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Analog Devices Inc./Maxim Integrated MAX16998AAUA/V+T
- Part No.:
- MAX16998AAUA/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX16998AAUA/V+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,284
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Product details
Overview
MAX16998AAUA/V+T from Maxim Integrated is an automotive-grade high-voltage microprocessor supervisory IC with dual open-drain outputs (RESET and ENABLE), capacitor-adjustable watchdog and reset timeout periods, and external voltage monitoring via RESETIN. It operates from 5V to 40V input, draws only 18µA typical quiescent current at +125°C, and is AEC-Q100 qualified for under-hood automotive power management.
For engineers reviewing the MAX16998AAUA/V+T datasheet, MAX16998AAUA/V+T pinout, MAX16998AAUA/V+T application, or MAX16998AAUA/V+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed timing parameters (tRESET = 5ms @ CSRT = 2000pF, tWP = 12ms @ CSWT = 1200pF), automotive thermal range (-40°C to +125°C), and two validated alternative parts with documented technical differences.
Technical Context
The MAX16998AAUA/V+T implements a dual-function supervisory architecture: a precision reset comparator monitors RESETIN with 1.235V threshold (±120mV over temperature) and triggers active-low open-drain RESET output; simultaneously, a capacitor-programmable watchdog timer detects software hangs via WDI input and asserts ENABLE after three consecutive faults. Its windowed watchdog variant is excluded-this is the MAX16998A version with 100% timeout window and two-falling-edge fault detection.
It features independent SRT and SWT pins sourcing 500nA ramp currents (±10%) to set tRESET and tWP via external capacitors, TTL/CMOS-compatible open-drain outputs rated to 18V (RESET) and 28V (ENABLE), and robust input protection: IN withstands -0.3V to +45V, WDI/RESETIN tolerate -0.3V to +20V, and WDI rejects pulses narrower than 1µs. All functions remain fully specified 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 rail without pre-regulation. |
| Quiescent Current | 18µA typical at +125°C - enables always-on monitoring in low-power vehicle subsystems. |
| Reset Timeout Period | 5ms (typical, CSRT = 2000pF) - ensures reliable µP initialization after LDO stabilization. |
| Watchdog Timeout Period | 12ms (typical, CSWT = 1200pF) - matches typical firmware loop execution windows in automotive ECUs. |
| RESET Output Voltage Rating | 18V max - allows pull-up to 12V or 5V logic rails with margin for transients. |
| ENABLE Output Voltage Rating | 28V max - supports direct interface to higher-voltage backup control circuits. |
| Operating Temperature | -40°C to +125°C - fully qualified for engine compartment and ADAS module placement. |
| AEC-Q100 Grade | Grade 0 - certified for automotive safety-critical applications per AEC-Q100 Rev H. |
Pinout & Package
MAX16998AAUA/V+T is housed in an 8-pin lead(Pb)-free µMAX® package (3mm × 3mm, 0.5mm pitch), RoHS-compliant and automotive-qualified. Pin 1 is marked with a dot; pin numbering follows standard counter-clockwise orientation from the mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Power-supply input | Bypass with 0.1µF ceramic capacitor to GND; accepts 5–40V unregulated automotive supply. |
| 2 RESETIN | Reset threshold input | High-impedance comparator input; connect to resistive divider to set reset point (e.g., 12V LDO output). |
| 3 NC | No connection | Not internally bonded; must be left floating or tied to GND (no electrical function). |
| 4 SWT | Watchdog timeout adjustment | Connect capacitor to GND to program tWP; grounding disables watchdog function. |
| 5 GND | Analog/digital ground | Primary reference for all internal comparators and ramp generators; connect to low-impedance system ground plane. |
| 6 WDI | Watchdog trigger input | Accepts falling-edge pulses ≥6.5µs wide; ignores glitches <1µs; initiates watchdog clear on edge detection. |
| 7 NC | No connection | Not internally bonded; must be left floating or tied to GND (no electrical function). |
| 8 ENABLE | Open-drain enable output | Asserts low after three consecutive WDI faults; requires external pull-up to 2.5–28V rail. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | tRESET programmable from 1ms to 116ms using CSRT (390pF–47nF), enabling precise match to µP power-up sequence. |
| Capacitor-adjustable watchdog timeout | tWP programmable from 6.8ms to 217ms using CSWT (680pF–22nF), supporting diverse firmware loop durations. |
| Car battery-compatible RESETIN input | 1.235V threshold with ±120mV drift over -40°C to +125°C, stable across battery voltage fluctuations (9–16V). |
| TTL/CMOS-compatible open-drain outputs | RESET and ENABLE sink up to 1mA and 5mA respectively, compatible with 3.3V, 5V, and 12V logic families. |
| WDI narrow-pulse immunity | Ignores pulses <1µs wide, preventing false watchdog clears from EMI-induced noise on WDI trace. |
| Power-on/power-off reset functionality | Guaranteed RESET assertion during VIN ramp-up (>1.1V) and hold-down during VIN decay below 1.1V. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
Use Scenario: Monitors 12V supply and microcontroller activity in gasoline/diesel engine management systems subject to cold cranking and load dump. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brown-out detection via RESETIN, and software hang detection via WDI. Use Value: Ensures deterministic µP boot after ignition and forces fail-safe state (e.g., fuel cut-off) if firmware locks up - critical for ISO 26262 ASIL-B compliance. |
Use Scenario: Secures vision processing SoC in front-facing camera modules exposed to wide ambient temperature swings and EMI. IC Role / Device Role / Timing Role: Dual-output supervisor asserting RESET on LDO undervoltage and ENABLE on sustained WDI inactivity. Use Value: Enables graceful handover to redundant imaging path when primary SoC freezes - meets ASIL-C diagnostic coverage requirements. |
| Automotive Infotainment Head Unit | Electric Power Steering (EPS) Control Module |
