Analog Devices Inc./Maxim Integrated MAX6743XKTGD3+

Overview

The MAX6743XKTGD3+ from Maxim Integrated is a triple-voltage microprocessor supervisor IC with two factory-trimmed reset thresholds (VTH1 = 3.075V, VTH2 = 2.313V) and one adjustable RSTIN input (488mV threshold), push-pull active-low RESET output, no manual reset pin, and 150ms minimum reset timeout. It monitors dual supply rails (VCC1/VCC2) in portable, multivoltage embedded systems requiring precise power sequencing and fault detection.

For engineers reviewing the MAX6743XKTGD3+ datasheet, MAX6743XKTGD3+ pinout, MAX6743XKTGD3+ application, or MAX6743XKTGD3+ equivalent, key selection criteria include its SC70-5 package, -40°C to +85°C operation, 6µA supply current, triple-supply monitoring capability, and absence of MR/PFI/POK pins - distinguishing it from MAX6740/MAX6744 variants.

Technical Context

The MAX6743XKTGD3+ implements a triple-supply supervisory architecture with independent comparators for VCC1, VCC2, and RSTIN, each referenced to precision internal bandgap references. Its reset assertion logic triggers when any monitored voltage falls below its respective threshold and holds RESET low for ≥150ms after all voltages recover.

It features a push-pull RESET output referenced to VCC1, eliminating external pull-up requirements, and supports adjustable monitoring down to 0.488V via resistor-divider on RSTIN. No power-fail comparator, POK output, or manual reset input is integrated - confirmed by pin configuration and Selector Guide.

Key Specifications

Pinout & Package

Package: 5-pin SC70 (2.0mm × 1.25mm, 0.65mm pitch), surface-mount, lead-free (indicated by '+' suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6740XKTGD3+, the MAX6743XKTGD3+ saves one external component (pull-up resistor) and removes MR-related routing complexity; versus TPS3808G33DBVR, it adds critical third-rail monitoring in identical board area - making it optimal for compact multivoltage SoC platforms.

Availability

MAX6743XKTGD3+ is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC I/O modules, automotive infotainment head units, and edge AI sensor nodes requiring stable component supply across extended temperature ranges and ultra-low power consumption.

Supply support for MAX6743XKTGD3+ 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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX6736–MAX6745 family delivers low-power, space-efficient µP supervision for multivoltage embedded systems - specifically engineered to replace discrete reset solutions in battery-powered and thermally constrained designs.

FAQ

What is the function of the RSTIN pin on the MAX6743XKTGD3+?

The RSTIN pin on the MAX6743XKTGD3+ is an adjustable reset threshold input with a fixed 488mV internal reference. When the voltage applied to RSTIN falls below 488mV, the device asserts the RESET output. It is typically used with an external resistor divider to monitor a third supply rail - for example, a 3.7V battery can be scaled to trigger reset at 3.0V using appropriate resistors. The MAX6743XKTGD3+ datasheet specifies RSTIN input current ≤±10nA, enabling high-impedance divider networks that minimize system power draw.

Does the MAX6743XKTGD3+ support manual reset functionality?

No, the MAX6743XKTGD3+ does not include a manual reset (MR) input. Its pinout (RESET, GND, VCC2, RSTIN, VCC1) confirms the absence of an MR terminal - consistent with the Selector Guide indicating "-" under MANUAL RESET for MAX6743. Unlike MAX6740/MAX6741 variants, the MAX6743XKTGD3+ relies solely on supply voltage monitoring for reset assertion. If hardware-initiated reset is required, an external circuit (e.g., pushbutton driving RESET low) would be necessary, but this bypasses the device's built-in timing and could violate µP reset specifications.

What are the exact reset threshold voltages for MAX6743XKTGD3+?

The MAX6743XKTGD3+ has two factory-trimmed reset thresholds: VTH1 = 3.075V for VCC1 and VTH2 = 2.313V for VCC2, both specified over -40°C to +85°C with ±75mV tolerance. These values are defined by the "TG" suffix per Table 1 of the datasheet. The RSTIN threshold is fixed at 488mV ±19mV. All thresholds are internally generated and do not require external components. The MAX6743XKTGD3+ does not incorporate PFI, PFO, or POK1 functions - confirming its role strictly as a triple-supply supervisor without power-fail or sequencing outputs.

Can the MAX6743XKTGD3+ monitor a negative supply voltage?

No, the MAX6743XKTGD3+ cannot directly monitor negative supply voltages. Its inputs - VCC1, VCC2, and RSTIN - are designed for positive-supply monitoring only and require voltages ≥0V relative to GND. While the broader MAX6736–MAX6745 family includes parts like MAX6742/MAX6745 with PFI inputs capable of negative monitoring (via external level-shifting circuits), the MAX6743XKTGD3+ lacks PFI/PFO pins entirely. Attempting to apply negative voltage to RSTIN, VCC1, or VCC2 violates Absolute Maximum Ratings and risks permanent damage.

What is the purpose of the D3 suffix in MAX6743XKTGD3+?

The "D3" suffix in MAX6743XKTGD3+ denotes the reset timeout period option: 150ms minimum (with typical 225ms and maximum 300ms). This value is specified in Table 3 of the datasheet and applies to the VCC reset timeout (tRP). The D3 timing ensures the RESET signal remains asserted long enough for microprocessors to complete internal power-on reset sequences - critical for reliable boot in ARM Cortex-M and RISC-V SoCs. The "+" indicates lead-free packaging compliant with RoHS directives, while "T" (omitted here due to "+") would indicate standard tape-and-reel packaging.