Analog Devices Inc./Maxim Integrated MAX6739XKVD3+T

Overview

The MAX6739XKVD3+T from Maxim Integrated is a dual-voltage microprocessor supervisor IC with one factory-trimmed reset threshold (VCC1) and one adjustable reset input (RSTIN), push-pull active-low RESET output, manual reset input (MR), and 150ms minimum reset timeout period. It monitors primary supply VCC1 at 3.075V and supports down-to-0.488V monitoring via RSTIN, operating from -40°C to +85°C in portable and multivoltage embedded systems.

For engineers reviewing the MAX6739XKVD3+T datasheet, MAX6739XKVD3+T pinout, MAX6739XKVD3+T application, or MAX6739XKVD3+T equivalent, key selection criteria include its 6µA quiescent current, SC70-5 package footprint, dual-supply supervision with adjustable threshold, MR timing compatibility, and guaranteed reset assertion during VCC1/VCC2/RSTIN undervoltage or MR assertion.

Technical Context

The MAX6739XKVD3+T implements independent voltage monitoring for VCC1 (fixed 3.075V threshold) and RSTIN (adjustable via external resistor divider referenced to 0.488V internal reference), with hysteresis of 0.5% on both thresholds. Its push-pull RESET output is referenced to VCC1 and asserts low when either monitored input falls below threshold or MR is pulled low.

Reset timeout is fixed at 150ms (min), with internal timer restart capability if any monitored supply re-falls during timeout. MR features 1.5kΩ internal pullup to VCC1, 150ms timeout after release, and 100ns glitch rejection - all specified over full -40°C to +85°C industrial temperature range.

Key Specifications

Pinout & Package

MAX6739XKVD3+T is housed in a 5-pin SC70-5 package (2.0mm × 1.25mm, 0.65mm pitch), optimized for space-constrained portable and embedded designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6739XKVD3+T, MAX6738XKVD3+T trades push-pull convenience for open-drain interoperability, while TPS3808G33DBVR reduces complexity and current draw but sacrifices RSTIN adjustability and MR integration - making MAX6739XKVD3+T optimal for compact dual-rail systems needing manual recovery.

Availability

MAX6739XKVD3+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, multivoltage systems, and notebook computers requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6739XKVD3+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 and mixed-signal ICs for power, sensing, and connectivity applications in industrial, automotive, and consumer markets.

The MAX6736–MAX6745 family delivers low-power, space-efficient µP supervision for multivoltage embedded systems - specifically engineered to replace discrete reset circuits while maintaining factory-trimmed accuracy and extended temperature operation.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6739XKVD3+T?

The MAX6739XKVD3+T has a factory-trimmed VCC1 reset threshold of 3.075V, with ±2.5% tolerance over the full -40°C to +85°C temperature range. This value is confirmed by the "T" suffix in the part number per Table 1 of the datasheet and applies specifically to the VCC1 input pin, not RSTIN or other variants.

Does the MAX6739XKVD3+T support adjustable reset monitoring, and how is it implemented?

Yes, the MAX6739XKVD3+T supports adjustable reset monitoring via its RSTIN pin, which references an internal 0.488V threshold. An external resistor divider between VCC1 and GND sets the trip point using V_{EXT_TH} = 0.488V × ((R1 + R2) / R2). The MAX6739XKVD3+T datasheet specifies RSTIN input current ≤±10nA, enabling high-value resistors for minimal power draw.

What is the function of the MR pin on the MAX6739XKVD3+T, and what timing parameters apply?

The MR pin on the MAX6739XKVD3+T is an active-low manual reset input with a 1.5kΩ internal pullup to VCC1. A ≥1µs low pulse forces RESET low, which remains asserted for 150ms (min) after MR returns high. Glitch rejection is 100ns, and the MR-to-RESET delay is 300ns - all guaranteed across -40°C to +85°C.

Is the RESET output of the MAX6739XKVD3+T push-pull or open-drain, and what are its drive capabilities?

The MAX6739XKVD3+T features a push-pull RESET output referenced to VCC1. It sources ≥800µA at VOH ≥0.8×VCC1 and sinks ≥1.2mA at VOL ≤0.4V (for VCC1 ≥2.13V). This eliminates the need for an external pullup resistor and ensures robust driving of CMOS inputs and moderate capacitive loads.

What package type and dimensions does the MAX6739XKVD3+T use, and is lead-free compliance indicated?

The MAX6739XKVD3+T uses a 5-pin SC70-5 package measuring 2.0mm × 1.25mm with 0.65mm lead pitch. The "+T" suffix confirms lead-free (RoHS-compliant) packaging per Maxim's ordering convention, replacing the standard "-T" with "+T" to denote Pb-free finish and compatible with standard reflow profiles.