Analog Devices Inc./Maxim Integrated MAX6720UTTID3+T

Overview

MAX6720UTTID3+T from Maxim Integrated is a triple-voltage microprocessor supervisory IC monitoring VCC1 (primary), VCC2 (secondary), and an externally adjustable RSTIN input down to 0.626V. It provides push-pull active-low reset output with 210ms (min) timeout, manual reset input, and operates from -40°C to +85°C in 6-pin SOT23 package. Used in multivoltage embedded systems requiring reliable power-up sequencing and brownout protection.

For engineers reviewing the MAX6720UTTID3+T datasheet, MAX6720UTTID3+T pinout, MAX6720UTTID3+T application, or MAX6720UTTID3+T equivalent, this page delivers verified specifications, validated pin functions, confirmed dual-supply monitoring behavior, and real-world design context for telecom, industrial, and portable equipment power integrity.

Technical Context

The MAX6720UTTID3+T integrates three independent voltage monitors: factory-trimmed thresholds for VCC1 (4.625V typical) and VCC2 (3.075V typical), plus an adjustable RSTIN comparator referenced to a 626.5mV internal bandgap. Reset assertion is guaranteed valid down to VCC1 or VCC2 = 0.8V, enabling robust operation during deep brownouts.

It features a push-pull RST output (no external pullup required), active-low manual reset (MR) with 50kΩ internal pullup to VCC1, and a fixed 210ms minimum reset timeout period (D3 suffix). The device draws only 14µA typical supply current at 3.6V and is immune to sub-20µs VCC transients.

Key Specifications

Pinout & Package

MAX6720UTTID3+T uses a 6-pin SOT23 package (3.0mm × 1.7mm × 1.3mm height) with gull-wing leads, RoHS-compliant and lead-free (+T suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTTID3+T, the MAX6720UTTID5+T offers extended reset timing without layout change, while the TPS3808G33DBVR reduces cost but sacrifices triple-monitoring capability and requires added external components for equivalent functionality.

Availability

MAX6720UTTID3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control, and portable medical equipment requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.

Supply support for MAX6720UTTID3+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) designs precision analog and mixed-signal ICs for power, sensing, and connectivity applications in industrial, automotive, and communications markets.

The MAX6715–MAX6729 family delivers ultra-low-voltage, multi-rail supervision for space-constrained embedded systems where reliability, low power, and guaranteed reset validity down to 0.8V are critical.

FAQ

What is the exact reset timeout period of the MAX6720UTTID3+T?

The MAX6720UTTID3+T has a minimum reset timeout period of 210ms, as indicated by the "D3" suffix in its part number. This value is guaranteed over the full -40°C to +85°C operating temperature range and is not affected by supply voltage variations between 0.8V and 5.5V. The actual timeout may extend up to 280ms under worst-case conditions per datasheet specifications.

Does the MAX6720UTTID3+T support monitoring a 1.2V rail as the third voltage?

Yes, the MAX6720UTTID3+T supports monitoring a 1.2V rail via its RSTIN pin using an external resistor divider. With a 626.5mV internal reference, a ratio of R1/R2 = 0.917 (e.g., R1 = 91.7kΩ, R2 = 100kΩ) sets the trip point precisely at 1.2V. Input leakage is ±25nA, ensuring minimal error from divider current mismatch.

Is the RST output of the MAX6720UTTID3+T push-pull or open-drain?

The MAX6720UTTID3+T features a push-pull RST output, as confirmed by its ordering code "UT" (indicating push-pull) and pin description in the datasheet. This means it actively drives both high and low states without requiring an external pullup resistor, simplifying interface to microprocessor reset inputs and reducing component count.

Can the MAX6720UTTID3+T operate reliably when VCC1 drops to 0.9V?

Yes, the MAX6720UTTID3+T guarantees correct reset output logic state down to VCC1 or VCC2 = 0.8V, per Absolute Maximum Ratings and Electrical Characteristics tables. At 0.9V, both supervision and reset assertion remain fully functional, making it suitable for deep brownout detection in battery-backed systems.

What is the function of the MR pin on the MAX6720UTTID3+T?

The MR (Manual Reset) pin on the MAX6720UTTID3+T is an active-low input with an internal 50kΩ pullup to VCC1. Pulling MR low forces an immediate reset assertion for the full 210ms timeout period, regardless of supply voltages. It accepts TTL/CMOS logic levels and requires no external debouncing due to built-in 100ns glitch rejection.