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 user-adjustable RSTIN input (488mV threshold), push-pull active-low RESET output, no manual reset pin, and 150ms minimum reset timeout period. It monitors primary I/O supply (VCC1), secondary core supply (VCC2), and an external voltage via RSTIN in space-constrained portable systems.

For engineers reviewing the MAX6743XKTGD3 datasheet, MAX6743XKTGD3 pinout, MAX6743XKTGD3 application, or MAX6743XKTGD3 equivalent, key selection criteria include its SC70-5 package, dual fixed + single adjustable monitoring capability, 6µA supply current, -40°C to +85°C operation, and absence of MR/PFI/POK functions - distinguishing it from other MAX6736–MAX6745 variants.

Technical Context

The MAX6743XKTGD3 implements a triple-supply supervisory architecture with independent comparators for VCC1 (3.075V), VCC2 (2.313V), and RSTIN (488mV), each with 0.5% hysteresis. Reset assertion occurs when any monitored voltage falls below its threshold and remains asserted for ≥150ms after all voltages recover.

Its push-pull RESET output is referenced to VCC1 and drives high to ≥0.8×VCC1 (ISOURCE = 800µA) and low to ≤0.4V (ISINK = 3.2mA). The RSTIN input accepts externally divided voltages down to 0.5V with ≤10nA leakage, enabling precise third-supply monitoring without additional components.

Key Specifications

Pinout & Package

Package: 5-pin SC70 (2.0mm × 2.1mm, 0.65mm pitch), surface-mount, lead-free compatible.

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 board space and simplifies layout by eliminating the pullup resistor, but forfeits manual reset capability; compared with TPS3808G33DBVR, it adds critical RSTIN flexibility and cuts supply current by 50%, at the cost of slightly tighter placement constraints in SC70.

Availability

MAX6743XKTGD3 is available at Aetrix Electronics and suitable for portable medical devices, multivoltage embedded controllers, wearable sensor hubs, low-power edge AI nodes, and industrial PLC modules requiring stable component supply across extended temperature ranges.

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 and mixed-signal ICs for power, sensing, connectivity, and security applications.

The MAX6736–MAX6745 family delivers ultra-low-power, multi-rail supervisory circuits optimized for battery-operated and space-constrained systems where reliability, small size, and minimal current draw are critical.

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 precise 488mV internal reference. When the voltage at RSTIN falls below this level, the device asserts its active-low RESET output. It enables monitoring of a third supply rail (e.g., 1.2V, 1.8V, or 5V) using an external resistor divider, extending supervision beyond the two factory-trimmed thresholds (VCC1 = 3.075V, VCC2 = 2.313V). This feature is integral to the MAX6743XKTGD3's triple-supply capability.

Does the MAX6743XKTGD3 include a manual reset (MR) input?

No, the MAX6743XKTGD3 does not include a manual reset (MR) input. Its pinout consists solely of RESET, GND, VCC2, RSTIN, and VCC1 - omitting the MR pin found on variants like MAX6736 or MAX6740. This design choice reduces pin count and simplifies layout for applications where software- or power-cycle-initiated reset suffices. If manual reset functionality is required, the MAX6740XKTGD3 is a direct alternative with identical thresholds and timeout.

What are the exact reset threshold voltages for MAX6743XKTGD3?

The MAX6743XKTGD3 has two factory-trimmed reset thresholds: VTH1 = 3.075V for VCC1 (I/O supply) and VTH2 = 2.313V for VCC2 (core supply), both with ±2.5% tolerance over -40°C to +85°C. Its RSTIN input uses a fixed 488mV internal reference (±1.5%), allowing external voltage monitoring via resistor division. These values are confirmed by the "TZ" suffix in the part number and Table 1 of the MAX6736–MAX6745 datasheet.

Can the MAX6743XKTGD3 be used in automotive applications?

The MAX6743XKTGD3 is rated for -40°C to +85°C operation and is not AEC-Q200 qualified. While its temperature range covers many under-hood or cabin environments, it lacks automotive-specific qualification, fault reporting, or enhanced ESD robustness. For automotive applications requiring formal qualification, consider AEC-Q200-certified alternatives such as the NCV33163 or TLV809 series. The MAX6743XKTGD3 remains suitable for industrial, medical, and consumer portable equipment.

What is the reset timeout period of the MAX6743XKTGD3 and how is it determined?

The MAX6743XKTGD3 has a minimum reset timeout period of 150ms, indicated by the "D3" suffix in its part number per Table 3 of the datasheet. 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 for reliable initialization. The actual timeout varies ±50% with temperature (see Figure toc04), remaining within 150ms–300ms across its full operating range.