Analog Devices Inc./Maxim Integrated MAX6718UKTGD3+T

Overview

MAX6718UKTGD3+T from Maxim Integrated is a dual-voltage microprocessor supervisory IC in 5-pin SOT23 package, monitoring VCC1 (primary) and VCC2 (secondary) supplies with factory-trimmed reset thresholds of 4.625V (VTH1) and 3.075V (VTH2), 210ms minimum reset timeout, push-pull active-low RST output, and manual reset input. It ensures reliable system boot and brownout recovery in space-constrained embedded power management.

For engineers reviewing the MAX6718UKTGD3+T datasheet, MAX6718UKTGD3+T pinout, MAX6718UKTGD3+T application, or MAX6718UKTGD3+T equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temperature), guaranteed reset validity down to VCC1/VCC2 = 0.8V, low 14µA typical supply current at 3.6V, and compatibility with manual reset and watchdog-free designs.

Technical Context

The MAX6718UKTGD3+T implements independent voltage comparators for VCC1 and VCC2, each with internal hysteresis (0.5% of VTH) and tempco of 20ppm/°C. Reset assertion occurs when either supply falls below its trimmed threshold, and reset remains asserted for ≥210ms after both supplies recover.

It features a push-pull RST output referenced to VCC1, an internal 50kΩ pullup on MR, and operates across -40°C to +85°C. No watchdog or RSTIN/PFI functionality is included - confirmed by Selector Guide and Pin Configuration tables showing only VCC1, VCC2, GND, MR, and RST pins.

Key Specifications

Pinout & Package

MAX6718UKTGD3+T uses a 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead-free (+T suffix), with thermal pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6716UTLTD3-T, MAX6718UKTGD3+T saves board space and simplifies design with push-pull RST and integrated MR, while TPS3808G33DBVR offers lower cost for single-rail applications but cannot replace dual-monitoring functionality without architecture changes.

Availability

MAX6718UKTGD3+T is available at Aetrix Electronics and suitable for industrial PLCs, network routers, medical handhelds, and smart energy meters requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MAX6718UKTGD3+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.

The MAX6715–MAX6729 family was designed specifically for compact, multivoltage embedded systems needing reliable, low-quiescent-current supervision without external components - targeting space-constrained applications where dual-rail integrity is mission-critical.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6718UKTGD3+T?

The MAX6718UKTGD3+T has factory-trimmed VCC1 reset threshold of 4.625V (typical) and VCC2 reset threshold of 3.075V (typical), with ±1.5% tolerance over -40°C to +85°C. These values are fixed by the "LT" suffix per Maxim's Reset Voltage Threshold Suffix Guide and confirmed in the Electrical Characteristics table.

Does the MAX6718UKTGD3+T include a watchdog timer or power-fail monitor?

No, the MAX6718UKTGD3+T does not include watchdog timer or power-fail monitor functionality. Per the Selector Guide and Pin Configuration, it is a dual-voltage supervisor with only VCC1, VCC2, GND, MR, and RST pins - confirming absence of WDI, PFI, or PFO terminals. The "D3" suffix denotes 210ms reset timeout only.

What is the function of the MR pin on the MAX6718UKTGD3+T and how should it be used?

The MR pin on the MAX6718UKTGD3+T is an active-low manual reset input with internal 50kΩ pullup to VCC1. Pulling MR low for ≥1µs forces a reset pulse lasting ≥210ms. If unused, MR may be left floating or tied to VCC1. It supports TTL/CMOS logic levels and requires no external debounce circuitry for momentary switch interfaces.

Can the MAX6718UKTGD3+T operate reliably when VCC1 drops below 1.0V?

Yes, the MAX6718UKTGD3+T guarantees valid reset output logic state down to VCC1 or VCC2 = 0.8V, as specified in the Absolute Maximum Ratings and Detailed Description sections. This ensures deterministic reset behavior during deep brownout conditions common in battery-backed or unregulated power systems.

What package type and lead finish does the MAX6718UKTGD3+T use?

The MAX6718UKTGD3+T uses a 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm) with lead-free (RoHS-compliant) finish, indicated by the "+T" suffix per Maxim's Ordering Information. It is rated for -40°C to +85°C operation and features a non-connected thermal pad.