Analog Devices Inc./Maxim Integrated MAX6723UTTGD3

Overview

MAX6723UTTGD3 from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (primary supply) and VCC2 (secondary supply) with factory-trimmed thresholds of 3.075V (VTH1) and 2.925V (VTH2), 210ms reset timeout, and integrated RSTIN input for adjustable third-voltage monitoring down to 0.626V. It asserts active-low open-drain RST output when either supply drops below threshold and maintains reset for ≥210ms after recovery - used in telecom power management and industrial embedded controllers requiring reliable brownout detection.

For engineers reviewing the MAX6723UTTGD3 datasheet, MAX6723UTTGD3 pinout, MAX6723UTTGD3 application, or MAX6723UTTGD3 equivalent, key selection criteria include its dual-supply monitoring capability with 0.8V minimum valid operation, 14µA typical supply current at 3.6V, RSTIN-adjustable third-voltage support, and guaranteed reset assertion during VCC transients as short as 20µs.

Technical Context

The MAX6723UTTGD3 implements dual independent voltage comparators with hysteresis (0.5% of VTH), internal 626mV reference for RSTIN, and a digital timeout counter triggered on any fault condition (VCC1/VCC2 undervoltage, MR low, or RSTIN drop). Its reset logic guarantees correct state down to VCC1 or VCC2 = 0.8V, enabling operation during deep brownouts.

It features an open-drain RST output referenced to VCC1, internal 50kΩ MR pullup, and supports external resistor-divider networks on RSTIN for precise third-voltage threshold setting (e.g., VEXT_TH = 626mV × (R1 + R2)/R2). No watchdog or PFI/PFO functions are enabled in this variant.

Key Specifications

Pinout & Package

Package: 6-pin SOT23, surface-mount, RoHS-compliant, 1.6mm × 2.9mm footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6723UTTGD3, MAX6724UTTGD3 offers push-pull drive for simplified layout but sacrifices open-drain flexibility, while TPS3808G33DBVR reduces power consumption by 82% but eliminates dual-supply and RSTIN functionality entirely - making MAX6723UTTGD3 the optimal choice for multi-rail systems requiring third-voltage adaptability.

Availability

MAX6723UTTGD3 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6723UTTGD3 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, mixed-signal, and power management ICs for high-reliability industrial, automotive, and communications applications.

The MAX6715A–MAX6729A family delivers ultra-low-voltage supervisory circuits targeting space-constrained, multi-rail embedded systems where guaranteed reset validity down to 0.8V and flexible voltage monitoring are critical.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6723UTTGD3?

The MAX6723UTTGD3 has a factory-trimmed VCC1 reset threshold of 3.075V (typical, falling edge), with tolerance of ±37.5mV over temperature and supply variations. This value is fixed by the 'T' suffix in the part number and applies to the primary 3.3V supply monitoring function of the MAX6723UTTGD3.

Does the MAX6723UTTGD3 support watchdog timer functionality?

No, the MAX6723UTTGD3 does not include watchdog timer functionality. The 'W' suffix denotes watchdog-enabled variants (e.g., MAX6727A), whereas MAX6723UTTGD3 is a dual-supply supervisor with RSTIN input only - confirmed by its absence in the WDI pin assignment and selector guide for this specific suffix combination.

Can the MAX6723UTTGD3 monitor three independent supply voltages simultaneously?

Yes, the MAX6723UTTGD3 monitors two fixed supplies (VCC1 and VCC2) and supports a third adjustable voltage via the RSTIN pin, which uses an internal 626mV reference. By connecting an external resistor divider to RSTIN, users can precisely set a third threshold - for example, monitoring a 1.2V core supply - making the MAX6723UTTGD3 a true triple-voltage supervisor in practice.

What is the function of Pin 6 (RSTIN) on the MAX6723UTTGD3?

Pin 6 (RSTIN) on the MAX6723UTTGD3 is a high-impedance input referenced to an internal 626mV bandgap voltage. When the voltage at RSTIN falls below this threshold, the device asserts RST. It enables monitoring of auxiliary supplies (e.g., 1.2V, 1.8V) using an external resistor divider, extending the MAX6723UTTGD3's capability beyond its two dedicated supply inputs.

Is the MAX6723UTTGD3 compatible with 1.8V logic systems?

Yes, the MAX6723UTTGD3 operates with VCC2 as low as 0.9V and guarantees valid reset output down to VCC1 or VCC2 = 0.8V. Its MR input accepts logic levels referenced to VCC1 (VIH = 0.7×VCC1, VIL = 0.3×VCC1), and RST output is open-drain - allowing direct interface with 1.8V µPs using appropriate pullup voltage, confirming full compatibility with 1.8V logic systems.