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Analog Devices Inc./Maxim Integrated MAX16155ABAD+
- Part No.:
- MAX16155ABAD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX16155ABAD+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,886
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Product details
Overview
MAX16155ABAD+ from Analog Devices is a nanoPower supervisory circuit with integrated watchdog timer, designed for ultra-low-power microcontroller reset and code-execution monitoring in battery-critical systems. It features a factory-trimmed 1.5V reset threshold (±2.5% accuracy), 400nA typical supply current, open-drain RST and WDO outputs, and WD_EN input to enable/disable the watchdog function. It operates across -40°C to +125°C and supports 1.2V–5.5V supply range - ideal for glucose monitors and portable medical devices.
For engineers reviewing the MAX16155ABAD+ datasheet, MAX16155ABAD+ pinout, MAX16155ABAD+ application, or MAX16155ABAD+ equivalent, key selection considerations include its 6-pin SOT23 package, watchdog enable control, ±2.5% VTH accuracy over temperature, 128ms minimum reset timeout, and compatibility with low-voltage microcontrollers requiring <1µA quiescent current.
Technical Context
The MAX16155ABAD+ implements a dual-monitoring architecture: a precision voltage detector with hysteresis (0.4% VHYS) triggers RST on VCC drop below 1.5V, while a programmable watchdog timer monitors WDI transitions and asserts WDO if no valid edge occurs within the selected timeout period. Its internal startup delay (100ms nominal) ensures reliable initialization before watchdog monitoring begins.
Unlike the MAX16152/MAX16153 series, the MAX16155ABAD+ replaces MR with WD_EN - an active-high logic input that enables deterministic watchdog control during system boot or sleep modes. The device uses an open-drain output structure for both RST and WDO, requiring external pullups and supporting wired-OR configurations with other system supervisors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 400nA typical - enables multi-year operation on coin-cell batteries in always-on medical sensors. |
| Reset Threshold (VTH) | 1.5V ±2.5% - factory-trimmed for stable brownout detection across -40°C to +125°C. |
| Reset Timeout (tRP) | 128ms minimum - ensures sufficient hold time for microcontroller power-up sequencing. |
| Watchdog Timeout (tWD) | 128s nominal - configurable via part number; provides long-duration fault detection for infrequent firmware tasks. |
| Watchdog Startup Delay | 100ms nominal - prevents false WDO assertion during initial power ramp and MCU initialization. |
| WD_EN Setup Time | 300µs max - defines minimum high-time on WD_EN before watchdog timer becomes active. |
| Operating Voltage Range | 1.2V to 5.5V - supports direct interface with Li-ion, alkaline, and regulated 3.3V/1.8V rails. |
Pinout & Package
The MAX16155ABAD+ is housed in a 6-pin SOT23 package (outline 21-0058, land pattern 90-0175), RoHS-compliant with + suffix, measuring 2.9mm × 1.6mm × 1.1mm. Thermal resistance θJA = 115°C/W on a four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply and monitoring input | Primary power rail connection; also serves as monitored voltage source - bypassed with 0.1µF capacitor to GND. |
| GND | Ground reference | System ground return path for all internal circuits and output leakage paths. |
| WDI | Watchdog input | Accepts logic transitions (high↔low) to clear internal watchdog timer; ignored when WDO/RST asserted or WD_EN low. |
| WD_EN | Watchdog enable input | Active-high control: drives watchdog timer ON/OFF; requires ≥0.8×VCC for logic high, setup time ≤300µs. |
| RST | Reset output | Open-drain, active-low signal asserting during VCC undervoltage or manual reset; requires external pullup resistor. |
| WDO | Watchdog output | Open-drain, active-low pulse (100–300ms width) signaling code execution failure; compatible with MCU reset or NMI inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 400nA typical supply current enables >10-year battery life in continuous-monitoring wearable sensors. |
| WD_EN control | Hardware-gated watchdog activation allows safe disable during bootloader execution or deep-sleep modes. |
| ±2.5% VTH accuracy | Factory-trimmed threshold ensures consistent brownout response without calibration across full temperature range. |
| Open-drain RST/WDO | Supports level-shifting, wired-OR reset buses, and flexible pullup voltage selection (e.g., 1.8V or 3.3V). |
| 100ms watchdog startup delay | Prevents spurious timeouts during MCU power-up and clock stabilization, eliminating need for software delay loops. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Loggers |
|---|---|
|
Use Scenario: Continuous subcutaneous glucose sensing with Bluetooth LE transmission every 5 minutes. IC Role / Device Role / Timing Role: Supervises 1.8V MCU supply and verifies firmware loop integrity via WDI strobing between sensor reads and radio bursts. Use Value: Prevents silent firmware lockup during RF transmission by triggering WDO reset if BLE stack hangs - ensuring uninterrupted glycemic data capture. |
Use Scenario: Portable ECG patch recording heart rate and SpO₂ for 72-hour ambulatory studies. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output powering analog front-end and ARM Cortex-M0+, asserting RST on battery sag below 2.8V. Use Value: Guarantees clean MCU reset at defined brownout point, avoiding corrupted memory writes during low-battery shutdown sequences. |
| Smart Utility Meters | Industrial Handheld Scanners |
|
Use Scenario: AMI meter with LoRaWAN uplink operating intermittently on primary lithium battery. IC Role / Device Role / Timing Role: Provides 128ms reset timeout and 128s watchdog interval aligned with scheduled wake-up and transmit cycles. Use Value: Eliminates need for external RC timing components - reducing BOM count and PCB area in space-constrained meter modules. |
