Analog Devices Inc./Maxim Integrated MAX6720AUTYHD3+T

Overview

MAX6720AUTYHD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (4.625V threshold), VCC2 (3.075V threshold), and an externally adjustable RSTIN input (626.5mV reference). It asserts active-low push-pull reset for ≥210ms after any monitored supply drops below threshold or manual reset is triggered, and supports watchdog timeout with 35s startup/1.12s normal mode. It is used in multivoltage embedded systems requiring reliable power sequencing and brownout protection.

For engineers reviewing the MAX6720AUTYHD3+T datasheet, MAX6720AUTYHD3+T pinout, MAX6720AUTYHD3+T application, or MAX6720AUTYHD3+T equivalent, this page delivers verified specifications, exact pin functions, dual-supply reset timing behavior, watchdog startup sequence details, and confirmed alternative parts for voltage supervisor selection in telecom, industrial, and portable equipment.

Technical Context

The MAX6720AUTYHD3+T implements a dual-threshold comparator architecture: one for primary supply (VCC1 = 4.625V ±125mV) and one for secondary supply (VCC2 = 3.075V ±75mV), both factory-trimmed with 20ppm/°C tempco. Its third monitoring path uses an internal 626.5mV reference to sense auxiliary voltages via RSTIN with ≤25nA input current and 3mV hysteresis.

It integrates a dual-mode watchdog timer-35s minimum initial timeout after reset, then 1.12s minimum normal timeout after first WDI edge-and features push-pull RST output referenced to VCC1, guaranteed valid down to VCC1 or VCC2 = 0.8V, with 14µA typical supply current at 3.6V.

Key Specifications

Pinout & Package

MAX6720AUTYHD3+T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), lead-free, RoHS-compliant, with gull-wing leads and thermal pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with MAX6720AUTYHD3+T, the MAX6720AUTYHD5+T offers doubled reset timeout for robustness in slow-start systems, while the TPS3808G33DBVR trades RSTIN flexibility for lower quiescent current-neither is pin-compatible nor functionally identical, but both serve distinct supervisory niches.

Availability

MAX6720AUTYHD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control, and portable medical equipment requiring stable component supply, long-lifecycle support, and guaranteed lead-free compliance.

Supply support for MAX6720AUTYHD3+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 interface applications, with emphasis on high-reliability industrial and communications solutions.

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

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6720AUTYHD3+T?

The MAX6720AUTYHD3+T has a factory-trimmed VCC1 reset threshold of 4.625V (minimum 4.500V, maximum 4.750V) with ±0.5% accuracy over temperature. This value is encoded in the "TY" suffix per Maxim's Reset Voltage Threshold Suffix Guide and is validated across the full -40°C to +85°C operating range. The MAX6720AUTYHD3+T uses this precise threshold to supervise 5V rails without external calibration.

Does the MAX6720AUTYHD3+T support monitoring a third voltage, and how is it configured?

Yes, the MAX6720AUTYHD3+T supports third-voltage monitoring via its RSTIN pin, which compares the applied voltage against an internal 626.5mV 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_TH} = 626.5mV × (R1 + R2)/R2. The MAX6720AUTYHD3+T guarantees ≤25nA RSTIN input current, enabling high-resistance dividers for minimal power loss.

What is the reset timeout period of the MAX6720AUTYHD3+T, and is it adjustable?

The MAX6720AUTYHD3+T has a fixed minimum reset timeout period of 210ms, indicated by the "D3" suffix in its part number. This value is factory-set and not user-adjustable. The timeout begins when reset is asserted and ensures the µP remains held in reset long enough for complete power stabilization and firmware initialization. The MAX6720AUTYHD3+T does not support external capacitor-based timeout adjustment.

Is the reset output of the MAX6720AUTYHD3+T open-drain or push-pull?

The MAX6720AUTYHD3+T features a push-pull active-low reset output (RST pin), as confirmed by its "U" prefix in the ordering code and electrical specs showing VOH = 0.8×VCC1 and VOL ≤ 0.4V at 3.2mA sink. This eliminates the need for an external pullup resistor and provides stronger drive capability than open-drain alternatives. The MAX6720AUTYHD3+T RST output is referenced to VCC1 and operates reliably down to VCC1 = 0.8V.

What watchdog timeout modes does the MAX6720AUTYHD3+T support, and how do they differ?

The MAX6720AUTYHD3+T implements a dual-mode watchdog: a 35s minimum startup timeout after any reset event (power-up, MR, or watchdog-triggered), followed by a 1.12s minimum normal timeout after the first valid WDI transition. This architecture prevents false resets during boot while enabling rapid fault detection during operation. The MAX6720AUTYHD3+T watchdog clears on any WDI edge and requires no external components to configure these modes.