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Analog Devices Inc./Maxim Integrated MAX16998DAUA+T
- Part No.:
- MAX16998DAUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX16998DAUA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,660
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Product details
Overview
The MAX16998DAUA+T from Maxim Integrated is a high-voltage automotive watchdog timer IC with windowed watchdog functionality, dual open-drain outputs (RESET and ENABLE), and capacitor-adjustable timeout periods. It operates from 5V to 40V input, draws only 18µA typical quiescent current at +125°C, and features a factory-set 75% window size for robust fault detection in engine control units.
For engineers reviewing the MAX16998DAUA+T datasheet, MAX16998DAUA+T pinout, MAX16998DAUA+T application, or MAX16998DAUA+T equivalent, this page delivers verified electrical parameters, AEC-Q100-qualified thermal behavior, exact reset/enable timing dependencies on CSRT/CSWT, and validated alternative options for redundant safety monitoring in 12V/24V automotive systems.
Technical Context
The MAX16998DAUA+T implements a factory-configured 75% windowed watchdog timer (tCW = 25% × tWP, tOW = 75% × tWP), where RESET asserts on WDI falling edges occurring either too early (within closed window) or too late (beyond tWP). Its dual comparator architecture independently monitors RESETIN voltage (1.235V threshold) and WDI edge timing, with internal ramp-current-based timeout generation via external SRT/SWT capacitors.
RESET output remains low for tRESET after RESETIN recovers or WDI fault detection, while ENABLE asserts only after three consecutive bad WDI events - and only if RESETIN voltage exceeds its threshold. The device guarantees correct ENABLE logic state when VIN > 1.1V and supports power-on/power-off sequencing with defined VPON hysteresis (200mV) and tRRDL < 1µs delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.0V to 40.0V - supports direct connection to car battery (12V/24V) without pre-regulation. |
| Quiescent Current | 18µA typical at +125°C - enables always-on monitoring in low-power ECU sleep modes. |
| Watchdog Window Size | 75% of tWP - factory-set for MAX16998D; detects both premature and delayed WDI transitions. |
| Reset Timeout Range | 1ms to 116.09ms - set by CSRT (390pF–47nF); ensures reliable µC initialization across voltage ramps. |
| WDI Pulse Immunity | Rejects pulses < 6.5µs - prevents false watchdog clears from noise or glitches. |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive environments per AEC-Q100 Grade 0. |
| Output Drive Capability | RESET: 1mA sink @ 0.9V max VOL; ENABLE: 5mA sink @ 0.4V max VOLEN - drives standard logic-level pullups. |
Pinout & Package
MAX16998DAUA+T is housed in an 8-pin lead(Pb)-free µMAX package (3mm × 3mm, 0.5mm pitch), RoHS-compliant and qualified for automotive use. Pin functions are electrically isolated per internal block diagram and validated against Maxim's official pin configuration diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Power supply input | Bypassed to GND with 0.1µF; supports 5V–40V operation; minimum 270µs >5V required before RESETIN threshold crossing. |
| 2 - | No connection | Not internally connected; must remain unconnected per datasheet. |
| 3 N.C. | No connection | Not internally connected; no routing or loading permitted. |
| 4 SWT | Watchdog timeout adjustment | Connected to precision 500nA ramp current source; sets tWP via CSWT; grounded to disable watchdog. |
| 5 GND | Ground reference | Primary return path for all internal circuits; requires low-impedance PCB plane connection. |
| 6 WDI | Watchdog input | High-impedance digital input; detects falling edges; ignores pulses <6.5µs; triggers windowed timeout logic. |
| 7 N.C. | No connection | Not internally connected; must remain unconnected. |
| 8 ENABLE | Open-drain enable output | Asserts low after three consecutive bad WDI events; requires external pullup to ≤28V; inactive if RESETIN < threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | 75% open window (MAX16998D) detects both early and late WDI faults - critical for ASIL-B software execution validation. |
| Capacitor-adjustable timeouts | tRESET set by CSRT (1ms–116ms); tWP set by CSWT (6.8ms–217ms); enables precise tuning to µC boot/fault-recovery timing. |
| Car battery-compatible EN/RESETIN inputs | RESETIN accepts 0V–20V; threshold fixed at 1.235V ±120mV; supports direct LDO output monitoring without level shifters. |
| TTL/CMOS-compatible open-drain outputs | RESET max VOL = 0.9V @ 1mA; ENABLE max VOL = 0.4V @ 5mA; interfaces directly with 3.3V/5V/12V logic families. |
| AEC-Q100 qualification | Qualified to Grade 0 (-40°C to +125°C ambient); includes HTOL, TC, ESD, and AC/DC stress testing per automotive standards. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Monitors microcontroller health during cold cranking and transient battery conditions (6V–16V). IC Role / Device Role / Timing Role: Provides power-on reset with VPON hysteresis and windowed watchdog supervision of CAN firmware execution loops. Use Value: Prevents unsafe ECU lockup by asserting RESET on WDI timing violations and enabling backup controller via ENABLE after three consecutive faults. |
Use Scenario: Supervises vision processor startup and real-time lane-departure algorithm execution. IC Role / Device Role / Timing Role: Generates tRESET ≥ 5ms to ensure stable DDR initialization, then enforces 75%-window WDI timing for deterministic fault coverage. Use Value: Meets ISO 26262 ASIL-B diagnostic coverage requirements by detecting stuck-at-zero WDI signals and out-of-window transitions. |
| Body Control Module (BCM) | Electric Power Steering (EPS) |
|
Use Scenario: Ensures fail-safe operation of LIN gateway MCU during ignition cycling and load-dump transients. IC Role / Device Role / Timing Role: Uses RESETIN to monitor 5V LDO output and ENABLE to trigger fallback relay driver upon persistent WDI failure. Use Value: Maintains functional safety integrity without additional voltage supervisors or discrete timers - reducing BOM count and layout area. |
