3.8 GHz fanout buffer for differential clock distribution
The Texas Instruments SN65LVEP11DR is a 1:2 fanout buffer designed for high-speed differential clock and data distribution. It accepts ECL or PECL inputs and delivers two matched ECL/PECL outputs, maintaining signal integrity up to 3.8 GHz. The part operates from a 2.375 V to 3.8 V supply, covering common 2.5 V and 3.3 V logic rails, and is specified across the industrial temperature range of -40°C to 85°C. Typical applications include clock fan-out in telecom switches, data center switches, test equipment, and any serial link requiring low-skew distribution of a high-frequency reference.
Supply range and differential I/O — what they mean for your design
The 2.375 V to 3.8 V supply range lets this buffer run directly from a 2.5 V or 3.3 V rail without an external regulator, simplifying power-tree design. Because both input and output are differential ECL/PECL, the part mates directly to common high-speed clock sources (e.g., LVDS oscillators with AC coupling, or PECL VCXOs) and to downstream ECL/PECL loads such as SerDes reference inputs or FPGA clock pins. The differential path also gives common-mode noise rejection, important when the buffer sits near switching regulators or on a noisy backplane.
Package and footprint
Housed in an 8-pin SOIC package (8-SOIC, 0.154" body width, 3.90 mm), the SN65LVEP11DR uses a standard surface-mount footprint compatible with automated assembly. No exposed pad or thermal via is required at the rated dissipation levels. The -40°C to 85°C operating range covers most industrial and telecom environments.
Lifecycle and sourcing
It is ROHS3 compliant. For dual-sourcing or higher fan-out requirements, the CDCLVP1204RGTR offers a 2:4 LVPECL fanout buffer in a similar supply range, though it uses a different package (QFN) and is not a pin-for-pin drop-in. Sourcing is confirmed through independent distribution; availability and current pricing are quoted against an RFQ.