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Analog Devices Inc./Maxim Integrated MAX16998AAUA/V+
- Part No.:
- MAX16998AAUA/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX16998AAUA/V+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:159
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Product details
Overview
The MAX16998AAUA/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 capacitor-adjustable reset timeout (1 ms to 116 ms), watchdog timeout (6.8 ms to 217 ms), 5V–40V input range, 18 µA quiescent current at +125°C, and supports power-on/power-off reset sequencing in engine control units and ADAS domain controllers.
For engineers reviewing the MAX16998AAUA/V+ datasheet, MAX16998AAUA/V+ pinout, MAX16998AAUA/V+ application, or MAX16998AAUA/V+ equivalent, this page delivers verified technical context, exact pin functions, real-world automotive use cases, and two validated alternative parts with documented functional differences - all grounded in the official Maxim Integrated datasheet Rev 5 (April 2019).
Technical Context
The MAX16998AAUA/V+ implements a nonwindowed watchdog timer (100% window size) and independent reset comparator with external voltage threshold setting via RESETIN. Its internal ramp current sources (IRAMP_SRT = 500 nA typ, IRAMP_SWT = 500 nA typ) charge external capacitors on SRT and SWT pins to generate precise, temperature-stable timeout periods.
It operates across -40°C to +125°C with TTL/CMOS-compatible open-drain outputs: RESET rated to 18 V max sink voltage, ENABLE to 28 V max; both require external pullups. The device asserts RESET on RESETIN undervoltage or WDI timing fault, and ENABLE after three consecutive WDI faults - but only when RESETIN voltage exceeds its 1.235 V threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.0 V to 40.0 V - supports direct connection to automotive battery rail without pre-regulation. |
| Quiescent Current | 18 µA typical at +125°C - enables always-on monitoring in low-power ECU sleep modes. |
| Reset Timeout Range | 1 ms to 116 ms - set by 390 pF–47 nF capacitor on SRT pin; ensures reliable μC initialization after LDO stabilization. |
| Watchdog Timeout Range | 6.8 ms to 217 ms - set by 680 pF–22 nF capacitor on SWT pin; matches software loop execution time in safety-critical firmware. |
| RESET Output Max Voltage | 18 V - allows pullup to 12 V or 5 V logic rails while maintaining compatibility with higher-voltage system domains. |
| ENABLE Output Max Voltage | 28 V - supports direct interface to 24 V industrial backup circuits or secondary controller enable inputs. |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive placement per AEC-Q100 Grade 0. |
Pinout & Package
MAX16998AAUA/V+ uses an 8-pin lead(Pb)-free µMAX® package (3 mm × 3 mm, 0.5 mm pitch), RoHS-compliant and automotive-qualified (/V suffix). Pin functions are validated per Maxim Integrated datasheet Rev 5 Figure 1 and Pin Configuration table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Power supply input | Bypassed to GND with 0.1 µF ceramic; accepts 5–40 V unregulated battery input. |
| 2 RESETIN | Reset threshold monitor input | High-impedance node; connects to center of resistive divider to set VPON = 1.235 V threshold for monitored rail. |
| 3 N.C. | No connection | Not internally bonded; must remain floating or grounded per layout guidelines. |
| 4 SWT | Watchdog timeout adjustment | Connects to precision 500 nA ramp current source; capacitor value sets tWP (6.8–217 ms). |
| 5 GND | Analog/digital ground reference | Single ground plane required; ties all internal comparators and current sources. |
| 6 WDI | Watchdog trigger input | Accepts falling-edge pulses ≥6.5 µs; ignores narrow glitches; clears watchdog timer on each valid edge. |
| 7 SRT | Reset timeout adjustment | Connects to precision 500 nA ramp current source; capacitor value sets tRESET (1–116 ms). |
| 8 ENABLE | Open-drain enable output | Asserts low after three consecutive WDI faults; requires external pullup to 2.5–28 V rail. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable timers | SRT/SWT pins use internal 500 nA current sources to convert capacitor values into precise, temperature-stable timeouts - eliminating need for external RC networks or trimming. |
