Analog Devices Inc./Maxim Integrated MAX6717UKLRD3

Overview

The MAX6717UKLRD3 from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 5-pin SOT23 package, monitoring primary (VCC1) and secondary (VCC2) supplies with factory-trimmed reset thresholds of 4.625V (VTH1) and 3.075V (VTH2), 210ms minimum reset timeout, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V - used in telecom power sequencing and industrial embedded controllers.

For engineers reviewing the MAX6717UKLRD3 datasheet, MAX6717UKLRD3 pinout, MAX6717UKLRD3 application, or MAX6717UKLRD3 equivalent, key selection criteria include dual-supply threshold accuracy, open-drain RST output logic, -40°C to +125°C operation, and compatibility with low-voltage µP reset interfaces requiring no external pullup on MR.

Technical Context

This device implements two independent voltage comparators with hysteresis (0.5% typical), internal 20ppm/°C tempco reference, and a digital timeout counter that restarts on any supply re-fall below threshold before timeout completion. It uses separate VCC1- and VCC2-referenced reset outputs with push-pull or open-drain options.

The MAX6717UKLRD3 features an internal 50kΩ MR pullup, supports manual reset assertion with 1µs minimum pulse width and 100ns glitch rejection, and guarantees correct reset state when either supply remains ≥0.8V - enabling robust brownout detection in battery-backed systems.

Key Specifications

Pinout & Package

Package: 5-pin SOT23 (1.6mm × 2.9mm × 1.1mm, JEDEC MO-178AA). Pinout validated per Maxim datasheet Rev 3 (19-0536), Figure 7 and Pin Description Table (page 7).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6717UKLRD3, the MAX6716AUTLTD3-T offers identical voltage thresholds and timeout but requires board redesign for push-pull drive, while the TPS3808G33DBVR reduces supply current by 80% yet sacrifices dual-supply monitoring - making MAX6717UKLRD3 optimal for space-constrained dual-rail industrial designs.

Availability

MAX6717UKLRD3 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6717UKLRD3 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, sensing, and interface applications in demanding environments.

The MAX6715A–MAX6729A family delivers ultra-low-voltage µP supervisory circuits optimized for dual/triple supply monitoring in space-constrained, wide-temperature industrial and automotive systems.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6717UKLRD3?

The MAX6717UKLRD3 has a factory-trimmed VCC1 reset threshold of 4.625V (minimum 4.500V, maximum 4.750V) as specified in the Reset Voltage Threshold Suffix Guide for suffix 'D'. This value is measured at VCC1 falling edge with 0.5% hysteresis and 20ppm/°C tempco, ensuring stable trip point across -40°C to +125°C operation. The MAX6717UKLRD3 does not support user adjustment of this threshold.

Does the MAX6717UKLRD3 support monitoring a third voltage rail?

No, the MAX6717UKLRD3 is a dual-supply supervisor and does not include the RSTIN input required for auxiliary voltage monitoring. That feature is present only in variants like MAX6719A/MAX6720A (5-pin with RSTIN) or MAX6723A–MAX6727A (6- or 8-pin). The MAX6717UKLRD3 monitors only VCC1 and VCC2, with fixed thresholds determined by its part number suffix 'D'.

What is the function of Pin 3 (MR) on the MAX6717UKLRD3 and how should it be used?

Pin 3 is the active-low Manual-Reset input with an internal 50kΩ pullup to VCC1. Pulling MR low for ≥1µs forces reset assertion for the full 210ms timeout period, then holds reset active for the duration even after MR returns high. If unused, MR may be left floating (due to internal pullup) or tied to VCC1. The MAX6717UKLRD3 does not require external debounce components for momentary switch use.

Is the reset output of the MAX6717UKLRD3 push-pull or open-drain?

The MAX6717UKLRD3 features an open-drain RST output (Pin 1), requiring an external pullup resistor to the system's reset rail voltage (typically VCC1 or 3.3V). This configuration enables wired-OR connection with other reset sources and supports level-shifting across different voltage domains. The MAX6717UKLRD3 does not provide push-pull drive - that option is available only in the 'U' suffix variants like MAX6716AUTLTD3-T.

What is the minimum supply voltage at which the MAX6717UKLRD3 guarantees correct reset behavior?

The MAX6717UKLRD3 guarantees valid reset output logic state when either VCC1 or VCC2 remains ≥0.8V, as confirmed in Absolute Maximum Ratings and Electrical Characteristics tables. Below 0.8V, reset behavior is undefined. For applications requiring reset assertion down to 0V, a 100kΩ pulldown resistor from RST to GND is recommended - though this applies only to push-pull variants, not the open-drain MAX6717UKLRD3.