Analog Devices Inc./Maxim Integrated MAX6720AUTYDD3+T

Overview

MAX6720AUTYDD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory IC monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (auxiliary) supply rails. It asserts an active-low push-pull reset output when any monitored voltage falls below its factory-trimmed threshold, maintains reset for 210ms (min), and guarantees valid reset operation down to VCC1 or VCC2 = 0.8V. Used in multivoltage telecom and industrial systems requiring reliable power-on reset and brownout detection.

For engineers reviewing the MAX6720AUTYDD3+T datasheet, MAX6720AUTYDD3+T pinout, MAX6720AUTYDD3+T application, or MAX6720AUTYDD3+T equivalent, key selection criteria include dual/third-supply monitoring capability, 210ms reset timeout, push-pull RST output, adjustable RSTIN threshold (626.5mV), and guaranteed reset validity at ultra-low VCC (0.8V).

Technical Context

The MAX6720AUTYDD3+T integrates three independent voltage comparators: one for VCC1 (1.8V–5.0V range), one for VCC2 (0.9V–3.3V), and one for RSTIN with internal 626.5mV reference enabling monitoring of voltages as low as 0.62V via external resistor divider. Its reset logic combines ORed fault conditions - VCC1/VCC2 undervoltage, RSTIN undervoltage, or manual reset assertion - with a monolithic timeout timer.

This device implements a push-pull active-low RST output referenced to VCC1, supports manual reset input (MR) with internal 50kΩ pullup, and features no watchdog or power-fail circuitry - confirmed by Selector Guide and Pin Description tables. All functions operate across –40°C to +85°C in 6-pin SOT23-6 package.

Key Specifications

Pinout & Package

MAX6720AUTYDD3+T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant and lead-free (+T suffix). The compact footprint supports high-density PCB layouts in space-constrained applications such as portable networking gear and embedded controllers.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720AUTYDD3+T, the MAX6720AUTYDD5+T offers extended reset duration without changing interface or accuracy, while the TPS3808G33DBVR reduces feature set and cost but sacrifices triple-monitoring capability and threshold flexibility.

Availability

MAX6720AUTYDD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and battery-powered IoT gateways requiring stable component supply, long-term lifecycle support, and guaranteed reset behavior under brownout conditions.

Supply support for MAX6720AUTYDD3+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, with emphasis on reliability and integration.

The MAX6715–MAX6729 family delivers compact, ultra-low-power supervisory solutions for multivoltage embedded systems - specifically engineered to replace discrete reset circuits while guaranteeing operation down to 0.8V VCC.

FAQ

What is the exact reset timeout period of MAX6720AUTYDD3+T?

The MAX6720AUTYDD3+T has a minimum reset timeout period of 210ms, as defined by the "D3" suffix in its part number per the Reset Timeout Period Suffix Guide. This is the guaranteed minimum duration for which the active-low RST output remains asserted after all monitored supplies exceed their thresholds. Typical value is 210ms, with maximum 280ms across temperature and voltage ranges.

Does MAX6720AUTYDD3+T support watchdog functionality?

No, MAX6720AUTYDD3+T does not include watchdog functionality. According to the Selector Guide and Pin Description, it belongs to the MAX6719/MAX6720 subgroup, which provides triple-voltage monitoring and manual reset but omits WDI (watchdog input) and associated timer circuitry. Watchdog capability begins with MAX6721 and higher variants.

What are the factory-trimmed voltage thresholds for MAX6720AUTYDD3+T?

The MAX6720AUTYDD3+T has factory-trimmed thresholds of 4.625V (typ) for VCC1 and 3.075V (typ) for VCC2, corresponding to the "YT" suffix per the Reset Voltage Threshold Suffix Guide. These values are guaranteed over –40°C to +85°C with ±1.5% tolerance and 20ppm/°C tempco, eliminating need for external calibration.

Can MAX6720AUTYDD3+T monitor a 1.2V core supply?

Yes, MAX6720AUTYDD3+T can monitor a 1.2V core supply using its RSTIN pin. With an internal 626.5mV reference, a simple resistor divider (e.g., R1 = 110kΩ, R2 = 120kΩ) scales 1.2V down to ~652mV - safely above threshold. The 25nA max input current ensures minimal loading, preserving accuracy and battery life.

Is MAX6720AUTYDD3+T pin-compatible with other MAX67xx devices in SOT23-6?

MAX6720AUTYDD3+T shares the same 6-pin SOT23-6 pinout as all MAX6715–MAX6722 variants in that package, including identical RST, GND, MR, VCC2, VCC1, and RSTIN assignments. However, functional compatibility depends on feature set - e.g., MAX6715 lacks RSTIN, and MAX6721 adds WDI - so electrical interface remains consistent but supervision capability differs.