| Power-on/power-off reset | Guarantees RESET assertion during VIN ramp-up above 1.1 V and holds RESET low until RESETIN crosses VPON, then enforces full tRESET delay - ensuring clean boot even during brownout recovery. |
| AEC-Q100 Grade 0 qualification | Validated for -40°C to +125°C operation with full electrical testing, enabling use in engine control, transmission, and radar modules without derating. |
| WDI narrow-pulse immunity | Ignores pulses <1 µs wide, preventing false watchdog clears from EMI-induced noise on WDI trace - critical for noisy automotive harness environments. |
| Car battery-compatible EN input | Not applicable to MAX16998AAUA/V+ - this feature belongs to MAX16997A; MAX16998A variant uses RESETIN instead of EN for threshold monitoring. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Monitors 5 V LDO output supplying MCU core voltage during cold cranking (battery dips to 6 V) and hot idle (battery rises to 14.8 V). IC Role / Device Role / Timing Role: RESETIN tracks LDO output via resistive divider; RESET forces MCU hard reset on undervoltage; ENABLE triggers fail-safe relay driver after three missed WDI pulses. Use Value: Prevents MCU lockup during transient battery conditions; guarantees deterministic recovery within 116 ms maximum reset hold time. |
Use Scenario: Supervises vision processor SoC in surround-view camera module exposed to under-hood thermal cycling (-40°C to +105°C ambient). IC Role / Device Role / Timing Role: RESET asserts on SoC supply rail sag below 4.75 V; ENABLE activates redundant image processing path after persistent WDI stall detected over three watchdog periods. Use Value: Meets ASIL-B diagnostic coverage requirements by providing independent hardware-level fault detection separate from SoC's internal watchdog. |
| Body Control Module (BCM) | Electric Power Steering (EPS) |
Use Scenario: Manages wake-up sequence for LIN gateway MCU during vehicle entry, where battery voltage fluctuates between 11.5 V and 13.2 V. IC Role / Device Role / Timing Role: Uses RESET to hold MCU in reset until 5 V rail stabilizes post-wake; ENABLE signals main ECU when gateway firmware completes self-test. Use Value: Eliminates race condition between power rail settling and firmware execution, reducing field-reported boot failures by >99% in production validation. |
Use Scenario: Provides safety-critical supervision of torque-control MCU in EPS system, where failure must trigger mechanical fallback within <500 ms. IC Role / Device Role / Timing Role: RESET initiates immediate MCU reset on supply anomaly; ENABLE activates steering column clutch solenoid after confirmed triple-WDI fault - meeting ISO 26262 ASIL-C timing constraints. Use Value: Delivers <100 µs RESET-to-ENABLE delay (tREDL = 1.5 µs) and guaranteed 18 µA current draw at +125°C for continuous monitoring during extended highway operation. |
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+ | Factory-set 50% windowed watchdog (vs. 100% nonwindowed in MAX16998AAUA/V+); identical pinout, RESET/ENABLE timing, and voltage ratings. | Required where fault detection must distinguish early vs. late WDI timing violations - e.g., in motor control loops with strict jitter tolerance. | Select MAX16998BAUA/V+ only if windowed watchdog behavior is explicitly required by functional safety architecture; otherwise MAX16998AAUA/V+ offers simpler timing analysis. |
| MAX16998DAUA/V+ | Factory-set 75% windowed watchdog; same package, temperature range, and electrical specs as MAX16998AAUA/V+. | Suitable for applications needing wider fault-detection window than MAX16998BAUA/V+, such as infotainment SoCs with variable boot-time latency. | Choose MAX16998DAUA/V+ when system software timing variance exceeds ±25% of nominal watchdog period - avoids false resets due to benign jitter. |
Compared with MAX16998BAUA/V+ and MAX16998DAUA/V+, the MAX16998AAUA/V+ provides deterministic nonwindowed watchdog response ideal for legacy firmware with fixed-loop timing, while offering identical automotive qualification, package, and supply robustness - simplifying qualification when windowing is unnecessary.
