Analog Devices Inc./Maxim Integrated MAX997EUA

Overview

MAX997EUA from Maxim Integrated is a single ultra-high-speed comparator with internal hysteresis, optimized for +3V/+5V single-supply operation. It delivers 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 and high-speed sampling circuits.

For engineers reviewing the MAX997EUA datasheet, MAX997EUA pinout, MAX997EUA application, or MAX997EUA equivalent, key selection criteria include propagation delay vs. overdrive, shutdown current (270μA), rail-to-rail output swing (0.52V from rails), input offset voltage (±1.5mV typ), and μMAX® 8-pin package compatibility with space-constrained portable systems.

Technical Context

The MAX997EUA implements a current-driven output stage enabling fast slew rates while maintaining TTL/CMOS-compatible logic levels. Its internal 3.5mV hysteresis eliminates external feedback resistors and prevents oscillation near trip points in noisy or slow-moving signal environments.

It features a dedicated SHDN pin that places the comparator in high-impedance shutdown mode with 270μA per comparator supply current. Input protection includes dual 200Ω series resistors and front-to-back diode clamps limiting differential input voltage to ≤2.1V, ensuring robustness against overvoltage transients.

Key Specifications

Pinout & Package

The MAX997EUA is housed in an 8-pin μMAX® package (package code U8-1), measuring 3mm × 3mm with exposed pad for thermal enhancement. This RoHS-compliant, surface-mount package supports high-density PCB layouts in portable and instrumentation designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX961EUA-T, MAX997EUA removes latch logic and complementary output to reduce pin count and cost while retaining identical speed and power specs; versus TLV3501DBVR, it trades 3.25mA lower active current for guaranteed hysteresis and simplified design - making it preferable for noise-prone, space-constrained applications.

Availability

MAX997EUA is available at Aetrix Electronics and suitable for GPS receivers, portable/battery-powered systems, and high-speed sampling circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

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 and mixed-signal ICs for industrial, communications, and consumer applications, with emphasis on performance, integration, and reliability.

The MAX997EUA belongs to Maxim's ultra-high-speed comparator family targeting low-voltage, low-power timing-critical systems - engineered specifically for single-supply operation, rail-extending inputs, and minimal external component count.

FAQ

What is the operating temperature range for the MAX997EUA?

The MAX997EUA is specified for operation from -40°C to +85°C (E grade). All electrical characteristics in its datasheet are guaranteed across this full industrial temperature range, with production testing performed at +25°C and design validation covering min/max extremes. The MAX997EUA does not support extended temperature grades such as +125°C - that specification applies only to the MAX999AAUK variant.

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

Yes, the MAX997EUA includes fixed internal hysteresis of 3.5mV (input-referred), which is explicitly confirmed in the Electrical Characteristics table. This hysteresis provides noise immunity during slow or noisy transitions and eliminates the need for external positive-feedback resistors. The 3.5mV value is consistent across all E-grade packages including the μMAX® 8-pin variant used by MAX997EUA.

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

The MAX997EUA uses the 8-pin μMAX® package (package code U8-1), a 3mm × 3mm surface-mount package with exposed thermal pad. It is RoHS-compliant and designed for high-density layouts. Land pattern number 90-0092 applies, and the package supports reflow soldering per JEDEC J-STD-020. Pin 1 is located at the top-left corner when viewing the top mark side.

Can the MAX997EUA operate from a 3.3V supply, and how does performance change vs. 5V?

Yes, the MAX997EUA operates from 2.7V to 5.5V, fully supporting 3.3V nominal supplies. Propagation delay increases slightly - from 4.5ns (typ) at 5V to ~4.8ns at 3.3V - and supply current drops from 6.5mA to ~5.2mA (typ). Output swing remains within 0.52V of rails, and input common-mode range adapts to VCC, preserving Beyond-the-Rails functionality at 3.3V.

How does the shutdown feature work on the MAX997EUA, and what happens to the output during shutdown?

Applying a logic-high signal to the SHDN pin (Pin 8) places the MAX997EUA in shutdown mode, reducing supply current to 270μA per comparator. During shutdown, the output (Pin 7, Q) enters a high-impedance (high-Z) state - neither sourcing nor sinking current - isolating downstream circuitry. Normal operation resumes within 250ns after SHDN is pulled low, with output validity established after that delay.