Analog Devices Inc./Maxim Integrated MAX6752AKA32+T

Overview

MAX6752AKA32+T from Analog Devices is a window watchdog supervisory IC for microprocessor systems, featuring a factory-trimmed 3.2V VCC reset threshold (±2%, 3.136V–3.224V), capacitor-adjustable reset timeout (5.7–9.5ms with 1500pF), and dual-window watchdog timing (tWD1 = 11.4–19.0ms / tWD2 = 729–1214ms at 1500pF). It operates across -40°C to +125°C and supports automotive-grade reliability (AEC-Q100 qualified).

For engineers reviewing the MAX6752AKA32+T datasheet, MAX6752AKA32+T pinout, MAX6752AKA32+T application, or MAX6752AKA32+T equivalent, key selection criteria include its windowed watchdog behavior (fast/slow fault detection), push-pull RESET output, SOT23-8 package compatibility, and dual-voltage monitoring capability via external resistor divider on RESET IN.

Technical Context

The MAX6752AKA32+T implements a min/max (window) watchdog architecture that asserts RESET when WDI falling edges occur either faster than tWD1 (fast fault) or slower than tWD2 (slow fault), enabling robust detection of processor lockup or timing drift. Its reset function monitors VCC against a fixed 3.2V threshold and optionally monitors an external voltage via RESET IN (1.235V threshold).

Reset timeout (tRP) and slow watchdog period (tWD2) are set by external capacitors on SRT and SWT pins respectively, using linear scaling formulas (tRP = 4.94×10⁶ × CSRT; tWD2 = 0.65×10⁹ × CSWT). Fast watchdog period (tWD1) is selected via SET0/SET1 pin strapping (8×, 16×, or 64× ratio relative to tWD2), with watchdog disabled when SET0=high/SET1=low.

Key Specifications

Pinout & Package

MAX6752AKA32+T is housed in an 8-pin SOT23 package (Outline 21-0078, land pattern 90-0176), optimized for space-constrained PCB layouts in automotive and portable applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX6753AKA32+T and TPS3808G33DBVR, the MAX6752AKA32+T uniquely delivers automotive-grade window watchdog supervision with push-pull output in the same SOT23-8 footprint - enabling safer, more compact designs for ISO 26262 ASIL-B systems without layout revision.

Availability

MAX6752AKA32+T is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pump controllers, industrial PLC I/O modules, telematics control units, and battery-powered embedded controllers requiring stable component supply across extended temperature ranges.

Supply support for MAX6752AKA32+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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision timing and power management solutions.

The MAX6746–MAX6753 family was designed specifically for automotive and industrial microprocessor supervision, emphasizing AEC-Q100 qualification, ultra-low quiescent current, and advanced watchdog architectures to prevent latent system failures.

FAQ

What is the exact reset threshold voltage for MAX6752AKA32+T?

The MAX6752AKA32+T features a factory-trimmed VCC reset threshold of 3.200V with ±2% tolerance, resulting in a guaranteed range of 3.136V to 3.224V over the full -40°C to +125°C operating temperature range. This value is specific to the "32A" suffix variant and is documented in Table 2 of the datasheet. The MAX6752AKA32+T does not use adjustable resistive programming for this threshold - it is fixed and laser-trimmed during production.

How does the window watchdog in MAX6752AKA32+T differ from standard watchdog timers?

The MAX6752AKA32+T implements a true window watchdog that detects both fast faults (WDI transitions occurring faster than tWD1) and slow faults (intervals longer than tWD2), unlike standard watchdogs that only detect timeouts. This dual-bound enforcement prevents false resets from noise while catching subtle timing violations such as ISR jitter or scheduler starvation. The MAX6752AKA32+T achieves this using independent tWD1 and tWD2 timing paths controlled by SET0/SET1 pins.

Can MAX6752AKA32+T monitor two different supply voltages simultaneously?

Yes - the MAX6752AKA32+T monitors VCC against its fixed 3.2V threshold and can simultaneously monitor a second voltage (e.g., 5V or 1.8V rail) via the RESET IN pin, which has a fixed 1.235V threshold. An external resistor divider scales the secondary voltage to match this threshold. This dual-monitoring capability is confirmed in the Selector Guide and Pin Descriptions section, where MAX6752 is explicitly listed with "X" under both FIXED VCC RESET THRESHOLD and ADJUSTABLE RESET THRESHOLD columns.

What capacitor values are recommended for typical reset and watchdog timing with MAX6752AKA32+T?

For a nominal 7.6ms reset timeout, use 1500pF on SRT; for a 1.0s slow watchdog period (tWD2), use 1500pF on SWT. Fast watchdog period tWD1 is then set by SET0/SET1: with both low, tWD1 ≈ 122ms (1/8 of tWD2). Ceramic capacitors with leakage <10nA are required; X7R or C0G types are preferred. These values are derived directly from the formulas tRP = 4.94×10⁶ × CSRT and tWD2 = 0.65×10⁹ × CSWT in the Applications Information section.

Is MAX6752AKA32+T pin-compatible with other devices in the MAX6746–MAX6753 family?

Yes - the MAX6752AKA32+T shares the identical 8-pin SOT23 pinout with all members of the MAX6746–MAX6753 family, including MAX6746, MAX6748, MAX6750, and MAX6753. Pin functions (e.g., SRT, SWT, SET0, SET1, RESET IN, RESET, VCC, GND) are consistent across variants, enabling drop-in replacement where functional requirements align. This compatibility is verified in the Pin Configurations diagram and Pin Descriptions table.