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Analog Devices Inc./Maxim Integrated MAX16155DDCC+T
- Part No.:
- MAX16155DDCC+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX16155DDCC+T.pdf
- Description:
- NANOPOWER SUPERVISORY & WATCHDOG
- Quantity:
- Payment:
- Shipping:
Inventory:3,891
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Product details
Overview
MAX16155DDCC+T from Analog Devices is a nanoPower supervisory circuit with integrated watchdog timer, designed for ultra-low-power microcontroller-based systems. It monitors a single supply voltage (1.2V–5.5V), asserts an open-drain reset (RST) when VCC falls below 3.3V ±2.5%, and provides a 128s watchdog timeout with WD_EN control. Used in glucose monitors and portable medical devices requiring guaranteed system recovery under brownout or software lockup.
For engineers reviewing the MAX16155DDCC+T datasheet, MAX16155DDCC+T pinout, MAX16155DDCC+T application, or MAX16155DDCC+T equivalent, this page delivers verified electrical parameters, SOT23-6 package mapping, watchdog enable logic behavior, reset timing accuracy, and real-world use cases in battery-powered health monitoring systems.
Technical Context
The MAX16155DDCC+T implements a factory-trimmed 3.3V reset threshold with ±2.5% accuracy across –40°C to +125°C and features a 128ms minimum reset timeout period. Its watchdog function is enabled/disabled via the active-high WD_EN input, with 300μs setup time after assertion.
It uses a transition-detecting watchdog timer that clears on any valid WDI edge (high-to-low or low-to-high) within the 128s timeout window. The device outputs open-drain RST and WDO signals, each requiring external pullup resistors, and draws only 400nA typical supply current at VCC = VTH + 150mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.3V ±2.5% - factory-trimmed voltage level at which RST asserts during VCC drop; ensures reliable brownout detection in 3.3V systems. |
| Supply Current | 400nA typical - enables multi-year operation from coin-cell batteries in always-on patient monitors. |
| Watchdog Timeout | 128s nominal - long-duration supervision suitable for infrequent but critical firmware execution checks. |
| Reset Timeout Period | 128ms minimum - guarantees microcontroller reset signal duration sufficient for full core initialization. |
| Operating Voltage Range | 1.2V to 5.5V - supports direct interface with Li-ion, alkaline, and regulated 3.3V/5V rails without level shifting. |
| WD_EN Setup Time | 300μs maximum - defines minimum delay between WD_EN high assertion and watchdog timer activation. |
| Input Logic Levels | VIH = 0.8×VCC, VIL = 0.3×VCC - compatible with standard CMOS I/O without external biasing. |
Pinout & Package
MAX16155DDCC+T is housed in a 6-pin SOT23 package (package code U6+1, outline 21-0058), with 1.27mm × 2.2mm footprint and 0.95mm height. Thermal resistance θJA = 115°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply and monitoring input | Primary power rail connection; also the monitored voltage source for reset generation - bypass with 0.1μF capacitor. |
| GND | Ground reference | Analog and digital ground return path; must be low-impedance to ensure accurate threshold detection. |
| WDI | Watchdog input | Edge-sensitive input - toggling (any direction) within 128s clears internal timer; ignored when WD_EN is low or WDO/RST asserted. |
| WD_EN | Watchdog enable control | Active-high logic input - drives watchdog circuitry on/off; 300μs setup required before timer becomes active. |
| RST | Open-drain reset output | Asserts low when VCC < 3.3V; remains low for ≥128ms after VCC rises above threshold + hysteresis - requires external pullup. |
| WDO | Open-drain watchdog output | Pulses low for 100–300ms upon watchdog timeout - used to reset MCU or trigger fault interrupt; requires external pullup. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 400nA typical - extends battery life in wearable glucose monitors beyond 5 years on CR2032. |
| Factory-trimmed 3.3V threshold | ±2.5% accuracy over –40°C to +125°C - eliminates need for external resistor divider or calibration in 3.3V systems. |
| Configurable watchdog enable | WD_EN pin allows runtime disable of watchdog during bootloader or debug mode - prevents spurious resets. |
| Open-drain RST and WDO outputs | Supports wired-OR configuration and mixed-voltage system interfacing - compatible with 1.8V, 3.3V, or 5V logic families. |
| 128ms reset timeout | Guaranteed minimum assertion time - ensures complete microcontroller reset sequence including flash initialization and clock stabilization. |
Applications
| Glucose Monitoring Systems | Portable ECG Devices |
|---|---|
|
Use Scenario: Continuous subcutaneous glucose sensing with Bluetooth LE transmission every 5 minutes, powered by CR2032 battery. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output and validates MCU firmware execution via 128s watchdog interval - triggers hard reset if sensor readout or radio stack hangs. Use Value: Prevents undetected firmware lockup during critical measurement cycles, ensuring clinical-grade data integrity and regulatory compliance (ISO 14971). |
Use Scenario: Handheld single-lead ECG acquisition unit operating 24/7 in ambulatory settings with rechargeable LiPo battery. IC Role / Device Role / Timing Role: Monitors main 3.3V supply and asserts RST during brownout; uses WD_EN to disable watchdog during firmware OTA updates to avoid false timeouts. Use Value: Enables safe field-upgrade capability while maintaining fail-safe reset behavior during normal operation - reduces field failure rate by >90% vs. no-supervisor designs. |
| Smart Insulin Pens | Wireless Pulse Oximeters |
|
Use Scenario: Disposable insulin delivery pen with dose tracking, NFC pairing, and 2-year shelf life before first use. IC Role / Device Role / Timing Role: Provides power-on reset and brownout protection for ARM Cortex-M0+ MCU; leverages 400nA quiescent current to minimize self-discharge during storage. Use Value: Ensures first-use reliability after long-term storage - eliminates "dead-on-arrival" returns caused by undetected MCU state corruption. |
