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Analog Devices Inc./Maxim Integrated MAX16998BAUA/V+
- Part No.:
- MAX16998BAUA/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX16998BAUA/V+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,029
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Product details
Overview
MAX16998BAUA/V+ from Maxim Integrated is an AEC-Q100 qualified automotive supervisory IC that provides dual open-drain outputs (RESET and ENABLE) for microprocessor monitoring in high-voltage systems. It features a 5V–40V input range, 18μA quiescent current at +125°C, capacitor-adjustable reset timeout (1ms–116ms), and a factory-set 50% windowed watchdog timer with 12ms typical timeout. It is used in engine control units to detect software hangs and trigger fail-safe switchover.
For engineers reviewing the MAX16998BAUA/V+ datasheet, MAX16998BAUA/V+ pinout, MAX16998BAUA/V+ application, or MAX16998BAUA/V+ equivalent, key selection considerations include its 50% window watchdog architecture, RESETIN voltage monitoring capability, -40°C to +125°C operation, μMAX® 8-pin package, and automotive qualification per AEC-Q100.
Technical Context
The MAX16998BAUA/V+ implements a windowed watchdog timer with fixed 50% open-window ratio relative to the adjustable watchdog timeout period (tWP), enabling detection of both early and late WDI transitions. Its RESETIN comparator monitors external supply rails via a resistive divider, asserting RESET when voltage falls below 1.235V (±120mV over temperature).
It uses precision internal ramp currents (IRAMP_SRT = 500nA typ, IRAMP_SWT = 500nA typ) to generate timing intervals from external capacitors on SRT and SWT pins. The device supports power-on/power-off reset sequencing with tRRDL < 1µs delay from RESETIN fall to RESET assertion and guarantees correct ENABLE logic state for VIN > 1.1V.
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 ECU sleep modes. |
| Reset Timeout Range | 1ms to 116ms - set by 390pF–47nF capacitor on SRT pin; ensures reliable µP initialization across diverse boot sequences. |
| Watchdog Timeout | 6.8ms to 217ms - set by 680pF–22nF capacitor on SWT pin; supports flexible firmware servicing intervals. |
| Window Size | 50% of tWP - factory-trimmed for MAX16998B variant; detects both premature and delayed WDI edges to catch timing violations. |
| RESET Output Voltage Rating | 18V max - allows pull-up to 12V or 14V system rails while maintaining TTL/CMOS compatibility. |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive environments per AEC-Q100 Grade 0. |
Pinout & Package
MAX16998BAUA/V+ is housed in an 8-pin lead(Pb)-free μMAX® package (3mm × 3mm, 0.5mm pitch), optimized for space-constrained automotive PCB layouts and qualified for reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Power-supply input | Bypassed to GND with 0.1µF ceramic; accepts 5V–40V unregulated battery input. |
| 2 RESETIN | Reset threshold monitor input | High-impedance node for external resistive divider; triggers RESET when V<1.235V. |
| 3 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; sets tWP via external capacitor to GND. |
| 5 GND | Ground reference | Primary return path for all internal circuits; requires low-inductance connection to system ground plane. |
| 6 WDI | Watchdog input | Accepts falling-edge-triggered pulses ≥6.5µs wide; immune to sub-1µs noise. |
| 7 SRT | Reset timeout adjustment | Connects to precision 500nA current source; sets tRESET via external capacitor to GND. |
| 8 ENABLE | Open-drain enable output | Asserts low after three consecutive WDI faults; requires external pull-up to 2.5V–28V rail. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable timing | Independent SRT and SWT pins enable precise, board-level tuning of reset and watchdog timeouts without firmware changes. |
| 50% windowed watchdog | Factory-set window eliminates ambiguity in WDI timing margins-detects both early and late faults missed by standard timeout-only watchdogs. |
| Car battery-compatible EN/RESETIN | Inputs tolerate -0.3V to +20V and support direct connection to 12V/24V systems via resistive dividers without level-shifting. |
| AEC-Q100 Grade 0 qualification | Validated for -40°C to +125°C operation with full electrical testing across temperature and life stress conditions. |
| TTL/CMOS-compatible open-drain outputs | RESET and ENABLE drive standard logic families; RESET supports up to 18V pull-up, ENABLE up to 28V. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
Use Scenario: Monitors main MCU during cold cranking and transient load dump events where battery voltage dips below 6V or surges above 36V. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brown-out detection via RESETIN, and windowed watchdog supervision of safety-critical firmware loops. Use Value: Prevents undetected MCU lockup during voltage transients by asserting RESET within 1µs of RESETIN falling below 1.235V and triggering ENABLE after three consecutive WDI faults. |
Use Scenario: Ensures continuous operation of image processing SoC in rear-view camera systems exposed to thermal cycling and EMI. IC Role / Device Role / Timing Role: Dual-output supervisor generating synchronized RESET for SoC initialization and ENABLE for redundant processor activation upon fault detection. Use Value: Enables fail-operational behavior: ENABLE asserts to activate backup imaging path after three consecutive WDI timing violations detected by the 50%-window watchdog. |
| Body Control Module (BCM) | Electric Power Steering (EPS) Controller |
Use Scenario: Manages wake-up sequencing and diagnostic readiness in always-on BCMs powered directly from vehicle battery. IC Role / Device Role / Timing Role: Low-quiescent-current (18μA) supervisor enabling persistent monitoring during sleep mode while supporting fast wake-up reset propagation. Use Value: Guarantees correct ENABLE logic state for VIN > 1.1V, allowing safe operation even during deep battery discharge down to 5V minimum operating voltage. |
