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/+5V single-supply operation. It features 4.5ns propagation delay (5mV overdrive), ±3.5mV input-referred hysteresis, rail-to-rail beyond-the-rails input range (–0.1V to V_CC+0.1V), and TTL/CMOS-compatible push-pull output capable of sourcing/sinking 4mA within 0.52V of GND or V_CC. It is used in GPS receivers, high-speed sampling circuits, and threshold detection in portable battery-powered systems.

For engineers reviewing the MAX997EUA+T datasheet, MAX997EUA+T pinout, MAX997EUA+T application, or MAX997EUA+T equivalent, key selection considerations include shutdown current (270μA), input offset voltage (±1.5mV typ), propagation delay skew (0.3ns), common-mode rejection ratio (0.3mV/V), and μMAX-8 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX997EUA+T implements a current-driven output stage enabling fast slew rates and low static power after transition, with linear dependence on load capacitance. Its input stage includes dual 200Ω resistors and diode clamps limiting differential input voltage to ≤2.1V, protecting against overvoltage while maintaining 3pF input capacitance and 8kΩ differential input impedance.

It integrates 142 transistors and supports shutdown mode via SHDN pin, reducing supply current to 270μA per comparator while placing outputs in high-impedance state. The device lacks latch-enable functionality (unlike MAX961/MAX963) and complementary outputs (unlike MAX961/MAX962), confirming its role as a single-channel, non-latching, standard-output comparator.

Key Specifications

Pinout & Package

The 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. It is RoHS-compliant and lead(Pb)-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX961EUA+T, MAX997EUA+T removes latch logic to reduce propagation delay variation and simplify timing analysis; compared with TLV3501CDBVR, it delivers guaranteed hysteresis and μMAX-8 thermal performance without layout overhead.

Availability

The MAX997EUA+T is available at Aetrix Electronics and suitable for GPS receivers, portable instrumentation, and high-speed sampling circuits requiring stable component supply across industrial temperature ranges (–40°C to +85°C).

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) is a semiconductor company specializing in precision analog, mixed-signal, and high-speed interface ICs for industrial, communications, and consumer applications.

The MAX997EUA+T belongs to Maxim's ultra-high-speed comparator family designed for low-latency, low-power threshold detection in portable and timing-critical systems - emphasizing rail-to-rail input flexibility and integrated hysteresis.

FAQ

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

The MAX997EUA+T is specified for operation from –40°C to +85°C (E grade). This industrial temperature range is validated across all electrical parameters including propagation delay, input offset voltage, and supply current. The device undergoes 100% production testing at +25°C, with full-range specifications guaranteed by design characterization - ensuring reliability in embedded instrumentation and outdoor GPS equipment where ambient temperatures fluctuate widely.

Does the MAX997EUA+T support rail-to-rail input operation?

Yes, the MAX997EUA+T supports Beyond-the-Rails™ input operation: its input common-mode range extends from –0.1V to V_CC + 0.1V. This allows both IN+ and IN− pins to accept voltages slightly below ground or above V_CC without false output inversion, provided the other input remains within that range. This capability is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables, enabling direct interface with AC-coupled sensors or bipolar signal sources without level-shifting circuitry.

How does the shutdown mode function on the MAX997EUA+T?

The MAX997EUA+T enters shutdown mode when the SHDN pin is driven high (logic 1), reducing supply current per comparator to 270μA and placing the Q output in high-impedance state. SHDN has high input impedance and must be pulled low for normal operation. Exit from shutdown requires SHDN low and latch-enable inactive (not applicable to MAX997EUA+T, which lacks LE). This behavior is verified in the Electrical Characteristics table under "Shutdown Supply Current" and "Shutdown Output Leakage Current" parameters.

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

The MAX997EUA+T uses the 8-pin μMAX® package (package code U8-1), a surface-mount, thermally enhanced variant measuring 3mm × 3mm × 0.8mm with an exposed pad. It is RoHS-compliant and lead(Pb)-free ("+" suffix). Land pattern number 90-0092 applies, and the package supports reflow soldering per JEDEC J-STD-020. Mechanical drawings and footprint data are published by Maxim Integrated under document 21-0036.

Can the MAX997EUA+T drive a 50pF capacitive load without significant delay degradation?

Yes - the MAX997EUA+T maintains 4.5ns typical propagation delay up to at least 50pF load capacitance, as shown in Figure MAX997toc03 (Propagation Delay vs. Capacitive Load). At 50pF and +25°C, delay increases to ~5.2ns (within 0.7ns of nominal), remaining well below 8.5ns maximum across temperature. This is enabled by its current-driven output stage, which sustains high slew rate despite capacitive loading - critical for driving FPGA clock inputs or long PCB traces in high-speed sampling circuits.