Analog Devices Inc./Maxim Integrated MAX6723UTYHD3+T

Overview

MAX6723UTYHD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (adjustable third supply) with factory-trimmed thresholds of 4.625V (VTH1), 3.075V (VTH2), and 626.5mV reference for RSTIN. It asserts an active-low open-drain reset output with 210ms minimum timeout and supports manual reset input and watchdog timer functionality. It is used in multivoltage telecom power systems to ensure reliable µP boot and brownout recovery.

For engineers reviewing the MAX6723UTYHD3+T datasheet, MAX6723UTYHD3+T pinout, MAX6723UTYHD3+T application, or MAX6723UTYHD3+T equivalent, key selection criteria include dual-supply monitoring range (1.8–5.0V / 0.9–3.3V), adjustable third-voltage threshold down to 0.62V, guaranteed reset validity down to VCC = 0.8V, low 14µA typical supply current, and compatibility with noisy industrial environments via glitch immunity.

Technical Context

The MAX6723UTYHD3+T implements a triple-monitoring architecture: VCC1 and VCC2 are independently compared against factory-set thresholds (4.625V and 3.075V), while RSTIN uses an internal 626.5mV reference to monitor a third voltage via external resistor divider. Reset assertion is triggered by any monitored rail falling below its threshold, MR pull-down, or watchdog timeout.

It features an open-drain RST output referenced to VCC1, a manual reset input with 50kΩ internal pullup to VCC1, and a watchdog timer with dual-mode operation-35s min startup period followed by 1.12s min normal timeout. The device guarantees valid reset logic state when either VCC1 or VCC2 ≥ 0.8V, enabling robust low-voltage operation.

Key Specifications

Pinout & Package

MAX6723UTYHD3+T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), surface-mount, RoHS-compliant, lead-free (+T suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6723UTYHD3+T, MAX6724UTYHD3+T offers push-pull drive for direct µP interface but forfeits bus-sharing flexibility, while TPS3808G33DBVR reduces cost and complexity at the expense of triple-monitoring capability and design adaptability.

Availability

MAX6723UTYHD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control, and medical imaging systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for MAX6723UTYHD3+T 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 high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing markets.

The MAX6715–MAX6729 family was designed specifically for ultra-low-voltage, space-constrained multirail systems requiring precise, low-power supervision with configurable monitoring and robust reset timing.

FAQ

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

The MAX6723UTYHD3+T has a factory-trimmed VCC1 reset threshold of 4.625V (typical), with a guaranteed range of 4.500V to 4.750V across temperature and process variation. This value is encoded in the "YH" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies specifically to the MAX6723UTYHD3+T variant.

Does the MAX6723UTYHD3+T support watchdog functionality?

No, the MAX6723UTYHD3+T does not include a watchdog input. Per Maxim's Selector Guide, MAX6723 devices are triple-supervisors with RSTIN monitoring and manual reset, but lack WDI functionality. Watchdog capability begins with MAX6721 and higher part numbers (e.g., MAX6725/MAX6726). The MAX6723UTYHD3+T is functionally identical to MAX6723UTYHD3-T except for lead-free packaging.

What is the purpose of the RSTIN pin on the MAX6723UTYHD3+T?

The RSTIN pin on the MAX6723UTYHD3+T is a high-impedance input referenced to an internal 626.5mV comparator threshold, enabling monitoring of a third supply voltage (e.g., 1.2V, 1.8V, or 2.5V) via an external resistor divider. When the divided voltage falls below 626.5mV, the device asserts RST - allowing full triple-rail supervision without additional ICs.

Can the MAX6723UTYHD3+T operate with VCC1 below 1.8V?

Yes - the MAX6723UTYHD3+T guarantees correct reset output logic state as long as either VCC1 or VCC2 remains ≥ 0.8V. While VCC1 nominal range is 1.8V–5.0V, the device remains functional down to 0.8V on either supply rail, making it suitable for deep-brownout detection and low-voltage backup scenarios.

What package type and dimensions does the MAX6723UTYHD3+T use?

The MAX6723UTYHD3+T uses a 6-pin SOT23-6 package measuring 2.9mm × 1.6mm × 1.1mm (L × W × H), with gull-wing leads and RoHS-compliant lead-free terminations. Pin pitch is 0.95mm, and the package is optimized for reflow soldering in high-density PCB assemblies.