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Texas Instruments SN65LVDS122DR
- Part No.:
- SN65LVDS122DR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN65LVDS122DR.pdf
- Description:
- IC CROSSPOINT SW 1 X 2:2 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,733
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Product details
Overview
SN65LVDS122DR from Texas Instruments is a 1.5-Gbps 2×2 LVDS crosspoint switch designed for high-speed signal routing in serial backplanes and optical modules. 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 from –40°C to 85°C on 3.3 V supply.
For engineers reviewing the SN65LVDS122DR datasheet, SN65LVDS122DR pinout, SN65LVDS122DR application, or SN65LVDS122DR equivalent, key selection criteria include differential input threshold hysteresis (25 mV), 0–4 V common-mode input range, 2×2 reconfigurable switching matrix, and SOIC-16 package compatibility with industrial clock distribution systems.
Technical Context
The SN65LVDS122DR implements a fully differential 2×2 crosspoint architecture with two independent differential input pairs (1A/1B, 2A/2B) and two output pairs (1Y/1Z, 2Y/2Z), controlled by dual select lines S0/S1. Internal signal paths preserve LVDS integrity without level translation.
It accepts inputs across 0–4 V common-mode range and delivers outputs with 1.125–1.375 V steady-state common-mode voltage and 247–454 mV differential output magnitude. Enable pins (1DE, 2DE) support per-channel high-impedance control with 4–8 ns enable/disable timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Signaling Rate | Up to 1.5 Gbps - enables OC-48/OC-192 optical module data paths and 622-MHz clock distribution. |
| Propagation Delay | 400–900 ps - ensures sub-nanosecond timing alignment critical for multi-lane synchronization. |
| Total Jitter (pp) | ≤65 ps at 1.5 Gbps PRBS223−1 - meets jitter budget requirements for serial backplane receivers. |
| Input Threshold Hysteresis | 25 mV - improves noise immunity against EMI in high-density PCB environments. |
| Common-Mode Input Range | 0 V to 4 V - allows direct interfacing with LVPECL (≈1.2 V), CML (≈2 V), and LVDS (≈1.2 V) sources without level shifters. |
| Supply Voltage | 3.0–3.6 V - compatible with standard 3.3-V rail and tolerant of ±10% regulation variation. |
| Operating Temperature | –40°C to 85°C - qualified for industrial and telecom infrastructure deployments. |
Pinout & Package
SN65LVDS122DR is housed in a 16-pin SOIC (D) package with 1.27 mm pitch, 10.3 mm × 6.5 mm body, and 1.75 mm max height. Pin 1 is located in quadrant Q1 per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1B, 1A | Differential Input Pair 1 | Accepts LVDS/LVPECL/CML signals; VID ≥100 mV required for valid logic detection. |
| 2B, 2A | Differential Input Pair 2 | Independent second input channel; supports fan-in multiplexing or redundant source selection. |
| 1Y, 1Z | Differential Output Pair 1 | Drives 100-Ω terminated loads; VOD = 247–454 mV into 100 Ω, VOC(SS) = 1.125–1.375 V. |
| 2Y, 2Z | Differential Output Pair 2 | Second independent output; matched skew ≤40 ps relative to 1Y/1Z under identical conditions. |
| S0, S1 | Configuration Select Inputs | Set crosspoint mode (2×2 switch, 2:1 MUX, 1:2 splitter, or dual repeater); TTL/LVTTL-compatible. |
| 1DE, 2DE | Output Enable Controls | Assert low to place corresponding output pair in high-Z state; supports hot-swap and fault isolation. |
| VCC | Power Supply | Single 3.3-V supply; two pins (pins 9 and 10) reduce IR drop and improve PSRR. |
| GND | Ground Reference | Two dedicated ground pins (pins 8 and 16) minimize return-path inductance for high-frequency signals. |
Key Features
| Feature | Design Value |
|---|---|
| Reconfigurable Switch Matrix | 2×2 crosspoint + 2:1 MUX + 1:2 splitter modes via S0/S1 logic - eliminates need for multiple discrete switches in space-constrained designs. |
| Multi-Standard Input Compatibility | 0–4 V common-mode range accepts LVDS, LVPECL, and CML without external biasing - reduces BOM count and layout complexity. |
| Low-Jitter Signal Integrity | 65 ps peak-to-peak jitter at 1.5 Gbps PRBS223−1 - maintains BER <10⁻¹² in OC-192 links over 15-inch FR4 traces. |
| Per-Channel Output Control | Independent 1DE/2DE enables selective output disabling - supports dynamic path reconfiguration and power gating in modular systems. |
| Industrial Temperature Rating | –40°C to 85°C operation - validated for base station RF units, central office equipment, and ruggedized networking hardware. |
Applications
| Optical Module Clock Multiplexing | Serial Backplane Protection Switching |
|---|---|
Use Scenario: Selecting between primary and backup clock sources in 10-G (OC-192) optical line cards with automatic failover. IC Role / Device Role / Timing Role: Dual-input, dual-output LVDS crosspoint switch performing loss-of-signal–triggered clock switchover with <2.6 ns configuration latency. Use Value: Enables hitless clock switching without PLL relock delays, preserving SONET frame alignment and minimizing packet loss during redundancy transitions. | Use Scenario: Isolating faulty lanes in high-speed serial backplanes while maintaining active link continuity. IC Role / Device Role / Timing Role: Reconfigurable 2×2 switch acting as protection element that reroutes traffic around failed transceivers or connectors. Use Value: Achieves sub-microsecond lane bypass using S0/S1 control, eliminating manual jumper changes and enabling automated diagnostics in carrier-grade systems. |
| Wireless Basestation Fanout Buffering | Low-Jitter Clock Repeater/Multiplexer |
