Analog Devices Inc./Maxim Integrated MAX6723UTYHD3+

Overview

MAX6723UTYHD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (4.625V threshold), VCC2 (3.075V threshold), and an externally adjustable RSTIN input (626.5mV reference). It asserts active-low open-drain reset for ≥210ms after any supply drop, manual reset, or watchdog timeout, and operates from -40°C to +85°C. Used in multivoltage telecom and industrial systems requiring reliable power-up sequencing and brownout protection.

For engineers reviewing the MAX6723UTYHD3+ datasheet, MAX6723UTYHD3+ pinout, MAX6723UTYHD3+ application, or MAX6723UTYHD3+ equivalent, key selection factors include its dual-supply monitoring with factory-trimmed thresholds, 210ms reset timeout, open-drain RST output referenced to VCC1, RSTIN-based third-voltage monitoring down to 0.62V, and guaranteed reset validity with VCC1 or VCC2 ≥ 0.8V.

Technical Context

The MAX6723UTYHD3+ implements a triple-monitoring architecture: primary supply (VCC1) and secondary supply (VCC2) are monitored by internal comparators with factory-trimmed thresholds (4.625V and 3.075V respectively), while RSTIN provides high-impedance auxiliary voltage monitoring using a 626.5mV internal reference. Reset assertion is latched and held for a minimum 210ms timeout period after all monitored voltages recover.

It features no watchdog or power-fail functions - confirmed by Selector Guide and Pin Description tables - and includes only one manual reset input (MR) with 50kΩ internal pullup to VCC1. The open-drain RST output requires external pullup and remains valid down to VCC1 or VCC2 = 0.8V, enabling robust operation during deep brownouts.

Key Specifications

Pinout & Package

MAX6723UTYHD3+ uses a 6-pin SOT23 package with exposed pad (non-thermal). Pin functions are validated per Maxim's official Pin Description table for MAX6723 series.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6723UTYHD3+, MAX6724UTYHD3+ offers push-pull drive for simplified layout but loses open-drain flexibility, while TPS3808G33DBVR reduces supply current by 82% but sacrifices triple-monitoring capability and requires redesign to add RSTIN functionality.

Availability

MAX6723UTYHD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and portable medical devices requiring stable component supply, long-term lifecycle support, and guaranteed factory-trimmed voltage thresholds.

Supply support for MAX6723UTYHD3+ 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 across industrial, automotive, and communications markets.

The MAX6715–MAX6729 family delivers ultra-low-voltage, multi-rail supervisory circuits optimized for space-constrained systems requiring simultaneous monitoring of primary, secondary, and auxiliary supplies with minimal external components.

FAQ

What is the exact reset threshold voltage for VCC1 on MAX6723UTYHD3+?

The MAX6723UTYHD3+ has a factory-trimmed VCC1 reset threshold of 4.625V (typical), with guaranteed range 4.500V to 4.750V at 25°C per the Reset Voltage Threshold Suffix Guide. This value is encoded in the 'Y' suffix and applies to falling VCC1 transitions only; hysteresis is 0.5% of VTH, yielding ~23mV separation between assert and deassert points.

Does MAX6723UTYHD3+ include a watchdog timer function?

No, MAX6723UTYHD3+ does not include a watchdog timer. Per Maxim's Selector Guide and Pin Description, the MAX6723 variant supports only triple-voltage monitoring (VCC1, VCC2, RSTIN), manual reset (MR), and open-drain reset output (RST). Watchdog functionality is reserved for MAX6721–MAX6729 parts with 'W' or 'WDI' pin designation - absent in MAX6723UTYHD3+.

What is the function of the RSTIN pin on MAX6723UTYHD3+ and how is it used?

The RSTIN pin on MAX6723UTYHD3+ is a high-impedance input compared against an internal 626.5mV reference. To monitor a third voltage (e.g., battery or auxiliary rail), connect it via resistor divider such that RSTIN = V_MON × R2/(R1+R2). When V_MON drops below V_{TH_EXT} = 626.5mV × (R1+R2)/R2, RST asserts. Input current is ±25nA, enabling high-value resistors for low power.

Can MAX6723UTYHD3+ operate with VCC1 below 1.8V?

Yes, MAX6723UTYHD3+ guarantees valid reset output logic state with VCC1 or VCC2 ≥ 0.8V, per Absolute Maximum Ratings and Detailed Description sections. However, VCC1 must be ≥ 0.8V for internal comparators to function - operation below this violates specification and may cause undefined reset behavior. The 4.625V threshold implies intended use with ≥4.5V rails.

What package type and dimensions does MAX6723UTYHD3+ use?

MAX6723UTYHD3+ uses a 6-pin SOT23 package (SOT23-6) measuring 2.9mm × 1.6mm × 1.1mm (L×W×H) with 0.95mm pin pitch. It is lead-free and RoHS-compliant, with thermal pad option available. Pin 1 is marked by dot; orientation follows JEDEC MO-178 standard, verified in Maxim's official package drawings for UT-series SOT23 devices.