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Analog Devices Inc./Maxim Integrated MAX6855UK20D3+T
- Part No.:
- MAX6855UK20D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK20D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,804
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Product details
Overview
The MAX6855UK20D3+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.0V reset threshold (±2.5%), and 150ms minimum reset timeout period. It provides active-high push-pull RESET output, manual reset input (MR), and operates across -40°C to +85°C for reliable power-up/brownout monitoring in battery-powered systems.
For engineers reviewing the MAX6855UK20D3+T datasheet, MAX6855UK20D3+T pinout, MAX6855UK20D3+T application, or MAX6855UK20D3+T equivalent, this device is selected for low-power embedded systems requiring guaranteed reset validity down to VCC = 1.1V, immunity to short VCC transients, and no external components.
Technical Context
This IC integrates voltage monitoring, manual reset assertion, and reset timing control - but excludes watchdog timer functionality (not present in MAX6855 series). Its internal 10kΩ MR pullup enables direct switch interfacing without external biasing, and the push-pull active-high RESET output drives µP reset inputs directly without pullup resistors.
The device uses a precision bandgap reference and comparator architecture to maintain ±2.5% reset threshold accuracy over temperature, with reset deassertion delayed by a fixed 150ms (min) after VCC exceeds VTH and MR is released - ensuring stable power rail establishment before processor release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at +25°C - enables multi-year operation on coin-cell batteries in always-on monitoring applications. |
| Reset Threshold Voltage | 2.0V ±2.5% - factory-trimmed to monitor 2.0V logic rails or core supplies with guaranteed accuracy over -40°C to +85°C. |
| Reset Timeout Period | 150ms minimum - holds processor in reset long enough for power rails and clocks to stabilize post-brownout. |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup resistor and ensures clean, rail-to-rail logic-level signaling. |
| VCC Validity Range | Guaranteed RESET operation down to VCC = 1.1V - supports reset assertion during deep brownout conditions before system collapse. |
| MR Input Logic | Active-low with 10kΩ internal pullup to VCC - allows direct connection of momentary switch to GND; no debounce required. |
| Package | 5-pin SOT23 - footprint-compatible with industry-standard supervisory ICs and suitable for space-constrained portable PCBs. |
Pinout & Package
Package: 5-pin SOT23 (lead-free, RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output; asserts high during reset condition and deasserts low when VCC > VTH + hysteresis and MR is released. |
| 2, 4 | GND | Ground reference for all internal circuitry; must be connected to system ground plane with low-impedance path. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; logic low (≤0.3×VCC) initiates reset sequence. |
| 5 | VCC | Supply voltage input (1.2V–5.5V); monitored for reset generation; requires 0.1µF bypass capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical enables >10-year battery life in glucose monitors and wearable health sensors. |
| No external components required | Integrated MR pullup, precision threshold, and timing eliminate BOM cost and layout area for discrete RC networks. |
| Immunity to short VCC transients | Rejects ≤40µs transients at 100mV overdrive - prevents false resets in electrically noisy industrial handhelds. |
| Guaranteed reset validity to 1.1V | Ensures deterministic reset behavior during deep undervoltage events where most µPs fail to operate. |
| SOT23-5 footprint compatibility | Direct replacement for TPS3837-series and other 5-pin supervisory ICs without PCB redesign. |
Applications
| Portable Medical Devices | Battery-Powered IoT Sensors |
|---|---|
Use Scenario: Glucose meters and patient monitors operating from single CR2032 coin cells with intermittent usage over multi-year service life. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to ARM Cortex-M0+ MCU during power-up and brownout, holding reset for ≥150ms until regulated 3.3V rail stabilizes. Use Value: 170nA quiescent current extends battery life beyond 5 years; 2.0V threshold matches LiMnO₂ cell end-of-life voltage for graceful shutdown. |
Use Scenario: Wireless environmental sensor nodes deployed in remote locations, powered by primary lithium AA cells. IC Role / Device Role / Timing Role: Voltage supervisor monitoring 2.0V LDO output feeding BLE SoC; triggers reset if battery sags below safe operating voltage during RF transmission bursts. Use Value: Guaranteed reset down to VCC = 1.1V prevents firmware corruption during final battery discharge phase; SOT23-5 footprint minimizes PCB area in compact modules. |
| Industrial Handheld Terminals | Wearable Consumer Electronics |
Use Scenario: Ruggedized barcode scanners subjected to ESD and power rail noise in warehouse environments. IC Role / Device Role / Timing Role: Brownout detector providing active-high RESET to application processor; rejects sub-50µs VCC glitches induced by motor switching or relay bounce. Use Value: Transient immunity eliminates spurious resets during field use; MR pin enables hardware-initiated recovery via front-panel button without firmware involvement. |
