Analog Devices Inc./Maxim Integrated MAX6720UTYDD3

Overview

MAX6720UTYDD3 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 when any monitored supply falls below its threshold, maintains reset for a factory-set 210ms (min) timeout, and guarantees valid reset operation with VCC1 or VCC2 ≥ 0.8V. It is used in multivoltage embedded systems requiring reliable power-up sequencing and brownout protection.

For engineers reviewing the MAX6720UTYDD3 datasheet, MAX6720UTYDD3 pinout, MAX6720UTYDD3 application, or MAX6720UTYDD3 equivalent, this page delivers verified specifications, SOT23-6 package details, dual-supply monitoring behavior, watchdog-free reset timing, and real-world substitution guidance - all grounded in Maxim's official electrical characteristics and pin configuration data.

Technical Context

The MAX6720UTYDD3 implements a dual-threshold voltage supervisor with independent factory-trimmed reset thresholds for VCC1 (4.625V typical) and VCC2 (3.075V typical), plus an external RSTIN comparator referenced to a 626.5mV internal bandgap. It uses a fixed 210ms minimum reset timeout period (D3 suffix) and features a push-pull RST output referenced to VCC1.

No watchdog timer or power-fail circuitry is included - confirmed by Selector Guide entry showing "√" under Manual Reset and "-" under Watchdog Input and Power-Fail Input/Output. Its reset logic remains valid across -40°C to +85°C and draws only 14µA typical supply current at 3.6V.

Key Specifications

Pinout & Package

MAX6720UTYDD3 is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6722UTYDD3, the MAX6720UTYDD3 removes watchdog overhead for simpler firmware and lower risk of spurious resets; compared with TPS3808G33DBVR, it delivers triple-supply coverage, push-pull drive, and broader voltage range - making it the only direct fit for multirail industrial controllers requiring guaranteed 0.8V reset validity.

Availability

MAX6720UTYDD3 is available at Aetrix Electronics and suitable for industrial PLC controllers, 5G small cell baseband units, medical patient monitors, and automotive ADAS camera ECUs requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C performance.

Supply support for MAX6720UTYDD3 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 industrial, communications, computing, and automotive markets.

The MAX6715–MAX6729 family delivers ultra-low-voltage, multi-rail supervisory circuits in miniature SOT23 packages - engineered specifically for space-constrained embedded systems needing robust, factory-calibrated power monitoring without software dependency.

FAQ

What is the exact reset timeout period of the MAX6720UTYDD3?

The MAX6720UTYDD3 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 MAX6720UTYDD3 does not include a watchdog timer, so this 210ms period applies exclusively to power-on reset, brownout recovery, and manual reset events.

Does the MAX6720UTYDD3 support monitoring a 1.2V core supply?

Yes, the MAX6720UTYDD3 supports monitoring a 1.2V core supply using its RSTIN pin. With a 626.5mV internal reference voltage, a simple two-resistor divider (e.g., R1 = 110kΩ, R2 = 100kΩ) scales the 1.2V rail to ~626mV at RSTIN. The MAX6720UTYDD3's ±25nA input leakage ensures minimal divider current (<100nA), preserving system efficiency while enabling accurate undervoltage detection.

Is the MAX6720UTYDD3 pin-compatible with other MAX67xx devices in SOT23-6?

The MAX6720UTYDD3 shares the same 6-pin SOT23-6 pinout with MAX6715–MAX6716, MAX6719–MAX6722, and MAX6723–MAX6724 per Maxim's Pin Configuration table. However, functional compatibility depends on feature set: MAX6720UTYDD3 provides push-pull RST, manual reset, and RSTIN - but lacks watchdog and power-fail circuitry. Swapping with MAX6721UTYDD3 (which includes watchdog) may cause unintended resets if WDI is left floating.

What is the lowest supply voltage at which the MAX6720UTYDD3 guarantees correct reset output logic?

The MAX6720UTYDD3 guarantees correct reset output logic state when either VCC1 or VCC2 remains greater than 0.8V - explicitly stated in the Absolute Maximum Ratings and Detailed Description sections. Below 0.8V, reset behavior is not specified. This 0.8V guarantee enables early fault detection during deep brownout conditions before critical logic fails, supporting fail-safe shutdown in industrial and medical systems.

Can the MAX6720UTYDD3 be used without connecting the RSTIN pin?

Yes, the RSTIN pin of the MAX6720UTYDD3 can be left unconnected or tied to VCC1 or VCC2 if third-supply monitoring is not required. The device will operate as a dual-supply supervisor (VCC1 and VCC2 only) with no impact on reset timing, threshold accuracy, or supply current. Leaving RSTIN floating is not recommended - Maxim specifies connection to a defined voltage to avoid noise-induced false resets.