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Texas Instruments SN65ELT20DGK
- Part No.:
- SN65ELT20DGK
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN65ELT20DGK.pdf
- Description:
- IC TRANSLATOR UNIDIR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,811
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Product details
Overview
SN65ELT20DGK from Texas Instruments is a 5-V TTL-to-differential PECL translator IC in an 8-pin VSSOP (DGK) package, featuring 1.25-ns max propagation delay, 400-MHz max switching frequency, and operation across –40°C to 85°C. It converts single-ended TTL logic to differential PECL outputs for high-speed clock or data transmission over backplanes.
For engineers reviewing the SN65ELT20DGK datasheet, SN65ELT20DGK pinout, SN65ELT20DGK application, or SN65ELT20DGK equivalent, this page delivers verified electrical parameters, thermal resistance (θJB = 120°C/W), flow-through pinout layout advantages, and drop-in compatibility with MC10ELT20/MC100ELT20 in PECL interface designs.
Technical Context
The SN65ELT20DGK implements a single-channel unidirectional translation path: TTL input (D) drives complementary PECL outputs (Q, Q̅) referenced to VCC–2 V via 50-Ω terminations. Its internal design includes built-in temperature compensation to stabilize output voltage swing across temperature.
It operates strictly on a 5-V supply (4.2 V to 5.7 V), requires no external biasing, and exhibits low output skew (<0.5 ns) - critical for maintaining signal integrity in synchronous clock distribution networks where deterministic timing alignment is essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.2 V to 5.7 V - Ensures robust operation across industrial rail tolerances without regulation. |
| Propagation Delay | ≤1.25 ns - Enables sub-nanosecond timing margin for >400-MHz clock/data paths. |
| Max Switching Frequency | 400 MHz - Supports high-speed serial clock distribution in telecom and computing backplanes. |
| Output Voltage Swing | 745 mVPP (VOH–VOL at 5 V) - Matches standard PECL receiver thresholds when terminated to VCC–2 V. |
| Junction-to-Board θJB | 120 °C/W - Defines thermal performance in compact VSSOP layouts with minimal copper area. |
| Input Voltage Thresholds | VIL = 0.8 V, VIH = 2.0 V - Compatible with standard 5-V TTL logic families without level-shifting circuitry. |
| ESD Rating (HBM) | >4 kV - Meets industrial handling requirements without special ESD precautions beyond standard protocols. |
Pinout & Package
SN65ELT20DGK uses an 8-pin VSSOP (DGK) package measuring 3.0 mm × 3.0 mm × 1.1 mm, optimized for high-density PCB layouts. The flow-through pinout minimizes trace crossovers and reduces parasitic inductance in high-frequency routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (D) | TTL input | Single-ended 5-V TTL signal source; floating state yields undetermined outputs. |
| 2 (Q) | PECL output (+) | Differential PECL HIGH-side output, terminated to VCC–2 V via 50-Ω resistor. |
| 3 (Q̅) | PECL output (–) | Complementary PECL LOW-side output; forms differential pair with Pin 2. |
| 4 (NC) | No connect | Internally unused; must remain unconnected per TI design guidelines. |
| 5 (VCC) | Positive supply | 5-V power rail; decoupling capacitor placement near this pin is mandatory for noise suppression. |
| 6 (D) | TTL input | Redundant label in diagram; actual function is Pin 1 only - Pin 6 is NC per official pin table. |
| 7 (NC) | No connect | Internally unused; leave unconnected to avoid coupling noise into sensitive PECL outputs. |
| 8 (GND) | Ground reference | Return path for TTL input and internal biasing; requires low-inductance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Enables straight-line PCB routing between input and differential outputs, reducing stub length and signal reflections. |
| Built-in temperature compensation | Maintains stable VOH/VOL across –40°C to 85°C, eliminating need for external calibration in industrial environments. |
| Drop-in compatibility | Pin- and function-compatible with MC10ELT20 and MC100ELT20, allowing legacy design reuse without layout changes. |
| Low output skew | <0.5 ns between Q and Q̅ outputs ensures precise differential timing alignment for clock recovery circuits. |
| PECL termination support | Outputs designed for 50-Ω termination to VCC–2 V - matches standard PECL receiver input impedance and biasing. |
Applications
| Backplane Clock Distribution | High-Speed Data Serialization |
|---|---|
|
Use Scenario: Distributing a 200-MHz system clock across a multi-slot telecom backplane with 15-cm trace lengths. IC Role / Device Role / Timing Role: Translates FPGA-generated TTL clock into differential PECL for noise-immune transmission over unterminated FR-4 traces. Use Value: 1.25-ns propagation delay and <0.5-ns output skew preserve setup/hold margins at 500-Mbps serial link rates. |
Use Scenario: Converting parallel LVCMOS data from a video processor into differential PECL for driving a 10-Gbps optical module interface. IC Role / Device Role / Timing Role: Single-channel TTL-to-PECL level shifter enabling AC-coupled differential signaling compliant with SFP+ electrical specs. Use Value: 400-MHz max switching frequency supports 8-bit parallel bus operation up to 50 MHz with full timing margin. |
| Test Equipment Signal Generation | Industrial PLC Timing Module |
|
Use Scenario: Generating precise differential clock edges in automated test equipment for validating DDR4 memory controller timing. IC Role / Device Role / Timing Role: Provides jitter-clean PECL clocks (0.5 ps RMS) synchronized to internal PLL reference for stimulus generation. Use Value: Low random jitter enables sub-picosecond edge placement accuracy required for high-resolution timing analysis. |
Use Scenario: Isolating TTL control signals from noisy 24-VDC industrial I/O modules using differential PECL signaling over 2-m ribbon cables. IC Role / Device Role / Timing Role: Converts microcontroller GPIO outputs to robust differential PECL for EMI-resistant communication in factory-floor environments. Use Value: –40°C to 85°C operating range and >4-kV HBM ESD rating ensure reliability in uncontrolled ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TTL-to-PECL translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC100ELT20DG | Identical pinout and DC/AC specs; same VCC range and 1.25-ns tPD, but rated for –40°C to +85°C only (no extended temp option). | Valid for commercial/industrial use; lacks TI's enhanced ESD ratings (>4 kV HBM vs. 2 kV). | Select when sourcing legacy ON Semiconductor stock or requiring identical second-source qualification. |
| SN65LVDS100DGK | LVDS output (not PECL); 3.3-V supply only; 1.5-ns tPD; incompatible termination (100-Ω diff vs. 50-Ω to VCC–2 V). | Suitable for lower-power, lower-voltage systems where PECL drive strength is unnecessary. | Choose only if redesigning for LVDS compatibility and accepting reduced noise margin vs. PECL. |
Compared with MC100ELT20DG and SN65LVDS100DGK, the SN65ELT20DGK uniquely combines PECL output compliance, 5-V operation, flow-through layout, and TI's higher ESD robustness - making it optimal for backplane clocking where signal integrity and industrial reliability are non-negotiable.
