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Analog Devices Inc./Maxim Integrated MAX16997AAUA+
- Part No.:
- MAX16997AAUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX16997AAUA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:20,215
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Product details
Overview
MAX16997AAUA+ from Maxim Integrated is a high-voltage, low-quiescent-current microprocessor supervisory IC designed for automotive power monitoring and watchdog control. It features one open-drain ENABLE output, capacitor-adjustable watchdog timeout (tWP), EN input with car-battery-compatible threshold (1.235V), 5V–40V operating range, and AEC-Q100 qualification for use in engine control units and ADAS domain controllers.
For engineers reviewing the MAX16997AAUA+ datasheet, MAX16997AAUA+ pinout, MAX16997AAUA+ application, or MAX16997AAUA+ equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, automotive-grade thermal and voltage specifications, and validated alternative options for redundant system supervision.
Technical Context
The MAX16997AAUA+ implements a single-output supervisory architecture where ENABLE assertion depends strictly on EN voltage level and WDI edge timing - no RESET output is present. The watchdog timer initiates only when EN rises above 1.235V, and its first timeout period is extended to 8×tWP (e.g., 96ms with CSWT = 1200pF), reverting to normal tWP upon valid WDI trigger.
It uses precision internal ramp current sources (IRAMP_SWT = 500nA typ, IRAMP_SRT not applicable) to convert external capacitors into timeout periods, with WDI narrow-pulse immunity (ignores pulses <1µs) and TTL/CMOS-compatible open-drain ENABLE output rated to 28V. All operation is guaranteed over -40°C to +125°C with 18µA quiescent current at +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5.0V to 40.0V - supports direct connection to automotive battery rail without pre-regulation. |
| Quiescent Current | 18µA typical at +125°C - enables always-on monitoring in low-power ECU sleep modes. |
| EN Threshold Voltage | 1.235V ±120mV - matches standard automotive LDO feedback divider ratios for seamless integration. |
| Watchdog Timeout (tWP) | 12ms typical with CSWT = 1200pF - adjustable from 6.8ms to 217ms via SWT capacitor for software loop timing alignment. |
| Initial Watchdog Timeout | 96ms (8×tWP) on EN rise - prevents false triggers during power-up sequencing before firmware initialization. |
| ENABLE Output Rating | 28V max open-drain sink - allows direct interface to 12V/24V enable inputs of PMICs or backup controllers. |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive applications per AEC-Q100 Grade 0. |
Pinout & Package
MAX16997AAUA+ is housed in an 8-pin lead(Pb)-free µMAX package (3mm × 3mm, 0.5mm pitch), optimized for space-constrained automotive modules. Pin 1 is IN (power supply input), Pin 2 is EN (enable comparator input), Pins 3 and 7 are no-connect, Pin 4 is SWT (watchdog timeout adjustment), Pin 5 is GND, Pin 6 is WDI (watchdog input), Pin 8 is ENABLE (open-drain output).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1. IN | Power-supply input | Bypassed to GND with 0.1µF; accepts 5V–40V automotive battery rail directly. |
| 2. EN | Enable comparator input | High-impedance node; starts watchdog timing only when voltage exceeds 1.235V. |
| 3, 7. N.C. | No internal connection | Must remain unconnected; no routing or grounding permitted. |
| 4. SWT | Watchdog timeout adjustment | Connected to 500nA ramp current source; sets tWP via external capacitor to GND. |
| 5. GND | Ground reference | Primary return path for all internal circuits and external bypass capacitors. |
| 6. WDI | Watchdog input | Edge-sensitive; requires falling edges within tWP window; ignores pulses <1µs. |
| 8. ENABLE | Open-drain enable output | Asserts low after three consecutive WDI faults; sinks up to 5mA; pulled up externally to ≤28V. |
Key Features
| Feature | Design Value |
|---|---|
| Car battery-compatible EN input | 1.235V threshold enables direct monitoring of 3.3V/5V LDO outputs without level-shifting. |
| Capacitor-adjustable watchdog timeout | tWP set by single external capacitor (CSWT) - eliminates need for external timers or microcontroller polling. |
| Extended initial watchdog timeout | 8×tWP on EN rise prevents spurious ENABLE assertion during boot-up before firmware begins WDI servicing. |
| TTL/CMOS-compatible open-drain ENABLE | 28V-rated output interfaces natively with 12V/24V PMIC enable pins or discrete load switches. |
| AEC-Q100 qualified | Qualified to Grade 0 (-40°C to +125°C) with full automotive reliability testing - suitable for safety-critical ECUs. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Monitors main 5V LDO output and microcontroller WDI signal in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Supervisory IC that asserts ENABLE only after three consecutive missed WDI edges - triggering hardware switchover to backup controller. Use Value: Prevents undetected firmware lockup during transient battery dips (e.g., cranking), ensuring fail-operational behavior per ISO 26262 ASIL-B requirements. |
Use Scenario: Embedded in radar or camera domain controller PCBs to supervise vision processor activity under varying thermal loads. IC Role / Device Role / Timing Role: Enables watchdog supervision independent of main SoC reset logic - provides secondary fault detection layer. Use Value: Guarantees 12ms–217ms configurable timeout alignment with vision pipeline execution cycles, avoiding false resets during heavy compute bursts. |
| Body Control Module (BCM) | Electric Power Steering (EPS) |
Use Scenario: Integrated into BCM power tree to monitor 3.3V MCU supply and validate CAN communication stack liveness. IC Role / Device Role / Timing Role: Uses EN input tied to 3.3V rail and WDI driven by CAN TX interrupt - asserts ENABLE if CAN stack freezes. Use Value: Delivers 18µA quiescent current at +125°C, enabling always-on supervision without compromising BCM sleep-mode current budget. |
