Analog Devices Inc./Maxim Integrated MAX6750KA30+T

Overview

The MAX6750KA30+T from Analog Devices is a dual-voltage microprocessor supervisory IC with factory-trimmed 3.0V VCC reset threshold (±2%), adjustable RESET IN monitoring, capacitor-programmable reset timeout (5.7–9.5ms), and standard watchdog timer. It features push-pull active-low RESET output, manual-reset input (MR), and operates across -40°C to +125°C for automotive-grade reliability in battery-powered controllers and embedded systems.

For engineers reviewing the MAX6750KA30+T datasheet, MAX6750KA30+T pinout, MAX6750KA30+T application, or MAX6750KA30+T equivalent, this device supports dual-supply monitoring (VCC + external VMON_TH), offers transient-immune reset assertion down to VCC ≥ 1V, and enables precise timing control via SRT/SWT capacitors - critical for brownout recovery and firmware watchdog validation in safety-critical embedded designs.

Technical Context

The MAX6750KA30+T integrates two independent reset comparators: one monitors VCC against a factory-trimmed 3.0V threshold (±2% over -40°C to +125°C), while the second accepts an externally set voltage via RESET IN using a resistor divider referenced to 1.235V. Its reset timeout (tRP) and watchdog timeout (tWD) are independently set by external capacitors on SRT and SWT pins, with tRP = 4.94×10⁶ × CSRT (seconds) and tWD = 4.94×10⁶ × CSWT (seconds).

This device belongs to the MAX6746–MAX6753 family and implements a standard (non-windowed) watchdog timer with normal-mode operation only - unlike MAX6752/MAX6753 - and includes MR input with 1μs minimum pulse width and 100ns glitch rejection. The push-pull RESET output guarantees valid logic state for VCC ≥ 1V and sinks up to 3.2mA at VCC ≥ 4.5V.

Key Specifications

Pinout & Package

MAX6750KA30+T is housed in an 8-pin SOT23 package (package code K8+5A), with 0.65mm pitch, 2.9mm × 1.6mm footprint, and thermal resistance θJA = 196°C/W (4-layer board). Pin functions are validated per MAX6750-specific configuration in the official datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6751KA30+T, the MAX6750KA30+T offers direct-drive reset capability without pull-up loading, while TLV809E30DBZR sacrifices adjustability and dual monitoring for lower cost and smaller footprint - making MAX6750KA30+T optimal for robust, feature-complete supervision in automotive and industrial MCU designs.

Availability

MAX6750KA30+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical devices, industrial PLC modules, and smart energy metering systems requiring stable component supply and long-term lifecycle support.

Supply support for MAX6750KA30+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 power, sensing, and timing solutions.

The MAX6746–MAX6753 product line delivers ultra-low-power, AEC-Q100-qualified microprocessor supervisors with configurable reset/watchdog timing and dual-voltage monitoring - engineered specifically for reliability-critical embedded systems in harsh environments.

FAQ

What is the factory-set reset threshold voltage for MAX6750KA30+T?

The MAX6750KA30+T has a factory-trimmed VCC reset threshold of 3.000V with ±2% tolerance over the full -40°C to +125°C temperature range. This value is confirmed in Table 2 of the datasheet under suffix "30", and applies exclusively to the VCC supply monitor - not the adjustable RESET IN input, which uses a separate 1.235V reference.

Does MAX6750KA30+T support windowed watchdog functionality?

No, the MAX6750KA30+T implements only a standard single-window watchdog timer (like MAX6746–MAX6751), not the min/max window watchdog found in MAX6752/MAX6753. Its watchdog timeout is set solely by the SWT capacitor and lacks SET0/SET1 pin strapping for fast/slow fault detection - confirmed by its pinout (no SET0/SET1 pins) and Selector Guide entry.

Can MAX6750KA30+T monitor two independent supply rails simultaneously?

Yes, the MAX6750KA30+T supports true dual-voltage monitoring: it supervises the VCC rail against its fixed 3.0V threshold while simultaneously monitoring an external voltage (e.g., 5V analog supply or 1.8V core rail) via the RESET IN pin using a resistor divider referenced to 1.235V - as specified in the Dual-Voltage Monitoring section and Selector Guide.

What is the minimum VCC voltage at which MAX6750KA30+T guarantees valid RESET output?

The MAX6750KA30+T guarantees correct RESET logic state (push-pull high/low) for VCC ≥ 1.0V, per Electrical Characteristics table. Below 1.0V, RESET may become indeterminate; however, the device remains functional down to VCC = 1.2V (min operating voltage), and RESET deassertion is guaranteed once VCC rises above the 3.0V threshold plus hysteresis.

How is the reset timeout period calculated for MAX6750KA30+T?

The reset timeout period (tRP) for MAX6750KA30+T is calculated as tRP = 4.94 × 10⁶ × CSRT, where CSRT is the capacitor value in farads connected between SRT pin and GND. For example, a 1000pF capacitor yields tRP ≈ 4.94ms (typical), and a 1500pF capacitor yields ≈7.41ms - values verified in the Electrical Characteristics table under "Reset Timeout Period".