Analog Devices Inc./Maxim Integrated MAX9691ESA+G077

Overview

MAX9691ESA+G077 from Maxim Integrated is a single-channel, ultra-fast ECL-output comparator with 1.2ns typical propagation delay, ±11.5mV input offset voltage, and dual ±5.2V/+5V supply operation. It features differential inputs, complementary open-emitter outputs compatible with 50Ω-terminated ECL logic, and operates across -40°C to +85°C for high-speed line receivers and threshold detection.

For engineers reviewing the MAX9691ESA+G077 datasheet, MAX9691ESA+G077 pinout, MAX9691ESA+G077 application, or MAX9691ESA+G077 equivalent, this device supports >600MHz signal processing, requires external pull-down resistors on Q/Q̅ outputs, and is optimized for low-skew, low-dispersion timing-critical systems where sub-2ns delay and <100ps skew are essential.

Technical Context

The MAX9691ESA+G077 implements a BiCMOS-based ECL comparator core with matched input transistors ensuring <100ps propagation delay skew and 150ps dispersion over input overdrive variations. Its open-emitter outputs drive 50Ω transmission lines referenced to -2V or -5.2V, requiring external pull-down resistors (50Ω–200Ω to -2V or 240Ω–2000Ω to -5.2V).

GND1 and GND2 are separately routed: GND1 biases the input gain stage, GND2 biases the ECL output stage. The device lacks latch-enable functionality-unlike MAX9692/MAX9693-and its LE pin is not present; unused pins are marked N.C. in the SO-8 package configuration.

Key Specifications

Pinout & Package

MAX9691ESA+G077 is housed in an 8-pin SO (Small Outline) package per outline 21-0041, RoHS-compliant with "+G077" suffix indicating lead-free finish. Pin 1 is VCC; pins 7 and 8 are GND1 and GND2 respectively-separate ground returns critical for input/output stage isolation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-fast ECL-output comparator applications.

Compared with MAX9691ESA+G077, MAX9691EUA+T offers identical performance in a smaller package but reduced power dissipation margin, while ADCMP572BCPZ-R7 eliminates the negative supply at the cost of ECL-100K compatibility and requires layout changes for supply routing.

Availability

MAX9691ESA+G077 is available at Aetrix Electronics and suitable for high-speed line receivers, threshold detectors, peak detectors, and high-speed triggers requiring stable component supply across industrial temperature ranges and long-lifecycle programs.

Supply support for MAX9691ESA+G077 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 computing applications, with emphasis on high-speed, low-noise, and high-reliability solutions.

The MAX9691ESA+G077 belongs to Maxim's ultra-fast comparator product line, engineered specifically for ECL-level signal conditioning in test equipment, optical receivers, and high-frequency instrumentation where sub-2ns timing precision is mandatory.

FAQ

What is the supply voltage requirement for MAX9691ESA+G077?

The MAX9691ESA+G077 requires two supplies: +5V on VCC (Pin 1) and -5.2V on VEE (Pin 4). These rails are mandatory for correct ECL logic-level operation; deviation outside the absolute maximum ratings (VCC: -0.3V to +6V, VEE: -6V to +0.3V) risks permanent damage. Local 0.1µF ceramic decoupling is required at both pins.

Does MAX9691ESA+G077 include a latch-enable function?

No, MAX9691ESA+G077 does not include a latch-enable function. It is the single-comparator variant without LE capability-only MAX9692 and MAX9693 offer latch-enable. The MAX9691ESA+G077 pinout contains no LE pin; all 8 pins are assigned to power, inputs, outputs, and grounds as specified in the SO-8 configuration.

How are the Q OUT and Q OUT outputs configured on MAX9691ESA+G077?

The MAX9691ESA+G077 features complementary open-emitter outputs on Pins 5 (Q OUT) and 6 (Q OUT). These require external pull-down resistors-50Ω to 200Ω tied to -2V, or 240Ω to 2000Ω tied to -5.2V-to establish valid ECL logic levels. No internal termination is provided.

What is the operating temperature range of MAX9691ESA+G077?

The MAX9691ESA+G077 is rated for industrial operation from -40°C to +85°C. This range is guaranteed for all electrical specifications including propagation delay, input offset voltage, and supply current. Junction temperature must not exceed +150°C under continuous operation.

Why are there two ground pins (GND1 and GND2) on MAX9691ESA+G077?

GND1 (Pin 7) and GND2 (Pin 8) serve distinct internal functions: GND1 biases the input differential pair, while GND2 biases the ECL output stage. They must be connected to a common solid copper ground plane-but kept as separate traces until that plane-to prevent output switching noise from modulating input offset and degrading CMRR or delay stability.