Analog Devices Inc./Maxim Integrated MAX6744XKWGD3

Overview

The MAX6744XKWGD3 from Maxim Integrated is a dual-voltage microprocessor supervisor IC with push-pull reset output, VCC1 power-OK (POK1) output, and factory-trimmed reset thresholds of 1.665V (VTH1) and 2.925V (VTH2). It monitors I/O and core supply rails in multivoltage systems, asserts reset when either supply falls below its threshold, and maintains reset for ≥150ms after recovery. Designed for power-supply sequencing in portable and battery-powered equipment, it operates from -40°C to +85°C in a 5-pin SC70 package.

For engineers reviewing the MAX6744XKWGD3 datasheet, MAX6744XKWGD3 pinout, MAX6744XKWGD3 application, or MAX6744XKWGD3 equivalent, key selection criteria include its dual fixed-threshold supervision (1.665V/2.925V), 150ms reset timeout, POK1 output for controlled VCC1-to-VCC2 sequencing, push-pull RESET drive capability, and ultra-low 6µA supply current - all critical for low-power embedded and portable designs.

Technical Context

The MAX6744XKWGD3 implements two independent voltage comparators with precision internal references (1.665V and 2.925V) to monitor VCC1 and VCC2 simultaneously. Its POK1 output deasserts only after VCC1 exceeds 1.665V for ≥37.5ms, enabling reliable power-up sequencing control without external timing components.

Reset assertion is synchronized across both monitored supplies and includes built-in hysteresis (0.5%) and transient immunity up to 100mV overdrive. The push-pull RESET output drives high to ≥0.8×VCC1 at 800µA, eliminating need for external pullup resistors in most µP interface configurations.

Key Specifications

Pinout & Package

MAX6744XKWGD3 is housed in a 5-pin SC70-5 package (2.0mm × 1.25mm, 0.65mm pitch), optimized for high-density portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-voltage supervisor applications.

Compared with MAX6741XKWGD3, the MAX6744XKWGD3 adds POK1 sequencing and push-pull RESET - reducing component count and enabling tighter power-up control. Versus TPS3808G16DBVR, it delivers true dual-rail supervision in one device, avoiding layout complexity and timing mismatches from cascaded supervisors.

Availability

MAX6744XKWGD3 is available at Aetrix Electronics and suitable for portable medical sensors, notebook power management, industrial PLC I/O modules, and POS terminal power control requiring stable component supply and long-term production continuity.

Supply support for MAX6744XKWGD3 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and consumer applications.

The MAX6736–MAX6745 family was designed specifically for low-power, multivoltage microprocessor supervision in space- and energy-constrained portable systems - emphasizing ultra-low ICC, small SC70 packaging, and integrated sequencing features like POK1.

FAQ

What are the exact reset threshold voltages for MAX6744XKWGD3?

The MAX6744XKWGD3 has factory-trimmed reset thresholds of 1.665V for VCC1 and 2.925V for VCC2, as indicated by the "W" and "S" suffixes in its part number per Maxim's Table 1. These values are guaranteed over the full -40°C to +85°C operating temperature range with ±1.5% tolerance, enabling accurate supervision of common 1.8V core and 3.3V I/O supply rails.

Does MAX6744XKWGD3 require external pullup resistors for its RESET output?

No, MAX6744XKWGD3 features a push-pull RESET output that actively drives both high and low states. It sources up to 800µA at 0.8×VCC1 and sinks up to 3.2mA, eliminating the need for external pullup resistors - unlike open-drain variants such as MAX6741XKWGD3. This simplifies schematic design and improves signal integrity on µP reset lines.

How does the POK1 output function in MAX6744XKWGD3?

The POK1 output in MAX6744XKWGD3 is an open-drain active-high signal that remains low until VCC1 exceeds its 1.665V threshold for ≥37.5ms. Once asserted, POK1 can directly enable a downstream DC/DC converter (e.g., VCC2 regulator) via an external pullup. Its timing is independent of VCC2 and MR, making it ideal for strict power-up sequencing in dual-rail systems.

What is the reset timeout period for MAX6744XKWGD3, and is it adjustable?

The MAX6744XKWGD3 has a fixed minimum reset timeout period of 150ms (D3 suffix), guaranteed over temperature and supply voltage. This value is factory-programmed and not user-adjustable. The timeout begins only after both VCC1 and VCC2 exceed their respective thresholds and is retriggered if either supply dips below threshold before completion.

Can MAX6744XKWGD3 monitor a 1.2V core supply?

Yes, MAX6744XKWGD3 can monitor a 1.2V core supply by connecting it to the VCC2 pin and using an external resistor divider to scale the 2.925V threshold down to 1.2V (e.g., R1 = 1.45MΩ, R2 = 1MΩ yields ~1.2V trip point). The device's VCC2 input accepts voltages from 0.9V to 3.3V, and the internal comparator maintains accuracy even with scaled inputs.