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Analog Devices Inc./Maxim Integrated MAX16997AAUA/V+
- Part No.:
- MAX16997AAUA/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX16997AAUA/V+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,061
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Product details
Overview
The MAX16997AAUA/V+ from Maxim Integrated is an automotive-grade high-voltage microprocessor supervisory IC with watchdog and enable functionality only-no reset output. It operates from 5V to 40V input, draws just 18µA typical quiescent current at +125°C, and features capacitor-adjustable watchdog timeout (tWP) via SWT pin. It is used in automotive powertrain and body control modules to detect MCU software lockup and trigger redundant system switchover.
For engineers reviewing the MAX16997AAUA/V+ datasheet, MAX16997AAUA/V+ pinout, MAX16997AAUA/V+ application, or MAX16997AAUA/V+ equivalent, key selection criteria include its single ENABLE open-drain output, EN-input–controlled watchdog activation, 8× extended initial timeout on EN rise, AEC-Q100 qualification, and operation across -40°C to +125°C.
Technical Context
The MAX16997AAUA/V+ implements a voltage-controlled watchdog timer that starts only when the EN input rises above 1.235V threshold; it does not monitor RESETIN or generate RESET. Its watchdog timeout (tWP) is set by external capacitor CSWT on SWT, with ramp current IRAMP_SWT = 500nA and VRAMP = 1.235V.
Upon EN crossing threshold, the first timeout period is 8× tWP (e.g., 96ms for CSWT = 1200pF); subsequent timeouts revert to nominal tWP. ENABLE asserts low after three consecutive WDI faults and remains low until three valid WDI falling edges occur within tWP-enabling fail-safe handover to backup circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input 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 vehicle subsystems. |
| Watchdog Timeout Range | 6.8ms to 217.36ms - adjustable via 680pF–22nF capacitor on SWT pin for software loop timing alignment. |
| EN Input Threshold | 1.235V (rising), ±20mV temp drift - allows precise activation control using resistive divider from monitored supply. |
| ENABLE Output Rating | Open-drain, 28V max pull-up, 0.4V low at 5mA - interfaces directly with 3.3V/5V/12V logic or high-side driver enable inputs. |
| WDI Pulse Immunity | Rejects pulses < 6.5µs - prevents false triggers from noise or EMI on watchdog input line. |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive environments per AEC-Q100 Grade 0. |
Pinout & Package
MAX16997AAUA/V+ is housed in an 8-pin lead(Pb)-free µMAX package (3mm × 3mm, 0.5mm pitch), RoHS-compliant and qualified for automotive use. The package exposes no exposed pad; thermal resistance θJA = 206.3°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Power-supply input | Bypassed to GND with 0.1µF ceramic; accepts 5V–40V unregulated automotive rail. |
| 2 EN | Enable comparator input | High-impedance node; rising edge >1.235V starts watchdog timer and enables ENABLE output. |
| 3,7 N.C. | No connection | Not internally bonded; must remain floating or grounded per layout best practice. |
| 4 SWT | Watchdog timeout adjustment | Connects to precision 500nA current source; capacitor to GND sets tWP (6.8ms–217ms). |
| 5 GND | Ground reference | Primary return path; requires low-inductance connection to system ground plane. |
| 6 WDI | Watchdog input | High-Z CMOS/TTL-compatible; falling edge resets watchdog counter; narrow-pulse immune. |
| 8 ENABLE | Open-drain enable output | Asserts low after 3 consecutive WDI faults; requires external pull-up to 2.5V–28V logic rail. |
Key Features
| Feature | Design Value |
|---|---|
| Car battery-compatible EN input | Threshold of 1.235V allows direct monitoring of 5V LDO outputs or scaled battery rails via resistor divider. |
| 8× extended initial watchdog timeout | First tWP after EN rise is 8× nominal - accommodates MCU boot sequence before watchdog supervision begins. |
| TTL/CMOS-compatible open-drain ENABLE | Supports flexible interface to 3.3V, 5V, or 12V enable inputs without level-shifting components. |
| AEC-Q100 qualified | Qualified to Grade 0 (-40°C to +125°C ambient), ensuring reliability in safety-critical automotive applications. |
| Low 18µA quiescent current at +125°C | Enables continuous supervision in always-on domains (e.g., CAN gateway, body controller) without battery drain. |
Applications
| Engine Control Unit (ECU) Supervision | Advanced Driver Assistance Systems (ADAS) Power Sequencing |
|---|---|
|
Use Scenario: Monitors main MCU in gasoline/diesel ECU during cold cranking and hot soak conditions where supply voltage dips or software hangs may occur. IC Role / Device Role / Timing Role: Enables fail-safe switchover to backup MCU or safe state logic upon detection of three consecutive WDI faults. Use Value: Prevents undetected MCU lockup during critical engine operation, supporting ISO 26262 ASIL-B functional safety requirements. |
Use Scenario: Supervises vision processor or radar SoC in ADAS domain controller during power-up sequencing and runtime operation. IC Role / Device Role / Timing Role: Generates ENABLE signal only after validated EN rise and sustained WDI activity-ensuring subsystem readiness before enabling high-power sensors. Use Value: Eliminates spurious enable assertions during brown-out recovery or noisy startup, improving system robustness. |
| Automotive Gateway Module | Electric Vehicle Battery Management Interface |
|
Use Scenario: Provides watchdog supervision for CAN/LIN gateway MCU handling communication between vehicle domains. IC Role / Device Role / Timing Role: Uses EN input tied to 5V LDO output to gate watchdog activation-ensuring supervision only when core power is stable. Use Value: Reduces false resets caused by transient LDO dropout while maintaining full fault coverage during steady-state operation. |
