Analog Devices Inc./Maxim Integrated MAX6723UTZGD3+

Overview

MAX6723UTZGD3+ 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 RSTIN (626.5mV reference) with 210ms minimum reset timeout. It features open-drain active-low RST output, manual reset input (MR), and watchdog timer with 35s startup/1.12s normal mode. Used in multivoltage telecom and industrial systems to ensure reliable power-up sequencing and brownout protection.

For engineers reviewing the MAX6723UTZGD3+ datasheet, MAX6723UTZGD3+ pinout, MAX6723UTZGD3+ application, or MAX6723UTZGD3+ equivalent, key selection criteria include dual-supply monitoring range (1.8–5.0V / 0.9–3.3V), guaranteed reset validity down to VCC = 0.8V, low 14µA typical supply current at 3.6V, and compatibility with noisy environments via 20µs VCC-to-reset delay and immunity to short transients.

Technical Context

The MAX6723UTZGD3+ integrates three independent voltage monitors: primary (VCC1), secondary (VCC2), and adjustable auxiliary (RSTIN) with internal 626.5mV reference. Reset assertion occurs when any monitored voltage falls below its factory-trimmed threshold, and reset remains asserted for ≥210ms after all voltages recover.

It implements a dual-mode watchdog timer-35s minimum initial timeout after reset events (e.g., power-up or MR activation), followed by 1.12s minimum normal timeout triggered by WDI transitions. The open-drain RST output requires external pullup and is referenced to VCC1, while MR includes internal 50kΩ pullup to VCC1 and supports TTL/CMOS logic levels.

Key Specifications

Pinout & Package

MAX6723UTZGD3+ uses a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6723UTZGD3+, MAX6724UTZGD3+ offers push-pull drive for simpler interfacing but loses wired-OR flexibility, while TPS3808G33DBVR reduces power consumption by 90% but sacrifices triple-monitoring capability and design adaptability for custom voltage thresholds.

Availability

MAX6723UTZGD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6723UTZGD3+ 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, sensing, and interface applications, with emphasis on reliability and integration for harsh environments.

The MAX6715–MAX6729 family delivers ultra-low-voltage, multi-rail supervision in minimal SOT23 footprints-targeting space-constrained, multivoltage systems where board area and power efficiency are critical.

FAQ

What is the exact reset threshold voltage for VCC1 on MAX6723UTZGD3+?

The MAX6723UTZGD3+ has a factory-trimmed VCC1 reset threshold of 4.625V, with a tolerance of ±125mV (min 4.500V, typ 4.625V, max 4.750V). This value is encoded in the "ZG" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies specifically to the MAX6723UTZGD3+ variant-not the broader MAX6723 family.

Does MAX6723UTZGD3+ support monitoring a negative supply voltage?

Yes, MAX6723UTZGD3+ can monitor negative supplies using the RSTIN pin with an external resistor-divider network configured per Figure 1 in the datasheet. The internal 626.5mV reference enables accurate trip-point setting regardless of polarity, provided the divider biases RSTIN within 0V to VCC1.

What is the function of the MR pin on MAX6723UTZGD3+ and how should it be used?

The MR pin on MAX6723UTZGD3+ is an active-low manual reset input with internal 50kΩ pullup to VCC1. Pulling MR low forces reset assertion for the full 210ms timeout period-even if VCC1/VCC2 remain stable. It supports direct connection to momentary switches (GND to MR) without external debounce components.

Can MAX6723UTZGD3+ generate a power-fail interrupt signal?

No, MAX6723UTZGD3+ does not include PFI/PFO functionality. That feature is reserved for MAX6728/MAX6729 variants. The MAX6723UTZGD3+ provides RSTIN for third-voltage monitoring but lacks dedicated power-fail comparator inputs or outputs.

Is the watchdog timer on MAX6723UTZGD3+ enabled by default after power-up?

Yes, the watchdog timer on MAX6723UTZGD3+ is active by default after power-up or any reset event. It begins in long-startup mode (≥35s timeout), then transitions to normal mode (≥1.12s timeout) upon first valid WDI edge-no configuration register or external enable signal is required.