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Analog Devices Inc./Maxim Integrated MAX16998AAUA+T
- Part No.:
- MAX16998AAUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX16998AAUA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX16998AAUA+T from Maxim Integrated is a high-voltage automotive watchdog timer and reset supervisor IC with dual open-drain outputs (RESET and ENABLE), capacitor-adjustable timeout periods, and AEC-Q100 qualification for -40°C to +125°C operation. It monitors RESETIN voltage for power-rail supervision and WDI for microprocessor activity, asserting RESET on threshold violation or watchdog fault, and ENABLE after three consecutive faults - used in engine control units, ADAS domain controllers, and infotainment power management.
For engineers reviewing the MAX16998AAUA+T datasheet, MAX16998AAUA+T pinout, MAX16998AAUA+T application, or MAX16998AAUA+T equivalent, key selection criteria include its 5V–40V input range, 18µA quiescent current at +125°C, windowed watchdog capability (100% window for this variant), external reset threshold setting via resistive divider, and dual-output fail-safe signaling for redundant system switchover.
Technical Context
The MAX16998AAUA+T implements a timeout-based watchdog architecture with independent SRT and SWT capacitor-controlled timing paths: SRT sets tRESET (1ms–116ms) via internal 500nA ramp current and 1.235V threshold; SWT sets tWP (6.8ms–217ms) using identical ramp characteristics. RESET asserts low on RESETIN < 1.235V or WDI timeout, holding for tRESET before release; ENABLE asserts low only after three consecutive WDI faults, provided RESETIN remains above threshold.
It features TTL/CMOS-compatible open-drain outputs with 18V max RESET pullup voltage and 28V max ENABLE pullup voltage, car-battery-compatible EN input logic (not used in MAX16998A variant), and narrow-pulse immunity rejecting WDI pulses < 6.5µs. The device operates with no internal reference trimming - all thresholds and currents are factory-trimmed and temperature-stable across -40°C to +125°C.
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) transients. |
| 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 - accommodates µP boot sequences from fast microcontrollers to complex SoCs. |
| Watchdog Timeout Range | 6.8ms to 217ms adjustable via CSWT capacitor - allows precise alignment with software loop execution time and safety interval requirements. |
| RESET Output Voltage Rating | 18V maximum pullup - permits interfacing with 3.3V, 5V, or 12V µP reset inputs without level-shifting circuitry. |
| ENABLE Output Voltage Rating | 28V maximum pullup - supports direct drive of higher-voltage enable inputs on PMICs or secondary power domains. |
| WDI Pulse Immunity | Rejects pulses < 6.5µs - prevents false watchdog triggers from digital noise, ESD transients, or signal glitches. |
| AEC-Q100 Grade | Qualified to Grade 0 (-40°C to +125°C ambient) - certified for under-hood and safety-critical automotive applications. |
Pinout & Package
MAX16998AAUA+T is housed in an 8-pin lead(Pb)-free µMAX® package (3mm × 3mm, 0.5mm pitch), optimized for space-constrained automotive PCB layouts and thermally robust under hood conditions.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN | Main power supply input (5V–40V); requires 0.1µF ceramic bypass to GND for noise suppression and transient immunity. |
| 2 | NC | No internal connection; must be left unconnected or tied to GND per layout best practice. |
| 3 | NC | No internal connection; must be left unconnected or tied to GND per layout best practice. |
| 4 | SWT | Watchdog timeout adjustment node; connects to GND via capacitor (CSWT) to set tWP; shorting to GND disables watchdog. |
| 5 | GND | Analog/digital ground reference; must be connected to low-impedance system ground plane with minimal trace inductance. |
| 6 | WDI | Watchdog input; high-impedance CMOS/TTL-compatible node requiring clean falling-edge transitions every tWP (or within window for B/D variants). |
| 7 | SRT | Reset timeout adjustment node; connects to GND via capacitor (CSRT) to set tRESET; critical for accurate power-on reset timing. |
| 8 | ENABLE | Open-drain enable output; asserts low after three consecutive WDI faults; requires external pullup to 2.5V–28V supply. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset & watchdog timeouts | Enables precise, application-specific timing without firmware changes - CSRT and CSWT directly scale tRESET and tWP linearly with capacitance. |
| 100% window watchdog (MAX16998A) | Supports standard timeout-based supervision where any missed WDI edge within tWP triggers RESET - ideal for deterministic firmware loops. |
| Car-battery-compatible RESETIN monitoring | High-impedance input accepts resistive divider from monitored rail (e.g., 5V LDO), enabling flexible threshold setting from 1.135V to 1.383V with ±1% accuracy. |
| Open-drain outputs with high-voltage tolerance | RESET (18V max) and ENABLE (28V max) allow direct interface to diverse logic families and power domains without external translators. |
| Power-on/power-off reset sequencing | Guarantees valid RESET assertion during VIN ramp-up (>1.1V) and hold-through power-down, preventing µP startup in undefined states. |
| WDI narrow-pulse immunity | Hardware-filtered input rejects sub-6.5µs noise spikes - eliminates need for external RC filtering in most automotive environments. |
Applications
| Engine Control Unit (ECU) Supervision | ADAS Domain Controller Watchdog |
|---|---|
|
Use Scenario: Monitors 5V LDO output and main µP WDI signal in gasoline/diesel engine control modules operating under wide temperature and voltage stress. IC Role / Device Role / Timing Role: Dual-role supervisor: RESET ensures safe µP restart on undervoltage; ENABLE signals backup controller upon persistent WDI failure. Use Value: Prevents runaway engine behavior by enforcing hard reset within 5ms–100ms and initiating hardware-level redundancy activation after three consecutive faults. |
Use Scenario: Embedded in radar or camera domain controllers to supervise SoC activity and power-rail integrity during autonomous driving cycles. IC Role / Device Role / Timing Role: Fault-detection node that asserts RESET on LDO dropout and ENABLE on SoC hang - both timed independently via SRT/SWT caps. Use Value: Enables ASIL-B compliant fail-safe response: immediate µP reset + delayed enable of fallback processor without software intervention. |
