Analog Devices Inc./Maxim Integrated MAX6753KA46/V+T

Overview

MAX6753KA46/V+T from Analog Devices is a window watchdog supervisory IC for automotive-grade microprocessor monitoring, featuring factory-trimmed 4.625V VCC reset threshold (±2%), capacitor-adjustable reset timeout (5.7–9.5ms), capacitor-adjustable slow watchdog period (729–1214ms), pin-strappable fast watchdog ratio (8×/16×/64×), and AEC-Q100 qualification for use in engine control units and ADAS power management.

For engineers reviewing the MAX6753KA46/V+T datasheet, MAX6753KA46/V+T pinout, MAX6753KA46/V+T application, or MAX6753KA46/V+T equivalent, this page delivers verified electrical parameters, automotive-qualified thermal performance (-40°C to +125°C), SOT23-8 package layout, window watchdog timing behavior, and direct alternatives with documented functional divergence.

Technical Context

The MAX6753KA46/V+T implements a dual-threshold window watchdog architecture: it asserts RESET when WDI falling edges occur faster than tWD1 (e.g., 121ms typ at CSWT = 1500pF, SET0/SET1 = low/low) or slower than tWD2 (971ms typ). It uses internal ramp comparators (VRAMP = 1.235V ±32mV) on SRT/SWT pins to convert external capacitor values into precise timeout periods via linear current-source charging (IRAMP = 250nA typ).

This device integrates a fixed 4.625V VCC monitor (±2% over -40°C to +125°C), a high-impedance RESET IN input (1.235V threshold), push-pull active-low RESET output (VOL = 0.3V @ 50µA), and guaranteed RESET validity down to VCC = 1.0V - all in an 8-pin SOT23 package qualified per AEC-Q100 Grade 0.

Key Specifications

Pinout & Package

MAX6753KA46/V+T is housed in an 8-pin SOT23 package (Outline 21-0078, Land Pattern 90-0176), measuring 2.9mm × 1.6mm × 1.1mm, with RoHS-compliant lead finish and 196°C/W junction-to-ambient thermal resistance on a four-layer PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6753KA46/V+T, MAX6752KA32/V+T offers identical window watchdog functionality but targets 3.3V rails, while TPS3808G33DBVR lacks windowing capability and provides only 350ms maximum timeout - making it inadequate for applications requiring dual-boundary fault detection like ADAS or medical infusion pumps.

Availability

MAX6753KA46/V+T is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera modules, medical infusion pumps, and industrial PLC I/O requiring stable component supply with AEC-Q100 traceability and extended temperature support.

Supply support for MAX6753KA46/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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets since 1965.

The MAX6746–MAX6753 family was designed specifically for automotive and industrial microprocessor supervision, emphasizing AEC-Q100 qualification, ultra-low power, and window watchdog reliability in harsh environments.

FAQ

What is the exact reset threshold voltage of MAX6753KA46/V+T and how is it trimmed?

The MAX6753KA46/V+T features a factory-trimmed VCC reset threshold of 4.625V with ±2% tolerance over -40°C to +125°C. This value is laser-trimmed during production and corresponds to suffix "46" in the ordering code per Table 2 of the datasheet. It does not require external resistor networks for VCC monitoring, unlike adjustable variants such as MAX6748.

Does MAX6753KA46/V+T support window watchdog functionality, and how is it configured?

Yes, MAX6753KA46/V+T implements a true window watchdog using two independent thresholds: tWD1 (fast fault) and tWD2 (slow fault). Configuration is done via SET0 and SET1 pins - for example, SET0 = low and SET1 = low selects an 8× ratio (tWD1 ≈ tWD2/8). The slow watchdog period tWD2 is set by capacitor CSWT on the SWT pin.

What package type and footprint does MAX6753KA46/V+T use, and is it RoHS-compliant?

MAX6753KA46/V+T uses an 8-pin SOT23 package (Outline 21-0078, Land Pattern 90-0176), with dimensions 2.9mm × 1.6mm × 1.1mm. The "+T" suffix confirms tape-and-reel packaging and RoHS compliance per JEDEC J-STD-020 moisture sensitivity level 1 rating.

Can MAX6753KA46/V+T monitor both VCC and an external voltage simultaneously?

No - MAX6753KA46/V+T monitors only the VCC supply using its fixed 4.625V threshold. It does not include the RESET IN comparator found in MAX6748–MAX6751. For dual-voltage monitoring (e.g., VCC + auxiliary rail), use MAX6750KA46/V+T, which combines factory-trimmed VCC threshold with adjustable RESET IN input.

What is the minimum supply voltage required for MAX6753KA46/V+T to guarantee valid RESET output?

MAX6753KA46/V+T guarantees correct RESET logic state (push-pull high/low) for VCC ≥ 1.0V. Below 1.0V, output drive strength degrades; however, the device remains functional down to VCC = 1.2V per absolute maximum ratings, and RESET remains asserted until VCC rises above 4.625V or the reset timeout expires.