NB7VQ14MMNTXG

Clock Buffers, Drivers Overview

The NB7VQ14MMNTXG is a high-performance differential 1:4 CML fanout buffer from onsemi's GigaComm family. It operates with supply voltages of 1.8 V, 2.5 V, or 3.3 V and supports input clock frequencies up to 8.5 GHz and data rates up to 14 Gbps. The device features a selectable input equalizer to compensate for signal degradation in FR4 backplanes or cables. Key electrical parameters include a typical propagation delay of 165 ps, maximum output skew of 15 ps, and RMS clock jitter below 0.8 ps. It incorporates internal 50 Ω input termination resistors accessed via the VT pin, allowing compatibility with LVPECL, CML, and LVDS logic standards.

Clock Buffers, Drivers Feature Summary

• Selectable Input Equalizer: EQEN pin controls bypass or flow-through of the equalizer section to reduce Inter-Symbol Interference (ISI).
• Multi-Level Inputs: Accepts LVPECL, CML, or LVDS signals via internal 50 Ω center-tapped termination resistors at the VT pin.
• Low Jitter Performance: Maximum RMS clock jitter is less than 0.8 ps; peak-to-peak data-dependent jitter is less than 10 ps.
• High-Speed Operation: Supports typical input data rates >14 Gb/s and clock frequencies >8 GHz.

Clock Buffers, Drivers Applications

• SONET/SDH Clock Distribution
• Gigabit Ethernet (GigE) Systems
• Fiber Channel Networks
• Backplane Clock/Data Distribution

Clock Buffers, Drivers Procurement Notes

Verify the specific ordering suffix against the manufacturer's documentation to confirm packaging type. The NB7VQ14MMNTXG designation corresponds to the QFN-16 package. Confirm availability status as distribution channels may list varying stock levels or end-of-life statuses. Ensure the procurement source provides valid traceability for RoHS compliance and Pb-free certification as specified in the datasheet attributes.

Clock Buffers, Drivers Selection Notes

Select this component when low output skew (<15 ps) and minimal jitter are critical for high-speed serial data integrity. The integrated equalizer is suitable for applications requiring signal regeneration across lossy interconnects like long FR4 traces. Ensure the design accommodates the required power supply range (1.71 V to 3.6 V) and thermal management for the QFN-16 package, specifically connecting the exposed pad to ground for heat dissipation.

Clock Buffers, Drivers Part Context

This part belongs to the NB7VQ14M series within onsemi's GigaComm portfolio of high-performance clock products. It serves as a fanout buffer designed to drive multiple loads while maintaining signal quality. The MMNHTBG suffix indicates a tape and reel shipping configuration, distinct from tube packaging options available for other variants in the same functional family.

Clock Buffers, Drivers Replacement Considerations

Direct replacements must match the 1:4 CML fanout topology, QFN-16 package, and comparable speed/jitter specifications. Verify that any substitute device supports the same multi-level input standards (LVPECL/CML/LVDS) and has compatible pinouts for the VT and EQEN control functions without requiring schematic modifications.

Clock Buffers, Drivers FAQ

How is the input equalizer function controlled?

The equalizer is controlled by the EQEN pin. Setting EQEN Low bypasses the equalizer, while setting it High allows inputs to flow through the equalizer section. The default state at start-up is Low due to an internal pull-down resistor.

What logic standards are supported by the differential inputs?

The NB7VQ14M accepts LVPECL, CML, and LVDS logic level standards. This is achieved through internal 50 Ω termination resistors accessed via the VT pin, which can be tied to appropriate voltage references or left open depending on the standard.

What is the maximum operating temperature range?

The device is rated for an ambient operating temperature range of -40°C to +85°C.