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Analog Devices Inc./Maxim Integrated MAX16998DAUA/V+
- Part No.:
- MAX16998DAUA/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX16998DAUA/V+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:188
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Product details
Overview
MAX16998DAUA/V+ from Maxim Integrated is an automotive-grade high-voltage microprocessor supervisory IC with windowed watchdog timer and dual open-drain outputs (RESET and ENABLE). It operates from 5V to 40V input, draws only 18µA typical quiescent current at +125°C, features capacitor-adjustable reset timeout (1ms–116ms) and watchdog timeout (6.8ms–217ms), and supports 75% windowed watchdog detection for enhanced fault discrimination in safety-critical systems.
For engineers reviewing the MAX16998DAUA/V+ datasheet, MAX16998DAUA/V+ pinout, MAX16998DAUA/V+ application, or MAX16998DAUA/V+ equivalent, key selection considerations include its AEC-Q100 qualification, -40°C to +125°C operation, 75% factory-set watchdog window size, RESETIN voltage monitoring capability, and compatibility with 2.5V–18V pull-up for RESET and 2.5V–28V for ENABLE.
Technical Context
The MAX16998DAUA/V+ implements a precision windowed watchdog architecture where the watchdog timeout period (tWP) is split into a closed window (tCW) and open window (tOW), with tOW = 75% × tWP. A WDI falling edge within tCW triggers immediate RESET assertion; one within tOW is accepted as valid; no edge within tWP causes late-fault RESET.
It integrates independent reset and watchdog timing paths: SRT sets tRESET via external capacitor (IRAMP_SRT = 500nA typ, VRAMP = 1.235V); SWT sets tWP (IRAMP_SWT = 500nA typ); RESETIN threshold is fixed at 1.235V (±120mV over temp); and ENABLE asserts only after three consecutive WDI faults - but only if RESETIN voltage remains above threshold.
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 Window Size | 75% of tWP - factory-configured for MAX16998D variant to detect both early and late software execution faults. |
| Reset Timeout Range | 1ms to 116ms - adjustable via 390pF–47nF capacitor on SRT pin for µP power-on sequencing compliance. |
| WDI Pulse Immunity | Rejects pulses < 1µs - prevents false watchdog clears from noise or EMI on control line. |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive environments per AEC-Q100 Grade 0. |
| RESET Output Voltage Rating | 18V max - allows pull-up to higher-voltage logic domains (e.g., 12V system rails). |
| ENABLE Output Voltage Rating | 28V max - supports direct interface to 24V industrial enable inputs or backup controller supplies. |
Pinout & Package
MAX16998DAUA/V+ is housed in an 8-pin lead(Pb)-free µMAX® package (3mm × 3mm, 0.5mm pitch), RoHS-compliant and qualified for automotive use.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Power supply input | Bypass with 0.1µF capacitor; accepts 5V–40V unregulated automotive battery input. |
| 2 - | No connection | Not internally connected; must be left floating or tied to GND (no electrical function). |
| 3, 7 N.C. | No connection | Unbonded pins; no internal connection - PCB pads may be omitted or grounded for thermal relief. |
| 4 SWT | Watchdog timeout adjustment | Connect capacitor to GND to set tWP; shorting to GND disables watchdog function entirely. |
| 5 GND | Ground reference | Primary return path for all internal circuits; requires low-impedance connection to system ground plane. |
| 6 WDI | Watchdog trigger input | High-impedance CMOS/TTL-compatible input; falling edge resets watchdog timer; narrow-pulse immune. |
| 8 ENABLE | Open-drain enable output | Asserts low after three consecutive WDI faults; requires external pull-up to 2.5V–28V supply. |
| - RESETIN | Reset input monitor | High-Z comparator input referenced to 1.235V; connect via resistive divider to monitor LDO or MCU supply. |
| - SRT | Reset timeout adjustment | Connect capacitor to GND to set tRESET; timing determined by 500nA ramp current and 1.235V threshold. |
