Analog Devices Inc./Maxim Integrated MAX6722UTYHD3+

Overview

MAX6722UTYHD3+ from Maxim Integrated is a dual-voltage microprocessor supervisory IC monitoring VCC1 (primary supply) and VCC2 (secondary supply), with manual reset input (MR), watchdog timer (WDI), and push-pull active-low RST output. It asserts reset when either supply drops below factory-trimmed thresholds (VTH1 = 4.625 V, VTH2 = 3.075 V), maintains reset for 210 ms (min), and operates down to VCC = 0.8 V. Used in telecom power management and industrial embedded controllers requiring reliable brownout detection.

For engineers reviewing the MAX6722UTYHD3+ datasheet, MAX6722UTYHD3+ pinout, MAX6722UTYHD3+ application, or MAX6722UTYHD3+ equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temperature), guaranteed reset validity at low VCC (0.8 V), 14 µA typical supply current, and integrated watchdog with 35 s startup / 1.12 s normal timeout - critical for fail-safe boot sequences in battery-backed systems.

Technical Context

The MAX6722UTYHD3+ implements independent voltage comparators for VCC1 and VCC2, each referenced to a precision bandgap-derived internal reference with 20 ppm/°C tempco. Its reset logic combines ORed fault conditions (VCC1/VCC2 undervoltage, MR assertion, WDI timeout) and enforces a fixed 210 ms minimum reset pulse width via an on-chip timeout counter.

It features a dual-mode watchdog: a 35 s (min) initial timeout after any reset event enables safe system initialization, followed by a 1.12 s (min) normal timeout requiring periodic WDI edge transitions. The push-pull RST output is referenced to VCC1 and sinks up to 3.2 mA at 4.5 V, ensuring robust drive into microprocessor reset pins without external pull-up.

Key Specifications

Pinout & Package

MAX6722UTYHD3+ is housed in a 6-pin SOT23-6 package (2.9 mm × 1.6 mm × 1.1 mm), RoHS-compliant and lead-free (+T suffix). Pin 1 is marked with a dot; device orientation follows JEDEC MO-178 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6722UTYHD3+, MAX6326UR29D3+ reduces feature set to cut cost but sacrifices dual-supply coordination and watchdog safety; TPS3808G33DBVR improves quiescent current but removes critical MR and VCC2 capability - neither offers drop-in replacement for systems relying on MAX6722UTYHD3+'s full dual-rail + WDI + MR feature set.

Availability

MAX6722UTYHD3+ 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 reset timing under brownout conditions.

Supply support for MAX6722UTYHD3+ 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 demanding industrial, automotive, and communications applications.

The MAX6715–MAX6729 family was designed to replace discrete reset solutions in space-constrained multivoltage systems, delivering guaranteed reset behavior, low IQ, and integrated watchdog functionality in sub-3 mm SOT23 packages.

FAQ

What are the exact reset threshold voltages for MAX6722UTYHD3+?

The MAX6722UTYHD3+ has factory-trimmed reset thresholds of 4.625 V (VTH1, VCC1) and 3.075 V (VTH2, VCC2), with ±1.5% tolerance over -40°C to +85°C. These values are encoded in the "YH" suffix per Maxim's Reset Voltage Threshold Suffix Guide and are confirmed in the Electrical Characteristics table of the official datasheet. The MAX6722UTYHD3+ does not support adjustable thresholds - RSTIN and PFI pins are not implemented in this variant.

Does MAX6722UTYHD3+ support watchdog functionality, and what are its timing modes?

Yes, MAX6722UTYHD3+ includes a dual-mode watchdog timer. After any reset event (power-up, MR, or timeout), it enters a 35 s (min) startup mode to allow full system initialization. Once the first valid WDI edge occurs, it switches to 1.12 s (min) normal mode. This architecture prevents false resets during boot while ensuring rapid fault detection during runtime - a key differentiator from single-mode watchdog supervisors.

What is the reset timeout period of MAX6722UTYHD3+, and how is it set?

The MAX6722UTYHD3+ has a fixed reset timeout period of 210 ms (minimum), indicated by the "D3" suffix in its part number per Maxim's Reset Timeout Period Suffix Guide. This value is implemented with an internal RC oscillator and counter, requiring no external components. The timeout begins when all monitored supplies exceed their thresholds and ends after exactly 210 ms, ensuring predictable reset hold time across temperature and voltage.

Can MAX6722UTYHD3+ monitor three supply voltages?

No, MAX6722UTYHD3+ is a dual-voltage supervisor monitoring only VCC1 and VCC2. The "22" in its part number identifies it as a MAX6722 variant, which lacks RSTIN and PFI inputs - those are present only in MAX6723–MAX6729 devices. For triple-voltage monitoring, consider MAX6723UTYHD3+ (with RSTIN) or MAX6728UTYHD3+ (with RSTIN and PFI), both sharing identical threshold and timeout specifications.

What package type and pin count does MAX6722UTYHD3+ use?

MAX6722UTYHD3+ uses a 6-pin SOT23-6 package (JEDEC MO-178), measuring 2.9 mm × 1.6 mm × 1.1 mm. Pin 1 is marked with a dot; the pinout is GND (2), MR (3), VCC2 (4), WDI (5), VCC1 (6), and RST (1). This compact footprint supports high-density PCB layouts in space-constrained applications like 1U servers and portable diagnostic equipment.