Use Scenario: Validates torque-control loop timing in motor control ASICs under vibration-induced signal corruption. IC Role / Device Role / Timing Role: Applies narrow-pulse-immune WDI input and 18V-tolerant RESET output to interface with high-side gate drivers. Use Value: Guarantees torque cut within <100ms of detected software hang, satisfying ISO 26262 QM-to-ASIL decomposition requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage watchdog timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16998BAUA+T | Factory-set 50% window size (vs. 75% for MAX16998DAUA+T); identical pinout, timing architecture, and electrical specs. | Suitable for systems requiring tighter fault detection window (e.g., fast-loop motor control), but less tolerant of jitter in WDI timing. | Select MAX16998BAUA+T when application demands higher sensitivity to premature WDI edges; verify tCW/tOW alignment with µC interrupt latency. |
| TLV809E33DBZR | Single-channel 3.3V reset IC with fixed 200ms timeout; no watchdog, no windowing, no WDI input; SOT-23-3 package. | Limited to low-voltage (≤6V) applications; cannot replace MAX16998DAUA+T in high-voltage automotive domains. | Only consider TLV809E33DBZR for non-safety-critical 3.3V subsystems where watchdog supervision is unnecessary and cost is primary constraint. |
Compared with MAX16998BAUA+T and TLV809E33DBZR, the MAX16998DAUA+T uniquely delivers 75%-window fault discrimination at 40V input with AEC-Q100 qualification - making it the only option among the three suitable for ASIL-B EPS or ADAS domain controllers requiring deterministic timing violation detection.
Availability
MAX16998DAUA+T is available at Aetrix Electronics and suitable for automotive engine control, ADAS sensor fusion, body electronics, and electric power steering systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX16998DAUA+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) designs precision analog, mixed-signal, and power-management ICs for automotive, industrial, and communications markets.
The MAX16997/MAX16998 product line targets high-reliability automotive supervisory functions - specifically delivering adjustable, windowed watchdog timers with ultra-low quiescent current for ECU and ADAS applications.
FAQ
What is the factory-set watchdog window size for MAX16998DAUA+T?
The MAX16998DAUA+T has a factory-set watchdog window size of 75%, meaning the open window period (tOW) equals 75% of the total watchdog timeout period (tWP), while the closed window (tCW) occupies the remaining 25%. This configuration is fixed and not user-adjustable - unlike the capacitor-tunable tWP itself - and is explicitly documented in the Selector Guide and Electrical Characteristics table for MAX16998D.
Does MAX16998DAUA+T support power-on reset with hysteresis?
Yes, MAX16998DAUA+T supports power-on reset with built-in hysteresis: the rising threshold (VPON) is 1.255V typical, and the falling threshold is 1.235V typical, yielding ~200mV hysteresis. This ensures clean, bounce-free reset assertion during battery voltage ramp-up and prevents oscillation near the trip point, as confirmed in the RESETIN Threshold Voltage vs. Temperature graph and Electrical Characteristics table.
Can MAX16998DAUA+T be used with a 3.3V microcontroller?
Yes, MAX16998DAUA+T can interface with 3.3V microcontrollers: its WDI input accepts TTL/CMOS logic levels (VIH = 2.25V min, VIL = 0.9V max), and its open-drain RESET/ENABLE outputs require only external pullups to ≥2.5V - including 3.3V. The device itself operates from 5V–40V, so a separate 3.3V supply is not needed for its core function.
What is the maximum allowable pullup voltage for the ENABLE output of MAX16998DAUA+T?
The maximum allowable pullup voltage for the ENABLE output of MAX16998DAUA+T is 28.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Exceeding this voltage risks damage to the internal output transistor. For 3.3V or 5V logic interfacing, use a pullup resistor connected to the respective rail - ensuring compliance with the 2.25V–28.0V valid range.
How does MAX16998DAUA+T behave during battery undervoltage conditions?
During battery undervoltage, MAX16998DAUA+T maintains guaranteed ENABLE logic state down to VIN = 1.1V. Below that, operation is undefined. RESET asserts when RESETIN falls below 1.235V, and remains asserted until RESETIN recovers and the tRESET timeout expires. If VIN drops below 1.1V while RESET is active, RESET stays low until VIN rises above 1.1V again - ensuring fail-safe behavior during cranking dips.
MAX16998DAUA+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
MAX16998DAUA+T FAQ
1.How can I place an order for MAX16998DAUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16998DAUA+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 MAX16998DAUA+T reliable?
The price and inventory of MAX16998DAUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16998DAUA+T is usually 5 days.
3.What payment methods are accepted for MAX16998DAUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16998DAUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16998DAUA+T?
MAX16998DAUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16998DAUA+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 MAX16998DAUA+T?
For technical support, including MAX16998DAUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16998DAUA+T requirements.
6.How does Aetrix verify that MAX16998DAUA+T is sourced from the original manufacturer or authorized distributors?
All MAX16998DAUA+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 MAX16998DAUA+T meets industry standards.
7.What is the process for return or replacement of MAX16998DAUA+T?
All MAX16998DAUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16998DAUA+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 MAX16998DAUA+T part is unused and in its original packaging.
Return procedure for MAX16998DAUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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