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Analog Devices Inc./Maxim Integrated MAX6855UK29D2+T
- Part No.:
- MAX6855UK29D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK29D2+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,811
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Product details
Overview
The MAX6855UK29D2+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, a factory-trimmed 2.925V reset threshold (suffix "29"), and a 40ms minimum reset timeout period (suffix "D2"). 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-critical systems.
For engineers reviewing the MAX6855UK29D2+T datasheet, MAX6855UK29D2+T pinout, MAX6855UK29D2+T application, or MAX6855UK29D2+T equivalent, this device serves as a precision voltage monitor with deterministic reset timing, manual reset initiation, and guaranteed reset validity down to VCC = +1.1V - key for portable medical and handheld electronics where supply stability and low quiescent power are non-negotiable.
Technical Context
The MAX6855UK29D2+T implements a precision bandgap-based voltage reference and comparator to detect VCC falling below its 2.925V ±2.5% threshold, triggering an active-high push-pull RESET assertion. Its internal timer enforces a minimum 40ms (typ. 60ms) reset pulse width after VCC recovery and MR deassertion.
It includes a 10kΩ internal pullup on the MR pin, accepts CMOS-compatible logic levels, rejects <200ns glitches, and guarantees functional operation with VCC as low as 1.1V - enabling robust reset behavior during deep brownouts without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.925V ±2.5% - precisely monitors 3.0V rail brownout with margin for tolerance and temperature drift |
| Supply Current (typ) | 170nA at VCC = 1.8V - enables multi-year battery life in always-on patient monitors and pagers |
| Reset Timeout Period (min) | 40ms - ensures µP completes power stabilization before release, compatible with common boot sequences |
| RESET Output Type | Active-high push-pull - drives high without external pullup; sinks ≤0.3V at 1.2mA for clean logic-level assertion |
| Operating Voltage Range | 1.2V to 5.5V - supports single-cell Li-ion, 2-cell alkaline, and 3.3V/5V logic domains |
| VCC Validity Limit | Reset remains valid down to VCC = +1.1V - prevents undefined reset state during deep undervoltage conditions |
| MR Input Glitch Rejection | 200ns - suppresses noise-induced false resets in electrically noisy portable environments |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant), footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high during fault; no external pullup required; referenced to VCC |
| 2, 4 | GND | Ground reference - both pins must be connected to common system ground for stable operation and noise immunity |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; driven low to force reset; CMOS-compatible |
| 5 | VCC | Supply voltage input - monitored for reset condition; requires 0.1µF bypass capacitor to GND per datasheet recommendation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC (170nA typ) | Extends battery life in glucose meters and PDAs by minimizing standby current drain over years of operation |
| Factory-trimmed VTH (2.925V) | Eliminates need for external resistor dividers or calibration; ensures consistent 3.0V rail supervision across production lots |
| Guaranteed reset validity to VCC = +1.1V | Prevents metastability in µP reset inputs during severe brownout, avoiding undefined startup states |
| No external components required | Reduces BOM count and PCB area - ideal for space-constrained wearables and hearing aids |
| Immunity to short VCC transients | Rejects ≤40µs transients at 100mV overdrive, preventing spurious resets in noisy DC-DC converter environments |
Applications
| Portable Medical Devices | Handheld Consumer Electronics |
|---|---|
Use Scenario: Continuous glucose monitoring (CGM) devices powered by coin-cell batteries requiring multi-year operation without maintenance. IC Role / Device Role / Timing Role: Supervises 3.0V supply rail and asserts active-high RESET to ARM Cortex-M0 host MCU during brownout or manual recalibration. Use Value: 170nA supply current extends battery life beyond 36 months; 2.925V threshold matches nominal 3.0V rail with safety margin. |
Use Scenario: Feature-rich MP3 players with dual-voltage rails (1.8V core, 3.3V I/O) and frequent power cycling. IC Role / Device Role / Timing Role: Monitors 3.3V I/O supply and initiates controlled reset sequence upon voltage sag, coordinated with audio codec initialization. Use Value: 40ms reset timeout ensures SD card controller and DAC complete power-up before firmware execution resumes. |
| Industrial Handheld Terminals | Low-Power Wireless Sensors |
Use Scenario: Ruggedized barcode scanners used in warehouse environments with intermittent battery charging and ESD exposure. IC Role / Device Role / Timing Role: Provides MR-initiated reset via front-panel button and detects VCC droop during motor actuation or RF transmission bursts. Use Value: 200ns MR glitch rejection prevents false resets from ESD transients; 10kΩ internal MR pullup eliminates external resistor. |
Use Scenario: Battery-powered LoRaWAN environmental sensors deployed in remote locations with 10+ year lifetime targets. IC Role / Device Role / Timing Role: Supervises primary 3.0V lithium-thionyl-chloride cell and triggers reset if voltage drops below safe operating level during cold-temperature operation. Use Value: Valid reset assertion down to VCC = +1.1V ensures reliable shutdown before cell depletion damages data retention circuits. |
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 fixed threshold; 200ms reset timeout; 1.5µA ICC (typ); SOT23-5 | Higher supply current limits use in multi-year battery applications; fixed 3.3V threshold lacks flexibility for 3.0V rails | Select when 3.3V rail supervision is required and higher ICC is acceptable; not suitable for 2.925V precision monitoring |
| MAX6365KA29D2+T | Same 2.925V threshold and 40ms timeout; 1.2µA ICC (typ); includes watchdog timer; SOT23-6 | Extra WDI pin and watchdog functionality increase complexity and PCB footprint; higher ICC reduces battery life | Choose only if watchdog timer is mandatory; otherwise MAX6855UK29D2+T offers lower power and smaller size for pure voltage monitoring |
Compared with TPS3837K33DBVR and MAX6365KA29D2+T, the MAX6855UK29D2+T delivers the lowest ICC (170nA vs. µA-range), precise 2.925V threshold matching 3.0V rails, and minimal 5-pin SOT23 footprint - making it optimal for ultra-low-power, space-constrained, and cost-sensitive portable designs without watchdog requirements.
