Analog Devices Inc./Maxim Integrated MAX6716UTWGD3+

Overview

MAX6716UTWGD3+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 6-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 0.8V on either supply - used in telecom power sequencing and server board management.

For engineers reviewing the MAX6716UTWGD3+ datasheet, MAX6716UTWGD3+ pinout, MAX6716UTWGD3+ application, or MAX6716UTWGD3+ equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temperature), ultra-low 14µA typical supply current at 3.6V, immunity to sub-20µs VCC transients, and compatibility with 1.8V–5.0V primary and 0.9V–3.3V secondary rails.

Technical Context

The MAX6716UTWGD3+ implements factory-trimmed dual-threshold comparators with 20ppm/°C tempco and 0.5% hysteresis, driving a digital reset timeout timer with fixed 210ms minimum assertion period after all monitored supplies recover. Its push-pull RST output is referenced to VCC1 and sinks up to 3.2mA at 4.5V.

It integrates a 50kΩ internal MR pullup, supports TTL/CMOS-compatible manual reset triggering with 1µs minimum pulse width and 100ns glitch rejection, and maintains valid reset logic state even when VCC1 or VCC2 drops to 0.8V - enabling robust brownout detection in battery-backed systems.

Key Specifications

Pinout & Package

MAX6716UTWGD3+ uses a 6-pin SOT23-6 package (1.6mm × 2.9mm × 1.1mm) with gull-wing leads, RoHS-compliant lead-free finish (+ suffix), and thermal pad omitted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and ADM6716ARJZ-RL7, the MAX6716UTWGD3+ uniquely delivers factory-trimmed dual-threshold supervision with push-pull RST and integrated MR pullup in a single 6-pin SOT23, eliminating external components and enabling true dual-rail autonomy without layout modification.

Availability

MAX6716UTWGD3+ is available at Aetrix Electronics and suitable for telecom power sequencing, server board management, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6716UTWGD3+ 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 connectivity applications, with leadership in supervisory, PMIC, and interface solutions.

The MAX6715–MAX6729 family was engineered specifically for multivoltage embedded systems requiring reliable, space-constrained power monitoring - delivering dual/triple supply supervision with minimal external components and guaranteed operation across industrial temperatures.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6716UTWGD3+?

The MAX6716UTWGD3+ has a factory-trimmed VCC1 reset threshold of 4.625V (±1.5%) and VCC2 reset threshold of 3.075V (±1.5%), as defined by the "WG" suffix in its part number per Maxim's Reset Voltage Threshold Suffix Guide. These values are guaranteed over the full -40°C to +85°C operating temperature range and include 0.5% hysteresis to prevent chatter near trip points. The MAX6716UTWGD3+ does not support adjustable thresholds - all monitoring is fixed at these two levels.

Does the MAX6716UTWGD3+ require an external pullup resistor on the RST pin?

No, the MAX6716UTWGD3+ does not require an external pullup resistor on the RST pin because it features a push-pull output stage referenced to VCC1. This architecture actively drives RST high (to VCC1) and low (to GND) without external components. In contrast, open-drain variants like MAX6715 require pullups. Using the MAX6716UTWGD3+ eliminates this BOM item and ensures faster, more predictable reset timing under capacitive loads.

What is the function of Pin 6 (NC) on the MAX6716UTWGD3+?

Pin 6 on the MAX6716UTWGD3+ is designated NC (No Connect) and is internally unconnected. It must be left floating in the PCB layout; tying it to GND or VCC is not recommended as it may compromise thermal performance or ESD robustness. This pin exists for package compatibility within the MAX6715–MAX6729 family but carries no electrical function in the MAX6716UTWGD3+ variant, as confirmed by Maxim's Pin Description table and Functional Diagram.

How does the manual reset (MR) input behave during power-up of the MAX6716UTWGD3+?

During power-up, the MR input of the MAX6716UTWGD3+ is pulled high internally via a 50kΩ resistor to VCC1, so it remains inactive (no reset assertion) unless externally driven low. A low pulse ≥1µs on MR forces an immediate reset that persists for the full 210ms timeout period after MR returns high. Glitches shorter than 100ns are rejected, and the input accepts TTL/CMOS logic levels - making it compatible with pushbutton switches or FPGA GPIO without debouncing circuitry.

Can the MAX6716UTWGD3+ monitor a 1.2V supply as VCC2?

Yes, the MAX6716UTWGD3+ can monitor a 1.2V supply as VCC2 because its VCC2 input operates over 0.9V to 3.3V and the 3.075V threshold applies only to the *reset trip point*, not the supply voltage itself. When VCC2 = 1.2V, the internal comparator continuously monitors it against the 3.075V threshold - meaning reset will assert if VCC2 ever exceeds 3.075V (unlikely), but more critically, the device guarantees valid RST logic states as long as VCC2 ≥ 0.8V. For true undervoltage monitoring of 1.2V, a different variant with lower VCC2 threshold (e.g., "TD" suffix) would be required.