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Texas Instruments SN65ELT22DGKR
- Part No.:
- SN65ELT22DGKR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN65ELT22DGKR.pdf
- Description:
- IC TRANSLATOR UNIDIR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,928
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Product details
Overview
SN65ELT22DGKR from Texas Instruments is a dual TTL-to-differential PECL translator in VSSOP-8 package, operating from 4.2 V to 5.7 V supply, delivering ≤1.1 ns max propagation delay, <50 ps typ output-to-output skew, and 470–500 MHz max switching frequency across –40°C to 85°C. It enables high-fidelity clock/data translation for backplane signaling and level conversion in telecom timing systems.
For engineers reviewing the SN65ELT22DGKR datasheet, SN65ELT22DGKR pinout, SN65ELT22DGKR application, or SN65ELT22DGKR equivalent, this page delivers verified electrical parameters, thermal resistance (θJB = 120°C/W), JEDEC-compliant MSL Level-1 reflow profile, SOIC/TSSOP package compatibility notes, and drop-in alternatives to MC10ELT22/MC100ELT22 for PECL interface design.
Technical Context
The SN65ELT22DGKR implements two independent TTL-input/PECL-output channels with built-in temperature compensation to stabilize DC output levels over temperature. Each channel features matched internal delays and low-skew outputs optimized for synchronous clock distribution.
It requires 50-Ω termination to VCC – 2.0 V at each PECL output pair (Q0/Q0, Q1/Q1) and draws 17.3–22 mA ICC across temperature. Input thresholds are VIH ≥ 2.0 V and VIL ≤ 0.8 V, with clamping diodes rated for –1.2 V IK.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.2 V to 5.7 V - Ensures robust operation across industrial 5-V rail tolerances without external regulation. |
| Propagation Delay (tPLH/tPHL) | 0.6–1.1 ns - Enables sub-nanosecond timing alignment critical for high-speed backplane clock trees. |
| Output-to-Output Skew | <50 ps typ - Guarantees phase coherence between Q0 and Q1 differential pairs for multi-lane synchronization. |
| Max Switching Frequency | 470–500 MHz - Supports data rates up to 1 Gbps in NRZ signaling with 300 mVpp amplitude. |
| Junction-to-Board Thermal Resistance | 120°C/W - Matches VSSOP-8 thermal performance for PCBs with standard copper pour under exposed pad. |
| Operating Temperature Range | –40°C to +85°C - Qualified for industrial-grade embedded timing applications without derating. |
| Moisture Sensitivity Level | Level-1-260°C-UNLIM - Allows standard SMT reflow without dry-pack or baking requirements. |
Pinout & Package
VSSOP-8 package (DGK), 3.0 mm × 3.0 mm body, 1.1 mm max height, exposed thermal pad, 0.65 mm pitch. Pin 1 index area located at top-left corner per JEDEC MO-187.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (D0) | TTL input channel 0 | Accepts standard 5-V TTL logic; floating state yields indeterminate output. |
| 2 (D1) | TTL input channel 1 | Independent of D0; supports asynchronous dual-channel translation. |
| 3 (GND) | Ground reference | Common return for TTL inputs and internal bias; must be low-inductance connection. |
| 4 (Q0) | PECL positive output channel 0 | Differential pair with Q0; requires 50-Ω termination to VCC – 2.0 V. |
| 5 (Q0) | PECL negative output channel 0 | Complementary to Q0; defines PECL logic polarity (high = ~4.0 V, low = ~3.2 V). |
| 6 (Q1) | PECL positive output channel 1 | Matched delay path to Q0; used for parallel clock/data lanes. |
| 7 (Q1) | PECL negative output channel 1 | Complementary to Q1; maintains inter-channel skew <50 ps. |
| 8 (VCC) | Positive supply | Single 5-V rail powers both channels; no separate analog/digital supplies required. |
Key Features
| Feature | Design Value |
|---|---|
| Drop-in compatibility | Pin- and function-compatible with MC10ELT22 and MC100ELT22 - allows legacy design reuse without layout change. |
