Analog Devices Inc./Maxim Integrated MAX6723UTSYD3+

Overview

MAX6723UTSYD3+ 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 monitored supply drops below threshold or manual reset is triggered, and features watchdog timer with 35s startup/1.12s normal timeout. Used in telecom power management and multivoltage embedded systems.

For engineers reviewing the MAX6723UTSYD3+ datasheet, MAX6723UTSYD3+ pinout, MAX6723UTSYD3+ application, or MAX6723UTSYD3+ equivalent, key selection criteria include dual-supply monitoring with factory-trimmed thresholds, RSTIN-based third-voltage supervision down to 0.62V, guaranteed reset validity at VCC1/VCC2 ≥ 0.8V, and 14µA typical supply current at 3.6V - critical for battery-operated and low-power industrial designs.

Technical Context

The MAX6723UTSYD3+ implements independent voltage comparators for VCC1 and VCC2 with ±1.5% threshold accuracy and 20ppm/°C tempco, plus a high-impedance RSTIN comparator referenced to a 626.5mV internal bandgap. Reset assertion is latched and held for a minimum 210ms timeout period determined by internal RC timing.

It includes a dual-mode watchdog timer: 35s minimum initial timeout after power-up/manual reset, transitioning to 1.12s normal mode upon first WDI edge detection. The device guarantees correct reset logic state when either VCC1 or VCC2 remains ≥0.8V, enabling robust brownout detection in deep-sleep systems.

Key Specifications

Pinout & Package

MAX6723UTSYD3+ uses a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm) with gull-wing leads, RoHS-compliant lead-free finish (+T suffix), and thermal pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX6723UTSYD3+, MAX6724UTSYD3+ offers simplified board layout at the cost of reduced µP interface flexibility, while TPS3808G33DBVR trades monitoring depth for ultra-low power - making MAX6723UTSYD3+ optimal for triple-rail systems requiring both precision and design adaptability.

Availability

MAX6723UTSYD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and battery-powered edge gateways requiring stable component supply across extended product lifecycles.

Supply support for MAX6723UTSYD3+ 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 multivoltage embedded systems needing compact, low-power, triple-rail supervision with factory-trimmed accuracy and guaranteed low-VCC reset validity.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6723UTSYD3+?

The MAX6723UTSYD3+ has a factory-trimmed VCC1 reset threshold of 4.625V, with a maximum deviation of ±1.5% over temperature and process variation. This value is encoded in the 'SY' suffix per Maxim's Reset Voltage Threshold Suffix Guide and is verified across -40°C to +85°C. The MAX6723UTSYD3+ uses this precise threshold to detect collapse of standard 5V power rails before downstream logic errors occur.

Does the MAX6723UTSYD3+ support monitoring a third voltage, and how is it configured?

Yes, the MAX6723UTSYD3+ supports third-voltage monitoring via its RSTIN pin, which compares the applied voltage against a 626.5mV internal reference. To configure, connect an external resistor divider from the target supply to GND, with the midpoint fed to RSTIN. The threshold is calculated as V_EXT = 626.5mV × (R1 + R2)/R2. The MAX6723UTSYD3+ guarantees ±25nA input leakage, enabling high-resistance dividers that minimize standby current drain.

What is the function of the MR pin on the MAX6723UTSYD3+, and what are its electrical requirements?

The MR pin on the MAX6723UTSYD3+ is an active-low manual reset input with an internal 50kΩ pullup to VCC1. Driving MR low forces an immediate reset assertion for the full 210ms timeout period, regardless of supply conditions. It accepts TTL/CMOS logic levels, requires a minimum 1µs pulse width, and rejects glitches shorter than 100ns. The MAX6723UTSYD3+ specifies V_IL ≤ 0.3×VCC1 and V_IH ≥ 0.7×VCC1, ensuring compatibility across varying supply voltages.

How does the watchdog timer operate on the MAX6723UTSYD3+, and is it enabled by default?

The MAX6723UTSYD3+ watchdog timer operates in dual-mode: a 35s minimum initial timeout after power-up or reset, followed by a 1.12s normal timeout after the first valid WDI transition. It is enabled by default and requires no configuration. The MAX6723UTSYD3+ clears the timer on any rising or falling edge at WDI; failure to toggle within the timeout period asserts reset. No external components or register writes are needed - the watchdog is fully hardware-managed.

What package type and pin count does the MAX6723UTSYD3+ use, and is it RoHS-compliant?

The MAX6723UTSYD3+ uses a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm body size) with gull-wing leads and exposed thermal pad not connected internally. It is RoHS-compliant and supplied in lead-free format, indicated by the '+' suffix in the part number. The MAX6723UTSYD3+ meets JEDEC J-STD-020 moisture sensitivity level 1 and is qualified for reflow soldering per IPC/JEDEC J-STD-020.