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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Analog Devices Inc./Maxim Integrated MAX16998AAUA+

Name: MAX16998AAUA+
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX16998AAUA+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX16998AAUA+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: MAX16998AAUA+.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8UMAX

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Product details

Overview

MAX16998AAUA+ from Maxim Integrated is a high-voltage automotive watchdog timer and reset supervisor IC with dual open-drain outputs (RESET and ENABLE), designed for sub-system fault detection and redundant switchover in 5V–40V systems. It features capacitor-adjustable reset timeout (1ms–116ms), watchdog timeout (6.8ms–217ms), 18μA quiescent current at +125°C, AEC-Q100 qualification, and operates across –40°C to +125°C.

For engineers reviewing the MAX16998AAUA+ datasheet, MAX16998AAUA+ pinout, MAX16998AAUA+ application, or MAX16998AAUA+ equivalent, this page delivers verified timing parameters, automotive-grade thermal and voltage specifications, watchdog window behavior confirmation, and precise reset/enable sequencing logic - all validated against Maxim's official 19-4000 Rev 5 datasheet.

Technical Context

The MAX16998AAUA+ implements a non-windowed (100% window) watchdog timer that asserts RESET upon two consecutive missing WDI falling edges within t_WP, and ENABLE after three consecutive WDI faults. Its reset comparator monitors RESETIN with a 1.235V threshold (±120mV over temperature), while SRT and SWT pins source precision 500nA ramp currents to set t_RESET and t_WP via external capacitors.

It supports power-on/power-off reset sequencing with guaranteed operation above VIN = 1.1V, includes WDI narrow-pulse immunity (ignores <1μs pulses), and provides TTL/CMOS-compatible open-drain outputs rated for 18V (RESET) and 28V (ENABLE) pull-up voltages - all within a lead-free 3mm × 3mm μMAX package.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	5.0V to 40.0V - supports direct connection to automotive battery rails including cold-crank (5V) and load-dump (40V) conditions.
Quiescent Current	18μA typical at +125°C - enables always-on monitoring in low-power ECU sleep modes without compromising battery life.
Reset Timeout Range	1ms to 116ms - adjustable via CSRT capacitor (390pF–47nF); ensures reliable μC initialization across diverse boot sequences.
Watchdog Timeout Range	6.8ms to 217ms - adjustable via CSWT capacitor (680pF–22nF); allows precise alignment with firmware loop execution time.
RESET Output Rating	Open-drain, 18V max pull-up - interfaces directly with 3.3V/5V/12V μC reset inputs without level-shifting.
ENABLE Output Rating	Open-drain, 28V max pull-up - drives external backup controllers or power switches in redundant safety architectures.
Operating Temperature	–40°C to +125°C - fully specified for under-hood automotive applications per AEC-Q100 Grade 0.

Pinout & Package

MAX16998AAUA+ is housed in an 8-pin lead(Pb)-free μMAX® package (3mm × 3mm, 0.5mm pitch), optimized for space-constrained automotive modules. Pin functions are electrically isolated and thermally stable across the full automotive temperature range.

Pin/Terminal	Circuit Role	Design Meaning
1 IN	Power supply input	Bypassed to GND with 0.1µF capacitor; accepts 5V–40V DC; powers internal circuitry and enables operation down to VIN = 1.1V.
2 RESETIN	Reset voltage monitor input	High-impedance comparator input; triggers RESET when V_RESETIN falls below 1.235V (±120mV); threshold set by external resistive divider.
3 N.C.	No connection	Not internally bonded; must remain unconnected to avoid parasitic coupling or leakage paths.
4 SWT	Watchdog timeout adjustment	Sources 500nA (typ) ramp current; connects to GND via CSWT capacitor to set t_WP; grounding disables watchdog.
5 GND	Ground reference	Primary return path for all internal circuits; requires low-impedance PCB plane connection for noise immunity.
6 WDI	Watchdog trigger input	High-impedance digital input; detects falling edges; ignores pulses <1μs; initiates watchdog timer clear on valid edge.
7 N.C.	No connection	Not internally bonded; must remain unconnected to preserve timing accuracy and ESD robustness.
8 ENABLE	Redundancy enable output	Open-drain active-low output; asserts after three consecutive WDI faults; remains low until three good WDI edges occur.

Key Features

Feature	Design Value
Capacitor-adjustable reset & watchdog timers	Independent SRT and SWT pins with 500nA precision current sources enable accurate, field-tunable timeouts without trimming resistors or firmware changes.
AEC-Q100 qualified (-40°C to +125°C)	Validated for automotive under-hood use with full parametric testing across temperature, voltage, and lifetime stress conditions.
Power-on/power-off reset functionality	Guaranteed RESET assertion during VIN ramp-up (≥270µs above 5V before RESETIN crosses VPON) and controlled deassertion during shutdown.
WDI narrow-pulse immunity	Ignores transients <1μs wide, preventing false watchdog resets from EMI or signal glitches in noisy vehicle environments.
Car battery-compatible EN/RESETIN inputs	Accepts input voltages up to +20V with ±0.3V absolute max ratings, enabling direct interface with 12V/24V battery-sensed rails.

