Analog Devices Inc./Maxim Integrated MAX6743XKSHD3

Overview

The MAX6743XKSHD3 from Maxim Integrated is a triple-voltage microprocessor supervisor IC with two factory-trimmed reset thresholds (VTH1 = 2.925V, VTH2 = 2.188V) and one user-adjustable RSTIN input (488mV threshold), push-pull active-low RESET output, no manual reset pin, and SC70-5 package. It monitors primary I/O supply (VCC1), secondary core supply (VCC2), and an external voltage via resistor divider, asserting reset if any falls below its threshold and holding it for ≥150ms after recovery. It is used in multivoltage portable systems requiring precise, low-power supply monitoring.

For engineers reviewing the MAX6743XKSHD3 datasheet, MAX6743XKSHD3 pinout, MAX6743XKSHD3 application, or MAX6743XKSHD3 equivalent, key selection considerations include its triple-supply monitoring capability, 2.925V/2.188V fixed thresholds, 488mV adjustable RSTIN input, 150ms reset timeout, 6µA quiescent current, and push-pull RESET output - all in a space-saving 5-pin SC70 package.

Technical Context

The MAX6743XKSHD3 implements a triple-supply supervisory architecture with independent comparators for VCC1, VCC2, and RSTIN, each referenced to precision internal bandgap references. Its reset logic asserts RESET low when any monitored voltage drops below its respective threshold and maintains assertion for a guaranteed minimum 150ms after all voltages exceed their thresholds.

It features a push-pull RESET output referenced to VCC1, eliminating need for external pull-up resistors, and supports monitoring down to 0.488V on RSTIN using external resistor dividers. The device operates across -40°C to +85°C and draws only 6µA total supply current, enabling use in battery-powered applications where leakage and power budget are critical.

Key Specifications

Pinout & Package

MAX6743XKSHD3 is housed in a 5-pin SC70-5 package (2.0mm × 1.25mm, 0.65mm pitch), optimized for high-density portable designs. Pin 1 is RESET (push-pull active-low), Pin 2 is GND, Pin 3 is VCC2, Pin 4 is RSTIN (adjustable reset input), and Pin 5 is VCC1 (primary supply input).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple-voltage supervisory applications.

Compared with MAX6743XKSHD3, MAX6740XKSHD3 adds manual reset but requires external pull-up, while TPS3808G33DBVR offers lower cost for dual-rail-only systems but sacrifices RSTIN flexibility and doubles quiescent current - making MAX6743XKSHD3 optimal for compact triple-supply designs demanding ultra-low power and push-pull simplicity.

Availability

MAX6743XKSHD3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, handheld test equipment, and automotive infotainment subsystems requiring stable component supply, long-term lifecycle support, and guaranteed factory-trimmed voltage thresholds.

Supply support for MAX6743XKSHD3 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, communications, and consumer applications.

The MAX6736–MAX6745 family was designed specifically for low-power, multivoltage microprocessor supervision in space- and energy-constrained portable and embedded systems - delivering precision thresholds, minimal current draw, and compact packaging without sacrificing reliability.

FAQ

What are the factory-trimmed reset thresholds for MAX6743XKSHD3?

The MAX6743XKSHD3 has two factory-trimmed reset thresholds: VTH1 = 2.925V for VCC1 (I/O supply) and VTH2 = 2.188V for VCC2 (core supply), both with ±2.5% tolerance over -40°C to +85°C. These values are encoded in the "SH" suffix per Maxim's ordering guide and are laser-trimmed during production for high accuracy without external calibration.

Does MAX6743XKSHD3 include a manual reset (MR) input?

No, the MAX6743XKSHD3 does not include a manual reset (MR) input. Per the pin configuration and selector guide, MAX6743 variants feature RESET, GND, VCC2, RSTIN, and VCC1 pins - with no dedicated MR terminal. For manual reset capability, consider MAX6740XKSHD3, which shares identical thresholds and RSTIN but adds MR and uses open-drain RESET.

What is the function of the RSTIN pin on MAX6743XKSHD3?

The RSTIN pin on MAX6743XKSHD3 is an adjustable reset input referenced to an internal 0.488V threshold. When the voltage at RSTIN falls below 0.488V, RESET is asserted. It is intended for monitoring a third supply (e.g., battery, reference, or auxiliary rail) using an external resistor divider - enabling flexible triple-supply supervision without adding discrete components.

What is the reset timeout period for MAX6743XKSHD3?

The MAX6743XKSHD3 has a minimum reset timeout period of 150ms, indicated by the "D3" suffix in its part number. This timeout begins after all monitored supplies (VCC1, VCC2, RSTIN) rise above their respective thresholds and ensures the microprocessor receives a sufficiently long reset pulse to complete internal initialization, meeting typical µP reset timing requirements.

Is MAX6743XKSHD3 compatible with 1.8V core supplies?

Yes, MAX6743XKSHD3 is compatible with 1.8V core supplies. Its VCC2 input accepts voltages from 1.0V to 5.5V, and its factory-trimmed VTH2 = 2.188V is suitable for supervising 2.5V or 2.2V rails. For direct 1.8V core monitoring, use the RSTIN pin with a resistor divider to scale the 1.8V rail down to ≤0.488V - enabling precise undervoltage detection at the actual core voltage level.