Analog Devices Inc./Maxim Integrated MAX964ESE+

Introduction to the MAX964ESE Quad Comparator Family from Analog Devices/Maxim Integrated

The MAX964ESE is an ultra-high-speed, quad-channel comparator designed by Analog Devices/Maxim Integrated, targeting applications that require fast response and precise voltage detection. Available in a compact 16-SOIC package, the MAX964ESE integrates four independent comparator elements, making it particularly suitable for applications such as high-speed signal detection, threshold detection, and portable/battery-operated device systems. With support for “Beyond-the-Rails” input voltage range and CMOS/TTL logic-compatible outputs, the device ensures versatile interfacing for modern digital and analog circuit designs.

Primary Attributes and Advantages of MAX964ESE Comparators

The MAX964ESE is engineered to deliver a blend of speed, accuracy, and ease of integration:

Ultra-fast 4.5ns propagation delay (typical, 5mV overdrive), enabling real-time signal monitoring even in high-frequency domains.

Guaranteed “Beyond-the-Rails” input range (extends 100mV beyond either supply rail), allowing flexible input signal handling without external clamping.

Internal hysteresis (1.5mV typical at 5V) ensures clean switching, minimizing false or oscillating outputs near the switching threshold—a critical advantage for high-noise or high-speed applications.

CMOS and TTL logic compatibility for direct connection with standard logic families, reducing system complexity.

Ultra-low supply current: 9mA maximum quiescent consumption for all four amplifiers, with an optional shutdown mode (270μA per channel) to minimize power when idle.

Wide supply voltage operation: single +2.7V to +5.5V rail, suitable for both 3V and 5V systems.

Robust output stage: capable of sourcing/sinking 4mA and achieving near-rail-to-rail output swing (within 0.52V of supply rails).

Operating temperature range: -40°C to +85°C, supporting industrial and commercial environments.

RoHS and REACH compliant for modern environmental and regulatory requirements.

In-depth Electrical Specifications of MAX964ESE

Engineers evaluating the MAX964ESE should carefully consider its core electrical parameters, which directly impact integration and performance:

Input offset voltage: 1.5mV maximum at 5V, ensuring accurate threshold comparison and reduced calibration needs.

Input bias current: 15μA maximum at 5V, limiting loading on precision sources.

Input common-mode range: from -0.1V to Vcc+0.1V, supporting detection of signals both slightly above and slightly below the rails.

Output characteristics: Output high and low voltages typically within 0.52V of the positive and ground rails, respectively, when loaded with 4mA.

High immunity to supply and common-mode variations: 80dB CMRR (Common-Mode Rejection Ratio) and 86dB PSRR (Power Supply Rejection Ratio) typical values.

Supply current: 6–9mA (typical, all four comparators active), with each comparator independently contributing to the total; shutdown functionality reduces consumption to the μA range.

Propagation delay variation across temperature and load is minimal, lending the MAX964ESE suitability in applications with tight timing margins.

Functional Schematic and Pin Layout of MAX964ESE

The MAX964ESE accommodates four individual comparators within a single package, each possessing separate inverting (IN-) and non-inverting (IN+) inputs and TTL-compatible outputs. The key pin functions include:

Dedicated shutdown (SHDN) pin: Device power can be reduced on command.

Each comparator features an output accessible at a distinct pin, allowing parallel or independent signal monitoring architectures.

The device uses a standard 16-SOIC surface-mount package, with a pinout optimized for typical quad-comparator use-cases.

Internal protective structures (input clamp diodes and resistors) protect against inadvertent overvoltage conditions, helping prevent damage and simplify external protection requirements.

The MAX964ESE does not require external resistors for hysteresis implementation, as the function is built-in for all channels.

Design Guidelines and Application Notes for MAX964ESE

The MAX964ESE is optimized for use in high-speed analog-to-digital interfacing, signal threshold detection, zero-crossing detection, and pulse timing or quantization circuits. Design engineers benefit from the comparator's rapid response time, consistent delay characteristics, and reduced susceptibility to common-mode noise. Example application scenarios include:

High-speed signal sampling or pulse-height discrimination in instrumentation and communication receivers.

GPS and portable electronics, where power draw and input voltage flexibility are crucial.

Line receivers and zero-crossing detectors, benefiting from the rail-to-rail input capability and clean output transitions.

Systems where shutdown and power management are essential, leveraging the part's low standby current mode to extend battery life.

Key considerations when integrating the MAX964ESE include maintaining input signal voltages within the specified "Beyond-the-Rails" range, providing adequate PCB layout for high-speed signal and power integrity, and ensuring appropriate output loading when driving digital logic circuits.

Alternative or Substitute Models for MAX964ESE

Given the product status of MAX964ESE as obsolete, engineers and procurement personnel should consider functionally and electrically similar replacement solutions. Notable alternatives within or outside the Analog Devices/Maxim Integrated portfolio include:

MAX964EEE: A QSOP package version providing the same core performance and features.

MAX963 and MAX997 families: Single, dual, and quad comparators from the same high-speed, low-power family, varying in number of channels and package type but offering internal hysteresis and CMOS/TTL output.

Other industry equivalents: For footprints or electrical specifications not met by Analog Devices/Maxim Integrated products, comparators such as the Texas Instruments LMV7219, ON Semiconductor NC7WZ17, or comparable ultra-high-speed, low-power rail-to-rail input comparators may be considered.

When evaluating replacement options:

Confirm supply, offset, hysteresis, and propagation delay specifications to match system requirements.

Review package pinout for direct PCB replacement or necessary board modifications.

Consider availability and long-term supply commitments.

Conclusion

The MAX964ESE quad comparator from Analog Devices/Maxim Integrated stood as a benchmark for high-speed, low-power, rail-to-rail input voltage comparison. Its rapid propagation delay, robust output stage, internal precision hysteresis, and power-conscious shutdown functionality made it a favored choice for timing-critical and power-sensitive designs. While now obsolete, a thorough understanding of the MAX964ESE’s characteristics enables engineers and sourcing professionals to make informed decisions regarding direct replacement or redesign, ensuring continuity and reliability in ongoing and future designs.