Use Scenario: Provides functional safety monitoring for torque-control MCU in ISO 26262 ASIL-B compliant EPS systems. IC Role / Device Role / Timing Role: AEC-Q100 qualified watchdog timer with windowed detection to satisfy ASIL-B diagnostic coverage requirements for timing faults. Use Value: Detects both stuck-at-high and stuck-at-low WDI failures via 50% window, improving fault coverage beyond standard timeout-based watchdogs required for ASIL-B. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16998DAUA/V+ | 75% window size vs. 50%; otherwise identical pinout, timing architecture, and specs. | Better suited for applications requiring wider timing tolerance (e.g., variable-loop firmware) but less sensitive to early faults. | Select MAX16998DAUA/V+ when broader WDI window improves robustness against jitter without compromising late-fault detection. |
| TLV809EADBZR | Single-output (RESET only), no watchdog, 3.0V fixed threshold, 1.8–6.0V supply, no windowing. | Limited to basic power-monitoring applications; lacks ENABLE output and programmable timing. | Choose TLV809EADBZR only for cost-sensitive, non-safety-critical subsystems where watchdog functionality is unnecessary. |
Compared with MAX16998BAUA/V+, the MAX16998DAUA/V+ offers higher window tolerance for variable firmware execution, while the TLV809EADBZR provides minimal reset supervision without timing supervision-making MAX16998BAUA/V+ the only option meeting ASIL-B windowed watchdog requirements in this family.
Availability
MAX16998BAUA/V+ is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera modules, and electric power steering systems requiring stable component supply across extended temperature and lifecycle demands.
Supply support for MAX16998BAUA/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 and mixed-signal ICs for automotive, industrial, and communications applications with emphasis on reliability and integration.
The MAX16997/MAX16998 product line delivers high-voltage, low-quiescent-current supervisory solutions specifically engineered for automotive microprocessor monitoring, including windowed watchdogs and redundant enable signaling for functional safety systems.
FAQ
What is the watchdog window size for MAX16998BAUA/V+?
The MAX16998BAUA/V+ features a factory-set 50% windowed watchdog timer, meaning the open window width equals 50% of the total watchdog timeout period (tWP). This architecture detects both early (within closed window) and late (beyond tWP) WDI transitions, significantly improving fault coverage over standard timeout-only watchdogs. The window size is fixed and not user-adjustable.
How does MAX16998BAUA/V+ handle power-up sequencing?
During power-up, MAX16998BAUA/V+ asserts RESET low once VIN exceeds 1.1V. RESET remains low until RESETIN rises above its 1.235V threshold, then starts the tRESET timer. After tRESET expires, RESET goes high-ensuring the monitored LDO or MCU supply is fully settled before release. This sequence meets automotive cold-cranking requirements with guaranteed timing behavior.
Can MAX16998BAUA/V+ monitor multiple voltage rails?
No-MAX16998BAUA/V+ monitors only one external voltage rail via the RESETIN pin, using an external resistive divider to set the trip point. It does not support multi-rail monitoring. For systems requiring supervision of multiple supplies, multiple MAX16998BAUA/V+ devices or a dedicated multi-channel supervisor like the MAX16052 would be required.
What is the maximum allowable voltage on the RESET output pin?
The RESET output of MAX16998BAUA/V+ is rated for a maximum of 18V. This allows direct connection to common automotive logic rails (e.g., 12V or 14V) via an external pull-up resistor, while maintaining TTL/CMOS compatibility. Exceeding 18V risks damage to the open-drain structure and violates absolute maximum ratings.
Is MAX16998BAUA/V+ pin-compatible with other variants in the MAX16998 family?
Yes-MAX16998BAUA/V+ shares identical 8-pin μMAX® pinout and footprint with all MAX16998x variants (A, B, D) and MAX16997A. This enables drop-in replacement across the family for design reuse, though functional differences (e.g., window size, ENABLE presence) require firmware and system-level validation before substitution.
MAX16998BAUA/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:
- Obsolete
- 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
MAX16998BAUA/V+ FAQ
1.How can I place an order for MAX16998BAUA/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16998BAUA/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 MAX16998BAUA/V+ reliable?
The price and inventory of MAX16998BAUA/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16998BAUA/V+ is usually 5 days.
3.What payment methods are accepted for MAX16998BAUA/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16998BAUA/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16998BAUA/V+?
MAX16998BAUA/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16998BAUA/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 MAX16998BAUA/V+?
For technical support, including MAX16998BAUA/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16998BAUA/V+ requirements.
6.How does Aetrix verify that MAX16998BAUA/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16998BAUA/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 MAX16998BAUA/V+ meets industry standards.
7.What is the process for return or replacement of MAX16998BAUA/V+?
All MAX16998BAUA/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16998BAUA/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 MAX16998BAUA/V+ part is unused and in its original packaging.
Return procedure for MAX16998BAUA/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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