Analog Devices Inc./Maxim Integrated MAX6743XKSYD3

Overview

MAX6743XKSYD3 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 operates from -40°C to +85°C in a 5-pin SC70 package. 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 fault detection.

For engineers reviewing the MAX6743XKSYD3 datasheet, MAX6743XKSYD3 pinout, MAX6743XKSYD3 application, or MAX6743XKSYD3 equivalent, key selection criteria include its triple-supply monitoring capability, 150ms minimum reset timeout, 6µA quiescent current, SC70 footprint constraints, and absence of MR/PFI/POK functions - distinguishing it from sibling parts like MAX6740 or MAX6741.

Technical Context

The MAX6743XKSYD3 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 - with timer restart on subsequent dips.

It uses BiCMOS process technology (249 transistors), supports VCC1 from 1.2V–5.5V and VCC2 from 0.9V–3.3V, features 0.5% threshold hysteresis, and delivers push-pull RESET referenced to VCC1 - eliminating need for external pullup while ensuring clean, rail-to-rail output drive into µP reset inputs.

Key Specifications

Pinout & Package

MAX6743XKSYD3 is housed in a 5-pin SC70-5 package (2.0mm × 2.1mm, 0.65mm pitch), with pins arranged as follows (top view): Pin 1 = RESET, Pin 2 = GND, Pin 3 = VCC2, Pin 4 = RSTIN, Pin 5 = VCC1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6743XKSYD3, MAX6740XKSYD3 offers manual reset detect but requires external pullup and lacks push-pull drive, while TPS3808G33DBVR reduces current draw by 73% but sacrifices the critical third-voltage monitoring capability needed for complex multirail systems.

Availability

MAX6743XKSYD3 is available at Aetrix Electronics and suitable for portable equipment, multivoltage systems, and battery-powered controllers requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for MAX6743XKSYD3 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 management, sensing, and interface applications in industrial, automotive, and consumer markets.

The MAX6736–MAX6745 family was engineered specifically for low-power, space-constrained multivoltage systems - delivering integrated triple-supply supervision in sub-2mm² SC70 packages with factory-trimmed accuracy and µA-level quiescent current.

FAQ

What is the exact reset threshold voltage for VCC1 on MAX6743XKSYD3?

The MAX6743XKSYD3 has a factory-trimmed VCC1 reset threshold of 2.925V ±2.5% over the full -40°C to +85°C temperature range. This value is encoded in the "SY" suffix per Table 1 of the datasheet and applies specifically to the MAX6743 variant with D3 (150ms) timeout. The threshold is internally generated and does not require external components.

Does MAX6743XKSYD3 include a manual reset input (MR) pin?

No, MAX6743XKSYD3 does not include a manual reset input pin. As confirmed by the Pin Description table and Selector Guide, MAX6743 is configured with RESET, GND, VCC2, RSTIN, and VCC1 pins only - omitting MR, PFI, PFO, and POK1 functions present in other family members like MAX6736 or MAX6741.

What is the function of the RSTIN pin on MAX6743XKSYD3?

The RSTIN pin on MAX6743XKSYD3 provides an adjustable reset input with a precise 488mV internal reference threshold. When the voltage applied to RSTIN falls below this level, the device asserts the RESET output. It is typically used with an external resistor divider to monitor a third supply rail - such as a battery or auxiliary voltage - down to 0.5V.

What package type and dimensions does MAX6743XKSYD3 use?

MAX6743XKSYD3 uses a 5-pin SC70-5 package measuring 2.0mm × 2.1mm with 0.65mm lead pitch. This ultra-small outline package is surface-mount compatible and optimized for high-density portable PCB layouts. The pinout is standardized across the MAX6736–MAX6745 family, with RESET on pin 1 and GND on pin 2.

How does the reset timeout behavior work on MAX6743XKSYD3?

MAX6743XKSYD3 provides a minimum 150ms reset timeout period (D3 suffix) that begins after all monitored supplies (VCC1, VCC2, RSTIN) exceed their respective thresholds. If any supply dips below its threshold before timeout completes, the internal timer restarts. This ensures robust immunity to transient supply glitches while guaranteeing sufficient hold time for reliable µP initialization.