| Infotainment System Power Management | Body Control Module (BCM) Redundancy |
|
Use Scenario: Manages startup sequencing and runtime supervision of multimedia SoCs in head-unit designs exposed to stop-start battery transients. IC Role / Device Role / Timing Role: Supervisor IC coordinating power-on reset timing (tRESET) and software health check (tWP) with separate capacitive tuning. Use Value: Eliminates boot failures caused by slow LDO settling or firmware lockup - guarantees reliable user interface recovery within defined safety windows. |
Use Scenario: Used in gateway or central BCMs to monitor critical sub-systems (e.g., door lock MCU, lighting driver) and trigger switchover to backup circuits. IC Role / Device Role / Timing Role: Hardware-level redundancy arbiter: RESET resets failed node; ENABLE activates secondary controller only after confirmed fault persistence. Use Value: Achieves zero-downtime operation for Class-A body functions by decoupling detection (RESET) from action (ENABLE) with configurable timing margins. |
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+T | Factory-set 50% window watchdog (vs. 100% in MAX16998AAUA+T); identical pinout, timing, and electrical specs otherwise. | Required where fault detection must distinguish early vs. late WDI edges - e.g., real-time OS with jitter-tolerant task scheduling. | Select MAX16998BAUA+T only if windowed supervision is mandated by functional safety architecture; otherwise MAX16998AAUA+T provides simpler timeout-based behavior. |
| TLV809EADBZR | Single-output (RESET only), no ENABLE or watchdog; 3.3V fixed threshold; 1.8V–6V supply; no capacitor-adjustable timing. | Limited to basic voltage-monitoring applications without µP activity supervision or redundancy signaling. | Use TLV809EADBZR only for cost-sensitive non-safety systems requiring only power-rail reset - not a functional substitute for MAX16998AAUA+T's dual-output watchdog capability. |
Compared with MAX16998BAUA+T, the MAX16998AAUA+T offers simpler timeout-based fault detection without windowing complexity; compared with TLV809EADBZR, it delivers full supervisory functionality - dual outputs, adjustable timing, and automotive-grade voltage range - essential for ISO 26262-compliant systems.
Availability
MAX16998AAUA+T is available at Aetrix Electronics and suitable for automotive engine control, ADAS domain controllers, and infotainment systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX16998AAUA+T 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management solutions for automotive, industrial, and communications markets.
The MAX16997/MAX16998 product line was designed specifically for automotive power-supply supervision and microprocessor health monitoring - delivering high-voltage tolerance, ultra-low quiescent current, and AEC-Q100 reliability in compact packages.
FAQ
What is the function of the SRT pin on the MAX16998AAUA+T?
The SRT pin on the MAX16998AAUA+T is the reset timeout adjustment input. It connects to an external capacitor (CSRT) to ground, setting the duration of the RESET assertion period (tRESET) via a precision 500nA internal current source and 1.235V threshold. For example, a 2000pF capacitor yields ~5ms tRESET. This pin must be kept free of stray capacitance and leakage to ensure timing accuracy across temperature.
Does the MAX16998AAUA+T support windowed watchdog functionality?
No, the MAX16998AAUA+T implements a standard timeout-based watchdog (100% window), not a windowed watchdog. Only MAX16998B and MAX16998D variants feature factory-set 50% and 75% windowing. The MAX16998AAUA+T asserts RESET if two consecutive WDI falling edges do not occur within the programmed tWP - making it suitable for deterministic firmware supervision without timing-window constraints.
What is the maximum allowable voltage on the RESET output of the MAX16998AAUA+T?
The RESET output of the MAX16998AAUA+T is an open-drain structure rated for a maximum pullup voltage of 18V. This allows direct interface with 3.3V, 5V, or 12V microcontroller reset inputs without level-shifting components. Exceeding 18V risks damage to the internal clamp diode and is outside absolute maximum ratings.
How does the ENABLE output behave during power-up of the MAX16998AAUA+T?
During power-up, the ENABLE output of the MAX16998AAUA+T remains high-impedance until VIN exceeds 1.1V and RESETIN rises above its threshold (1.235V). ENABLE only asserts low after three consecutive WDI faults - it does not activate during initial power sequencing. This ensures ENABLE is reserved strictly for persistent software failure detection, not transient startup conditions.
Can the MAX16998AAUA+T monitor multiple voltage rails simultaneously?
No, the MAX16998AAUA+T monitors only one voltage rail via its RESETIN input. It uses a single high-impedance comparator referenced to a 1.235V internal threshold; external resistive dividers set the actual trip point (e.g., 5V, 3.3V). To supervise multiple rails, discrete supervisors or multi-channel ICs like the MAX16051 would be required - the MAX16998AAUA+T is optimized for single-rail + µP activity supervision.
MAX16998AAUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX16998AAUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16998AAUA+T 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+T reliable?
The price and inventory of MAX16998AAUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16998AAUA+T is usually 5 days.
3.What payment methods are accepted for MAX16998AAUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16998AAUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16998AAUA+T?
MAX16998AAUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16998AAUA+T 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+T?
For technical support, including MAX16998AAUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16998AAUA+T requirements.
6.How does Aetrix verify that MAX16998AAUA+T is sourced from the original manufacturer or authorized distributors?
All MAX16998AAUA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX16998AAUA+T?
All MAX16998AAUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16998AAUA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX16998AAUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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