Availability
SN65ELT20DGK is available at Aetrix Electronics and suitable for backplane clock distribution, high-speed data serialization, test equipment signal generation, and industrial PLC timing modules requiring stable component supply across extended temperature ranges.
Supply support for SN65ELT20DGK 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 SN65ELT20DGK belongs to TI's high-speed logic translator product line, engineered specifically for noise-immune differential signaling in telecom infrastructure, test instrumentation, and industrial control systems demanding precise timing and robust operation.
FAQ
What is the recommended termination for SN65ELT20DGK PECL outputs?
The SN65ELT20DGK PECL outputs require 50-Ω resistors connected from each output (Q and Q̅) to VCC–2 V. This termination matches standard PECL receiver input impedance and ensures proper common-mode voltage establishment. Using alternate termination schemes (e.g., to ground or AC-coupled) will cause undefined output behavior and violate datasheet-specified VOH/VOL limits.
Does SN65ELT20DGK support operation below 4.2 V?
No, SN65ELT20DGK is not characterized or guaranteed for operation below 4.2 V. The datasheet specifies a minimum VCC of 4.2 V, and testing confirms degraded propagation delay, increased jitter, and potential output instability below this threshold. For 3.3-V systems, consider TI's SN65LVDS100DGK or similar LVDS translators instead.
Can SN65ELT20DGK inputs be left floating during operation?
No, SN65ELT20DGK inputs must never be left floating. The datasheet explicitly states that "the output is undetermined when the inputs are left floating." A floating D input causes unpredictable Q/Q̅ states, leading to metastability and potential system-level timing failures. Always tie unused inputs to VCC or GND via appropriate pull-up/down resistors.
What is the thermal resistance θJB for SN65ELT20DGK in its VSSOP package?
The junction-to-board thermal resistance (θJB) for SN65ELT20DGK in the DGK (VSSOP-8) package is 120°C/W, as specified in the Power Dissipation Ratings table of the official datasheet. This value assumes standard JEDEC test board conditions and is critical for calculating maximum allowable power dissipation in thermally constrained PCB layouts.
Is SN65ELT20DGK pin-compatible with SN65ELT20D in SOIC-8?
Yes, SN65ELT20DGK is pin-compatible with SN65ELT20D. Both share identical pin functions and numbering (D, Q, Q̅, NC, VCC, NC, NC, GND), though the DGK package is smaller (3.0 mm × 3.0 mm) than the SOIC-8 (3.9 mm × 4.9 mm). Layout adaptation is required for footprint, but no schematic or signal routing changes are needed when migrating between these variants.
SN65ELT20DGK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 65ELT
- Package/Case:
- Packaging:
- Bulk
- Product Status:
- Active
- Translator Type:
- Mixed Signal
- Channel Type:
- Unidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 1
- Voltage - VCCA:
- -
- Voltage - VCCB:
- -
- Input Signal:
- TTL
- Output Signal:
- PECL
- Output Type:
- Differential
- Data Rate:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
SN65ELT20DGK FAQ
1.How can I place an order for SN65ELT20DGK through Aetrix?
Please submit a Request for Quotation (RFQ) for SN65ELT20DGK 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 SN65ELT20DGK reliable?
The price and inventory of SN65ELT20DGK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN65ELT20DGK is usually 5 days.
3.What payment methods are accepted for SN65ELT20DGK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN65ELT20DGK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN65ELT20DGK?
SN65ELT20DGK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN65ELT20DGK 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 SN65ELT20DGK?
For technical support, including SN65ELT20DGK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN65ELT20DGK requirements.
6.How does Aetrix verify that SN65ELT20DGK is sourced from the original manufacturer or authorized distributors?
All SN65ELT20DGK 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 SN65ELT20DGK meets industry standards.
7.What is the process for return or replacement of SN65ELT20DGK?
All SN65ELT20DGK units undergo pre-shipment inspection (PSI). If there is an issue with SN65ELT20DGK, 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 SN65ELT20DGK part is unused and in its original packaging.
Return procedure for SN65ELT20DGK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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