area |
| VCC transient immunity | Immune to ≤40µs supply glitches at 100mV overdrive - critical for noisy DC-DC converter outputs |
| Guaranteed reset at low VCC | Valid RESET assertion down to VCC = 1.1V prevents spurious release during deep brownout |
| CMOS-compatible MR interface | Accepts standard logic levels; supports direct connection to FPGA I/O or microcontroller GPIO without level shifters |
Applications
| Portable Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Supervises 3.3V rail from boost converter; asserts active-high RESET on power-up and brownout to ensure ADC and BLE SoC boot reliably. Use Value: 170nA quiescent current extends battery life beyond 2 years; 450ms timeout accommodates slow-starting RF subsystems. |
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 powering analog front-end and flash memory; triggers reset if supply dips below 1.71V during motion-induced battery sag. Use Value: Guaranteed RESET validity to 1.1V prevents premature release during intermittent contact loss; MR pin enables clinician-initiated recalibration. |
| Industrial Handheld Scanners | Smart Smoke Detectors |
Use Scenario: Rugged barcode scanner using single-cell Li-ion with aggressive duty cycling. IC Role / Device Role / Timing Role: Provides power-on reset and brownout protection for ARM Cortex-M0 host MCU and laser driver IC. Use Value: Active-high push-pull RESET eliminates external pullup resistor, reducing component count and PCB area in compact enclosure. |
Use Scenario: Battery-backed photoelectric smoke alarm with self-test and wireless alert capability. IC Role / Device Role / Timing Role: Supervises 3.0V backup rail during AC failure; asserts reset if voltage drops below 3.075V due to aging alkaline cells. Use Value: Factory-trimmed 3.075V threshold matches nominal 3.0V system requirement precisely; D5 timeout ensures full EEPROM write completion before MCU restart. |
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 ICC | Requires external pullup; higher supply current reduces battery life in ultra-low-power designs | Select when legacy open-drain interface or TI ecosystem alignment is required |
| MAX6315US31D3+T | 3.08V threshold, 150ms timeout, active-low push-pull, 1.2µA ICC, same SOT23-5 package | Shorter timeout may not meet bootloader timing requirements; active-low polarity requires schematic revision | Choose only if 150ms is sufficient and active-low reset is acceptable in target design |
Compared with TPS3837K33DBVR and MAX6315US31D3+T, the MAX6855UK31D5+T delivers 7× lower supply current and a longer, more robust 450ms reset hold time - critical for reliable initialization of modern low-voltage MCUs and wireless SoCs in energy-constrained applications.
Availability
MAX6855UK31D5+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, and industrial handheld equipment requiring stable component supply across extended production lifecycles.
Supply support for MAX6855UK31D5+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 product line delivers nanopower supervisory circuits optimized for battery longevity and reliability in portable healthcare, wearables, and remote sensors - with factory-trimmed thresholds and multiple timeout options to eliminate calibration overhead.
FAQ
What is the exact reset threshold voltage of the MAX6855UK31D5+T?
The MAX6855UK31D5+T has a factory-trimmed reset threshold voltage of 3.075V, with ±2.5% tolerance over temperature (−40°C to +85°C). This value is confirmed by Table 2 (Threshold Suffix Guide) where suffix "31" maps to 3.075V (min 2.998V, typ 3.075V, max 3.152V). The MAX6855UK31D5+T uses this precise threshold to protect 3.3V systems against brownout conditions.
Does the MAX6855UK31D5+T include a watchdog timer?
No, the MAX6855UK31D5+T does not include a watchdog timer. Per the Selector Guide and Pin Configurations, only MAX6864–MAX6869 variants feature WDI functionality. The MAX6855UK31D5+T provides voltage monitoring and manual reset only - confirmed by its absence in the WDI-related electrical characteristics and functional diagram sections of the datasheet.
What is the function of Pin 1 and Pin 4 on the MAX6855UK31D5+T?
Pin 1 is the active-high push-pull RESET output, which drives high during reset assertion and low otherwise. Pin 4 is a second GND terminal, internally connected to Pin 2; it enhances noise immunity and thermal dissipation in the 5-pin SOT23 package. Both pins must be connected to the system ground plane - this dual-GND configuration is explicitly shown in the MAX6854/MAX6855/MAX6856 top-view pinout diagram.
What does the "D5" suffix in MAX6855UK31D5+T indicate?
The "D5" suffix specifies a minimum reset timeout period of 450ms (typ 600ms, max 1200ms), per Table 4 (Reset Timeout Periods). This timeout begins when VCC rises above the 3.075V threshold and MR is deasserted, ensuring sufficient hold time for microprocessor initialization, clock stabilization, and peripheral configuration - a critical timing margin for modern low-power MCUs.
Is the MAX6855UK31D5+T pin-compatible with other SOT23-5 supervisory ICs?
The MAX6855UK31D5+T shares the standard 5-pin SOT23 footprint but is not universally pin-compatible. Its Pin 1 = active-high RESET and Pins 2 & 4 = GND differ from common active-low or single-GND variants (e.g., TPS3836). Direct replacement requires verification of reset polarity, GND pin count, and MR connectivity - the MAX6855UK31D5+T pinout must be matched exactly to avoid functional failure.
MAX6855UK31D5+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:
- 300ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK31D5+T FAQ
1.How can I place an order for MAX6855UK31D5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK31D5+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of MAX6855UK31D5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK31D5+T is usually 5 days.
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5.How can I obtain technical support or documentation for MAX6855UK31D5+T?
For technical support, including MAX6855UK31D5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK31D5+T requirements.
6.How does Aetrix verify that MAX6855UK31D5+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK31D5+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 MAX6855UK31D5+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK31D5+T?
All MAX6855UK31D5+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK31D5+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 MAX6855UK31D5+T part is unused and in its original packaging.
Return procedure for MAX6855UK31D5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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