Analog Devices Inc./Maxim Integrated MAX16998BAUA/V+T

Overview

MAX16998BAUA/V+T from Maxim Integrated is an AEC-Q100 qualified automotive-grade high-voltage watchdog timer IC with windowed watchdog functionality, 5V–40V input range, 18μA quiescent current at +125°C, and dual open-drain outputs (RESET and ENABLE). It monitors microprocessor health in engine control units by detecting WDI timing faults outside a factory-set 50% window and asserting RESET for tRESET after fault detection.

For engineers reviewing the MAX16998BAUA/V+T datasheet, MAX16998BAUA/V+T pinout, MAX16998BAUA/V+T application, or MAX16998BAUA/V+T equivalent, key selection criteria include windowed watchdog behavior (50% window), reset timeout adjustability via SRT capacitor, automotive temperature support (−40°C to +125°C), and compatibility with 12V/24V battery systems requiring robust power-on/power-off sequencing.

Technical Context

The MAX16998BAUA/V+T implements a factory-configured 50% window watchdog timer where valid WDI falling edges must occur within tCW ≤ tWDI ≤ tWP; early (tWDI < tCW) or late (tWDI > tWP) edges trigger RESET assertion for tRESET. Its RESETIN input uses an external resistive divider to set a 1.235V threshold, and RESET remains low for tRESET after RESETIN recovers.

It features two independent capacitor-adjustable timing paths: SWT sets tWP (watchdog timeout) via IRAMP_SWT = 500nA and VRAMP = 1.235V; SRT sets tRESET (reset timeout) via IRAMP_SRT = 500nA. Both outputs are TTL/CMOS-compatible open-drain: RESET supports up to 18V pullup, ENABLE up to 28V, with VOLRST ≤ 0.4V at 0.4mA and VOLEN ≤ 0.4V at 5mA.

Key Specifications

Pinout & Package

MAX16998BAUA/V+T is housed in an 8-pin lead(Pb)-free μMAX® package (3mm × 3mm), RoHS-compliant and automotive-qualified (denoted by /V). The package supports surface-mount reflow and provides thermal resistance θJA = 206.3°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16998DAUA/V+, the MAX16998BAUA/V+T offers tighter fault detection sensitivity due to its 50% window, making it preferable for deterministic real-time control loops; compared with TLV809E33DBZR, it delivers full system-level supervision including programmable timing, dual outputs, and automotive voltage range - not just voltage thresholding.

Availability

MAX16998BAUA/V+T is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, body control modules, electric power steering systems, and infotainment head units requiring stable component supply across automotive production lifecycles.

Supply support for MAX16998BAUA/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 automotive, industrial, and communications applications.

The MAX16997/MAX16998 product line delivers high-voltage, low-quiescent-current supervisory solutions specifically engineered for automotive microprocessor reliability - emphasizing AEC-Q100 qualification, wide input range, and configurable watchdog timing.

FAQ

What is the watchdog window size for MAX16998BAUA/V+T?

The MAX16998BAUA/V+T features a factory-set 50% window watchdog timer, meaning valid WDI falling edges must occur between tCW = 0.5 × tWP and tWP. This configuration detects both early faults (WDI edge before tCW) and late faults (no edge after tWP), triggering RESET assertion for the full tRESET period. The window size is fixed for the MAX16998B variant and cannot be modified externally.

How is the reset timeout period configured on MAX16998BAUA/V+T?

The reset timeout period (tRESET) on MAX16998BAUA/V+T is configured using an external capacitor (CSRT) connected between the SRT pin and GND. With IRAMP_SRT = 500nA and VRAMP = 1.235V, tRESET ranges from 1ms (390pF) to 116ms (47nF). The capacitor must be low-leakage and stable; stray capacitance on SRT traces must be minimized to maintain timing accuracy.

Does MAX16998BAUA/V+T support power-on and power-off reset sequencing?

Yes, MAX16998BAUA/V+T supports robust power-on and power-off reset sequencing. On power-up, RESET asserts low once VIN exceeds 1.1V and remains low until RESETIN rises above VPON (1.235V) and the tRESET period expires. On power-down, RESET asserts when RESETIN falls below VPON and stays low until VIN drops below 1.1V - ensuring clean state transitions during battery disconnect or load dump events.

What are the absolute maximum voltage ratings for the RESET and ENABLE outputs of MAX16998BAUA/V+T?

The RESET output of MAX16998BAUA/V+T supports a maximum pullup voltage of 18V, while the ENABLE output supports up to 28V. Both are open-drain outputs requiring external pullup resistors. Input voltage limits are stricter: WDI, RESET, and EN tolerate −0.3V to +20V; SRT and SWT tolerate −0.3V to +12V; IN tolerates −0.3V to +45V. Exceeding these may cause permanent damage.

Is MAX16998BAUA/V+T pin-compatible with other variants in the MAX16997/MAX16998 family?

Yes, MAX16998BAUA/V+T is pin-compatible with all 8-pin μMAX variants in the MAX16997/MAX16998 family, including MAX16998AAUA/V+, MAX16998DAUA/V+, and MAX16997AAUA+. All share identical pin assignments, package dimensions (3mm × 3mm), and footprint. Functional differences (e.g., window size, EN usage) are implemented internally and do not affect PCB layout or soldering.