Analog Devices Inc./Maxim Integrated MAX6720UTVHD3+T

Overview

MAX6720UTVHD3+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 asserts an active-low push-pull reset output for ≥210ms after any monitored supply falls below its factory-trimmed threshold, with guaranteed reset validity down to VCC1 or VCC2 = 0.8V. Used in multivoltage embedded systems requiring reliable power-up sequencing and brownout protection.

For engineers reviewing the MAX6720UTVHD3+T datasheet, MAX6720UTVHD3+T pinout, MAX6720UTVHD3+T application, or MAX6720UTVHD3+T equivalent, key selection criteria include dual-supply monitoring with third-voltage adjustability, 210ms reset timeout, push-pull RST output referenced to VCC1, and operation over –40°C to +85°C in SOT23-6 package.

Technical Context

The MAX6720UTVHD3+T implements independent voltage comparators for VCC1 (1.8V–5.0V range) and VCC2 (0.9V–3.3V range), plus a high-impedance RSTIN input with 626mV internal reference for monitoring auxiliary supplies as low as 0.62V. Its reset logic combines OR-ed fault detection across all three inputs and enforces a minimum 210ms (typ) timeout period after recovery.

This device integrates a manual reset input (MR) with 50kΩ internal pullup to VCC1 and supports push-pull RST output referenced to VCC1. It lacks watchdog timer and power-fail I/O features-confirmed by Selector Guide and Pin Description tables-making it a dedicated triple-supply monitor without timing supervision or PFI/PFO functionality.

Key Specifications

Pinout & Package

MAX6720UTVHD3+T is housed in a 6-pin SOT23-6 package with gull-wing leads, JEDEC MO-178AC compliant, 1.45mm max height, and thermal pad omitted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTVHD5+T and TPS3808G33DBVR, the MAX6720UTVHD3+T uniquely delivers factory-trimmed 4.625V/3.075V dual thresholds plus RSTIN adjustability in a single SOT23-6 package with 210ms timeout-enabling compact, calibrated triple-rail supervision without design compromises.

Availability

MAX6720UTVHD3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, medical patient monitors, and automotive ADAS camera modules requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6720UTVHD3+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, mixed-signal, and power-management ICs for demanding industrial, communications, and computing applications.

The MAX6715–MAX6729 family delivers ultra-low-voltage, multi-rail supervisory circuits optimized for space-constrained embedded systems needing reliable power-up sequencing and brownout immunity across heterogeneous supply domains.

FAQ

What is the exact reset timeout period for MAX6720UTVHD3+T?

The MAX6720UTVHD3+T has a nominal reset timeout period of 210ms, with a minimum guaranteed value of 140ms and maximum of 280ms across temperature and voltage ranges. This timing is factory-set by the 'D3' suffix and applies after any monitored supply recovers above its threshold, MR release, or RSTIN recovery.

Does MAX6720UTVHD3+T include a watchdog timer function?

No, the MAX6720UTVHD3+T does not include a watchdog timer. Per the Selector Guide and Functional Diagram, watchdog input (WDI) is absent in MAX6720 devices. Only MAX6721 through MAX6729 variants integrate watchdog functionality; MAX6720UTVHD3+T is strictly a triple-voltage supervisor with MR and RSTIN inputs.

What are the factory-trimmed voltage thresholds for MAX6720UTVHD3+T?

The MAX6720UTVHD3+T has factory-trimmed thresholds of 4.625V (typ) for VCC1 and 3.075V (typ) for VCC2, corresponding to the 'VH' suffix per the Reset Voltage Threshold Suffix Guide. These values are production-tested and guaranteed across –40°C to +85°C with ±1.5% tolerance.

Can MAX6720UTVHD3+T monitor a 1.2V supply using the RSTIN pin?

Yes, MAX6720UTVHD3+T can monitor a 1.2V supply via RSTIN using a resistor divider. With a 626.5mV internal reference, a divider ratio of R1/R2 = (1.2V / 0.6265V) − 1 ≈ 0.914 achieves trip point at 1.2V. High-impedance RSTIN input (±25nA leakage) enables use of MΩ-range resistors to minimize current draw.

Is MAX6720UTVHD3+T pin-compatible with other MAX67xx SOT23-6 variants?

MAX6720UTVHD3+T shares the same SOT23-6 pinout as MAX6715–MAX6720 series devices per Pin Description table, but functional compatibility depends on feature set. It is pin-compatible with MAX6719UTVHD3+T (same RSTIN capability) but not with MAX6715/MAX6716 (dual-supply only) or MAX6728/MAX6729 (PFI/PFO included).