Texas Instruments SN65LVDS122D

Overview

SN65LVDS122D from Texas Instruments is a 1.5-Gbps 2×2 LVDS crosspoint switch designed for high-speed signal routing in optical modules, clock distribution, and wireless basestations. It supports LVDS, LVPECL, and CML inputs; features 900 ps max propagation delay, <65 ps peak-to-peak jitter at 1.5 Gbps, and operates over –40°C to 85°C with 3.3 V supply.

For engineers reviewing the SN65LVDS122D datasheet, SN65LVDS122D pinout, SN65LVDS122D application, or SN65LVDS122D equivalent, this page delivers verified electrical specs, SOIC-16 pin mapping, real-world use cases in serial backplane protection and low-jitter clock multiplexing, and validated alternative parts for design continuity.

Technical Context

The SN65LVDS122D implements a fully differential 2×2 crosspoint architecture with two independent enable inputs (1DE, 2DE) and dual select lines (S0, S1) to configure operation as crosspoint switch, 2:1 multiplexer, 1:2 splitter, or dual repeater. Internal signal paths preserve differential integrity to minimize skew and maintain timing accuracy at 1.5 Gbps.

It accepts a wide 0-V to 4-V common-mode input range and provides 25 mV of receiver input threshold hysteresis across that range. Output common-mode voltage is tightly regulated at 1.125–1.375 V, and differential output swing is 247–454 mV into 100 Ω, enabling robust interoperation with industry-standard LVDS receivers.

Key Specifications

Pinout & Package

SN65LVDS122D is housed in a 16-pin SOIC (D) package, 7.5 mm × 10.3 mm body, 1.75 mm height, with 1.27 mm pitch. Pin 1 marked by index area; RoHS-compliant NiPdAu lead finish; MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN65LVDS22D and SN65LVDM22D, the SN65LVDS122D uniquely delivers 1.5-Gbps LVDS crosspoint functionality with integrated hysteresis and wide common-mode tolerance-enabling drop-in replacement in optical and telecom systems where signal integrity at full rate is non-negotiable.

Availability

SN65LVDS122D is available at Aetrix Electronics and suitable for optical module testing, central office clock distribution, and wireless basestation signal routing requiring stable component supply across extended production lifecycles.

Supply support for SN65LVDS122D 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The SN65LVDS122D belongs to TI's high-speed interface portfolio, engineered specifically for low-jitter, pin-configurable LVDS signal routing in telecom infrastructure and optical networking equipment.

FAQ

What is the maximum supported data rate for SN65LVDS122D?

The SN65LVDS122D is characterized for operation up to 1.5 Gbps with 2²³−1 PRBS input pattern and meets jitter specifications (≤65 ps peak-to-peak) at that rate. While some 2-Gbps operation may be possible depending on loading and signal quality, TI specifies 1.5 Gbps as the guaranteed maximum signaling rate per the SLLS525B datasheet.

Does SN65LVDS122D include internal termination resistors?

No, the SN65LVDS122D does not integrate 110-Ω termination resistors. That feature is exclusive to the SN65LVDT122D variant. The SN65LVDS122D requires external 100-Ω differential termination at each output (1Y/1Z and 2Y/2Z) to meet specified VOD and jitter performance.

Can SN65LVDS122D accept LVPECL inputs directly?

Yes, SN65LVDS122D accepts LVPECL inputs directly due to its 0-V to 4-V common-mode input range. When interfacing with LVPECL (e.g., V_TT = V_CC − 2 V), no AC coupling or level-shifting circuitry is needed-verified per Figure 23 and Table 1 in the SLLS525B datasheet.

What is the function of S0 and S1 pins on SN65LVDS122D?

The S0 and S1 pins on SN65LVDS122D configure the internal routing matrix. As defined in the Circuit Function Table, they select between four modes: 2×2 crosspoint (S1S0=00/01), 2:1 multiplexer (S1S0=10), or 1:2 splitter (S1S0=11). These are static CMOS-level control inputs with no timing constraints beyond basic setup/hold.

Is SN65LVDS122D pin-compatible with SN65LVDS22D?

Yes, SN65LVDS122D is pin-compatible with SN65LVDS22D per TI's documentation: both use identical SOIC-16 (D) and TSSOP-16 (PW) packages and share identical pin assignments, power sequencing, and logic-level definitions. However, SN65LVDS122D adds 1.5-Gbps capability and 25-mV hysteresis not present in SN65LVDS22D.