Analog Devices Inc./Maxim Integrated MAX6742XKVD3

Overview

The MAX6742XKVD3 from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC that monitors a primary V_CC1 supply and provides an independent power-fail comparator (PFI/PFO). It features factory-trimmed reset thresholds (V_TH1 = 2.925 V, V_TH2 = 1.575 V), 150 ms minimum reset timeout, 6 µA supply current, and operates over –40°C to +85°C. It is used in portable battery-powered systems requiring precise power sequencing and early brownout warning.

For engineers reviewing the MAX6742XKVD3 datasheet, MAX6742XKVD3 pinout, MAX6742XKVD3 application, or MAX6742XKVD3 equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options - all grounded in Maxim's official specifications for the MAX6742XKVD3 variant.

Technical Context

The MAX6742XKVD3 integrates two core monitoring functions: a primary V_CC1 reset monitor with fixed 2.925 V threshold and an independent power-fail comparator with 0.488 V internal reference on PFI. Its open-drain RESET output includes a 50 kΩ internal pullup to V_CC1, enabling manual reset detect without external components.

It asserts RESET when V_CC1 falls below 2.925 V or PFI drops below 0.488 V, maintains RESET for ≥150 ms after recovery, and deasserts PFO immediately when PFI rises above threshold-no timeout. The device uses BiCMOS process (249 transistors) and supports transient immunity up to 35 µs at 100 mV overdrive.

Key Specifications

Pinout & Package

MAX6742XKVD3 is housed in a space-saving 5-pin SC70-5 package (2.0 mm × 1.25 mm, 0.95 mm height), optimized for high-density portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6742XKVD3, MAX6745XKVD3 offers push-pull drive for simplified interface but forfeits manual reset detect capability; TPS3808G15DBVR reduces supply current by 73% but removes critical power-fail warning - making MAX6742XKVD3 the only option supporting preemptive shutdown in battery-critical systems.

Availability

MAX6742XKVD3 is available at Aetrix Electronics and suitable for portable/battery-powered equipment, multivoltage systems, and GPS equipment requiring stable component supply across extended production lifecycles.

Supply support for MAX6742XKVD3 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 management, sensing, and interface applications in industrial, medical, and consumer markets.

The MAX6736–MAX6745 family was engineered specifically for low-power, multivoltage microprocessor supervision in space-constrained portable electronics - emphasizing factory-trimmed accuracy, nanoscale leakage control, and integrated power-fail signaling.

FAQ

What is the exact reset threshold voltage for V_CC1 on the MAX6742XKVD3?

The MAX6742XKVD3 has a factory-trimmed V_CC1 reset threshold of 2.925 V, with ±1.5% tolerance over –40°C to +85°C. This value is confirmed in Table 2 of the MAX6736–MAX6745 datasheet under suffix "S" for V_CC1 and "V" for V_CC2, matching the "SV" designation embedded in MAX6742XKVD3. The MAX6742XKVD3 does not support adjustable thresholds on V_CC1.

Does the MAX6742XKVD3 provide manual reset functionality?

Yes - the MAX6742XKVD3 implements manual reset detect via its open-drain RESET output, which includes a 50 kΩ internal pullup to V_CC1. When a pushbutton pulls RESET low, the device recognizes it as a manual reset event and holds RESET asserted for the full 150 ms timeout period after release. No dedicated MR pin is present; this function is integrated into the RESET terminal per Figure 2 and Pin Description.

What is the role of the PFI and PFO pins on the MAX6742XKVD3?

On the MAX6742XKVD3, PFI is the noninverting input of an independent power-fail comparator referenced to an internal 0.488 V threshold; PFO is its open-drain active-low output. When PFI voltage falls below 0.488 V, PFO asserts immediately (35 µs propagation delay) with no timeout - enabling rapid system-level responses like data save or suspend. The MAX6742XKVD3 uses these pins exclusively for auxiliary supply monitoring, separate from V_CC1/V_CC2 reset logic.

Can the MAX6742XKVD3 monitor negative voltages?

Yes - the MAX6742XKVD3's PFI input can monitor negative supplies using the circuit in Figure 4A of the datasheet: a resistor divider referenced to V_CC1 converts the negative rail into a positive voltage at PFI. When the negative supply is valid, PFO is low; as it collapses, PFO goes high. Accuracy depends on resistor tolerance and PFI threshold drift, but the MAX6742XKVD3's 0.488 V reference and <10 nA input leakage enable reliable operation down to –5 V with proper scaling.

What package type and footprint does the MAX6742XKVD3 use?

The MAX6742XKVD3 is supplied in a 5-pin SC70-5 package (2.0 mm × 1.25 mm, 0.95 mm height) with gull-wing leads. Pin 1 is RESET, Pin 2 is GND, Pin 3 is PFI, Pin 4 is PFO, and Pin 5 is V_CC1, as shown in the "Pin Configurations" section (page 15) of the MAX6736–MAX6745 datasheet. This footprint is compatible with standard SC70 reflow profiles and supports 0.5 mm pitch routing.