Analog Devices Inc./Maxim Integrated MAX6342RUT+

Overview

MAX6342RUT+ from Maxim Integrated is a precision 6-pin SOT23 microprocessor supervisory circuit with factory-trimmed 2.63V VCC reset threshold, active-low push-pull RESET output, manual-reset (MR) input, and integrated +1.25V power-fail comparator (PFI/PFO). It operates from +1.0V to +5.5V supply voltage, guarantees valid RESET down to VCC = +1V, and delivers ≥100ms reset pulse width-designed for reliable power-up/brownout monitoring in portable and multivoltage systems.

For engineers reviewing the MAX6342RUT+ datasheet, MAX6342RUT+ pinout, MAX6342RUT+ application, or MAX6342RUT+ equivalent, this device serves as a low-quiescent-current (25µA typ), temperature-stable (–40°C to +125°C), single-supply reset supervisor with independent power-fail warning capability-critical for battery-powered equipment, telecom edge nodes, and embedded controllers requiring deterministic reset timing and supply margining.

Technical Context

The MAX6342RUT+ integrates a precision bandgap reference, comparator-based reset generator, and dedicated PFI/PFO comparator sharing a common +1.25V internal reference. Its reset assertion logic responds to VCC falling below 2.63V (±1.5% over temperature) or MR being pulled low, with guaranteed reset deassertion delay of 100–280ms after VCC recovery or MR release.

Unlike open-drain or active-high variants, the MAX6342RUT+ uses an active-low push-pull RESET output capable of sinking 1.2mA at VCC > 2.7V and sourcing 50µA at VCC > 1.2V-eliminating external pull-up resistors while maintaining compatibility with standard µP reset inputs. The debounced MR input accepts CMOS-level signals and rejects <1µs glitches.

Key Specifications

Pinout & Package

Package: 6-pin SOT23-6 (1.6mm × 2.9mm × 1.1mm), surface-mount, lead-free (RoHS-compliant).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX6342RUT+, MAX6343RUT+ trades push-pull drive simplicity for bus-sharing flexibility, while TPS3808G26DBVR reduces cost and complexity at the expense of missing the critical PFI/PFO dual-monitoring capability required for predictive power management.

Availability

MAX6342RUT+ is available at Aetrix Electronics and suitable for portable computing, telecom infrastructure, and industrial embedded systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for MAX6342RUT+ 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, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.

The MAX6342–MAX6345 family was engineered specifically for high-reliability microprocessor supervision in space-constrained, multivoltage, and battery-sensitive systems-emphasizing accuracy, temperature stability, and integrated power-fail intelligence.

FAQ

What is the exact reset threshold voltage of the MAX6342RUT+?

The MAX6342RUT+ has a factory-trimmed VCC reset threshold of 2.63V with ±1.5% tolerance over the full –40°C to +125°C temperature range. This value is laser-trimmed during production and confirmed in the Electrical Characteristics table of the official datasheet. The 'R' suffix in MAX6342RUT+ explicitly denotes the 2.63V variant, and the device maintains this accuracy without external calibration. The MAX6342RUT+ reset output asserts when VCC falls below this threshold and remains asserted for ≥100ms after VCC rises above it.

Does the MAX6342RUT+ require an external pull-up resistor on its RESET pin?

No, the MAX6342RUT+ features an active-low push-pull RESET output, meaning it actively drives both logic low and logic high states without requiring an external pull-up resistor. It can sink up to 1.2mA at VCC > 2.7V and source 50µA at VCC > 1.2V-sufficient to directly drive standard µP reset inputs. This eliminates BOM cost and layout area associated with pull-up resistors and improves noise immunity compared to open-drain alternatives like the MAX6343RUT+. The MAX6342RUT+ RESET pin is fully compliant with common µP reset interface requirements out-of-the-box.

How does the PFI/PFO function work in the MAX6342RUT+?

The MAX6342RUT+ includes a dedicated +1.25V precision reference feeding a comparator whose inverting input is the PFI pin and output is the open-drain PFO pin. When the voltage at PFI falls below +1.25V (e.g., due to a dropping battery or failing regulator), PFO is pulled low-providing an early warning independent of the main reset function. This allows µPs to initiate controlled shutdown routines before VCC crosses the 2.63V reset threshold. The MAX6342RUT+ PFI input draws only 1.2nA, enabling high-impedance resistor dividers for minimal loading on monitored supplies.

Can the MAX6342RUT+ operate reliably at VCC = +1.0V?

Yes, the MAX6342RUT+ is fully specified and guaranteed to assert a valid logic-level RESET output down to VCC = +1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures deterministic reset behavior during deep brownout conditions where other supervisors may fail to hold reset. The internal bandgap reference and comparator remain functional at this voltage, and the RESET output maintains proper VOL and VOH levels per datasheet specs. This capability makes the MAX6342RUT+ especially valuable in ultra-low-power and energy-harvesting applications where supply rails decay slowly.

What is the temperature range qualification for the MAX6342RUT+?

The MAX6342RUT+ is fully specified and production-tested over the industrial–automotive extended temperature range of –40°C to +125°C. All key parameters-including reset threshold accuracy (±1.5%), supply current (25µA typ), reset timeout period (100–280ms), and PFI threshold (1.25V ±25mV)-are guaranteed across this range. This qualification aligns with AEC-Q100 stress test requirements for Grade 1 automotive components and supports deployment in under-hood electronics, base station radios, and factory automation controllers where ambient temperatures exceed standard commercial limits. The MAX6342RUT+ SOT23-6 package is rated for 150°C junction temperature.