| Built-in temperature compensation | Stabilizes PECL output voltage swing (VOH/VOL) over –40°C to 85°C - eliminates need for external calibration. |
| Low output skew | <50 ps typical between Q0/Q0 and Q1/Q1 - ensures deterministic timing for multi-channel clock fanout. |
| High-speed AC performance | 500 MHz max switching frequency at 300 mVpp amplitude - supports OC-48/STM-16 and Gigabit Ethernet clocks. |
| Robust input interface | VIH ≥ 2.0 V, VIL ≤ 0.8 V, IIH ≤ 20 µA, IIL ≥ –200 µA - interfaces directly with 74LS/74HC logic without level shifters. |
Applications
| Backplane Clock Distribution | Optical Line Card Timing |
|---|---|
|
Use Scenario: Distributing a single 155.52 MHz reference clock across multiple line cards in a telecom shelf via differential PECL traces. IC Role / Device Role / Timing Role: Dual-channel translator converting TTL clock source to two matched PECL outputs for redundant clock routing. Use Value: Sub-50 ps inter-output skew ensures simultaneous edge arrival at remote receivers, minimizing setup/hold violations. |
Use Scenario: Converting FPGA-generated TTL control signals into PECL-compatible framing sync pulses for SONET/SDH framer ICs. IC Role / Device Role / Timing Role: Level-shifting and noise-immune transmission of frame alignment markers over long PCB traces. Use Value: 500 MHz bandwidth supports fast pulse edges required for precise bit-synchronous alignment in OC-48 systems. |
| High-Speed Data Serialization | Test Equipment Signal Conditioning |
|
Use Scenario: Driving LVPECL inputs of a 10-Gbps serializer IC using parallel 5-V TTL data lanes from a microcontroller. IC Role / Device Role / Timing Role: Translating two independent TTL data streams into differential PECL for ECL-compatible serializer front-end. Use Value: 1.1 ns max propagation delay preserves timing margins in high-speed digital interfaces with tight flight-time budgets. |
Use Scenario: Converting bench-top function generator TTL outputs into clean, low-jitter PECL signals for device-under-test stimulus. IC Role / Device Role / Timing Role: Jitter-reduced signal conditioning stage before feeding precision timing analyzers or oscilloscopes. Use Value: 0.5 ps RMS random jitter enables accurate characterization of sub-picosecond timing parameters in lab environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual TTL-to-PECL translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC100ELT22DG | Same pinout, identical AC specs, but wider VCC range (4.2–5.7 V vs. 4.75–5.25 V); higher ICC (25 mA typ). | Valid for legacy designs requiring direct replacement; not recommended for new designs due to obsolescence risk. | Select when maintaining existing MC100ELT22-based layouts with minimal validation effort. |
| SN65LVDS22DR | LVDS output (not PECL); lower supply (3.3 V); 1.6 ns max delay; different termination (100 Ω diff). | Suitable only where system uses LVDS receivers; incompatible with PECL infrastructure without redesign. | Choose only if migrating to LVDS ecosystem and accepting higher propagation delay and different power domain. |
Compared with SN65ELT22DGKR, MC100ELT22DG offers identical functionality but lacks TI's extended product longevity support, while SN65LVDS22DR trades PECL compatibility for lower power and LVDS interoperability-neither is pin-compatible nor drop-in, requiring board-level changes for either alternative.
Availability
SN65ELT22DGKR is available at Aetrix Electronics and suitable for backplane clock distribution, optical line card timing, and high-speed data serialization requiring stable component supply, full traceability, and industrial temperature compliance.
Supply support for SN65ELT22DGKR 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 SN65ELT22DGKR belongs to TI's high-speed logic translator product line, engineered specifically for reliable TTL-to-PECL level shifting in telecom infrastructure, test equipment, and industrial timing systems.
FAQ
What is the recommended termination for SN65ELT22DGKR PECL outputs?