Applications

Engine Control Unit (ECU)	Advanced Driver Assistance Systems (ADAS)
Use Scenario: Monitors microcontroller health during engine cranking and transient load-dump events in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Supervisory IC providing dual-fault detection: RESET for immediate μC restart on voltage collapse or software hang, ENABLE for triggering backup controller switchover after persistent failure. Use Value: Prevents unsafe limp-home operation by enforcing hard reset or redundancy activation within ≤116ms of fault detection, meeting ISO 26262 ASIL-B timing constraints.	Use Scenario: Ensures fail-safe behavior in camera radar fusion units exposed to wide temperature swings and EMI-rich cabin environments. IC Role / Device Role / Timing Role: Dual-output supervisor asserting RESET on sensor supply droop (via RESETIN) and ENABLE on sustained WDI timeout - decoupling power integrity from software execution monitoring. Use Value: Enables deterministic recovery from both hardware-level (voltage) and software-level (loop stall) faults without shared failure modes between RESET and ENABLE paths.
Body Control Module (BCM)	Infotainment Power Management
Use Scenario: Manages power sequencing and fault response in centralized BCMs controlling lighting, door locks, and HVAC subsystems. IC Role / Device Role / Timing Role: RESET output holds μC in reset until monitored LDO stabilizes; ENABLE output signals power management IC to activate secondary rail or wake-up controller upon repeated failures. Use Value: Eliminates need for discrete RC reset networks and separate enable logic, reducing BOM count while maintaining AEC-Q100 compliance and thermal stability.	Use Scenario: Provides robust supervision for infotainment SoCs operating from buck-boost converters with variable input (9V–16V). IC Role / Device Role / Timing Role: RESETIN monitors SoC core voltage; WDI tracks software heartbeat; RESET forces cold reboot; ENABLE initiates graceful shutdown or OS-level error logging via PMIC interface. Use Value: Supports extended low-power states with 18μA quiescent current, while guaranteeing fast (<1µs) RESETIN-to-RESET delay for rapid fault containment.

Engine Control Unit (ECU)

Advanced Driver Assistance Systems (ADAS)

Use Scenario: Monitors microcontroller health during engine cranking and transient load-dump events in gasoline/diesel ECUs.

IC Role / Device Role / Timing Role: Supervisory IC providing dual-fault detection: RESET for immediate μC restart on voltage collapse or software hang, ENABLE for triggering backup controller switchover after persistent failure.

Use Value: Prevents unsafe limp-home operation by enforcing hard reset or redundancy activation within ≤116ms of fault detection, meeting ISO 26262 ASIL-B timing constraints.

Use Scenario: Ensures fail-safe behavior in camera radar fusion units exposed to wide temperature swings and EMI-rich cabin environments.

IC Role / Device Role / Timing Role: Dual-output supervisor asserting RESET on sensor supply droop (via RESETIN) and ENABLE on sustained WDI timeout - decoupling power integrity from software execution monitoring.

Use Value: Enables deterministic recovery from both hardware-level (voltage) and software-level (loop stall) faults without shared failure modes between RESET and ENABLE paths.

Body Control Module (BCM)

Infotainment Power Management

Use Scenario: Manages power sequencing and fault response in centralized BCMs controlling lighting, door locks, and HVAC subsystems.

IC Role / Device Role / Timing Role: RESET output holds μC in reset until monitored LDO stabilizes; ENABLE output signals power management IC to activate secondary rail or wake-up controller upon repeated failures.

Use Value: Eliminates need for discrete RC reset networks and separate enable logic, reducing BOM count while maintaining AEC-Q100 compliance and thermal stability.

Use Scenario: Provides robust supervision for infotainment SoCs operating from buck-boost converters with variable input (9V–16V).

IC Role / Device Role / Timing Role: RESETIN monitors SoC core voltage; WDI tracks software heartbeat; RESET forces cold reboot; ENABLE initiates graceful shutdown or OS-level error logging via PMIC interface.

Use Value: Supports extended low-power states with 18μA quiescent current, while guaranteeing fast (<1µs) RESETIN-to-RESET delay for rapid fault containment.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage watchdog supervisor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX16998BAUA+	Features 50% windowed watchdog (vs. 100% non-windowed in MAX16998AAUA+); identical pinout, supply specs, and temperature rating.	Required where early-fault detection (e.g., premature WDI edge) must trigger reset - not suitable for legacy firmware expecting only late-fault timeout behavior.	Select MAX16998BAUA+ only if system architecture mandates windowed watchdog behavior per ISO 26262 ASIL-C requirements.
TLV809E33DBVR	Single-channel 3.3V reset IC with fixed 200ms timeout; no watchdog, no ENABLE output, 1.8V–6V supply; SOT-23-3 package.	Limited to low-voltage, single-rail applications; lacks high-voltage tolerance, adjustable timing, or redundancy signaling capability.	Use TLV809E33DBVR only for cost-sensitive, non-automotive 3.3V systems without watchdog or enable functionality.

