Analog Devices Inc./Maxim Integrated MAX997EUA-T

Overview

The MAX997EUA-T 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), ±3.5mV input-referred hysteresis, 5mA supply current per comparator, and Beyond-the-Rails™ input range extending 100mV beyond VCC and GND - used in GPS receivers, high-speed sampling circuits, and threshold detection where fast, clean switching is critical.

For engineers reviewing the MAX997EUA-T datasheet, MAX997EUA-T pinout, MAX997EUA-T application, or MAX997EUA-T equivalent, key selection criteria include propagation delay vs. overdrive, rail-to-rail input capability, shutdown current (270μA), output drive strength (4mA to within 0.52V of rails), and μMAX® package compatibility with space-constrained portable systems.

Technical Context

This device implements a current-driven output stage enabling rapid slew rates while maintaining TTL/CMOS-compatible VOH/VOL (VCC − 0.52V / 0.52V at 4mA). Its internal 3.5mV hysteresis eliminates external feedback resistors and prevents oscillation near trip points.

The comparator supports shutdown mode via SHDN pin, reducing supply current to 270μA per comparator while placing outputs in high-impedance state. Input common-mode range is guaranteed from −0.1V to VCC + 0.1V, and differential input impedance is 8kΩ with 3pF input capacitance.

Key Specifications

Pinout & Package

MAX997EUA-T is housed in an 8-pin μMAX® package (package code U8-1), measuring 3mm × 3mm × 0.8mm with exposed pad for thermal enhancement. The μMAX footprint is compatible with SO-8 layouts but offers ~50% area reduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX961EUA-T, MAX997EUA-T removes latch logic and complementary output to reduce die size, cost, and power - ideal for simple threshold detection. Versus TLV3501CDBVR, it trades external hysteresis flexibility for guaranteed noise immunity and extended input range, simplifying design in GPS and portable systems.

Availability

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

Supply support for MAX997EUA-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, communications, and consumer applications, with emphasis on integration, power efficiency, and reliability.

The MAX961–MAX964/MAX997/MAX999 family was developed specifically for ultra-high-speed, low-power comparator applications in portable and RF-sensitive systems - delivering rail extension, integrated hysteresis, and μMAX packaging for minimal footprint.

FAQ

What is the operating temperature range for the MAX997EUA-T?

The MAX997EUA-T is specified over the −40°C to +85°C industrial temperature range (E grade). This range is guaranteed for all electrical parameters including propagation delay, input offset voltage, and hysteresis. The device is not rated for automotive (−40°C to +125°C) operation - that specification applies only to the MAX999AAUK variant.

Does the MAX997EUA-T require external hysteresis resistors?

No, the MAX997EUA-T includes 3.5mV of internal input-referred hysteresis, eliminating the need for external feedback resistors. This built-in hysteresis ensures clean, oscillation-free switching near trip points and reduces bill-of-materials count and PCB area - a key advantage over comparators like the TLV3501CDBVR which require external hysteresis networks.

How does the shutdown mode affect the output state of the MAX997EUA-T?

When the SHDN pin is driven high, the MAX997EUA-T enters shutdown mode: supply current drops to 270μA per comparator and the Q output enters a high-impedance (high-Z) state. The output remains in high-Z until SHDN is pulled low and the device exits shutdown - no pull-up or pull-down resistors are required to define the output state during shutdown.

Can the MAX997EUA-T operate from a 3.3V supply?

Yes, the MAX997EUA-T operates across a supply range of +2.7V to +5.5V, making it fully compatible with standard 3.3V logic systems. At VCC = 3.3V, output high voltage is guaranteed to be ≥2.78V (3.3V − 0.52V) and output low voltage ≤0.52V when sinking 4mA - ensuring robust TTL/CMOS interfacing without level shifters.

What is the input common-mode voltage range of the MAX997EUA-T?

The MAX997EUA-T features a Beyond-the-Rails™ input common-mode range of −0.1V to VCC + 0.1V. This means either input (IN+ or IN−) can be driven 100mV below GND or 100mV above VCC while maintaining correct comparator functionality - enabling direct interface with AC-coupled sensors, op-amp outputs, or signals referenced outside the supply rails.