Analog Devices Inc./Maxim Integrated MAX9691EUA-T

Overview

The MAX9691EUA-T from Maxim Integrated is a single-channel, ultra-fast ECL-output comparator with no latch-enable function, housed in an 8-pin µMAX package. It delivers 1.2ns typical propagation delay, 100ps skew, and 150ps dispersion at +5V/–5.2V supplies, enabling high-speed line reception and threshold detection in >600MHz signal paths.

For engineers reviewing the MAX9691EUA-T datasheet, MAX9691EUA-T pinout, MAX9691EUA-T application, or MAX9691EUA-T equivalent, this device is selected for precision timing-critical comparisons where sub-2ns delay, ECL-level compatibility, open-emitter output drive into 50Ω loads, and DC matching under high-speed operation are required.

Technical Context

The MAX9691EUA-T implements a BiCMOS differential input stage with ECL-compatible complementary open-emitter outputs, requiring external pull-down resistors (50Ω–200Ω to –2.0V or 240Ω–2000Ω to –5.2V). Its design maintains <±11.5mV input offset voltage over –40°C to +85°C while achieving 70dB open-loop gain and 60kΩ differential input resistance.

Unlike the MAX9692/MAX9693, the MAX9691EUA-T omits latch-enable circuitry-its LE pin is absent-and thus operates strictly as a transparent comparator. Input common-mode range spans –2.5V to +3.0V, with CMRR of 60–80dB and ±60dB PSRR on both supply rails.

Key Specifications

Pinout & Package

The MAX9691EUA-T is packaged in an 8-pin µMAX (U8+1) surface-mount package, 3mm × 3mm, 0.8mm height, RoHS-compliant, with exposed pad for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX9692EUB and ADCMP572BCPZ-R7, the MAX9691EUA-T provides the lowest pin count, highest ECL compatibility, and best DC matching for pure high-speed comparison without latching-making it ideal for space-constrained, ECL-native designs demanding minimal latency and maximum timing fidelity.

Availability

MAX9691EUA-T is available at Aetrix Electronics and suitable for high-speed line receivers, threshold detectors, and peak detectors requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MAX9691EUA-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 high-performance analog, mixed-signal, and RF ICs for precision, speed, and power efficiency.

The MAX9691EUA-T belongs to Maxim's ultra-fast comparator product line, engineered specifically for ECL-based instrumentation, communications, and test equipment where sub-2ns timing resolution and robust DC accuracy are mandatory.

FAQ

What is the supply voltage requirement for the MAX9691EUA-T?

The MAX9691EUA-T requires dual supplies: +5V on VCC and –5.2V on VEE. These voltages establish the ECL-compatible output swing and internal biasing. Operation outside the absolute maximum ratings (–0.3V to +6V on VCC; –6V to +0.3V on VEE) risks permanent damage. Local 0.1µF ceramic decoupling capacitors must be placed directly at each supply pin.

Does the MAX9691EUA-T have a latch-enable function?

No, the MAX9691EUA-T does not include a latch-enable function. Unlike the MAX9692/MAX9693 variants, the MAX9691EUA-T is a single-channel comparator with no LE pin. Its pinout contains only VCC, IN+, IN–, VEE, Q OUT, Q OUT, GND1, and GND2. Latch capability is exclusive to the MAX9692 and MAX9693 families.

How should the open-emitter outputs of the MAX9691EUA-T be terminated?

The MAX9691EUA-T's Q OUT and Q OUT pins are open-emitter outputs and require external pull-down resistors. For –2.0V termination, use 50Ω–200Ω resistors; for –5.2V termination, use 240Ω–2000Ω resistors. Proper termination ensures correct ECL logic levels (≈–0.9V for high, ≈–1.7V for low) and impedance-matched 50Ω transmission-line driving.

What is the operating temperature range of the MAX9691EUA-T?

The MAX9691EUA-T is rated for operation from –40°C to +85°C. This industrial temperature range is guaranteed by design and validated across all key parameters including propagation delay, input offset voltage (±11.5mV max), and supply current (34–46mA). The 8-pin µMAX package supports thermal dissipation up to 387.8mW at +70°C with appropriate derating.

Can the MAX9691EUA-T drive 50Ω transmission lines directly?

Yes, the MAX9691EUA-T is designed to drive 50Ω-terminated transmission lines. Its open-emitter outputs, when paired with correctly sized external pull-down resistors (e.g., 50Ω to –2.0V), deliver ECL-compatible logic levels with sufficient current (up to 50mA per output) and bandwidth to sustain signal integrity beyond 600MHz. Layout must follow microstrip guidelines with ground plane and local decoupling.