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Texas Instruments SN65LVDT250DBT
- Part No.:
- SN65LVDT250DBT
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN65LVDT250DBT.pdf
- Description:
- IC CROSSPOINT SW 1 X 4:4 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:549
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Product details
Overview
SN65LVDT250DBT from Texas Instruments is a 4×4 nonblocking LVDS crosspoint switch with integrated 110-Ω termination resistors, designed for high-speed signal routing in telecom and datacom systems. It supports >2.0 Gbps operation, delivers 800 ps typical propagation delay, and operates from a single 3.3-V supply with 110 mA typical supply current.
For engineers reviewing the SN65LVDT250DBT datasheet, SN65LVDT250DBT pinout, SN65LVDT250DBT application, or SN65LVDT250DBT equivalent, this device is selected for low-jitter, flow-through-layout-compatible differential switching where board space constraints favor on-die termination over external resistors.
Technical Context
The SN65LVDT250DBT implements a fully differential 4×4 crosspoint architecture with four independent 4:1 multiplexers - one per output channel (1Y/1Z through 4Y/4Z) - enabling any input pair (1A/1B to 4A/4B) to be routed to any output under control of S10/S11 through S40/S41 select lines. Each output driver includes internal 110-Ω termination to ground, eliminating need for external resistors on the PCB.
It accepts LVDS, LVPECL, and CML input levels, features 25 mV input hysteresis, and maintains <175 ps channel-to-channel output skew across -40°C to 85°C. The device uses flow-through pinout (inputs on left/right, outputs on bottom/top) to simplify high-speed layout and minimize trace length mismatch.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 4×4 nonblocking LVDS crosspoint switch with integrated 110-Ω termination |
| Max data rate | >2.0 Gbps - enables PRBS2^23−1 compliant serial links at 2.0–2.5 Gbps |
| Propagation delay | 700–1200 ps - ensures sub-nanosecond timing alignment across all channels |
| Jitter (pk-pk) | 60–110 ps at 2.0 Gbps - meets stringent eye-opening requirements for telecom backplanes |
| Supply voltage | 3.0–3.6 V - compatible with standard 3.3-V logic rails and low-noise power domains |
| Operating temperature | -40°C to +85°C - qualified for industrial and base station environments |
| Input compatibility | LVDS / LVPECL / CML - eliminates level-shifting circuitry in mixed-signal interconnects |
Pinout & Package
SN65LVDT250DBT is housed in a 38-pin TSSOP (DBT) package with 0.5-mm pitch and 1.2-mm max height, optimized for compact PCB layouts and automated assembly. Pin numbering follows JEDEC MO-153 standard with Pin 1 located in Quadrant Q1 per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 1B – 4A, 4B | Differential input pairs | Four LVDS/LVPECL/CML input channels; electrically compatible with multiple signaling standards |
| 1Y, 1Z – 4Y, 4Z | Differential output pairs | Four terminated LVDS outputs; each includes internal 110-Ω resistor to GND |
| S10, S11 – S40, S41 | Channel select inputs | Two-bit binary control per output (e.g., S10/S11 selects source for 1Y/1Z) |
| 1DE – 4DE | Output enable/disable | Individual 3-state control per output channel; high = enabled, low = high-Z |
| VCC, GND | Power and ground | Single 3.3-V supply; multiple VCC/GND pins reduce noise coupling and improve PSRR |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 110-Ω termination | Eliminates 8 external resistors per device, saving >12 mm² PCB area and reducing BOM count |
| Flow-through pinout | Enables straight-through routing with minimal layer transitions and controlled impedance continuity |
| 25 mV input hysteresis | Improves noise immunity on select and enable lines in electrically noisy telecom chassis environments |
| Low channel skew | <175 ps max output skew ensures deterministic timing across all 4 switched paths |
| Multi-standard input support | Accepts LVDS, LVPECL, and CML without external biasing or level translation |
Applications
| Wireless Base Station Backhaul | High-Speed Network Router Fabric |
|---|---|
|
Use Scenario: Routing multiple 2.5-Gbps CPRI or OBSAI links between RF modules and baseband processors in macrocell BTS. IC Role / Device Role / Timing Role: Signal path selector enabling dynamic reconfiguration of fronthaul interfaces without physical rewiring. Use Value: Integrated termination reduces stub reflections and preserves eye opening at 2.5 Gbps over FR4 backplanes. |
Use Scenario: Interconnecting line cards and switch fabric ASICs in modular Layer 3 routers supporting 10G Ethernet and OTN. IC Role / Device Role / Timing Role: Low-skew, high-bandwidth crosspoint for clock and data lane aggregation/distribution. Use Value: Sub-nanosecond propagation delay and <175 ps skew maintain timing closure across multi-lane SerDes interfaces. |
| Telecom Line Card Signal Multiplexing | Data Center Optical Module Interface |
|
Use Scenario: Consolidating multiple SONET/SDH or SyncE clock distribution paths onto shared backplane traces in central office equipment. IC Role / Device Role / Timing Role: Clock muxing and signal switching element supporting hitless switchover between primary/backup timing sources. Use Value: 60–110 ps peak-to-peak jitter at 2.0 Gbps ensures meeting ITU-T G.823/G.8262 wander and jitter masks. |
Use Scenario: Adapting variable-lane-width optical transceiver modules (e.g., QSFP28) to fixed-lane switch ASICs in top-of-rack switches. IC Role / Device Role / Timing Role: Lane remapping and protocol-agnostic differential signal router between pluggable optics and host PHY. Use Value: Flow-through pinout and LVPECL/CML compatibility allow direct connection to both optical module drivers and switch die I/O. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LVDS crosspoint switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN65LVDS250DBT | No integrated termination; requires external 110-Ω resistors per output | Better suited when board layout allows discrete termination or when termination value must be tuned | Select SN65LVDS250DBT if external termination provides needed flexibility or lower thermal load |
| MAX9154ESE+ | 3.3-V only, 2.5-Gbps rated, no integrated termination, different pinout and control interface | Used in legacy industrial systems with existing MAXIM-based designs and simpler enable-only control | Choose MAX9154ESE+ only when replacing existing MAXIM-based boards and layout revision is impractical |
Compared with SN65LVDS250DBT, the SN65LVDT250DBT saves PCB area and improves signal integrity via on-die termination, while MAX9154ESE+ offers drop-in replacement in legacy MAXIM designs but lacks flow-through layout support and integrated termination.