Use Scenario: Manages boot sequencing and runtime health of multi-core application processor running Linux-based IVI stack. IC Role / Device Role / Timing Role: Generates timed RESET pulse at power-up and latches ENABLE upon three missed WDI edges. Use Value: Prevents hung UI states by triggering controlled reboot or safe mode activation - improves customer perception of system reliability. |
Use Scenario: Supervises torque-control MCU in safety-critical EPS systems where failure could cause loss of steering assist. IC Role / Device Role / Timing Role: Provides AEC-Q100 Grade 0–qualified reset supervision and watchdog escalation to secondary controller. Use Value: Delivers hardware-enforced time-bounded fault response (<100ms total latency) required for ASIL-D decomposition. |
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% window watchdog (vs. 100% in MAX16998AAUA/V+T); identical pinout, supply specs, and temperature range. | Rejects both early and late WDI edges - tighter fault detection for time-critical firmware loops. | Select MAX16998BAUA/V+ when application requires windowed watchdog behavior to catch premature or delayed WDI transitions. |
| TLV809EADBZR | Single-output (RESET only), no ENABLE or watchdog; fixed 3.08V reset threshold; 1.8–6V supply; not AEC-Q100 qualified. | Lacks dual-output supervision and programmable timing - suitable only for basic reset-only use cases. | Choose TLV809EADBZR only for non-automotive, low-voltage, cost-sensitive designs where watchdog functionality is unnecessary. |
Compared with MAX16998BAUA/V+, the MAX16998AAUA/V+T provides simpler two-edge watchdog logic ideal for legacy firmware; versus TLV809EADBZR, it delivers full automotive-grade dual-output supervision with field-programmable timing - eliminating need for external timing components or secondary supervisors.
Availability
MAX16998AAUA/V+T is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera modules, infotainment head units, and electric power steering systems requiring stable component supply across extended temperature and lifecycle demands.
Supply support for MAX16998AAUA/V+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 demanding industrial, communications, and automotive applications.
The MAX16998AAUA/V+T belongs to the MAX16997/MAX16998 family of high-voltage watchdog timers engineered specifically for automotive microprocessor supervision - emphasizing ultra-low quiescent current, wide input range, and AEC-Q100 qualification.
FAQ
What is the exact watchdog timeout behavior of the MAX16998AAUA/V+T?
The MAX16998AAUA/V+T implements a timeout watchdog (not windowed): RESET asserts if two consecutive WDI falling edges do not occur within the programmed tWP period. The initial tWP is 12ms with CSWT = 1200pF. Each WDI falling edge resets the timer; absence triggers RESET for tRESET (5ms typical). This differs from MAX16998B/D variants which require WDI edges within a defined window.
Does the MAX16998AAUA/V+T support power-on reset with proper sequencing?
Yes. The MAX16998AAUA/V+T guarantees RESET assertion once VIN exceeds 1.1V and holds RESET low until RESETIN rises above its 1.235V threshold, then times tRESET before releasing RESET. For correct operation, VIN must exceed 5V for >270µs before RESETIN crosses VPON - ensuring stable power delivery prior to µP release.
Can the MAX16998AAUA/V+T monitor voltages other than 12V systems?
Yes. RESETIN is a high-impedance input referenced to an internal 1.235V bandgap. By connecting an external resistive divider (e.g., R1 = 820kΩ, R2 = 100kΩ), the MAX16998AAUA/V+T can monitor any DC voltage - including 3.3V, 5V, or 24V rails - with accuracy limited only by resistor tolerance and temperature drift.
What are the absolute maximum ratings for the WDI and RESETIN pins on the MAX16998AAUA/V+T?
The WDI and RESETIN pins on the MAX16998AAUA/V+T tolerate -0.3V to +20V continuously. Both inputs feature ESD protection and exhibit <0.1µA leakage at 2V. WDI also rejects pulses narrower than 1µs, providing inherent immunity to digital noise and transient coupling.
Is the MAX16998AAUA/V+T pin-compatible with other members of the MAX16997/MAX16998 family?
Yes - all MAX16997/MAX16998 variants, including MAX16998AAUA/V+T, MAX16998BAUA/V+, and MAX16998DAUA/V+, share identical 8-pin µMAX packaging and pin mapping. Functionally, only the watchdog architecture (timeout vs. windowed) and factory-set window size differ; RESETIN, SRT, SWT, WDI, ENABLE, and RESET retain identical roles and electrical behavior.
MAX16998AAUA/V+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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX16998AAUA/V+T FAQ
1.How can I place an order for MAX16998AAUA/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16998AAUA/V+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/V+T reliable?
The price and inventory of MAX16998AAUA/V+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/V+T is usually 5 days.
3.What payment methods are accepted for MAX16998AAUA/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16998AAUA/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16998AAUA/V+T?
MAX16998AAUA/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16998AAUA/V+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/V+T?
For technical support, including MAX16998AAUA/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16998AAUA/V+T requirements.
6.How does Aetrix verify that MAX16998AAUA/V+T is sourced from the original manufacturer or authorized distributors?
All MAX16998AAUA/V+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/V+T meets industry standards.
7.What is the process for return or replacement of MAX16998AAUA/V+T?
All MAX16998AAUA/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16998AAUA/V+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/V+T part is unused and in its original packaging.
Return procedure for MAX16998AAUA/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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