Analog Devices Inc./Maxim Integrated MAX6720AUTSDD3+

Overview

MAX6720AUTSDD3+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (4.625V threshold) and VCC2 (3.075V threshold) with 210ms reset timeout, push-pull active-low RST output, and adjustable RSTIN input for third-voltage monitoring down to 0.626V. It guarantees valid reset assertion down to VCC1 or VCC2 = 0.8V and supports industrial embedded systems requiring reliable power-up sequencing and brownout detection.

For engineers reviewing the MAX6720AUTSDD3+ datasheet, MAX6720AUTSDD3+ pinout, MAX6720AUTSDD3+ application, or MAX6720AUTSDD3+ equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over -40°C to +125°C), ultra-low 14µA typical supply current at 3.6V, immunity to sub-20µs VCC transients, and compatibility with manual-reset, watchdog, and power-fail monitoring functions.

Technical Context

The MAX6720AUTSDD3+ implements two independent voltage comparators with factory-trimmed thresholds (VTH1 = 4.625V, VTH2 = 3.075V), each referenced to internal bandgap references with 20ppm/°C tempco and 0.5% hysteresis. Its reset logic asserts RST low when either supply falls below its threshold and holds for a guaranteed minimum 210ms after both supplies recover.

This device integrates an externally adjustable RSTIN comparator (626.5mV reference), a manual-reset input with 50kΩ internal pullup, and supports push-pull RST output referenced to VCC1. It operates across -40°C to +125°C with supply voltage range 0.8V–5.5V on either VCC1 or VCC2, ensuring robustness in automotive and industrial environments.

Key Specifications

Pinout & Package

MAX6720AUTSDD3+ uses a 6-pin SOT23 package (2.9mm × 1.6mm × 1.1mm height) with gull-wing leads, RoHS-compliant and lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720AUTSDD3+, the MAX6720AUTSD3+ offers identical supervision functionality but mandates external pullup for reset signaling, increasing component count; the TPS3808G33DBVR reduces quiescent current but cannot replace dual-rail monitoring without adding a second supervisor - making MAX6720AUTSDD3+ the only single-component solution for 5V/3.3V + auxiliary rail validation.

Availability

MAX6720AUTSDD3+ is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, medical devices, and network infrastructure requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX6720AUTSDD3+ 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 high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.

The MAX6715A–MAX6729A family was designed specifically for ultra-low-voltage, multi-rail microprocessor supervision in space-constrained and thermally demanding environments, emphasizing precision threshold accuracy, low power, and guaranteed operation down to 0.8V supply.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on MAX6720AUTSDD3+?

The MAX6720AUTSDD3+ has factory-trimmed VCC1 reset threshold of 4.625V and VCC2 reset threshold of 3.075V, with ±1.5% tolerance over the full -40°C to +125°C operating range. These values are encoded in the part number suffix "TS" (VCC1 = 4.625V) and "D" (VCC2 = 3.075V), per Maxim's Reset Voltage Threshold Suffix Guide.

Does MAX6720AUTSDD3+ support manual reset functionality?

Yes, MAX6720AUTSDD3+ includes an active-low manual-reset input (MR) on Pin 3 with internal 50kΩ pullup to VCC1. Pulling MR low forces immediate reset assertion, and the reset remains active for the full 210ms timeout period after MR returns high - enabling operator-initiated recovery or test-mode reset without firmware intervention.

Can MAX6720AUTSDD3+ monitor a third voltage rail, and how is it configured?

Yes, MAX6720AUTSDD3+ supports third-rail monitoring via the RSTIN pin (Pin 5), which compares an external voltage (applied through a resistor divider) against a precise 626.5mV internal reference. For example, to monitor a 1.8V rail, use R1 = 182kΩ and R2 = 100kΩ to set trip point at 1.8V × (100kΩ / 282kΩ) ≈ 626.5mV.

What is the reset output type and drive capability of MAX6720AUTSDD3+?

MAX6720AUTSDD3+ features a push-pull active-low RST output (Pin 1) referenced to VCC1. It sinks up to 3.2mA while asserted (VOL ≤ 0.4V) and sources up to 800µA when deasserted (VOH ≥ 0.8 × VCC1), eliminating the need for external pullup resistors and simplifying interface with modern µPs requiring strong reset drive.

Is MAX6720AUTSDD3+ qualified for automotive applications?

MAX6720AUTSDD3+ is specified for -40°C to +125°C operation and manufactured in Maxim's automotive-qualified processes. While not AEC-Q100 certified out-of-box, its electrical specifications, thermal performance, and reliability data meet requirements for non-safety-critical automotive subsystems such as body control modules and infotainment power management - subject to customer qualification.