Use Scenario: Distributing a single 622-MHz reference clock to multiple RF transceiver ASICs in LTE/5G macro base stations. IC Role / Device Role / Timing Role: 1:2 LVDS splitter mode delivering matched-delay, low-skew copies to four downstream devices. Use Value: Maintains <50 ps part-to-part skew across outputs, ensuring coherent sampling across distributed ADC/DAC arrays and reducing inter-carrier interference. | Use Scenario: Boosting and retiming degraded clock signals traversing long PCB traces or flex cables in test equipment and FPGA prototyping platforms. IC Role / Device Role / Timing Role: Dual repeater mode regenerating LVDS clocks with deterministic jitter removal and amplitude restoration. Use Value: Reduces accumulated jitter by >40% compared to passive routing, extending maximum trace length from 8 inches to 18 inches at 1.5 Gbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LVDS crosspoint switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN65LVDS22DR | Lower 800-Mbps max rate; no S0/S1 reconfiguration - fixed 2×2 switch only. | Lacks multiplexer/splitter modes; unsuitable for dynamic topology changes. | Choose when cost sensitivity outweighs flexibility needs and data rates stay ≤800 Mbps. |
| SN65LVDM22DR | Same pinout and 1.5-Gbps capability but optimized for CML inputs; higher ICC (55 mA vs 100 mA). | Better CML drive strength but reduced LVDS input hysteresis (15 mV vs 25 mV). | Select for mixed-signal systems dominated by CML sources where LVDS noise margin is secondary. |
Compared with SN65LVDS22DR and SN65LVDM22DR, the SN65LVDS122DR uniquely combines full 2×2 reconfigurability, 25-mV input hysteresis for robust LVDS reception, and lowest power consumption (100 mA typical) among TI's 1.5-Gbps LVDS switches - making it optimal for adaptive, multi-standard timing infrastructure.
Availability
SN65LVDS122DR is available at Aetrix Electronics and suitable for optical module clock distribution, wireless basestation timing, and serial backplane protection requiring stable component supply across extended production lifecycles.
Supply support for SN65LVDS122DR 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 50 years of innovation in high-speed interface solutions.
The SN65LVDS122DR belongs to TI's LVDS interface product line, engineered specifically for high-reliability, low-jitter signal routing in telecom infrastructure, optical networking, and mission-critical industrial systems.
FAQ
What is the maximum data rate supported by the SN65LVDS122DR?
The SN65LVDS122DR is characterized for operation up to 1.5 Gbps with 2²³−1 PRBS input patterns and meets jitter specifications (≤65 ps peak-to-peak) at that rate. While some system-level implementations achieve 2 Gbps under favorable loading and signal integrity conditions, TI specifies 1.5 Gbps as the guaranteed performance limit for SN65LVDS122DR across temperature and voltage corners.
Does the SN65LVDS122DR require external termination resistors?
No, the SN65LVDS122DR does not integrate internal termination resistors - unlike the SN65LVDT122 variant. It requires external 100-Ω differential termination at each output (1Y/1Z and 2Y/2Z) to maintain signal integrity. The SN65LVDS122DR datasheet explicitly states "Integrated Termination on SN65LVDT122 Only", confirming termination is absent in SN65LVDS122DR.
Can the SN65LVDS122DR interface directly with LVPECL and CML sources?
Yes, the SN65LVDS122DR accepts LVPECL and CML inputs directly due to its 0–4 V common-mode input voltage range and differential input threshold hysteresis of 25 mV. No level-shifting circuitry is needed - the device internally biases inputs to accommodate typical LVPECL (≈1.2 V) and CML (≈2 V) common-mode voltages while maintaining valid logic detection for VID ≥100 mV.
What are the key timing parameters for configuring the SN65LVDS122DR's switching modes?
The SN65LVDS122DR requires zero setup time (tSET = 0 ns) but 0.5 ns minimum hold time (tHOLD) on S0/S1 select inputs relative to the input data edge. Switching between configurations completes within 1–2.6 ns (tSWITCH), enabling real-time reconfiguration during live data streams without cycle loss - critical for protection switching and dynamic bandwidth allocation in SN65LVDS122DR-based systems.
How does the SN65LVDS122DR handle power-down or output disable scenarios?
When either 1DE or 2DE is driven high, the corresponding output pair (1Y/1Z or 2Y/2Z) enters high-impedance state within 6–8 ns (tPHZ/tPLZ). During full power-down (VCC = 0 V), input leakage remains below ±40 µA, and outputs float safely. This behavior enables hot-swap capability and fault containment in modular architectures using SN65LVDS122DR as a configurable signal gate.
SN65LVDS122DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 65LVDS
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Crosspoint Switch
- Circuit:
- 1 x 2:2
- Independent Circuits:
- 1
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN65LVDS122DR FAQ
1.How can I place an order for SN65LVDS122DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN65LVDS122DR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN65LVDS122DR reliable?
The price and inventory of SN65LVDS122DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN65LVDS122DR is usually 5 days.
3.What payment methods are accepted for SN65LVDS122DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN65LVDS122DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN65LVDS122DR?
SN65LVDS122DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN65LVDS122DR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN65LVDS122DR?
For technical support, including SN65LVDS122DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN65LVDS122DR requirements.
6.How does Aetrix verify that SN65LVDS122DR is sourced from the original manufacturer or authorized distributors?
All SN65LVDS122DR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN65LVDS122DR meets industry standards.
7.What is the process for return or replacement of SN65LVDS122DR?
All SN65LVDS122DR units undergo pre-shipment inspection (PSI). If there is an issue with SN65LVDS122DR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN65LVDS122DR part is unused and in its original packaging.
Return procedure for SN65LVDS122DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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