Analog Devices Inc./Maxim Integrated MAX6743XKYHD3

Overview

The MAX6743XKYHD3 from Maxim Integrated is a triple-voltage microprocessor supervisor IC with two factory-trimmed reset thresholds (VTH1 = 2.188V, 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, draws only 6µA total quiescent current, and delivers 150ms minimum reset timeout - ideal for space-constrained, battery-powered multivoltage systems requiring precise supply monitoring.

For engineers reviewing the MAX6743XKYHD3 datasheet, MAX6743XKYHD3 pinout, MAX6743XKYHD3 application, or MAX6743XKYHD3 equivalent, this device serves as a compact, low-power supervisory solution for dual-core/I/O voltage sequencing in portable controllers, GPS modules, and POS terminals where guaranteed reset assertion during brownout and minimal supply current are critical selection criteria.

Technical Context

The MAX6743XKYHD3 monitors three independent voltage rails: primary VCC1 (threshold 2.188V), secondary VCC2 (threshold 1.575V), and adjustable RSTIN (488mV internal reference). Reset assertion occurs if any monitored rail falls below its threshold and remains asserted for ≥150ms after all rails recover above their thresholds.

It features a push-pull RESET output referenced to VCC1, eliminating need for external pullup; no MR, PFI, PFO, or POK1 pins - confirming pure triple-supply monitoring without sequencing or manual reset functions. The SC70-5 package supports high-density PCB layouts in industrial and portable applications operating across –40°C to +85°C.

Key Specifications

Pinout & Package

MAX6743XKYHD3 is housed in a 5-pin SC70 package (2.0mm × 1.25mm, 0.65mm pitch), 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-supply monitoring applications.

Compared with MAX6743XKYHD3, MAX6740XKYHD3 adds manual reset and open-drain flexibility at the cost of external component overhead, while TPS3808G33DBVR offers lower power but sacrifices the critical third adjustable monitoring channel needed for heterogeneous multivoltage designs.

Availability

MAX6743XKYHD3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld terminals, GPS tracking modules, and POS payment terminals requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for MAX6743XKYHD3 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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX6736–MAX6745 family was designed specifically for low-power, multivoltage microprocessor supervision in space-constrained portable and embedded systems - emphasizing ultra-low IQ, factory-trimmed accuracy, and SC70 packaging.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6743XKYHD3?

The MAX6743XKYHD3 has a factory-trimmed VCC1 reset threshold of 2.188V, with ±2.5% tolerance over the full –40°C to +85°C temperature range. This value is confirmed in Table 1 of the official datasheet under suffix "Y", and applies specifically to the MAX6743XKYHD3 variant - not inferred from other members of the MAX6736–MAX6745 family.

Does the MAX6743XKYHD3 include a manual reset (MR) input pin?

No, the MAX6743XKYHD3 does not include a manual reset (MR) input. Its pinout consists solely of RESET, GND, VCC2, RSTIN, and VCC1 - as verified in the Pin Configurations diagram (page 15) and Selector Guide (page 14). MR functionality is present only on MAX6736–MAX6739 and selected variants like MAX6740/MAX6741, but explicitly excluded from MAX6743XKYHD3.

What is the function of the RSTIN pin on the MAX6743XKYHD3?

The RSTIN pin on the MAX6743XKYHD3 accepts an externally divided voltage and compares it against an internal 488mV reference. When the applied voltage drops below this threshold, RESET is asserted. This enables monitoring of a third supply rail (e.g., 2.8V display, 5V peripheral) using a simple resistor divider - a confirmed feature documented in the General Description and Pin Description sections.

Is the RESET output of the MAX6743XKYHD3 push-pull or open-drain?

The MAX6743XKYHD3 features a push-pull RESET output, as confirmed in the Selector Guide (page 14) and Pin Description (page 8). Unlike open-drain variants (e.g., MAX6736), this eliminates the need for an external pullup resistor and allows direct interfacing with µP reset inputs requiring active drive in both high and low states.

What is the guaranteed minimum reset timeout period for the MAX6743XKYHD3?

The MAX6743XKYHD3 guarantees a minimum reset timeout period of 150ms, as indicated by the "D3" suffix in its part number and confirmed in Table 3 (VCC Timeout Period Suffix Guide) and Electrical Characteristics (tRP parameter, page 4). This timeout begins after all monitored supplies exceed their thresholds and is stable across temperature and supply voltage variations.