Analog Devices Inc./Maxim Integrated MAX6747KA30/V+T

Overview

MAX6747KA30/V+T from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 3.0V VCC reset threshold, manual-reset input (MR), push-pull active-low RESET output, and capacitor-adjustable reset timeout (tRP) and watchdog timeout (tWD). It monitors single-supply VCC (1.2V–5.5V), asserts reset on VCC drop below 3.0V ±2%, and supports automotive-grade operation from –40°C to +125°C. Used in battery-powered controllers and critical μP monitoring where reliable power-on reset and manual recovery are required.

For engineers reviewing the MAX6747KA30/V+T datasheet, MAX6747KA30/V+T pinout, MAX6747KA30/V+T application, or MAX6747KA30/V+T equivalent, key selection criteria include its fixed 3.0V reset threshold, MR-enabled manual reset capability, push-pull RESET drive strength at low VCC (guaranteed valid down to 1V), SOT23-8 automotive package, and capacitor-tunable watchdog/reset delays - all validated for medical equipment, automotive ECUs, and embedded controllers requiring AEC-Q100 compliance.

Technical Context

The MAX6747KA30/V+T implements a dual-path reset architecture: one path monitors VCC against a factory-trimmed 3.0V ±2% threshold; the other accepts manual reset assertion via internal pull-up MR pin. Reset remains asserted for a user-defined timeout period (tRP = 4.94 × 10⁶ × CSRT) after VCC recovers above threshold or MR releases.

Its watchdog timer operates in normal mode only (no WDS pin or extended-mode support), with timeout set by external capacitor on SWT (tWD = 4.94 × 10⁶ × CSWT). Watchdog fault detection occurs on missing falling edge at WDI within tWD; timer clears on WDI transition or RESET assertion. No windowed watchdog or SET0/SET1 logic - confirmed by pin configuration table and Selector Guide.

Key Specifications

Pinout & Package

MAX6747KA30/V+T is housed in an 8-pin SOT23 package (Outline 21-0078, RoHS-compliant), optimized for space-constrained automotive and portable applications. Thermal resistance is 196°C/W (Junction-to-Ambient, four-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6746KA30/V+T, MAX6747KA30/V+T adds dedicated MR functionality without changing footprint or timing behavior - enabling simpler manual recovery. Versus TLV803EB30DBZR, it delivers full watchdog supervision and capacitor-based timing flexibility at higher quiescent current, making it suitable for applications where runtime integrity matters.

Availability

MAX6747KA30/V+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical monitors, battery-powered industrial sensor nodes, and critical embedded controllers requiring stable component supply across extended temperature and lifecycle demands.

Supply support for MAX6747KA30/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 industrial, automotive, communications, and healthcare markets.

The MAX6746–MAX6753 family was designed specifically for robust, low-power microprocessor supervision in harsh environments - emphasizing AEC-Q100 qualification, transient immunity, and flexible reset/watchdog configurability for automotive and critical embedded use cases.

FAQ

What is the exact reset threshold voltage of the MAX6747KA30/V+T and how stable is it over temperature?

The MAX6747KA30/V+T has a factory-trimmed VCC reset threshold of 3.0V with ±2% tolerance over the full automotive temperature range (–40°C to +125°C). This specification is guaranteed by design and verified across temperature - typical drift is less than ±0.5% from 25°C, as shown in the Normalized Reset Threshold vs. Temperature graph (toc08). The threshold remains stable without external components, eliminating calibration overhead in production.

Does the MAX6747KA30/V+T support watchdog timeout extension via the WDS pin?

No. The MAX6747KA30/V+T does not support extended watchdog mode. Per the Pin Configurations table and Selector Guide, WDS is unused on MAX6747 - only MAX6746–MAX6751 with WDS pin enabled support 128× timeout extension. MAX6747 operates exclusively in normal watchdog mode, where tWD is set solely by CSWT on the SWT pin.

Can the MAX6747KA30/V+T monitor two supply voltages simultaneously?

No. The MAX6747KA30/V+T monitors only the VCC supply using its factory-trimmed 3.0V threshold. It does not include RESET IN functionality (unlike MAX6748–MAX6751) or dual-threshold capability (unlike MAX6750/MAX6751). Its sole monitored rail is VCC; external voltage monitoring requires a separate supervisor or resistor-divider solution.

What is the minimum VCC required for the MAX6747KA30/V+T to guarantee valid RESET output logic?

The MAX6747KA30/V+T guarantees correct RESET logic state (high/low) for VCC ≥ 1.0V. Below 1.0V, push-pull drive strength degrades - though RESET remains functional down to ~0.8V in practice. For applications requiring valid RESET down to 0V, a 100kΩ pulldown resistor between RESET and GND is recommended, as documented in the "Ensuring a Valid RESET Down to VCC = 0V" section.

Is the MAX6747KA30/V+T pin-compatible with other devices in the MAX6746–MAX6753 family?

Yes - MAX6747KA30/V+T shares the identical 8-pin SOT23 pinout with all members of the MAX6746–MAX6753 family, including MAX6746, MAX6748, and MAX6752. However, pin functionality differs: MR (Pin 1) is unique to MAX6746/MAX6747; RESET IN replaces MR on MAX6748–MAX6751; SET0/SET1 replace MR on MAX6752/MAX6753. PCB layout is interchangeable, but firmware and external components must match the specific variant's feature set.