Analog Devices Inc./Maxim Integrated MAX6753KA16-T

Overview

MAX6753KA16-T from Maxim Integrated is a window watchdog supervisory IC for automotive-grade microprocessor monitoring, featuring factory-trimmed 1.575V V_CC reset threshold (±2%), capacitor-adjustable reset timeout (5.7–9.5ms typical with 1500pF), and dual-window watchdog with fast/slow fault detection (t_WD1 = 11.4–152ms, t_WD2 = 729–1214ms). It operates across -40°C to +125°C and supports dual-voltage monitoring in systems requiring robust brownout and software hang protection.

For engineers reviewing the MAX6753KA16-T datasheet, MAX6753KA16-T pinout, MAX6753KA16-T application, or MAX6753KA16-T equivalent, this page delivers verified electrical parameters, AEC-Q100-qualified thermal performance, confirmed SOT23-8 package mapping, and validated alternative parts for critical μP reset and windowed watchdog deployment in battery-powered controllers and intelligent instrumentation.

Technical Context

The MAX6753KA16-T implements a windowed watchdog architecture that detects both early (faster than t_WD1) and late (slower than t_WD2) WDI transitions using independently adjustable slow watchdog period (t_WD2 = 0.65 × 10⁹ × C_SWT) and selectable fast watchdog ratio (8×, 16×, or 64× via SET0/SET1 strapping). Its reset comparator uses a ±2% factory-trimmed 1.575V threshold with 0.8% hysteresis and guarantees valid RESET output down to V_CC ≥ 1V.

It integrates dual monitoring paths: fixed-threshold V_CC supervision and an external resistor-divider input (RESET IN) with 1.235V ±0.019V threshold, enabling simultaneous tracking of primary supply and auxiliary rail. The device asserts active-low RESET in push-pull or open-drain configuration with 0.3V VOL at 50µA sink and 0.8×V_CC VOH at 200µA source.

Key Specifications

Pinout & Package

MAX6753KA16-T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), RoHS-compliant, with 196°C/W junction-to-ambient thermal resistance on four-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6752KA16-T and TLV809E16DBZR, the MAX6753KA16-T uniquely combines dual-voltage monitoring (V_CC + RESET IN), capacitor-adjustable window watchdog, and AEC-Q100 qualification-making it the only option supporting safety-critical automotive and medical applications requiring both supply redundancy and software execution validation.

Availability

MAX6753KA16-T is available at Aetrix Electronics and suitable for automotive ECUs, medical infusion pumps, industrial PLC modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6753KA16-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 and mixed-signal ICs for automotive, industrial, and computing markets, emphasizing high reliability and AEC-Q100 compliance.

The MAX6746–MAX6753 product line targets safety-critical microprocessor supervision, delivering capacitor-programmable reset/watchdog timing, dual-voltage monitoring, and automotive-grade thermal robustness for systems demanding zero tolerance for undetected firmware faults.

FAQ

What is the factory-trimmed reset threshold voltage for MAX6753KA16-T?

The MAX6753KA16-T features a factory-trimmed V_CC reset threshold of 1.575V with ±2% tolerance over -40°C to +125°C. This value is laser-trimmed during production and does not require external resistor networks. The RESET IN input has a separate 1.235V ±0.019V threshold for monitoring auxiliary supplies. Both thresholds include built-in hysteresis (0.8% for V_CC, 0.65–0.90% for RESET IN) to prevent chatter during slow voltage transitions.

How do I configure the window watchdog timeout periods on MAX6753KA16-T?

The MAX6753KA16-T uses two independent capacitors: CSWT on pin 3 (SWT) sets the slow watchdog period t_WD2 = 0.65 × 10⁹ × CSWT seconds, while SET0 and SET1 pins (2 and 6) select the fast watchdog ratio (8×, 16×, or 64×) to derive t_WD1. For example, with CSWT = 1500pF, t_WD2 ≈ 975ms; strapping SET0=low/SET1=low yields t_WD1 ≈ 122ms. WDI falling edges outside this window assert RESET for the SRT-determined timeout period.

Does MAX6753KA16-T support dual-voltage monitoring, and how is it implemented?

Yes, MAX6753KA16-T supports dual-voltage monitoring: pin 8 (V_CC) is monitored against its 1.575V factory-trimmed threshold, while pin 1 (RESET IN) monitors an external voltage via a resistor divider referenced to a fixed 1.235V internal comparator. RESET asserts if either voltage falls below its respective threshold. This enables simultaneous supervision of primary MCU supply and secondary rails like sensor bias or communication interfaces without additional ICs.

What is the minimum V_CC required for guaranteed RESET functionality in MAX6753KA16-T?

MAX6753KA16-T guarantees valid RESET output for V_CC ≥ 1.0V, with VOL ≤ 0.3V at 50µA sink current and VOH ≥ 0.8 × V_CC at 200µA source current. Below 1.0V, RESET behavior is not specified. For applications requiring valid reset down to 0V, a 100kΩ pulldown resistor must be added externally to the push-pull RESET output-this configuration is validated in the MAX6753KA16-T datasheet Figure 7.

Is MAX6753KA16-T AEC-Q100 qualified, and what temperature range does it cover?

Yes, MAX6753KA16-T is AEC-Q100 qualified and fully specified over the automotive temperature range of -40°C to +125°C. This qualification includes stress testing for thermal cycling, humidity, and high-temperature operating life. The device's 196°C/W junction-to-ambient thermal resistance on four-layer boards and 800°C/W on single-layer boards ensures reliable operation in under-hood environments where ambient temperatures exceed 105°C.