| - RESET | Open-drain reset output | Asserts low on RESETIN undervoltage or WDI fault; requires external pull-up to 2.5V–18V supply. |
Key Features
| Feature | Design Value |
|---|---|
| 75% windowed watchdog | Factory-set tOW = 75% × tWP enables detection of both premature and delayed WDI transitions - critical for ISO 26262 ASIL-B/C diagnostics. |
| Capacitor-adjustable timing | Independent SRT/CSRT and SWT/CSWT networks allow precise, board-level tuning of reset and watchdog timeouts without firmware changes. |
| AEC-Q100 Grade 0 qualification | Validated for -40°C to +125°C operation with full parametric testing - meets automotive functional safety infrastructure requirements. |
| High-voltage open-drain outputs | RESET rated to 18V, ENABLE to 28V - eliminates level-shifting components when interfacing with 12V/24V system controllers or backup modules. |
| Low quiescent current | 18µA typical at +125°C - sustains reliable supervision during extended vehicle sleep modes without draining battery. |
| WDI narrow-pulse immunity | Ignores pulses < 1µs - suppresses EMI-induced glitches on long harness runs without requiring external RC filtering. |
Applications
| Engine Control Unit (ECU) Supervision | ADAS Domain Controller Watchdog |
|---|---|
|
Use Scenario: Monitors main MCU supply (e.g., 3.3V LDO output) and software heartbeat in gasoline/diesel engine control units. IC Role / Device Role / Timing Role: Resets MCU on supply droop or software hang; asserts ENABLE to initiate fail-safe shutdown or limp-home mode after three consecutive faults. Use Value: Prevents unsafe engine operation due to undetected firmware lockup; 75% watchdog window detects both stuck-loop and timing-skew faults. |
Use Scenario: Supervises vision processor and sensor fusion MCU in forward collision warning or lane-keeping systems. IC Role / Device Role / Timing Role: Generates RESET pulse on VDD undervoltage; uses ENABLE to signal redundant controller to assume control upon persistent WDI failure. Use Value: Enables ASIL-D decomposition by providing hardware-enforced diagnostic coverage for software execution integrity. |
| Automotive Body Control Module (BCM) | Electric Power Steering (EPS) Safety Monitor |
|
Use Scenario: Ensures reliable startup and runtime supervision of LIN gateway and door module MCUs in 12V body electronics. IC Role / Device Role / Timing Role: Uses RESETIN to monitor 5V system rail; asserts RESET during cold-cranking dips; ENABLE triggers fallback to mechanical steering assist logic. Use Value: Maintains functional safety during battery transients; 5V–40V input range survives load-dump events up to 40V. |
Use Scenario: Provides independent hardware watchdog for torque-control MCU in steer-by-wire EPS systems. IC Role / Device Role / Timing Role: Watches WDI from primary controller; asserts RESET on fault; ENABLE activates secondary controller to maintain safe torque limits. Use Value: Meets ISO 26262 ASIL-C requirements via dual-output fault signaling and deterministic 75% windowed timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16998BAUA/V+ | 50% watchdog window (vs. 75%); otherwise identical pinout, timing architecture, and specs. | Suitable for systems requiring tighter fault detection window - e.g., real-time control loops with strict jitter budgets. | Select MAX16998BAUA/V+ when earlier fault detection is prioritized over tolerance to minor timing variations. |
| TLV809EADBZR | Single-channel reset IC only; no watchdog or ENABLE output; 3.0V–6.0V input; no windowed watchdog. | Limited to basic power-on reset in non-safety-critical 3.3V/5V applications; lacks redundancy signaling capability. | Choose TLV809EADBZR only for cost-sensitive, non-automotive designs where watchdog supervision is handled separately. |
Compared with MAX16998BAUA/V+, the MAX16998DAUA/V+ provides broader fault coverage via its 75% watchdog window, making it preferable for complex ADAS or EPS systems where both early and late software faults must be distinguished. Compared with TLV809EADBZR, it delivers integrated dual-output supervision essential for automotive fail-operational architectures.