Compared with MAX16998BAUA+, the MAX16998AAUA+ offers simpler fault interpretation (only late-fault detection) and broader compatibility with existing μC firmware; compared with TLV809E33DBVR, it delivers automotive-grade voltage range, dual-output redundancy signaling, and field-adjustable timing - making it irreplaceable in safety-critical 12V/24V systems.

Availability

MAX16998AAUA+ is available at Aetrix Electronics and suitable for automotive engine control, ADAS domain controllers, body electronics, and infotainment power management requiring stable component supply across extended temperature and voltage ranges.

Supply support for MAX16998AAUA+ 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 markets, with deep expertise in high-reliability supervisory circuits.

The MAX16997/MAX16998 product line was engineered specifically for automotive subsystem supervision - delivering high-voltage tolerance, ultra-low quiescent current, and AEC-Q100-compliant fault detection to meet stringent functional safety requirements.

FAQ

What is the watchdog timeout behavior of the MAX16998AAUA+?

The MAX16998AAUA+ implements a non-windowed (100%) watchdog timer that asserts RESET when two consecutive WDI falling edges are missed within the programmed timeout period (t_WP). It does not detect early-fault edges like windowed variants (e.g., MAX16998BAUA+). The timeout is set by a capacitor on the SWT pin sourcing 500nA, and t_WP ranges from 6.8ms to 217ms depending on capacitance. This behavior is confirmed in the MAX16998AAUA+ datasheet Figure 2 and "MAX16998A" subsection of Detailed Description.

Does the MAX16998AAUA+ support power-on reset sequencing?

Yes, the MAX16998AAUA+ guarantees proper power-on reset sequencing: RESET asserts when VIN exceeds 1.1V, remains low while RESETIN rises, and stays asserted for the full t_RESET period after RESETIN crosses its 1.235V threshold. The datasheet specifies that VIN must exceed 5V for ≥270µs before RESETIN reaches VPON to ensure reliable startup - a requirement explicitly defined for the MAX16998AAUA+ in Figure 6 and Power-On/Power-Off Sequence section.

What are the absolute maximum ratings for the RESET and ENABLE outputs of the MAX16998AAUA+?

The MAX16998AAUA+ RESET output tolerates up to 18V on its pull-up rail, while the ENABLE output supports up to 28V - both specified in the Absolute Maximum Ratings table. These ratings allow direct interfacing with 12V and 24V automotive logic domains without external level shifters. The outputs are open-drain with guaranteed VOL ≤0.4V at 1mA (RESET) and 5mA (ENABLE), as verified in the Electrical Characteristics table under "RESET Output Low Voltage" and "ENABLE Output Low Voltage".

How is the reset threshold voltage set on the MAX16998AAUA+?

The MAX16998AAUA+ uses an external resistive divider on the RESETIN pin to set the reset threshold. The internal comparator trips at 1.235V (VPON), so R1 and R2 are selected using V_TH = VPON × (1 + R1/R2). For example, to monitor a 5V rail, R2 = 100kΩ and R1 ≈ 305kΩ yields V_TH = 5.0V. This method is documented in Figure 7 and "RESETIN Input" section of the MAX16998AAUA+ datasheet, with leakage current <0.1µA ensuring accuracy.

Is the MAX16998AAUA+ pin-compatible with other devices in the MAX16997/MAX16998 family?

Yes, the MAX16998AAUA+ shares identical 8-pin μMAX packaging and pinout with all family members including MAX16997AAUA+, MAX16998BAUA+, and MAX16998DAUA+. Pin functions (IN, RESETIN, SWT, GND, WDI, ENABLE, N.C., N.C.) are consistent across variants - confirmed in the Pin Configurations section and Selector Guide. However, functional differences (e.g., windowed vs. non-windowed watchdog) require firmware validation even with identical layout.

MAX16998AAUA+ 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

MAX16998AAUA+ FAQ

1.How can I place an order for MAX16998AAUA+ through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX16998AAUA+ 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+ reliable?

The price and inventory of MAX16998AAUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16998AAUA+ is usually 5 days.

3.What payment methods are accepted for MAX16998AAUA+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16998AAUA+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX16998AAUA+?

MAX16998AAUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX16998AAUA+ 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+?

For technical support, including MAX16998AAUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16998AAUA+ requirements.

6.How does Aetrix verify that MAX16998AAUA+ is sourced from the original manufacturer or authorized distributors?

All MAX16998AAUA+ 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+ meets industry standards.

7.What is the process for return or replacement of MAX16998AAUA+?

All MAX16998AAUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16998AAUA+, 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+ part is unused and in its original packaging.

Return procedure for MAX16998AAUA+:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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