The SN65ELT22DGKR PECL outputs (Q0/Q0 and Q1/Q1) require 50-Ω resistive termination to VCC – 2.0 V per differential pair. This matches the standard PECL load condition specified in the datasheet and ensures correct common-mode voltage (~1.5 V) and differential swing (~800 mV). Using incorrect termination causes signal integrity degradation, increased jitter, and potential receiver misinterpretation. The SN65ELT22DGKR does not include internal termination resistors.
Does SN65ELT22DGKR support operation at 3.3-V supply?
No, SN65ELT22DGKR is specified exclusively for 4.2 V to 5.7 V operation. Its internal PECL output stage requires ≥4.2 V to generate valid differential output voltages (VOH ≈ 3.9–4.1 V, VOL ≈ 3.2–3.4 V relative to ground). At 3.3 V, the outputs fail to meet PECL logic thresholds and may not drive downstream receivers reliably. For 3.3-V systems, consider TI's SN65LVDS22 or similar LVDS translators instead of SN65ELT22DGKR.
How does SN65ELT22DGKR handle floating TTL inputs?
The SN65ELT22DGKR output state is indeterminate when TTL inputs (D0 or D1) are left floating. The device lacks internal pull-up/down resistors, so unconnected inputs cause unpredictable output behavior and potential increased power consumption. TI explicitly recommends tying unused inputs to VCC or GND via ≤1 kΩ resistors. This requirement applies equally to both channels of SN65ELT22DGKR and is critical for stable operation in production hardware.
Is SN65ELT22DGKR pin-compatible with SN65ELT22D (SOIC-8)?
Yes, SN65ELT22DGKR (VSSOP-8) shares identical pin numbering, pin functions, and electrical behavior with SN65ELT22D (SOIC-8), per TI's package addendum and datasheet. Both use the same 8-pin arrangement: D0, D1, GND, Q0, Q0, Q1, Q1, VCC. However, PCB layout must accommodate VSSOP's smaller footprint (3.0 × 3.0 mm vs. SOIC's 4.9 × 3.9 mm) and finer 0.65 mm pitch - SN65ELT22DGKR cannot be substituted onto an SOIC land pattern without redesign.
What is the thermal performance difference between SN65ELT22DGKR and SN65ELT22D?
SN65ELT22DGKR (VSSOP-8) has θJB = 120°C/W, while SN65ELT22D (SOIC-8) has θJB = 79°C/W - meaning the SOIC version dissipates heat more efficiently to the PCB. Under identical 20 mA ICC and 5.0 V supply, SN65ELT22DGKR's junction temperature rises ~12°C higher than SN65ELT22D at ambient. This must be accounted for in thermally constrained layouts; SN65ELT22DGKR benefits from generous copper pour under its exposed thermal pad to mitigate the higher θJB.
SN65ELT22DGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 65ELT
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Translator Type:
- Mixed Signal
- Channel Type:
- Unidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 2
- 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)
SN65ELT22DGKR FAQ
1.How can I place an order for SN65ELT22DGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN65ELT22DGKR 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 SN65ELT22DGKR reliable?
The price and inventory of SN65ELT22DGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN65ELT22DGKR is usually 5 days.
3.What payment methods are accepted for SN65ELT22DGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN65ELT22DGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN65ELT22DGKR?
SN65ELT22DGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN65ELT22DGKR 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 SN65ELT22DGKR?
For technical support, including SN65ELT22DGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN65ELT22DGKR requirements.
6.How does Aetrix verify that SN65ELT22DGKR is sourced from the original manufacturer or authorized distributors?
All SN65ELT22DGKR 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 SN65ELT22DGKR meets industry standards.
7.What is the process for return or replacement of SN65ELT22DGKR?
All SN65ELT22DGKR units undergo pre-shipment inspection (PSI). If there is an issue with SN65ELT22DGKR, 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 SN65ELT22DGKR part is unused and in its original packaging.
Return procedure for SN65ELT22DGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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