Availability
MAX16998DAUA/V+ is available at Aetrix Electronics and suitable for automotive ECU design, ADAS domain controller development, and electric power steering safety monitoring requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for MAX16998DAUA/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 product line delivers high-voltage, low-quiescent-current supervisory solutions specifically engineered for automotive microprocessor reliability - emphasizing AEC-Q100 compliance, wide input range, and configurable watchdog timing.
FAQ
What is the watchdog window configuration of the MAX16998DAUA/V+?
The MAX16998DAUA/V+ features a factory-set 75% windowed watchdog timer, meaning the open window (tOW) occupies 75% of the total watchdog timeout period (tWP), while the closed window (tCW) occupies the remaining 25%. This configuration allows detection of both early (within tCW) and late (beyond tWP) WDI transitions - a key requirement for ISO 26262-compliant fault detection in the MAX16998DAUA/V+.
Does the MAX16998DAUA/V+ support direct connection to a 24V supply rail?
No - the MAX16998DAUA/V+ has a maximum input voltage rating of 40V on the IN pin, but its ENABLE output is rated for up to 28V pull-up, and RESET up to 18V. While the device itself can tolerate 24V on IN, the ENABLE output must be pulled up to ≤28V and RESET to ≤18V. For 24V system interfaces, ENABLE may connect directly; RESET requires a level-shifter or Zener clamp if pulled to 24V.
How is the reset timeout period adjusted on the MAX16998DAUA/V+?
The reset timeout period (tRESET) of the MAX16998DAUA/V+ is set by connecting an external capacitor (CSRT) between the SRT pin and GND. With a typical ramp current of 500nA and threshold voltage of 1.235V, tRESET = (CSRT × 1.235V) / 500nA. For example, a 2000pF capacitor yields ~5ms tRESET. The MAX16998DAUA/V+ datasheet provides curves and equations for precise selection.
Can the MAX16998DAUA/V+ monitor multiple voltage rails simultaneously?
No - the MAX16998DAUA/V+ monitors only one external voltage rail via the RESETIN pin using an external resistive divider. It does not support multi-rail monitoring. However, its wide 5V–40V input range and high-impedance RESETIN input (leakage < 0.1µA) allow flexible scaling to monitor 3.3V, 5V, or 12V supplies with appropriate resistor ratios - all within a single MAX16998DAUA/V+ device.
Is the MAX16998DAUA/V+ pin-compatible with other variants in the MAX16997/MAX16998 family?
Yes - all MAX16997/MAX16998 variants, including MAX16998DAUA/V+, share identical 8-pin µMAX package pinouts and electrical interface. The functional differences (e.g., 75% vs. 50% watchdog window, presence of RESETIN vs. EN) are implemented internally; no PCB layout change is required when substituting within the same package variant (e.g., MAX16998DAUA/V+ ↔ MAX16998BAUA/V+).
MAX16998DAUA/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
MAX16998DAUA/V+ FAQ
1.How can I place an order for MAX16998DAUA/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16998DAUA/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 MAX16998DAUA/V+ reliable?
The price and inventory of MAX16998DAUA/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16998DAUA/V+ is usually 5 days.
3.What payment methods are accepted for MAX16998DAUA/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16998DAUA/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16998DAUA/V+?
MAX16998DAUA/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16998DAUA/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 MAX16998DAUA/V+?
For technical support, including MAX16998DAUA/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16998DAUA/V+ requirements.
6.How does Aetrix verify that MAX16998DAUA/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16998DAUA/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 MAX16998DAUA/V+ meets industry standards.
7.What is the process for return or replacement of MAX16998DAUA/V+?
All MAX16998DAUA/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16998DAUA/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 MAX16998DAUA/V+ part is unused and in its original packaging.
Return procedure for MAX16998DAUA/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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