Analog Devices Inc./Maxim Integrated MAX6743XKWGD3+

Overview

The MAX6743XKWGD3+ from Maxim Integrated is a triple-voltage microprocessor supervisor IC with two factory-trimmed reset thresholds (VTH1 = 2.925V, VTH2 = 1.575V) and one user-adjustable RSTIN input (488mV threshold), push-pull active-low RESET output, no manual reset pin, and no power-fail or POK functionality. It operates from 1.2V to 5.5V supply range, draws only 6µA total quiescent current, and delivers a 150ms minimum reset timeout - ideal for space-constrained, battery-powered multivoltage systems such as portable medical monitors and low-power IoT edge nodes.

For engineers reviewing the MAX6743XKWGD3+ datasheet, MAX6743XKWGD3+ pinout, MAX6743XKWGD3+ application, or MAX6743XKWGD3+ equivalent, key selection criteria include its SC70-5 package footprint, triple-supply monitoring capability with fixed + adjustable thresholds, push-pull RESET drive strength (VOH ≥ 0.8×VCC1 at 800µA), guaranteed operation over –40°C to +85°C, and absence of MR/PFI/POK pins per its specific variant configuration.

Technical Context

The MAX6743XKWGD3+ implements a triple-supply supervisory architecture monitoring VCC1 (primary I/O rail), VCC2 (secondary core rail), and RSTIN (user-defined third rail via resistor divider). Its internal comparators reference precision 488mV and factory-trimmed voltage thresholds, with hysteresis of 0.5% to reject noise-induced false resets.

Reset assertion occurs when any monitored voltage falls below its threshold; deassertion requires all three voltages to exceed their thresholds simultaneously for the full 150ms timeout period. The push-pull RESET output drives high to VCC1 (not open-drain), eliminating need for external pull-up resistors in most µP interface configurations.

Key Specifications

Pinout & Package

MAX6743XKWGD3+ is housed in a 5-pin SC70-5 (SOT-353) package measuring 2.0mm × 2.1mm × 0.95mm, optimized for ultra-compact PCB layouts in portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6743XKWGD3+, MAX6740XKWGD3+ adds manual reset and open-drain flexibility at the cost of requiring an external pull-up, while TPS3808G33DBVR reduces current draw but sacrifices triple-supply capability and design compatibility.

Availability

MAX6743XKWGD3+ is available at Aetrix Electronics and suitable for portable medical monitors, low-power IoT edge nodes, and industrial handheld terminals requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6743XKWGD3+ 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 in industrial, automotive, and computing markets.

The MAX6736–MAX6745 family delivers ultra-low-power, multi-rail µP supervision in miniature SC70 packages - engineered specifically for battery-operated and space-constrained embedded systems needing reliable power integrity monitoring.

FAQ

What is the function of the RSTIN pin on the MAX6743XKWGD3+?

The RSTIN pin on the MAX6743XKWGD3+ serves as an adjustable reset threshold input with a precise 488mV internal reference. When the voltage at RSTIN falls below this threshold - typically set via an external resistor divider from a third supply rail - the device asserts its active-low RESET output. This enables monitoring of a third voltage (e.g., 2.8V display supply or 0.9V ultra-low-power domain) without requiring additional supervisor ICs. The MAX6743XKWGD3+ uses RSTIN as its third monitored input alongside VCC1 and VCC2.

Does the MAX6743XKWGD3+ include a manual reset (MR) input?

No, the MAX6743XKWGD3+ does not include a manual reset (MR) input. Per the Pin Configuration diagram and Selector Guide, MAX6743 variants use pins 1–5 as RESET, GND, VCC2, RSTIN, and VCC1 - with no dedicated MR pin. This distinguishes it from MAX6736–MAX6739 and MAX6740/MAX6741 variants that allocate pin 3 to MR. If manual reset functionality is required, the MAX6740XKWGD3+ (same thresholds/timing, open-drain RESET, MR pin present) is the recommended alternative.

What are the exact reset threshold voltages for MAX6743XKWGD3+?

The MAX6743XKWGD3+ has factory-trimmed reset thresholds of VTH1 = 2.925V for VCC1 and VTH2 = 1.575V for VCC2, as defined by the "WV" suffix per Table 1 in the datasheet. These values are guaranteed over –40°C to +85°C with ±2.5% tolerance. Additionally, the RSTIN input triggers reset when its voltage falls below 488mV (±1.5%), enabling precise third-rail monitoring. All three thresholds operate independently and simultaneously - RESET asserts if any one falls out of specification.

Is the RESET output of MAX6743XKWGD3+ push-pull or open-drain?

The RESET output of MAX6743XKWGD3+ is push-pull active-low. Unlike MAX6736/MAX6738/MAX6740 variants with open-drain outputs, the MAX6743XKWGD3+ drives RESET high to VCC1 (VOH ≥ 0.8×VCC1 at 800µA source current) and low to GND (VOL ≤ 0.4V at 3.2mA sink). This eliminates the need for an external pull-up resistor and simplifies interface to microprocessors with unidirectional reset inputs. The push-pull architecture is confirmed in the Pin Description table and Selector Guide for MAX6743/MAX6744 variants.

What package type and dimensions does MAX6743XKWGD3+ use?

The MAX6743XKWGD3+ uses a 5-pin SC70-5 (SOT-353) package measuring 2.0mm × 2.1mm × 0.95mm with a 0.65mm pin pitch. This ultra-compact outline is specified in the Ordering Information section and Pin Configurations diagram. The SC70-5 footprint saves significant PCB area versus larger alternatives like SOT-23-6 or MSOP-8, making it ideal for wearables, hearing aids, and other size-constrained applications where board space is at a premium. The device is lead-free and RoHS-compliant.