Analog Devices Inc./Maxim Integrated MAX6718AUKYDD3+T

Overview

MAX6718AUKYDD3+T from Maxim Integrated is a dual-supply ultra-low-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (1.8V–5.0V) and VCC2 (0.9V–3.3V) with factory-trimmed reset thresholds, 280ms minimum reset timeout, push-pull active-low RST output, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V - used in telecom power management and industrial embedded systems.

For engineers reviewing the MAX6718AUKYDD3+T datasheet, MAX6718AUKYDD3+T pinout, MAX6718AUKYDD3+T application, or MAX6718AUKYDD3+T equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temperature), low 14µA typical supply current at 3.6V, immunity to sub-20µs VCC transients, and compatibility with manual-reset, watchdog, and power-fail signaling in space-constrained designs.

Technical Context

The MAX6718AUKYDD3+T implements independent voltage comparators for VCC1 and VCC2, each referenced to precision internal bandgap references, with hysteresis of 0.5% of threshold voltage to prevent chatter during slow supply ramps. Its reset logic asserts RST low when either supply falls below its trimmed threshold and holds for a fixed 280ms (min) timeout after both supplies recover.

This variant includes push-pull RST output referenced to VCC1, manual-reset input (MR) with 50kΩ internal pullup to VCC1, and operates across –40°C to +125°C. It lacks RSTIN, WDI, PFI, and PFO functions - confirmed by pin mapping and suffix code "Y" (dual-supply, MR, push-pull RST, D3 timeout).

Key Specifications

Pinout & Package

SOT23-6 package (package code U6+1), 1.6mm × 2.9mm footprint, 0.95mm height, thermal resistance θJA = 115°C/W (multilayer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR, MAX6718AUKYDD3+T adds essential VCC2 supervision and MR functionality for multivoltage systems; compared with ADM6718AUKYDD3-R7, it offers identical performance but differs in tape-and-reel packaging and traceability chain for legacy procurement.

Availability

MAX6718AUKYDD3+T is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC I/O modules, automotive body control units, medical infusion pump controllers, and battery-operated edge sensors requiring stable component supply across extended temperature ranges.

Supply support for MAX6718AUKYDD3+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 high-performance analog and mixed-signal ICs for power management, sensing, and connectivity in harsh environments.

The MAX6715A–MAX6729A family delivers ultra-low-voltage supervisory circuits optimized for multivoltage embedded systems where reliability, small size, and wide temperature operation are critical.

FAQ

What is the exact reset threshold voltage for MAX6718AUKYDD3+T on VCC1 and VCC2?

The MAX6718AUKYDD3+T uses the "S" suffix reset threshold code, specifying a nominal VCC1 and VCC2 reset threshold of 2.925V (typical), with min/max values of 2.850V and 3.000V respectively over temperature and process variation. This value is factory-trimmed and applies identically to both monitored supplies, enabling matched dual-rail supervision without external calibration.

Does MAX6718AUKYDD3+T support manual reset, and how is it implemented?

Yes, MAX6718AUKYDD3+T includes an active-low manual-reset (MR) input on Pin 3, featuring a 50kΩ internal pullup resistor to VCC1. Driving MR low for ≥1µs forces RST assertion for the full 280ms timeout period, even if VCC1/VCC2 remain valid. The MR input accepts CMOS logic levels and requires no external components - ideal for pushbutton or FPGA-controlled reset initiation.

What is the reset timeout period of MAX6718AUKYDD3+T, and is it adjustable?

The MAX6718AUKYDD3+T has a fixed minimum reset timeout period of 280ms, indicated by the "D3" suffix in its part number. This value is internally programmed and not user-adjustable. The timeout begins when VCC1 or VCC2 falls below threshold and ends 280ms after both supplies rise above their respective thresholds - ensuring robust hold time for complex processor boot sequences.

Can MAX6718AUKYDD3+T monitor a third supply voltage such as RSTIN or PFI?

No, MAX6718AUKYDD3+T does not support RSTIN, PFI, WDI, or PFO functions. Its pinout (SOT23-6, pins 1–6 assigned to RST, GND, MR, VCC2, VCC1, NC) and suffix "Y" confirm it is a dual-supply-only variant with manual reset and push-pull output - excluding all auxiliary monitoring features found in higher-pin-count variants like MAX6723A or MAX6728A.

What package type and thermal characteristics does MAX6718AUKYDD3+T use?

MAX6718AUKYDD3+T is packaged in a 6-pin SOT23 (package code U6+1), measuring 1.6mm × 2.9mm with 0.95mm height. On a multilayer PCB, its junction-to-ambient thermal resistance (θJA) is 115°C/W and junction-to-case (θJC) is 80°C/W - enabling reliable operation up to +125°C ambient when mounted with standard solder reflow profiles and adequate copper pour.