Analog Devices Inc./Maxim Integrated MAX6718UKSDD3

Overview

MAX6718UKSDD3 from Maxim Integrated is a dual-voltage microprocessor supervisory IC in 5-pin SOT23 package, monitoring VCC1 (1.8V–5.0V) and VCC2 (0.9V–3.3V) with factory-trimmed reset thresholds, 210ms minimum reset timeout, push-pull active-low RST output, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V - used in battery-powered IoT nodes for reliable power-up sequencing and brownout protection.

For engineers reviewing the MAX6718UKSDD3 datasheet, MAX6718UKSDD3 pinout, MAX6718UKSDD3 application, or MAX6718UKSDD3 equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% typical), ultra-low 14µA supply current at 3.6V, immunity to sub-20µs VCC transients, and compatibility with 1.2V/1.8V core-I/O rail architectures in portable industrial sensors.

Technical Context

The MAX6718UKSDD3 implements independent voltage comparators for VCC1 and VCC2, each with 0.5% hysteresis referenced to their respective threshold voltages, and asserts reset when either supply falls below its trimmed threshold. Its internal timer guarantees ≥210ms reset assertion after all supplies recover, with restart-on-fall behavior if voltage dips again before timeout completion.

It features a push-pull RST output referenced to VCC1, eliminating external pull-up requirements, and includes a manual-reset input (MR) with 50kΩ internal pull-up to VCC1 and 200ns MR-to-reset delay. No watchdog, RSTIN, PFI, or PFO functions are present in this variant.

Key Specifications

Pinout & Package

MAX6718UKSDD3 uses a 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), thermally optimized for high-density PCB layouts and compatible with standard reflow profiles. Pin 1 is marked with a dot; device orientation follows JEDEC MO-178.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and ADM6823ACYKSZ-RL, MAX6718UKSDD3 delivers tighter threshold accuracy (±1.5%), guaranteed operation down to 0.8V supply, and native support for asymmetric dual-rail architectures without external components - making it optimal for high-reliability embedded systems with constrained power and layout.

Availability

MAX6718UKSDD3 is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive telematics modules, and medical wearables requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX6718UKSDD3 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 and mixed-signal ICs for power, sensing, and interface applications in harsh environments.

The MAX6715A–MAX6729A family delivers ultra-low-voltage, multi-rail supervision for battery-powered and automotive systems where deterministic reset behavior under brownout conditions is mission-critical.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on MAX6718UKSDD3?

The MAX6718UKSDD3 has factory-trimmed reset thresholds of 3.075V for VCC1 and 1.665V for VCC2, with ±1.5% tolerance over -40°C to +125°C. These values are fixed per the "S" and "W" suffixes in the part number and do not require external resistor configuration. The MAX6718UKSDD3 datasheet specifies these as guaranteed minimum/maximum limits across temperature and supply variations.

Does MAX6718UKSDD3 support watchdog functionality or adjustable RSTIN monitoring?

No, MAX6718UKSDD3 does not include watchdog timer (WDI), RSTIN, PFI, or PFO functions. It is a dedicated dual-voltage supervisor with fixed VCC1/VCC2 thresholds and push-pull RST output. Watchdog capability is present only in MAX6721A–MAX6729A/MAX6797A variants, and RSTIN adjustment is exclusive to MAX6719A/MAX6720A and MAX6723A–MAX6727A families.

What is the reset timeout period for MAX6718UKSDD3, and is it adjustable?

The MAX6718UKSDD3 provides a fixed 210ms minimum reset timeout period, indicated by the "D3" suffix. This value is factory-set and non-adjustable via external components. The timeout begins when both VCC1 and VCC2 rise above their respective thresholds and ensures sufficient hold time for microprocessor initialization before release.

Can MAX6718UKSDD3 operate reliably at VCC1 = 1.8V and VCC2 = 1.2V?

Yes, MAX6718UKSDD3 is fully specified to operate with VCC1 as low as 1.8V and VCC2 as low as 0.9V. Its reset outputs remain valid and functional down to VCC1 or VCC2 = 0.8V, and all electrical characteristics-including 14µA supply current and 210ms timeout-are guaranteed across the full -40°C to +125°C range at these voltages.

Is MAX6718UKSDD3 pin-compatible with other devices in the MAX6715A–MAX6729A family?

MAX6718UKSDD3 uses the 5-pin SOT23 package shared with MAX6717AUK_ _D_+T variants, but pin functions differ across subfamilies. Specifically, MAX6718UKSDD3 has RST/GND/MR/VCC2/VCC1 pinout, while variants with WDI, RSTIN, or PFI use different pin allocations. Always verify pin mapping against the official MAX6718UKSDD3 datasheet - direct substitution without layout review is not recommended.