Analog Devices Inc./Maxim Integrated MAX6718UKSVD3+T

Overview

MAX6718UKSVD3+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 5-pin SOT23 package, monitoring VCC1 (4.625V threshold) and VCC2 (3.075V threshold) with 210ms reset timeout, push-pull active-low RST output, manual reset input, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V - used in multivoltage embedded systems requiring reliable power-on reset and brownout detection.

For engineers reviewing the MAX6718UKSVD3+T datasheet, MAX6718UKSVD3+T pinout, MAX6718UKSVD3+T application, or MAX6718UKSVD3+T equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temperature), ultra-low 14µA supply current at 3.6V, immunity to sub-20µs VCC transients, and compatibility with 1.8V/3.3V core-I/O rail architectures.

Technical Context

The MAX6718UKSVD3+T implements independent voltage comparators for primary (VCC1) and secondary (VCC2) supplies, each with factory-trimmed thresholds (4.625V and 3.075V respectively), and a shared reset timeout timer (210ms min) that restarts on any fault condition. It uses BiCMOS process technology to achieve 20ppm/°C threshold tempco and 0.5% hysteresis referenced to typical VTH.

This device integrates a 50kΩ internal pullup on MR, supports TTL/CMOS-compatible manual reset triggering with 1µs minimum pulse width and 100ns glitch rejection, and guarantees correct RST logic state even when either supply drops to 0.8V - enabling robust operation during deep brownout events without external support circuitry.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5, surface-mount, 1.6mm × 2.9mm footprint, 1.1mm height, lead-free (+T suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and ADM6718ARJZ-4633-R7, the MAX6718UKSVD3+T uniquely delivers push-pull RST in a 5-pin SOT23 while maintaining 4.625V/3.075V precision thresholds and 0.8V reset validity - reducing component count and PCB area without sacrificing accuracy or robustness.

Availability

MAX6718UKSVD3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, medical patient monitors, and POS terminals requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6718UKSVD3+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 precision analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.

The MAX6715–MAX6729 family was engineered specifically for multivoltage embedded systems needing compact, low-power, high-accuracy power-supply supervision with guaranteed operation down to 0.8V supply levels.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6718UKSVD3+T?

The MAX6718UKSVD3+T has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, with ±1.5% tolerance over the full -40°C to +85°C operating range. These values are encoded in the "SV" suffix per Maxim's Reset Voltage Threshold Suffix Guide and verified in the Electrical Characteristics table of the official datasheet.

Does the MAX6718UKSVD3+T support watchdog functionality?

No, the MAX6718UKSVD3+T does not include a watchdog timer. Per Maxim's Selector Guide, only MAX6721 through MAX6729 variants integrate WDI functionality. The MAX6718UKSVD3+T is a dual-supply supervisor with manual reset (MR) and push-pull RST output, but no watchdog input or timeout monitoring capability.

What is the reset timeout period for the MAX6718UKSVD3+T and how is it set?

The MAX6718UKSVD3+T has a minimum reset timeout period of 210ms, indicated by the "D3" suffix in its part number. This value is factory-programmed and non-adjustable. The timeout begins when all monitored supplies rise above their thresholds and continues unconditionally, ensuring µP initialization completes before reset deassertion.

Can the MAX6718UKSVD3+T monitor a third voltage rail such as a 1.8V core supply?

No, the MAX6718UKSVD3+T is a dual-voltage supervisor and lacks the RSTIN input required for triple-voltage monitoring. Devices like MAX6719UKSVD3+T or MAX6723UKSVD3+T provide the adjustable RSTIN pin (626mV reference) for monitoring auxiliary rails down to 0.62V - the MAX6718UKSVD3+T supports only VCC1 and VCC2 inputs.

Is the MAX6718UKSVD3+T pin-compatible with other devices in the MAX6715–MAX6729 family?

The MAX6718UKSVD3+T uses the 5-pin SOT23-5 package and shares pinout with MAX6717UK_ _D_ -T variants (RST, GND, MR, VCC2, VCC1), but is not pin-compatible with 6-pin or 8-pin members like MAX6716 or MAX6725. Its pin mapping is specific to dual-supply, push-pull, 5-pin configurations - always verify against the Pin Description table before substitution.