Texas Instruments SN65LVDS34DR

Overview

SN65LVDS34DR from Texas Instruments is a dual-channel LVDS line receiver in SOIC-8 package, operating from a single 3.3-V supply with ±4 V to 5 V common-mode input voltage range, 400-Mbps signaling rate, and integrated active failsafe circuitry. It is used in high-speed point-to-point data links such as industrial backplanes, test equipment interfaces, and FPGA-to-FPGA communication.

For engineers reviewing the SN65LVDS34DR datasheet, SN65LVDS34DR pinout, SN65LVDS34DR application, or SN65LVDS34DR equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, and two confirmed alternative parts for system-level timing and signal integrity planning.

Technical Context

The SN65LVDS34DR implements a wide common-mode input stage compatible with both LVDS and 5-V PECL signals, enabling direct interface without external level-shifting networks. Its differential input threshold remains within ±50 mV across –4 V to 5 V common-mode range, with 50 mV hysteresis for noise immunity on slow edges.

It features an active failsafe circuit that asserts high-level output within 600 ns upon loss of valid differential input (e.g., open or shorted lines), eliminating need for external pull-ups. The device supports TTL-compatible enable inputs and maintains high-impedance inputs during power-down.

Key Specifications

Pinout & Package

SN65LVDS34DR is housed in an 8-pin SOIC (D) package with 1.27-mm pitch, JEDEC MS-012AC compliant, RoHS-compliant NiPdAu lead finish, and MSL Level-1 rating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LVDS receiver applications.

Compared with SN65LVDT34DR, SN65LVDS34DR offers greater flexibility in termination topology, while SN65LVDS32BDR trades channel count and enable control for lower unit cost-making SN65LVDS34DR optimal for dual-channel, enable-controlled, externally terminated LVDS links.

Availability

SN65LVDS34DR is available at Aetrix Electronics and suitable for industrial backplanes, FPGA interconnects, and automated test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SN65LVDS34DR 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 connectivity technologies with over 90 years of innovation in high-reliability signal conditioning ICs.

The SN65LVDS34DR belongs to TI's LVDS receiver family designed for robust, high-speed baseband data transmission over controlled-impedance media-including PCB traces, backplanes, and shielded cables-in industrial, medical, and test equipment.

FAQ

What is the maximum signaling rate supported by SN65LVDS34DR?

The SN65LVDS34DR supports a maximum signaling rate of 400 Mbps, defined as the number of voltage transitions per second on the differential input pair. This performance is guaranteed across the full operating temperature range (–40°C to 85°C) and supply voltage (3.0 V to 3.6 V), with typical propagation delay of 4 ns and sub-200-ps pulse skew enabling reliable NRZ data recovery at 200 MHz DDR rates. The SN65LVDS34DR achieves this using optimized internal comparator architecture and low-capacitance input stages.

Does SN65LVDS34DR include internal termination resistors?

No, SN65LVDS34DR does not include internal 110-Ω termination resistors. It is the non-terminated variant in the SN65LVDSxx family. Termination must be implemented externally-typically as a 100-Ω resistor across the differential pair at the receiver end of the transmission line. For integrated termination, TI offers the pin-compatible SN65LVDT34DR, which embeds matched 110-Ω resistors and shares identical timing, failsafe, and common-mode specifications with SN65LVDS34DR.

How does the active failsafe feature work in SN65LVDS34DR?

The active failsafe in SN65LVDS34DR uses a window comparator monitoring the differential input voltage (VID). When VID drops below –32 mV for >1.5 µs-indicating cable disconnect, short, or powered-down transmitter-the failsafe logic drives both outputs high within 600 ns. This prevents noise from being misinterpreted as valid data and supports wired-OR bus architectures. The feature operates independently of the enable (G) pin and remains functional across the full –4 V to 5 V common-mode range.

Can SN65LVDS34DR interface directly with 5-V PECL signals?

Yes, SN65LVDS34DR can interface directly with 5-V PECL drivers without external level-shifting components. Its –4 V to 5 V common-mode input voltage range accommodates the PECL common-mode offset (~VCC – 1.3 V ≈ 3.7 V), and its differential input threshold remains stable across this range. No resistor divider network is required-unlike standard LVDS receivers-making SN65LVDS34DR ideal for mixed-signal systems integrating legacy PECL clocks or data with modern LVDS interfaces.

What is the recommended power supply decoupling for SN65LVDS34DR?

Texas Instruments specifies a 0.1-µF ceramic capacitor (Z5U, X7R, or NP0 dielectric, 0805 size) placed between VCC and GND, located as close as possible to pins 8 (VCC) and 4 (GND) of the SN65LVDS34DR SOIC-8 package. This minimizes high-frequency supply noise coupling into the sensitive differential input stage. Additional bulk capacitance (e.g., 4.7 µF tantalum) may be added nearby for systems with dynamic current draw, but the 0.1-µF local cap is mandatory for stable 400-Mbps operation per TI SLLS490B datasheet Section 12.