Availability
MAX6855UK29D2+T is available at Aetrix Electronics and suitable for portable medical devices, handheld consumer electronics, industrial handheld terminals, and low-power wireless sensors requiring stable component supply and long-term lifecycle support.
Supply support for MAX6855UK29D2+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 high-performance analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX6855UK29D2+T belongs to the MAX6854–MAX6869 nanopower supervisory family, designed specifically for battery-powered equipment where ultra-low quiescent current, precise voltage thresholds, and guaranteed reset behavior under brownout are critical.
FAQ
What is the exact reset threshold voltage of the MAX6855UK29D2+T?
The MAX6855UK29D2+T has a factory-trimmed reset threshold voltage of 2.925V, with a tolerance of ±2.5% over the full –40°C to +85°C temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "29" corresponds to 2.925V (min 2.852V, typ 2.925V, max 2.998V). The MAX6855UK29D2+T uses this precise threshold to supervise 3.0V rails with appropriate safety margin.
Does the MAX6855UK29D2+T include a watchdog timer function?
No, the MAX6855UK29D2+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI functionality. The MAX6855UK29D2+T is a dedicated voltage supervisor with manual reset (MR) and active-high push-pull RESET output - confirmed by its pinout (no WDI pin) and absence of watchdog-related electrical characteristics in its parameter tables.
What is the reset timeout period for the MAX6855UK29D2+T?
The MAX6855UK29D2+T has a minimum reset timeout period of 40ms, corresponding to suffix "D2" per Table 4 (Reset Timeout Periods). Typical and maximum values are 60ms and 80ms respectively. This timeout begins after VCC rises above the 2.925V threshold and MR is deasserted, ensuring sufficient hold time for microprocessor power stabilization before release.
Is the MAX6855UK29D2+T pin-compatible with other devices in the MAX6854–MAX6869 family?
The MAX6855UK29D2+T shares the same 5-pin SOT23-5 package and pinout as MAX6854/MAX6855/MAX6856 variants (Pin 1 = RESET, Pins 2&4 = GND, Pin 3 = MR, Pin 5 = VCC), but is not pin-compatible with MAX6861–MAX6869 due to differing pin functions (e.g., CT or WDI on Pin 1 or 4). Its active-high RESET output distinguishes it from MAX6854 (active-low push-pull) and MAX6856 (open-drain).
What is the supply current specification for the MAX6855UK29D2+T at 1.8V?
At VCC = 1.8V and TA = +25°C, the MAX6855UK29D2+T draws a typical supply current (ICC) of 170nA, with a maximum of 370nA - specified in the Electrical Characteristics table under "Supply Current" with condition "VCC = 1.8V". This ultra-low ICC is maintained across temperature and is critical for extending battery life in portable applications where the MAX6855UK29D2+T is deployed.
MAX6855UK29D2+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:
- 2.925V
- 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
MAX6855UK29D2+T FAQ
1.How can I place an order for MAX6855UK29D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK29D2+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 MAX6855UK29D2+T reliable?
The price and inventory of MAX6855UK29D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK29D2+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK29D2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK29D2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK29D2+T?
MAX6855UK29D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK29D2+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 MAX6855UK29D2+T?
For technical support, including MAX6855UK29D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK29D2+T requirements.
6.How does Aetrix verify that MAX6855UK29D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK29D2+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 MAX6855UK29D2+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK29D2+T?
All MAX6855UK29D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK29D2+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 MAX6855UK29D2+T part is unused and in its original packaging.
Return procedure for MAX6855UK29D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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