Use Scenario: Rugged barcode scanner powered by removable 3.7V Li-ion pack with cold-temperature operation down to -20°C. IC Role / Device Role / Timing Role: Supervises 3.3V buck converter output and validates application firmware execution using WD_EN-controlled watchdog during scan-triggered wake-up. Use Value: Enables watchdog disable during standby (WD_EN = low), then precise re-enable at wake-up - conserving µA-level sleep current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory and watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16153ABAD+ | Same SOT23 package and 1.5V threshold, but includes MR input instead of WD_EN; no hardware watchdog disable capability. | Requires external pushbutton or GPIO for manual reset; unsuitable where watchdog must be disabled without MCU intervention. | Select MAX16153ABAD+ only if manual reset functionality is required and WD_EN control is unnecessary. |
| TPS3808G15DBVR | 1.5V fixed threshold, 1.6µA ICC (4× higher), no WD_EN pin; watchdog enable is not hardware-controllable. | Lacks dedicated watchdog enable input - watchdog is always active after power-up unless disabled via I²C (not available on TPS3808G15). | Choose TPS3808G15DBVR only if ultra-low ICC is not critical and system design tolerates constant watchdog activity. |
Compared with MAX16153ABAD+, the MAX16155ABAD+ trades manual reset for hardware watchdog enable - enabling safer low-power operation. Against TPS3808G15DBVR, it delivers 4× lower supply current and deterministic WD_EN control, making it superior for battery-limited medical and metering applications.
Availability
MAX16155ABAD+ is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, and smart utility meters requiring stable component supply with guaranteed long-term availability and automotive-grade temperature support.
Supply support for MAX16155ABAD+ 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 MAX16155ABAD+ belongs to Analog Devices' nanoPower supervisor family, engineered specifically for battery-powered medical and portable instrumentation where sub-µA quiescent current and deterministic watchdog control are mandatory.
FAQ
What is the factory-set reset threshold voltage for MAX16155ABAD+?
The MAX16155ABAD+ has a factory-trimmed reset threshold of 1.5V with ±2.5% accuracy across -40°C to +125°C. This value is fixed per the "B" suffix in the part number (MAX16155BBAD+) and cannot be adjusted externally. The threshold is referenced to VCC and includes 0.4% hysteresis to prevent chatter during slow-rising supply conditions.
Does MAX16155ABAD+ support manual reset functionality?
No, the MAX16155ABAD+ does not include a manual reset (MR) input. It replaces MR with WD_EN - an active-high watchdog enable pin. For manual reset capability, select the pin-compatible MAX16153ABAD+, which shares the same 6-pin SOT23 package and 1.5V threshold but includes MR instead of WD_EN.
What is the watchdog timeout period for MAX16155ABAD+?
The MAX16155ABAD+ has a nominal watchdog timeout period of 128 seconds, indicated by the "D" suffix in the part number (MAX16155ABAD+). This value is factory-programmed and fixed; timeout options (1s, 8s, 32s, 128s) are selected at order time via the ordering code - not configurable in-circuit.
Can MAX16155ABAD+ operate from a 1.2V supply?
Yes, the MAX16155ABAD+ operates over a 1.2V to 5.5V supply range. At 1.2V, it maintains full functionality including 1.5V threshold monitoring (VCC must exceed VTH to deassert RST), 400nA typical supply current, and valid logic levels on WD_EN and WDI (VIH = 0.8×VCC, VIL = 0.3×VCC). Performance is fully specified down to 1.2V.
What package type and dimensions does MAX16155ABAD+ use?
The MAX16155ABAD+ uses a 6-pin SOT23 package (outline 21-0058), measuring 2.9mm × 1.6mm × 1.1mm with standard gull-wing leads. It is RoHS-compliant (indicated by the "+" suffix) and rated for -40°C to +125°C operation. Land pattern 90-0175 applies for PCB layout.
MAX16155ABAD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- nanoPower
- Package/Case:
- SOT-23-6
- Packaging:
- Strip
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.5V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 80µs Typical
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX16155ABAD+ FAQ
1.How can I place an order for MAX16155ABAD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16155ABAD+ 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 MAX16155ABAD+ reliable?
The price and inventory of MAX16155ABAD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16155ABAD+ is usually 5 days.
3.What payment methods are accepted for MAX16155ABAD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16155ABAD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16155ABAD+?
MAX16155ABAD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16155ABAD+ 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 MAX16155ABAD+?
For technical support, including MAX16155ABAD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16155ABAD+ requirements.
6.How does Aetrix verify that MAX16155ABAD+ is sourced from the original manufacturer or authorized distributors?
All MAX16155ABAD+ 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 MAX16155ABAD+ meets industry standards.
7.What is the process for return or replacement of MAX16155ABAD+?
All MAX16155ABAD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16155ABAD+, 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 MAX16155ABAD+ part is unused and in its original packaging.
Return procedure for MAX16155ABAD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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