Analog Devices Inc./Maxim Integrated MAX6722UTVHD3+T

Overview

MAX6722UTVHD3+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (4.625V threshold) and VCC2 (3.075V threshold) with 210ms minimum reset timeout, watchdog timer (1.12s normal / 35s startup), manual reset input, and push-pull active-low RST output. It ensures reliable system boot and brownout recovery in multivoltage embedded power rails.

For engineers reviewing the MAX6722UTVHD3+T datasheet, MAX6722UTVHD3+T pinout, MAX6722UTVHD3+T application, or MAX6722UTVHD3+T equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over -40°C to +85°C), guaranteed reset validity down to VCC1/VCC2 = 0.8V, low 14µA typical supply current at 3.6V, and integrated watchdog with long startup period for complex firmware initialization.

Technical Context

The MAX6722UTVHD3+T implements independent voltage comparators for VCC1 and VCC2 with factory-trimmed thresholds (4.625V and 3.075V), a 210ms min reset timeout timer, and a dual-mode watchdog with 35s initial and 1.12s normal timeout periods. Its push-pull RST output is referenced to VCC1 and drives low during fault conditions.

It features an internal 50kΩ pullup on MR, supports manual reset assertion with <1µs pulse width immunity, and guarantees correct reset logic state when either VCC1 or VCC2 remains ≥0.8V - enabling robust operation during deep brownouts without external biasing.

Key Specifications

Pinout & Package

MAX6722UTVHD3+T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant and lead-free (+T suffix). Pin 1 is marked with dot; device orientation follows JEDEC MO-178.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6722UTVHD3+T, MAX6721UTVHD3+T offers identical supervision accuracy and timing but requires external biasing for reset assertion, while TPS3808G33DBVR reduces feature set and cost but sacrifices dual-rail coverage and system-level fault detection capability.

Availability

MAX6722UTVHD3+T is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC I/O modules, medical diagnostic imaging, and network edge router designs requiring stable component supply, guaranteed long-term availability, and automotive-grade reliability validation.

Supply support for MAX6722UTVHD3+T 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 precision analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.

The MAX6715–MAX6729 family was designed specifically for ultra-low-voltage, multirail microprocessor supervision in space-constrained embedded systems - emphasizing accuracy, low power, and robustness under brownout conditions.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6722UTVHD3+T?

The MAX6722UTVHD3+T has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, with ±1.5% tolerance over the full -40°C to +85°C operating range. These values are encoded in the "VH" suffix per Maxim's Reset Voltage Threshold Suffix Guide and are verified in the Electrical Characteristics table of the official datasheet. The MAX6722UTVHD3+T uses these precise thresholds to supervise standard 5V and 3.3V rails without external resistor networks.

Does the MAX6722UTVHD3+T support manual reset, and what are its timing requirements?

Yes, the MAX6722UTVHD3+T includes an active-low manual reset input (MR) with internal 50kΩ pullup to VCC1. A logic-low pulse as short as 1µs on MR forces reset assertion, and reset remains active for the full 210ms timeout period after MR returns high. This allows integration with momentary switches or logic controllers without external debouncing. The MAX6722UTVHD3+T guarantees MR response across its entire operating voltage range (0.8V to 5.5V).

How does the watchdog timer function on the MAX6722UTVHD3+T, and what are its two modes?

The MAX6722UTVHD3+T features a dual-mode watchdog timer: a 35s minimum startup mode triggered after each reset event (power-up, MR, or watchdog timeout), followed by a 1.12s minimum normal mode activated by the first valid WDI transition. This architecture prevents false timeouts during boot while enabling rapid hang detection during runtime. The MAX6722UTVHD3+T asserts RST for 210ms upon watchdog expiration, matching its reset timeout period.

What package type and pin count does the MAX6722UTVHD3+T use, and is it RoHS-compliant?

The MAX6722UTVHD3+T is supplied in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm footprint), with lead-free and RoHS-compliant construction indicated by the "+T" suffix. Pin 1 is marked with a dot; the device follows JEDEC MO-178 mechanical standards. This compact package enables high-density PCB layouts in space-constrained applications such as portable medical devices and modular telecom hardware.

Can the MAX6722UTVHD3+T operate reliably during deep brownout conditions?

Yes - the MAX6722UTVHD3+T guarantees correct reset output logic state as long as either VCC1 or VCC2 remains ≥0.8V, eliminating the need for external pull-down resistors or auxiliary biasing. Its internal comparators and reset timer remain functional down to this voltage, ensuring deterministic behavior during gradual supply collapse. This capability is explicitly validated in the Absolute Maximum Ratings and Electrical Characteristics sections of the MAX6722UTVHD3+T datasheet.