Analog Devices Inc./Maxim Integrated MAX6739XKVD7

Overview

MAX6739XKVD7 from Maxim Integrated is a dual-voltage microprocessor supervisor IC with one factory-trimmed reset threshold (VTH1 = 3.075V) and one adjustable reset input (RSTIN, 0.488V internal reference), push-pull active-low RESET output, manual reset input (MR), and 1200ms minimum reset timeout period. It monitors primary I/O supply (VCC1) and secondary core supply (VCC2) in portable battery-powered systems requiring precise power sequencing and low quiescent current.

For engineers reviewing the MAX6739XKVD7 datasheet, MAX6739XKVD7 pinout, MAX6739XKVD7 application, or MAX6739XKVD7 equivalent, this device is selected for dual-rail voltage monitoring where one rail requires fixed-precision supervision (e.g., 3.3V I/O) and the other demands flexible low-voltage tracking (e.g., sub-1.8V core), with guaranteed reset assertion during brownout and robust manual reset debouncing.

Technical Context

The MAX6739XKVD7 implements independent dual-supply monitoring with factory-set VTH1 = 3.075V (±1.5% over -40°C to +85°C) and RSTIN referenced to a precision 0.488V bandgap comparator. Its push-pull RESET output drives high to VCC1 without external pullup, while MR features a 1.5kΩ internal pullup and 150–300µs glitch rejection.

Reset assertion occurs when either VCC1 falls below VTH1, RSTIN drops below 0.488V, or MR is pulled low; reset remains asserted for ≥1200ms after all monitored inputs exceed thresholds. The device operates from VCC1 = 1.0–5.5V and VCC2 = 0.9–3.3V, with total supply current ≤10µA at +25°C.

Key Specifications

Pinout & Package

MAX6739XKVD7 is housed in a 5-pin SC70 package (2.0mm × 1.25mm, 0.65mm pitch) with exposed pad for thermal enhancement and standard JEDEC moisture sensitivity level MSL-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6738XKVD7, MAX6739XKVD7 eliminates external pullup component count and improves noise immunity; versus TPS3808G33DBVR, it adds critical RSTIN flexibility and extended timeout for complex multi-rail systems-justifying its use where core voltage adaptability and robust reset hold time are mandatory.

Availability

MAX6739XKVD7 is available at Aetrix Electronics and suitable for portable medical sensors, notebook power management, industrial PLC I/O modules, and GPS tracking beacons requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6739XKVD7 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.

The MAX6736–MAX6745 family delivers ultra-low-power dual/triple-voltage supervisors optimized for battery-operated and multirail embedded systems demanding high accuracy, small footprint, and robust reset timing.

FAQ

What is the exact reset threshold voltage for VCC1 on MAX6739XKVD7?

The MAX6739XKVD7 has a factory-trimmed VCC1 reset threshold of 3.075V, specified with ±1.5% tolerance over the full -40°C to +85°C operating temperature range. This value is confirmed in Table 1 of the datasheet under suffix 'T' for VCC1 and 'D' for VCC2, and applies directly to the MAX6739XKVD7 ordering code. The threshold is internally generated using a precision bandgap reference and laser-trimmed during wafer test.

Does MAX6739XKVD7 support monitoring a 1.0V core supply?

Yes, MAX6739XKVD7 supports monitoring a 1.0V core supply using its RSTIN pin. With an internal 0.488V reference, a simple resistor divider (e.g., R1 = 1.2MΩ, R2 = 1MΩ) scales 1.0V down to ~0.455V at RSTIN-below the 0.488V trip point. The MAX6739XKVD7's <10nA RSTIN input leakage ensures minimal error, and the resulting trip point accuracy depends only on resistor tolerance and temperature drift.

What is the function of the MR pin on MAX6739XKVD7 and how is it biased?

The MR pin on MAX6739XKVD7 is an active-low manual reset input with an internal 1.5kΩ pullup resistor to VCC1, allowing direct connection to a momentary switch to ground without external components. A ≥1µs low pulse forces RESET low immediately, and reset remains asserted for the full 1200ms timeout after MR returns high. The MR pin accepts CMOS logic levels and provides 100ns glitch rejection to prevent spurious resets from switch bounce.

Can MAX6739XKVD7 be used in a system with only one supply voltage?

Yes, MAX6739XKVD7 can supervise a single supply by connecting VCC2 to the same rail as VCC1 or tying VCC2 to GND (if within absolute max rating), while using RSTIN for secondary monitoring. Its dual-comparator architecture does not require both VCC1 and VCC2 to be active-VCC2 monitoring is optional. The MAX6739XKVD7 will assert RESET if VCC1 falls below 3.075V or RSTIN drops below 0.488V, making it fully functional as a single-supply supervisor with adjustable backup input.

What package type and dimensions does MAX6739XKVD7 use?

MAX6739XKVD7 uses a 5-pin SC70 package (also labeled SC70-5), measuring 2.0mm × 1.25mm with 0.65mm lead pitch. It complies with JEDEC MO-203AA and has an exposed thermal pad. The package is rated MSL-1 (unlimited floor life) and supports both leaded and lead-free solder reflow profiles. Pin 1 is marked by a dot, and the pinout follows the standard SC70 top-view orientation: RESET (1), GND (2), MR (3), VCC2 (4), VCC1 (5).