Use Scenario: Monitors BMS microcontroller responsible for cell voltage sampling and thermal management algorithms. IC Role / Device Role / Timing Role: Asserts ENABLE to isolate faulty BMS firmware and activate redundant safety path (e.g., hardware cutoff) after confirmed WDI failure. Use Value: Supports functional safety goals by enabling hardware-level response to software failures without CPU intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar watchdog-enable supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16998AAUA/V+ | Provides both RESET and ENABLE outputs; uses RESETIN instead of EN; no 8× initial timeout extension. | Required where μC reset assertion is mandatory (e.g., legacy MCU with no internal POR), not just enable signaling. | Select MAX16998AAUA/V+ if dual-output supervision and power-on reset functionality are needed alongside watchdog monitoring. |
| TLV809EADBZR | Single-channel 3.3V supervisor with fixed 200ms reset timeout; no watchdog, no EN control, 1.8V–6V supply range. | Limited to low-voltage digital rails; lacks high-voltage capability, adjustable timing, or automotive qualification. | Choose TLV809EADBZR only for cost-sensitive non-automotive embedded systems with simple reset-only needs and ≤6V supply. |
Compared with MAX16998AAUA/V+, the MAX16997AAUA/V+ trades RESET output for EN-based activation and extended boot timeout-ideal for systems where enable signaling suffices and MCU reset is handled elsewhere. Compared with TLV809EADBZR, it delivers automotive-grade high-voltage supervision with programmable timing and fault-handling intelligence.
Availability
MAX16997AAUA/V+ is available at Aetrix Electronics and suitable for automotive powertrain control, ADAS domain controllers, and EV battery interface modules requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX16997AAUA/V+ 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, mixed-signal, and power management ICs for automotive, industrial, and communications applications.
The MAX16997/MAX16998 family was developed specifically for high-reliability automotive supervisory functions-delivering adjustable watchdog timing, low IQ operation, and AEC-Q100 compliance in compact µMAX packages.
FAQ
Does the MAX16997AAUA/V+ provide a RESET output?
No, the MAX16997AAUA/V+ does not include a RESET output. It generates only an ENABLE signal in response to watchdog faults. Unlike the MAX16998 series, it lacks RESETIN monitoring and RESET assertion capability. Its design focuses exclusively on enabling redundant circuitry rather than resetting the primary MCU-making it suitable for architectures where reset is handled separately or not required.
What is the function of the EN pin on the MAX16997AAUA/V+?
The EN pin on the MAX16997AAUA/V+ serves as a voltage-controlled enable input for the watchdog timer. When EN rises above 1.235V, the watchdog circuit activates and begins timing. If EN falls below threshold, the watchdog is disabled. Each EN rise triggers an 8× extended initial timeout period (8 × tWP), accommodating MCU boot sequences before supervision commences.
How is the watchdog timeout period set for the MAX16997AAUA/V+?
The watchdog timeout period (tWP) for the MAX16997AAUA/V+ is set by connecting an external capacitor (CSWT) between the SWT pin and GND. Using IRAMP_SWT = 500nA and VRAMP = 1.235V, tWP = (CSWT × VRAMP) / IRAMP × 4. For example, a 1200pF capacitor yields tWP ≈ 12ms. Capacitor values from 680pF to 22nF support timeout ranges from 6.8ms to 217.36ms.
Is the MAX16997AAUA/V+ qualified for automotive applications?
Yes, the MAX16997AAUA/V+ is AEC-Q100 qualified (Grade 0) and specified for operation from -40°C to +125°C ambient temperature. The "/V" suffix explicitly denotes automotive qualification, and the device meets stringent reliability, ESD, and thermal performance requirements for under-hood and safety-critical vehicle systems.
Can the MAX16997AAUA/V+ be used with a 3.3V microcontroller?
Yes-the MAX16997AAUA/V+ supports 3.3V microcontrollers via its WDI input (TTL/CMOS compatible, VIH = 2.25V min) and ENABLE output (open-drain, compatible with 2.5V–28V pull-ups). To drive WDI, ensure the MCU's falling edge meets tWDImin ≥ 6.5µs and VIL ≤ 0.9V. For ENABLE, use a 3.3V pull-up resistor (e.g., 10kΩ) to interface directly with 3.3V logic inputs.
MAX16997AAUA/V+ 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX16997AAUA/V+ FAQ
1.How can I place an order for MAX16997AAUA/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16997AAUA/V+ 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/V+ reliable?
The price and inventory of MAX16997AAUA/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16997AAUA/V+ is usually 5 days.
3.What payment methods are accepted for MAX16997AAUA/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16997AAUA/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16997AAUA/V+?
MAX16997AAUA/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16997AAUA/V+ 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/V+?
For technical support, including MAX16997AAUA/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16997AAUA/V+ requirements.
6.How does Aetrix verify that MAX16997AAUA/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16997AAUA/V+ 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/V+ meets industry standards.
7.What is the process for return or replacement of MAX16997AAUA/V+?
All MAX16997AAUA/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16997AAUA/V+, 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/V+ part is unused and in its original packaging.
Return procedure for MAX16997AAUA/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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