Use Scenario: Mounted on EPS motor driver board to supervise torque-control MCU during active steering maneuvers. IC Role / Device Role / Timing Role: Triggers ENABLE assertion after three consecutive WDI timeouts - initiating safe torque reduction and fallback mode. Use Value: Supports 40V absolute max input rating to withstand load-dump transients up to ISO 7637-2 Pulse 5a, ensuring robustness in high-noise motor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16998AAUA+ | Includes dual outputs (RESET + ENABLE); adds RESETIN input and power-on/power-off reset functionality; same 8-pin µMAX package and EN/WDI timing behavior. | Required where μC reset assertion is mandatory (e.g., legacy designs requiring active-low reset pulse on boot). | Select MAX16998AAUA+ only if RESET output is needed - MAX16997AAUA+ saves board space and BOM cost where ENABLE-only supervision suffices. |
| TPS3839G33DBVR | Lower voltage range (1.3V–6.5V); fixed 3.3V reset threshold; no adjustable watchdog; 5-pin SOT-23 package; 1.5µA IQ. | Suitable for low-voltage embedded systems (e.g., infotainment SoCs), but cannot replace MAX16997AAUA+ in 12V/24V automotive rails. | Use TPS3839G33DBVR only in non-automotive, low-voltage applications - MAX16997AAUA+ is irreplaceable for high-voltage, capacitor-tunable watchdog supervision. |
Compared with MAX16998AAUA+, MAX16997AAUA+ eliminates RESET output complexity and reduces pin count while retaining identical EN-triggered watchdog logic and automotive temperature/rating compliance; versus TPS3839G33DBVR, it delivers 5× higher voltage capability and field-configurable timing essential for modern ECU architectures.
Availability
MAX16997AAUA+ is available at Aetrix Electronics and suitable for automotive engine control units, ADAS domain controllers, and electric power steering modules requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX16997AAUA+ 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 automotive, industrial, and communications markets, with emphasis on high-reliability, low-power solutions.
The MAX16997/MAX16998 family targets automotive subsystem supervision - delivering high-voltage tolerance, AEC-Q100 qualification, and capacitor-programmable timing to replace discrete watchdog circuits in ECUs and ADAS modules.
FAQ
Does MAX16997AAUA+ provide a RESET output?
No, MAX16997AAUA+ generates only an ENABLE output. Unlike the MAX16998 series, it lacks a RESET pin or internal reset comparator - supervision is implemented solely through ENABLE assertion after three consecutive WDI faults. This simplifies designs where external reset generation is handled elsewhere or unnecessary. MAX16997AAUA+ relies entirely on EN voltage level and WDI edge timing to determine ENABLE state.
What is the function of the EN pin on MAX16997AAUA+?
The EN pin on MAX16997AAUA+ is a high-impedance comparator input that controls watchdog activation: the internal timer starts only when EN voltage exceeds 1.235V, and each rising edge crossing this threshold triggers an extended 8×tWP initial timeout. This ensures reliable startup supervision without false triggers during power ramp-up. EN must be driven by a stable voltage source - floating or noisy EN signals will cause undefined watchdog behavior in MAX16997AAUA+.
How is the watchdog timeout period set for MAX16997AAUA+?
The watchdog timeout period (tWP) for MAX16997AAUA+ is set by connecting an external capacitor (CSWT) between the SWT pin and GND. With a typical ramp current of 500nA and VRAMP = 1.235V, tWP = (CSWT × VRAMP) / IRAMP × 4 - yielding 12ms with 1200pF. Capacitor selection directly determines timeout duration, enabling precise alignment with firmware loop timing. MAX16997AAUA+ does not support resistor-based or digital timeout configuration.
Is MAX16997AAUA+ compatible with 24V commercial vehicle systems?
Yes, MAX16997AAUA+ supports 5V–40V input range and is rated for 45V absolute maximum on the IN pin, making it fully compatible with 24V commercial vehicle battery systems including load-dump transients per ISO 7637-2. Its 18µA quiescent current at +125°C and AEC-Q100 Grade 0 qualification ensure reliable operation in harsh under-hood environments typical of trucks and buses - confirmed in MAX16997AAUA+ datasheet Section "Absolute Maximum Ratings" and "Electrical Characteristics".
What happens to ENABLE output when VIN drops below 1.1V?
When VIN drops below 1.1V, the ENABLE output of MAX16997AAUA+ is no longer guaranteed to maintain correct logic state - the device may enter undefined behavior or release the output. The datasheet explicitly states that correct ENABLE output logic is only guaranteed when VIN remains >1.1V. Therefore, system-level brownout protection must be implemented upstream of MAX16997AAUA+, and ENABLE should not be relied upon for critical shutdown signaling below this threshold.
MAX16997AAUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Watchdog Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX16997AAUA+ FAQ
1.How can I place an order for MAX16997AAUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16997AAUA+ 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 MAX16997AAUA+ reliable?
The price and inventory of MAX16997AAUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16997AAUA+ is usually 5 days.
3.What payment methods are accepted for MAX16997AAUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16997AAUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16997AAUA+?
MAX16997AAUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16997AAUA+ 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 MAX16997AAUA+?
For technical support, including MAX16997AAUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16997AAUA+ requirements.
6.How does Aetrix verify that MAX16997AAUA+ is sourced from the original manufacturer or authorized distributors?
All MAX16997AAUA+ 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 MAX16997AAUA+ meets industry standards.
7.What is the process for return or replacement of MAX16997AAUA+?
All MAX16997AAUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16997AAUA+, 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 MAX16997AAUA+ part is unused and in its original packaging.
Return procedure for MAX16997AAUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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