Analog Devices Inc./Maxim Integrated MAX6342ZUT-T

Overview

MAX6342ZUT-T from Maxim Integrated is a precision microprocessor supervisory circuit in SOT23-6 package, providing factory-trimmed 2.33V VCC reset threshold, active-low push-pull RESET output, and manual-reset (MR) input. It monitors supply voltage integrity and delivers a guaranteed 100ms minimum reset pulse width down to VCC = +1V, used in battery-powered telecom equipment for reliable power-up sequencing and brownout protection.

For engineers reviewing the MAX6342ZUT-T datasheet, MAX6342ZUT-T pinout, MAX6342ZUT-T application, or MAX6342ZUT-T equivalent, key selection criteria include its 2.33V reset threshold tolerance (±25mV), PFI comparator with 1.25V reference for power-fail warning, and guaranteed RESET validity over full -40°C to +125°C industrial temperature range.

Technical Context

The MAX6342ZUT-T implements a precision bandgap-based reset generator with internal 1.25V reference for both VCC threshold detection and independent PFI comparator. Its MR input features debounced CMOS-compatible logic with 1µs glitch rejection and 100ns minimum pulse width requirement.

Reset assertion is triggered when VCC falls below 2.33V (±25mV at +25°C) or MR is pulled low; RESET remains active for ≥100ms after VCC rises above threshold or MR returns high. The push-pull output drives low to ≤0.4V at 1.2mA sink current and high to ≥0.8×VCC at 50µA source current.

Key Specifications

Pinout & Package

Package: 6-pin SOT23-6, 1.6mm × 2.9mm footprint, surface-mount, lead-free compatible (suffix -T).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6343ZUT-T, the MAX6342ZUT-T eliminates external pull-up components and simplifies layout; compared with TLV809EZDBZR, it adds critical PFI-based early-warning capability and MR flexibility for field-serviceable systems.

Availability

MAX6342ZUT-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, telecom equipment, and multivoltage systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for MAX6342ZUT-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 industrial, automotive, and communications markets.

The MAX6342–MAX6345 family targets high-reliability digital systems needing simultaneous VCC supervision, power-fail warning, and manual reset-optimized for space-constrained portable and telecom applications.

FAQ

What is the exact reset threshold voltage of the MAX6342ZUT-T and how tightly is it specified?

The MAX6342ZUT-T has a factory-trimmed VCC reset threshold of 2.33V, with a maximum tolerance of ±25mV at +25°C and ±30mV over the full -40°C to +125°C operating range. This precision eliminates the need for external resistor dividers or calibration, ensuring consistent reset behavior across production units and temperature extremes. The 2.33V threshold is specifically selected to reliably detect brownout conditions in 2.5V and 3.3V systems before critical logic levels are violated.

Does the MAX6342ZUT-T provide power-fail detection capability, and how is it implemented?

Yes, the MAX6342ZUT-T includes a dedicated power-fail comparator with a precise +1.25V internal reference connected to the PFI pin. When the voltage applied to PFI falls below 1.25V, the PFO output goes low, providing an early warning of impending supply failure. This function operates independently of the main reset generator, allowing designers to implement graceful shutdown routines-such as saving state or disabling peripherals-before the VCC reset threshold is crossed. The PFI input accepts voltages up to VCC + 0.3V and exhibits leakage <1.2nA.

What type of reset output does the MAX6342ZUT-T feature, and what are its drive specifications?

The MAX6342ZUT-T features an active-low push-pull RESET output. It guarantees VOL ≤ 0.4V at ISINK = 1.2mA (for VCC > 2.7V) and VOH ≥ 0.8 × VCC at ISOURCE = 50µA. This eliminates the need for an external pull-up resistor, reducing component count and improving noise immunity compared to open-drain alternatives. The output remains asserted for a minimum of 100ms after VCC rises above the 2.33V threshold or after the MR input is released, ensuring robust µP initialization.

How does the manual-reset (MR) input of the MAX6342ZUT-T behave, and what are its interface requirements?

The MR input of the MAX6342ZUT-T is a CMOS-compatible, active-low signal that forces RESET assertion when pulled below 0.3 × VCC. It includes built-in 1µs glitch rejection and requires a minimum pulse width of 100ns to register. Internal debouncing removes the need for external RC filters, making it ideal for direct connection to mechanical pushbuttons. When unused, MR should be tied to VCC through a weak pull-up; the device specifies VIH ≥ 0.7 × VCC and includes a 100kΩ internal pull-up resistor if left floating.

What is the operating temperature range and supply voltage range supported by the MAX6342ZUT-T?

The MAX6342ZUT-T is fully specified for continuous operation from -40°C to +125°C ambient temperature and supports supply voltages from +1.0V to +5.5V on the VCC pin. Its reset output remains valid down to VCC = +1V, enabling reliable supervision even during severe brownout events. This wide operating envelope makes the MAX6342ZUT-T suitable for under-hood automotive modules, industrial controllers, and battery-powered edge devices where thermal and voltage margins are tight.