Use Scenario: Fitness trackers with OLED display and motion sensor, powered by rechargeable LiPo cells with tight voltage envelope. IC Role / Device Role / Timing Role: Power supervisor asserting RESET to microcontroller when battery voltage drops below 2.0V during deep discharge, preventing data loss in flash memory writes. Use Value: Factory-trimmed 2.0V threshold aligns precisely with LiPo cutoff voltage; 150ms timeout ensures display controller completes frame buffer flush before reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K20DBVR | 2.0V threshold, 200ms reset timeout, open-drain active-low RESET, 1.6µA ICC | Requires external pullup resistor; higher supply current reduces battery life in ultra-low-power designs | Select MAX6855UK20D3+T when active-high push-pull output and nanopower operation are mandatory. |
| MAX6315US20D3+ | 2.0V threshold, 150ms timeout, active-low open-drain RESET, 1.2µA ICC, same SOT23-5 package | Active-low output incompatible with µPs requiring active-high reset; higher ICC increases leakage in sleep mode | Choose MAX6855UK20D3+T for active-high interface and 14× lower supply current in always-on monitoring. |
Compared with TPS3837K20DBVR and MAX6315US20D3+, the MAX6855UK20D3+T delivers superior energy efficiency and simplified interface design - its 170nA ICC and push-pull active-high RESET reduce component count and extend battery runtime in medical and sensor applications where every nanoamp matters.
Availability
MAX6855UK20D3+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, industrial handheld terminals, and wearable consumer electronics requiring stable component supply and long-term lifecycle support.
Supply support for MAX6855UK20D3+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 management, sensing, and interface applications in industrial, medical, and communications markets.
The MAX6855UK20D3+T belongs to the MAX68xx nanopower supervisory family, engineered specifically for ultra-low-power embedded systems where extended battery life and robust brownout protection are critical design requirements.
FAQ
What is the reset threshold voltage of the MAX6855UK20D3+T?
The MAX6855UK20D3+T has a factory-trimmed reset threshold voltage of 2.0V with ±2.5% tolerance over the full -40°C to +85°C operating temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "20" corresponds to 2.0V nominal VTH. The MAX6855UK20D3+T maintains this accuracy without external calibration or trimming components.
Does the MAX6855UK20D3+T include a watchdog timer function?
No, the MAX6855UK20D3+T does not include a watchdog timer. It is part of the MAX6854/MAX6855/MAX6856 subgroup, which provides only voltage monitoring and manual reset functionality. Watchdog capability is exclusive to MAX6864–MAX6869 variants (e.g., MAX6864UK20D3S+T), as clearly indicated in the Selector Guide and Pin Description sections of the datasheet.
What is the reset timeout period for the MAX6855UK20D3+T?
The MAX6855UK20D3+T has a minimum reset timeout period of 150ms, corresponding to the "D3" suffix in its part number. This is verified in Table 4 (Reset Timeout Periods), where D3 specifies 150ms (min) / 225ms (typ) / 300ms (max). The timeout begins after VCC rises above the 2.0V threshold and MR is deasserted, ensuring sufficient stabilization time before processor release.
What type of RESET output does the MAX6855UK20D3+T provide?
The MAX6855UK20D3+T provides an active-high push-pull RESET output, as confirmed in the MAX6855-specific Pin Description table (page 7) and Selector Guide. Pin 1 delivers a rail-to-rail logic-high signal during reset assertion and logic-low when deasserted - eliminating the need for external pullup resistors and simplifying interface with µPs requiring active-high reset inputs.
Is the MAX6855UK20D3+T compatible with the TPS3837 series?
Yes, the MAX6855UK20D3+T is pin-compatible with the TPS3837K20DBVR in the SOT23-5 package and shares identical pin functions (VCC, GND, MR, RESET, GND), as noted in the Features section. However, it differs in output polarity (active-high vs. active-low) and supply current (170nA vs. 1.6µA), making it a functional upgrade for low-power designs requiring the same footprint.
MAX6855UK20D3+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:
- 2V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK20D3+T FAQ
1.How can I place an order for MAX6855UK20D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK20D3+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 MAX6855UK20D3+T reliable?
The price and inventory of MAX6855UK20D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK20D3+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK20D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK20D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK20D3+T?
MAX6855UK20D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK20D3+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 MAX6855UK20D3+T?
For technical support, including MAX6855UK20D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK20D3+T requirements.
6.How does Aetrix verify that MAX6855UK20D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK20D3+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 MAX6855UK20D3+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK20D3+T?
All MAX6855UK20D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK20D3+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 MAX6855UK20D3+T part is unused and in its original packaging.
Return procedure for MAX6855UK20D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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