Analog Devices Inc./Maxim Integrated MAX997EUA+

Overview

The MAX997EUA+ from Maxim Integrated is a single ultra-high-speed comparator with internal hysteresis, optimized for +3V or +5V single-supply operation. It features 4.5ns propagation delay (5mV overdrive), 5mA supply current per comparator, ±3.5mV input-referred hysteresis, and Beyond-the-Rails™ input range extending 100mV beyond both rails - used in GPS receivers, high-speed sampling circuits, and threshold detection where fast, clean switching is critical.

For engineers reviewing the MAX997EUA+ datasheet, MAX997EUA+ pinout, MAX997EUA+ application, or MAX997EUA+ equivalent, key selection considerations include shutdown capability (270μA), rail-to-rail-compatible output drive (±4mA to within 0.52V of GND/VCC), -40°C to +85°C temperature rating, and μMAX® 8-pin package compatibility with space-constrained portable systems.

Technical Context

The MAX997EUA+ employs a current-driven output stage enabling rapid slew rates and low static power after transition, with propagation delay skew ≤0.3ns between rising/falling edges. Its input stage integrates dual 200Ω resistors and front-to-back diode clamps, limiting differential input voltage to ≤3×VF (~2.1V) while supporting common-mode inputs from -0.1V to VCC+0.1V.

Internal 3.5mV hysteresis eliminates need for external feedback resistors and prevents oscillation near trip points; shutdown mode disables internal biasing and forces outputs to high-impedance state with <0.5μA leakage at VOUT = 5V or VCC–5V.

Key Specifications

Pinout & Package

The MAX997EUA+ is housed in an 8-pin μMAX® package (package code U8-1), measuring 3mm × 3mm × 0.8mm with exposed pad for thermal enhancement. Pin 1 is marked by a dot or beveled corner; device orientation follows standard JEDEC top-view convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX961EUA+, the MAX997EUA+ omits latch and complementary outputs to reduce pin count and cost while retaining identical speed, hysteresis, and shutdown capability - making it optimal for simple threshold detection. Versus LMH7220MK/NOPB, it integrates hysteresis and shutdown, eliminating two external resistors and reducing system-level power by 33% in duty-cycled applications.

Availability

MAX997EUA+ is available at Aetrix Electronics and suitable for GPS receivers, high-speed sampling circuits, and portable/battery-powered systems requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MAX997EUA+ 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 high-speed ICs for demanding industrial, communications, and consumer applications.

The MAX997EUA+ belongs to Maxim's ultra-high-speed comparator family targeting low-voltage, low-power, rail-enhanced signal conditioning - engineered specifically for portable instrumentation, GPS frontends, and real-time threshold detection where speed, accuracy, and supply efficiency are co-critical.

FAQ

What is the maximum operating supply voltage for the MAX997EUA+?

The MAX997EUA+ supports a supply voltage range of 2.7V to 5.5V. Absolute maximum rating is 6V between VCC and GND. Operation above 5.5V risks permanent damage, and performance is not guaranteed outside the specified 2.7V–5.5V range. The MAX997EUA+ is designed for robust +3V and +5V single-supply systems, including battery-powered devices where voltage may sag or surge during operation.

Does the MAX997EUA+ have internal hysteresis, and what is its value?

Yes, the MAX997EUA+ includes fixed internal hysteresis of 3.5mV (input-referred). This hysteresis is factory-trimmed and temperature-stable across -40°C to +85°C, eliminating the need for external positive-feedback resistors. It ensures clean, chatter-free switching in noisy environments - a key feature distinguishing the MAX997EUA+ from general-purpose comparators that require external hysteresis networks.

What is the function of the SHDN pin on the MAX997EUA+?

The SHDN pin on the MAX997EUA+ is an active-high shutdown control. When pulled high, it disables internal bias circuitry, reducing supply current per comparator to 270μA and placing outputs in high-impedance state. For normal operation, SHDN must be tied to GND. The MAX997EUA+ requires SHDN = low before enabling latch or output functions - improper sequencing may result in indeterminate output states.

Can the MAX997EUA+ accept input voltages below ground or above VCC?

Yes, the MAX997EUA+ features Beyond-the-Rails™ input capability: either input (IN+ or IN−) can swing from -0.1V to VCC+0.1V while maintaining correct output logic state and specified propagation delay. This allows direct interfacing with transducers, op-amp outputs, or other sources that exceed supply rails - a capability confirmed in the Electrical Characteristics table under Input Common-Mode Voltage Range (VCMR).

What package type is used for the MAX997EUA+ and what are its key mechanical features?

The MAX997EUA+ uses an 8-pin μMAX® package (package code U8-1), measuring 3mm × 3mm × 0.8mm with exposed thermal pad. It is RoHS-compliant (indicated by "+" suffix) and features gull-wing leads compatible with standard SMT reflow. The μMAX® footprint matches industry-standard SO-8 land patterns in width/length but is significantly thinner - enabling compact, low-profile PCB layouts in space-constrained portable electronics.