Availability
SN65LVDT250DBT is available at Aetrix Electronics and suitable for wireless base stations, high-speed network routing, and telecom/datacom infrastructure requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN65LVDT250DBT 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 decades of expertise in high-speed interface solutions.
The SN65LVDT250DBT belongs to TI's LVDS interface product line, engineered specifically for high-bandwidth, low-jitter signal routing in telecom infrastructure, wireless base stations, and datacenter interconnects.
FAQ
What is the key functional difference between SN65LVDT250DBT and SN65LVDS250DBT?
The SN65LVDT250DBT integrates 110-Ω termination resistors on each output, whereas the SN65LVDS250DBT requires external termination. This makes SN65LVDT250DBT ideal for space-constrained designs where minimizing external components is critical. Both share identical pinout, timing, and switching functionality - the termination is the sole distinguishing hardware feature confirmed in TI's SLLS594B datasheet.
Does SN65LVDT250DBT support LVPECL and CML inputs without external biasing?
Yes, SN65LVDT250DBT accepts LVPECL and CML input levels directly, as verified by TI's input electrical characteristics table (VIH/VIL ranges and common-mode tolerance up to 3.3 V). No external pull-up/down resistors or level shifters are required - the input stage is internally biased to accommodate these standards alongside LVDS.
What is the maximum guaranteed data rate for SN65LVDT250DBT in production use?
SN65LVDT250DBT is characterized and specified for operation above 2.0 Gbps, with typical performance validated up to 2.5 Gbps (110 ps pk-pk jitter at 2.5 Gbps per Figure 20). TI's datasheet confirms >2.0 Gbps operation across the full -40°C to +85°C range, making it suitable for 2.5-Gbps CPRI, XAUI, and proprietary high-speed protocols.
How does the flow-through pinout of SN65LVDT250DBT benefit PCB layout?
The flow-through pinout places inputs on left/right edges and outputs on top/bottom edges, enabling straight-line routing with minimal layer changes and reduced trace length asymmetry. This preserves differential pair integrity, minimizes skew, and simplifies impedance-controlled layout - a documented advantage in TI's application note SLLS594B Section 1.2 and Figure 21–24.
Is SN65LVDT250DBT pin-compatible with earlier revisions or alternate marking variants?
Yes, SN65LVDT250DBT is pin- and function-compatible with SN65LVDT250DBTR, SN65LVDT250DBT.B, and all other DBT-packaged variants marked "LVDT250" per TI's Package Option Addendum. All share identical 38-pin TSSOP (DBT) footprint, thermal ratings, and electrical specifications - only packaging format (tube vs. tape-and-reel) and marking differ.
SN65LVDT250DBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 65LVDT
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Crosspoint Switch
- Circuit:
- 1 x 4:4
- 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:
- 38-TSSOP
SN65LVDT250DBT FAQ
1.How can I place an order for SN65LVDT250DBT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN65LVDT250DBT 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 SN65LVDT250DBT reliable?
The price and inventory of SN65LVDT250DBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN65LVDT250DBT is usually 5 days.
3.What payment methods are accepted for SN65LVDT250DBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN65LVDT250DBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN65LVDT250DBT?
SN65LVDT250DBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN65LVDT250DBT 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 SN65LVDT250DBT?
For technical support, including SN65LVDT250DBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN65LVDT250DBT requirements.
6.How does Aetrix verify that SN65LVDT250DBT is sourced from the original manufacturer or authorized distributors?
All SN65LVDT250DBT 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 SN65LVDT250DBT meets industry standards.
7.What is the process for return or replacement of SN65LVDT250DBT?
All SN65LVDT250DBT units undergo pre-shipment inspection (PSI). If there is an issue with SN65LVDT250DBT, 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 SN65LVDT250DBT part is unused and in its original packaging.
Return procedure for SN65LVDT250DBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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