Texas Instruments SN65LVDS20DRFT

Overview

SN65LVDS20DRFT from Texas Instruments is a high-speed LVPECL-to-LVDS repeater/translator IC designed for signal integrity-critical backplane, FPGA interconnect, and serial link applications. It operates from 2.5-V or 3.3-V supply, supports signaling rates up to 4 Gbps, delivers <45 ps total jitter, and features differential LVDS outputs compliant with TIA/EIA-644-A.

For engineers reviewing the SN65LVDS20DRFT datasheet, SN65LVDS20DRFT pinout, SN65LVDS20DRFT application, or SN65LVDS20DRFT equivalent, key selection criteria include its 4-Gbps data rate capability, sub-630-ps propagation delay, 2-mm × 2-mm WSON-8 package, enable-controlled high-impedance output state, and VBB reference for single-ended PECL input termination.

Technical Context

The SN65LVDS20DRFT integrates a differential LVPECL receiver followed by an LVDS driver in a single repeater path, maintaining signal fidelity across high-speed serial links. Its architecture includes internal VBB reference generation (typically VCC − 1.35 V), enabling direct connection to single-ended PECL sources without external biasing networks.

Signal conditioning is achieved via matched differential paths with <80 ps pulse skew and 20%–80% rise/fall times of 85–115 ps (LVDS mode). The EN pin controls output enable/disable with 30-ns transition timing, and both Y/Z outputs are optimized for 100-Ω differential transmission lines.

Key Specifications

Pinout & Package

SN65LVDS20DRFT is housed in an 8-pin WSON (DRF) package measuring 2 mm × 2 mm with 0.5-mm pitch and wettable flanks. The package is RoHS-compliant, moisture-sensitivity Level-1 rated, and suitable for reflow soldering at 260°C peak.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LVPECL-to-LVDS translation applications.

Compared with SN65LVP20DRFT and MAX9122EUA+, the SN65LVDS20DRFT uniquely combines 4-Gbps LVDS output compliance, integrated VBB reference, and WSON-8 packaging-making it the only option among the three qualified for high-density, high-speed telecom and FPGA timing applications requiring TIA/EIA-644-A conformance.

Availability

SN65LVDS20DRFT is available at Aetrix Electronics and suitable for high-speed FPGA interconnect, optical transceiver timing interface, and backplane signal regeneration requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN65LVDS20DRFT 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-performance signal chain technologies, with over 90 years of innovation in industrial, automotive, and communications markets.

The SN65LVDS20DRFT belongs to TI's high-speed interface portfolio, engineered specifically for low-jitter, high-fidelity signal translation in next-generation serial data infrastructure where timing precision and signal integrity are non-negotiable.

FAQ

What is the maximum supported data rate for SN65LVDS20DRFT?

The SN65LVDS20DRFT supports signaling rates up to 4 Gbps, validated using PRBS23 patterns at 4 Gbps with measured peak-to-peak jitter under 45 ps. This performance is guaranteed across the full operating temperature range (−40°C to +85°C) and supply voltages of 2.5 V or 3.3 V. The device maintains this rate with differential loads of 90 Ω to 132 Ω, aligning with standard PCB trace impedances.

Does SN65LVDS20DRFT require external termination resistors for LVDS outputs?

Yes, SN65LVDS20DRFT requires external 100-Ω differential termination across Y and Z outputs to match standard LVDS load impedance. The device itself does not integrate termination; the recommended load resistance is 90 Ω to 132 Ω per TIA/EIA-644-A. Proper termination ensures optimal signal integrity, minimizes reflections, and maintains the specified 247–454 mV differential output voltage swing.

Can SN65LVDS20DRFT accept single-ended LVPECL inputs?

Yes, SN65LVDS20DRFT can interface with single-ended LVPECL sources using its integrated VBB pin, which provides a stable reference voltage of VCC − 1.35 V (typ). When connecting a single-ended source, tie the unused input (A or B) to VBB, and drive the active input with the LVPECL signal. This configuration avoids external bias networks and maintains common-mode compatibility.

What is the function of the EN pin on SN65LVDS20DRFT?

The EN pin on SN65LVDS20DRFT is an active-low enable control: when pulled low (≤0.8 V), the Y and Z outputs actively drive LVDS signals; when pulled high (≥2 V), both outputs enter a high-impedance state. Propagation delays for enable/disable transitions are ≤30 ns, enabling fast bus arbitration and power-gated operation. The EN pin has ±20 µA leakage current, allowing direct MCU GPIO control without buffering.

Is SN65LVDS20DRFT pin-compatible with SN65LVP20DRFT?

Yes, SN65LVDS20DRFT and SN65LVP20DRFT share identical pinout, package (WSON-8 DRF), and enable functionality-but differ exclusively in output standard: SN65LVDS20DRFT outputs LVDS, while SN65LVP20DRFT outputs LVPECL. They are not electrically interchangeable in the same circuit without verifying downstream input compatibility, though PCB layout and thermal design may be reused.