Analog Devices Inc./Maxim Integrated MAX6743XKRVD3+

Overview

MAX6743XKRVD3+ 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 - ideal for multivoltage portable systems requiring precise power sequencing and low-quiescent-current supervision.

For engineers reviewing the MAX6743XKRVD3+ datasheet, MAX6743XKRVD3+ pinout, MAX6743XKRVD3+ application, or MAX6743XKRVD3+ equivalent, key selection criteria include its SC70-5 package footprint, dual fixed + adjustable voltage monitoring capability, 6µA total supply current, -40°C to +85°C operation, and absence of MR/PFI/POK functions - distinguishing it from other MAX6736–MAX6745 family members.

Technical Context

The MAX6743XKRVD3+ 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 above threshold.

It uses BiCMOS process technology (249 transistors), supports VCC1 from 1.0V to 5.5V and VCC2 from 0.752V to 3.3V, and features 0.5% typical threshold hysteresis. The push-pull RESET output drives high to ≥0.8×VCC1 (ISOURCE = 800µA) and low to ≤0.4V (ISINK = 3.2mA), eliminating need for external pullup resistors.

Key Specifications

Pinout & Package

MAX6743XKRVD3+ is housed in a 5-pin SC70-5 package (2.0mm × 1.25mm, 0.65mm pitch), optimized for space-constrained portable designs. Pin 1 is RESET (push-pull active-low), Pin 2 is GND, Pin 3 is VCC2, Pin 4 is RSTIN, and Pin 5 is VCC1 - confirmed per Maxim's official pin configuration diagram for MAX6740/MAX6743 variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6740XKRVD3+, MAX6743XKRVD3+ offers push-pull RESET (no pullup needed) but omits manual reset detect; versus TPS3808G33DBVR, it adds RSTIN-based third-rail monitoring at higher IQ but greater design adaptability for multivoltage SoC platforms.

Availability

MAX6743XKRVD3+ is available at Aetrix Electronics and suitable for smartphone baseband power management, industrial PLC I/O modules, medical wearable sensor hubs, and automotive infotainment subsystems requiring stable component supply, long-lifecycle support, and guaranteed lead-free compliance.

Supply support for MAX6743XKRVD3+ 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 portable applications.

The MAX6736–MAX6745 product line delivers low-power, multivoltage µP supervisors in ultra-small SC70 packages - engineered specifically for space- and power-constrained embedded systems requiring reliable, factory-calibrated reset supervision.

FAQ

What is the exact reset timeout period of the MAX6743XKRVD3+?

The MAX6743XKRVD3+ has a guaranteed minimum reset timeout period of 150ms, with typical value 225ms and maximum 300ms over -40°C to +85°C. This timing begins after all monitored supplies (VCC1, VCC2, RSTIN) exceed their respective thresholds and ensures µP reset pulse compliance with industry-standard boot requirements. The D3 suffix in MAX6743XKRVD3+ explicitly denotes this 150ms option.

Does the MAX6743XKRVD3+ include a manual reset input (MR) pin?

No, the MAX6743XKRVD3+ does not include a manual reset input pin. Per Maxim's official pin configuration diagram for MAX6743, pins are assigned as RESET (1), GND (2), VCC2 (3), RSTIN (4), and VCC1 (5). Manual reset functionality is absent - unlike MAX6736–MAX6739 or MAX6740–MAX6742 variants - making MAX6743XKRVD3+ suitable for systems relying solely on supply-voltage-triggered reset.

What are the factory-trimmed voltage thresholds for VCC1 and VCC2 on the MAX6743XKRVD3+?

The MAX6743XKRVD3+ has factory-trimmed thresholds of 3.075V for VCC1 and 2.313V for VCC2, as confirmed by the "KR" and "V" suffixes in its part number per Maxim's Table 1. These values are specified over -40°C to +85°C with ±75mV tolerance (≤±2.5%), enabling robust supervision of standard 3.3V I/O and 2.5V/2.3V core supplies without external calibration.

Can the MAX6743XKRVD3+ monitor a third voltage below 1.0V?

Yes, the MAX6743XKRVD3+ can monitor a third voltage as low as 0.5V using its RSTIN pin, which has a fixed 488mV internal threshold. By connecting an external resistor divider between the target voltage rail and GND, with RSTIN tied to the divider midpoint, the device asserts RESET when the divided voltage falls below 488mV - enabling precise low-voltage battery or analog supply monitoring.

Is the RESET output of the MAX6743XKRVD3+ push-pull or open-drain?

MAX6743XKRVD3+ features a push-pull active-low RESET output, as confirmed by Maxim's Selector Guide and Pin Description table. This eliminates the need for an external pullup resistor, provides rail-to-rail drive capability (VOH ≥0.8×VCC1, VOL ≤0.4V), and ensures fast, deterministic reset signaling to microprocessors - distinguishing it from open-drain variants like MAX6740XKRVD3+.