Analog Devices Inc./Maxim Integrated MAX9311EGJ

Overview

MAX9311EGJ from Maxim Integrated is a low-skew, 1-to-10 differential LVPECL/LVECL/HSTL clock and data driver with dual differential inputs (CLK0/CLK0, CLK1/CLK1), selectable via single-ended CLKSEL, and ten matched differential outputs (Q0–Q9). It delivers 312ps typical propagation delay, 12ps output-to-output skew, and ≥300mV differential output amplitude at 3GHz - enabling precise timing distribution in high-speed backplane and board-level systems.

For engineers reviewing the MAX9311EGJ datasheet, MAX9311EGJ pinout, MAX9311EGJ application, or MAX9311EGJ equivalent, key selection criteria include its +2.25V to +3.8V supply range for LVPECL/HSTL operation, on-chip VBB reference (1.425V below VCC), 32-pin 5mm × 5mm QFN package, and compatibility with differential signal integrity requirements up to 3GHz.

Technical Context

The MAX9311EGJ integrates a 2:1 multiplexer selecting between two differential clock inputs using a single-ended CLKSEL control referenced to its internal VBB voltage (VCC − 1.425V). Its input stage supports both true differential operation and single-ended adaptation via VBB connection, with bias resistors (75kΩ pullup/pulldown) ensuring defined output state during open inputs.

Output drivers are optimized for LVPECL (VCC = positive, VEE = GND) or LVECL (VCC = GND, VEE = negative) signaling, delivering differential swing ≥670mV (typ) into 50Ω loads terminated to VCC − 2V. AC performance includes 30ps typical part-to-part skew and added random jitter of 1.2–2.6ps RMS at 1.5–3.0GHz.

Key Specifications

Pinout & Package

MAX9311EGJ is housed in a 32-pin, 5mm × 5mm, 0.9mm-thick QFN package with exposed thermal pad (G3255-1 drawing), optimized for high-density PCB layouts and thermal performance in compact systems.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar differential clock driver applications.

Compared with MC100LVEP111 and MAX9313EGJ, the MAX9311EGJ offers the highest VBB offset (VCC − 1.425V), enabling superior common-mode rejection in single-ended input configurations above 3.0V supply, while retaining full pin compatibility with the LVEP111 footprint for seamless migration.

Availability

MAX9311EGJ is available at Aetrix Electronics and suitable for precision clock distribution, low-jitter data repeater, and backplane timing hub applications requiring stable component supply, consistent parametric performance across temperature, and long-term industrial lifecycle support.

Supply support for MAX9311EGJ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.

The MAX9311EGJ belongs to Maxim's high-speed clock distribution product line, engineered specifically for sub-30ps skew and GHz-range signal integrity in mission-critical timing infrastructure.

FAQ

What supply voltage range does the MAX9311EGJ support for LVPECL operation?

The MAX9311EGJ supports LVPECL operation from +2.25V to +3.8V (VCC − VEE), making it compatible with standard +2.5V and +3.3V system supplies. At VCC = +3.3V and VEE = GND, it delivers LVPECL-compliant output levels (VOH ≈ VCC − 1.0V, VOL ≈ VCC − 1.8V) into 50Ω loads terminated to VCC − 2V. This range is confirmed in the Absolute Maximum Ratings and DC Electrical Characteristics tables of the official datasheet.

How does the MAX9311EGJ handle single-ended input signals?

The MAX9311EGJ accepts single-ended inputs by connecting its on-chip VBB reference (VCC − 1.425V) to one side of a differential input pair - for example, tying VBB to CLK0 and driving the signal to CLK0 creates a noninverting single-ended input. This configuration is valid only when VCC − VEE is between +3.0V and +3.8V. The MAX9311EGJ's internal bias resistors ensure predictable behavior, and the VBB output can source/sink ±0.5mA to support two such conversions.

Is the MAX9311EGJ pin-compatible with other industry-standard clock drivers?

Yes, the MAX9311EGJ is pin-compatible with the MC100LVEP111 in identical 32-pin QFN, TQFP, and LQFP packages. All signal, power, and ground pin assignments match exactly, allowing direct PCB replacement without layout changes. However, the MAX9311EGJ's VBB voltage (VCC − 1.425V) differs from the LVEP111's (VCC − 1.3V), which may affect single-ended input noise margin in some designs.

What is the maximum operating frequency supported by the MAX9311EGJ?

The MAX9311EGJ supports a maximum switching frequency of 3.0GHz when the differential output amplitude is ≥350mV, and 1.5GHz when amplitude is ≥500mV - both measured under standard load conditions (50Ω to VCC − 2V). These values are specified in the AC Electrical Characteristics table and validated across −40°C to +85°C. Real-world performance at 3GHz depends on proper termination, trace impedance control, and supply decoupling.

Does the MAX9311EGJ require external termination resistors?

Yes, the MAX9311EGJ requires external 50Ω termination resistors from each differential output (e.g., Q0 and Q0) to VCC − 2V for proper LVPECL operation. This termination establishes the correct common-mode voltage and differential swing. When extracting a single-ended signal from a differential pair (e.g., using only Q0), both Q0 and Q0 must still be terminated to maintain impedance balance and prevent reflections that degrade edge fidelity and increase jitter.