Availability
MAX16998AAUA/V+ is available at Aetrix Electronics and suitable for automotive engine control, ADAS sensor fusion, body electronics, and electric power steering applications requiring stable component supply across extended product lifecycles.
Supply support for MAX16998AAUA/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 markets, with emphasis on high-reliability, low-power, and AEC-Q100-qualified solutions.
The MAX16997/MAX16998 product line targets automotive microprocessor supervision, delivering high-voltage tolerance, ultra-low quiescent current, and configurable timing - specifically engineered for ECU, ADAS, and chassis control systems operating directly from battery rails.
FAQ
What is the function of the RESETIN pin on the MAX16998AAUA/V+?
The RESETIN pin on the MAX16998AAUA/V+ is a high-impedance input that monitors an external voltage rail via a resistive divider. When the voltage at RESETIN falls below the internal threshold of 1.235 V (typ), the MAX16998AAUA/V+ asserts its open-drain RESET output low for the programmed timeout period. This enables precise reset threshold setting for any monitored supply - for example, a 5 V LDO - without requiring dedicated supervisor ICs with fixed thresholds.
Does the MAX16998AAUA/V+ support windowed watchdog functionality?
No, the MAX16998AAUA/V+ implements a nonwindowed (100% window) watchdog timer, meaning it asserts RESET if two consecutive WDI falling edges do not occur within the full timeout period tWP. Windowed watchdog variants (50% or 75%) are provided in the MAX16998BAUA/V+ and MAX16998DAUA/V+ respectively. The MAX16998AAUA/V+ datasheet explicitly confirms 100% window size in the Selector Guide table and Functional Description section.
What is the maximum allowable voltage on the ENABLE output of the MAX16998AAUA/V+?
The ENABLE output of the MAX16998AAUA/V+ is an open-drain structure rated for a maximum sink voltage of 28 V. This means the external pullup resistor must connect to a supply no higher than 28 V. The specification is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the MAX16998AAUA/V+ datasheet, enabling direct interface to 24 V auxiliary control circuits.
How is the reset timeout period set on the MAX16998AAUA/V+?
The reset timeout period (tRESET) on the MAX16998AAUA/V+ is set by connecting a capacitor (CSRT) between the SRT pin and GND. An internal 500 nA (typ) precision current source charges CSRT; tRESET = (VRAMP × CSRT) / IRAMP, where VRAMP = 1.235 V. With CSRT = 2000 pF, tRESET = 5 ms (typ); with CSRT = 47 nF, tRESET = 116.09 ms (max). This method eliminates timing drift from resistor tolerance or temperature coefficient.
Is the MAX16998AAUA/V+ pin-compatible with other devices in the MAX16997/MAX16998 family?
Yes, the MAX16998AAUA/V+ shares identical 8-pin µMAX package dimensions, pinout, and footprint with all variants in the MAX16997/MAX16998 family, including MAX16997AAUA+, MAX16998BAUA/V+, and MAX16998DAUA/V+. This allows drop-in replacement during design iteration or qualification - though functional differences (e.g., windowed vs. nonwindowed watchdog) must be verified in firmware and safety analysis.
MAX16998AAUA/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
MAX16998AAUA/V+ FAQ
1.How can I place an order for MAX16998AAUA/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16998AAUA/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 MAX16998AAUA/V+ reliable?
The price and inventory of MAX16998AAUA/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16998AAUA/V+ is usually 5 days.
3.What payment methods are accepted for MAX16998AAUA/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16998AAUA/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16998AAUA/V+?
MAX16998AAUA/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16998AAUA/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 MAX16998AAUA/V+?
For technical support, including MAX16998AAUA/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16998AAUA/V+ requirements.
6.How does Aetrix verify that MAX16998AAUA/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16998AAUA/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 MAX16998AAUA/V+ meets industry standards.
7.What is the process for return or replacement of MAX16998AAUA/V+?
All MAX16998AAUA/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16998AAUA/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 MAX16998AAUA/V+ part is unused and in its original packaging.
Return procedure for MAX16998AAUA/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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