Analog Devices Inc./Maxim Integrated MAX6723UTYHD3

Overview

MAX6723UTYHD3 from Maxim Integrated is a dual-voltage microprocessor supervisory IC with factory-trimmed reset thresholds (VTH1 = 3.075V, VTH2 = 1.665V), 210ms minimum reset timeout, and adjustable RSTIN input for third-voltage monitoring down to 0.626V. It features open-drain active-low RST output, manual-reset input (MR), watchdog timer (35s startup / 1.12s normal), and operates from -40°C to +125°C in a 6-pin SOT23 package. Used in telecom power management to ensure reliable boot and brownout recovery.

For engineers reviewing the MAX6723UTYHD3 datasheet, MAX6723UTYHD3 pinout, MAX6723UTYHD3 application, or MAX6723UTYHD3 equivalent, key selection criteria include dual-supply threshold accuracy, guaranteed reset validity down to VCC = 0.8V, low 14µA supply current, immunity to sub-20µs VCC transients, and compatibility with battery-backed systems requiring long watchdog startup.

Technical Context

The MAX6723UTYHD3 integrates two independent voltage comparators monitoring VCC1 (primary) and VCC2 (secondary) against factory-set thresholds - 3.075V (±1.5%) and 1.665V (±1.5%) respectively - with 0.5% hysteresis. Its RSTIN input uses an internal 626mV reference to support externally adjustable third-voltage supervision via resistor divider.

It implements a dual-mode watchdog: a 35s minimum startup period after any reset event, followed by a 1.12s minimum normal timeout triggered by missing WDI edges. Reset assertion is latched for 210ms minimum after all monitored voltages recover, with MR input providing synchronous manual reset capability and internal 50kΩ pullup to VCC1.

Key Specifications

Pinout & Package

MAX6723UTYHD3 is housed in a 6-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), surface-mount, RoHS-compliant, with thermal pad option not included.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and ADM6705ARJZ-REEL7, MAX6723UTYHD3 uniquely delivers factory-trimmed dual-threshold supervision, RSTIN-based third-voltage monitoring, and dual-mode watchdog - essential for systems requiring coordinated multi-rail power sequencing and robust firmware health checking.

Availability

MAX6723UTYHD3 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, automotive ADAS modules, and medical infusion pumps requiring stable component supply across extended temperature and long product lifecycles.

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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications in demanding environments.

The MAX6715A–MAX6729A family delivers ultra-low-voltage, multi-rail supervisory circuits optimized for space-constrained, thermally aggressive systems requiring guaranteed reset behavior down to 0.8V and flexible fault-detection modes.

FAQ

What are the exact reset threshold voltages for MAX6723UTYHD3?

The MAX6723UTYHD3 has factory-trimmed reset thresholds of 3.075V (VTH1, ±1.5%) for VCC1 and 1.665V (VTH2, ±1.5%) for VCC2, per the "T" and "W" suffix codes in Maxim's Reset Voltage Threshold Suffix Guide. These values are measured at +25°C and include 0.5% hysteresis. The RSTIN input uses a fixed 626mV internal reference for third-voltage monitoring.

Does MAX6723UTYHD3 support watchdog functionality, and what are its timing modes?

Yes, MAX6723UTYHD3 includes a dual-mode watchdog timer. After any reset event, it enters a 35s minimum startup mode to accommodate lengthy boot sequences. Once the first valid WDI edge occurs, it switches to a 1.12s minimum normal timeout mode. The watchdog is disabled if WDI is left floating, as the device detects the unconnected state via a 200nA current source.

What is the reset output type and drive capability of MAX6723UTYHD3?

MAX6723UTYHD3 provides an active-low, open-drain RST output (Pin 1) requiring an external pullup resistor. It guarantees VOL ≤ 0.4V at ISINK = 3.2mA when VCC1 ≥ 4.5V, and leakage current ≤ 0.5µA when deasserted. This configuration avoids contention with bidirectional µP reset pins and supports wired-OR reset bus architectures.

How does MAX6723UTYHD3 ensure valid reset operation during severe brownout conditions?

MAX6723UTYHD3 guarantees correct reset output logic state as long as either VCC1 or VCC2 remains above 0.8V - verified across -40°C to +125°C. This ensures deterministic behavior during deep undervoltage events, protecting nonvolatile memory writes and preventing metastability in downstream logic. No external pulldown is needed for push-pull variants, but MAX6723UTYHD3's open-drain RST requires proper pullup sizing.

Can MAX6723UTYHD3 monitor a third voltage, and how is it configured?

Yes, MAX6723UTYHD3 supports third-voltage monitoring via the RSTIN pin (Pin 6), which compares the applied voltage against an internal 626mV reference. To supervise a custom voltage (e.g., 1.2V), connect a resistor divider between the target rail and ground, with the midpoint fed to RSTIN. Equation: V_{EXT_TH} = 626mV × (R1 + R2)/R2. Low input bias (<100nA) enables high-value resistors to minimize power draw.