Use Scenario: Battery-powered fingertip pulse oximeter performing SpO₂ and PR measurements every 2 seconds, with BLE streaming to smartphone. IC Role / Device Role / Timing Role: Supervises 3.3V rail from DC-DC converter and asserts RST if supply dips below 3.3V during LED pulsing; uses 128ms timeout to accommodate transient load spikes. Use Value: Maintains measurement continuity during dynamic current loads - avoids missed readings or corrupted waveform buffers due to supply-induced MCU reset instability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisor-with-watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16155DECC+T | 5.0V reset threshold instead of 3.3V; same 128ms reset timeout, 128s watchdog, SOT23-6 package. | Targeted at 5V industrial sensors or legacy MCU platforms - not drop-in for 3.3V systems without supply rail adjustment. | Select MAX16155DECC+T only when system VCC is 5.0V nominal and brownout detection must occur at 5.0V ±2.5%. |
| TPS3808G33DBVR | 3.3V threshold, but fixed 200ms reset timeout and no WD_EN pin - watchdog always enabled; 1.5μA ICC (vs. 400nA). | Suitable for cost-sensitive consumer wearables where ultra-low ICC is secondary to BOM simplicity - lacks runtime watchdog disable. | Choose TPS3808G33DBVR only if 200ms reset timeout meets MCU requirements and watchdog must remain permanently active. |
Compared with MAX16155DDCC+T, MAX16155DECC+T shifts reset detection to 5.0V and cannot supervise 3.3V rails without risk of premature reset, while TPS3808G33DBVR increases supply current 3.75× and removes WD_EN flexibility - making MAX16155DDCC+T optimal for precision 3.3V medical devices requiring configurable supervision.
Availability
MAX16155DDCC+T is available at Aetrix Electronics and suitable for glucose monitors, portable ECG units, and smart insulin pens requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX16155DDCC+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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The MAX16155DDCC+T belongs to the nanoPower supervisor family, engineered specifically for battery-critical medical and portable electronics where sub-1μA quiescent current, factory-trimmed thresholds, and configurable watchdog control are mandatory design requirements.
FAQ
What is the factory-set reset threshold voltage for MAX16155DDCC+T?
The MAX16155DDCC+T has a factory-trimmed reset threshold of 3.3V with ±2.5% accuracy across –40°C to +125°C. This value is laser-trimmed during production and does not require external components. The threshold is specified in the Ordering Information table and confirmed in the Electrical Characteristics section of the MAX16155DDCC+T datasheet under "VCC Reset Threshold Accuracy."
Does MAX16155DDCC+T support disabling the watchdog function during operation?
Yes, MAX16155DDCC+T supports runtime watchdog disable via the WD_EN pin. Driving WD_EN low disables the watchdog timer entirely - the device ignores all WDI transitions until WD_EN is pulled high again. After WD_EN goes high, the watchdog activates following a 300μs setup time (tSETUP), as documented in the MAX16155DDCC+T Electrical Characteristics table.
What is the minimum reset timeout period for MAX16155DDCC+T?
The MAX16155DDCC+T has a minimum reset timeout period of 128ms. This value is fixed for the DD variant per the Selector Guide and applies after VCC rises above the 3.3V threshold plus hysteresis. The timeout ensures sufficient duration for microcontroller core and peripheral initialization before releasing the reset signal.
Can MAX16155DDCC+T operate from a 1.8V supply?
Yes, MAX16155DDCC+T operates from 1.2V to 5.5V, so it functions correctly at 1.8V. However, its 3.3V reset threshold means it will assert RST whenever VCC drops below 3.3V - making it unsuitable for monitoring 1.8V rails directly. For 1.8V supervision, a different variant like MAX16155BCAA+T (1.8V threshold) is required.
What package type and footprint does MAX16155DDCC+T use?
MAX16155DDCC+T uses a 6-pin SOT23 package (outline number 21-0058, land pattern 90-0175). Its dimensions are 1.27mm × 2.2mm × 0.95mm, with standard SOT23 pin spacing (0.95mm pitch). This package is compatible with automated pick-and-place and reflow processes, and thermal resistance is specified as θJA = 115°C/W on a four-layer PCB.
MAX16155DDCC+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Type:
- Watchdog Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.5V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 128ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX16155DDCC+T FAQ
1.How can I place an order for MAX16155DDCC+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16155DDCC+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 MAX16155DDCC+T reliable?
The price and inventory of MAX16155DDCC+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16155DDCC+T is usually 5 days.
3.What payment methods are accepted for MAX16155DDCC+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16155DDCC+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16155DDCC+T?
MAX16155DDCC+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16155DDCC+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 MAX16155DDCC+T?
For technical support, including MAX16155DDCC+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16155DDCC+T requirements.
6.How does Aetrix verify that MAX16155DDCC+T is sourced from the original manufacturer or authorized distributors?
All MAX16155DDCC+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 MAX16155DDCC+T meets industry standards.
7.What is the process for return or replacement of MAX16155DDCC+T?
All MAX16155DDCC+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16155DDCC+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 MAX16155DDCC+T part is unused and in its original packaging.
Return procedure for MAX16155DDCC+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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