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Texas Instruments SN65ELT22D
- Part No.:
- SN65ELT22D
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN65ELT22D.pdf
- Description:
- IC TRANSLTR UNIDIRECTIONAL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,755
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Product details
Overview
SN65ELT22D from Texas Instruments is a dual TTL-to-differential PECL translator in SOIC-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 PECL output levels (VOH = 3915–4120 mV, VOL = 3170–3380 mV) for high-speed clock/data transmission over backplanes.
For engineers reviewing the SN65ELT22D datasheet, SN65ELT22D pinout, SN65ELT22D application, or SN65ELT22D equivalent, this device serves as a drop-in replacement for MC10ELT22/MC100ELT22 in 5-V PECL interface designs requiring low skew, temperature-compensated level translation, and industrial temperature support (–40°C to +85°C).
Technical Context
The SN65ELT22D implements two independent TTL-input/PECL-output channels with built-in temperature compensation to stabilize output voltage across –40°C to +85°C. Each channel accepts TTL logic levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and drives differential PECL outputs terminated to VCC – 2.0 V via 50-Ω resistors.
It operates exclusively on a single +5-V supply (VCC = 4.2–5.7 V, GND = 0 V), with no internal biasing or reference generation required. Output rise/fall times are 0.7–1.1 ns (20%–80%), and maximum switching frequency reaches 470 MHz at TA = 85°C with 300 mVpp amplitude.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.2 V to 5.7 V - Enables robust operation across industrial 5-V rail tolerances without external regulation. |
| Propagation Delay | ≤1.1 ns (max) - Supports sub-nanosecond timing alignment critical for high-speed backplane clock distribution. |
| Output-to-Output Skew | <50 ps (typ) - Ensures precise phase matching between Q0/Q0 and Q1/Q1 differential pairs for synchronous data capture. |
| PECL Output Voltage | VOH = 3915–4120 mV, VOL = 3170–3380 mV - Complies with standard PECL logic thresholds when terminated to VCC – 2.0 V. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial and telecom infrastructure environments without derating. |
| Input Compatibility | TTL-level inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V) - Directly interfaces with legacy 5-V logic families without level-shifting circuitry. |
| Max Switching Frequency | 470 MHz at TA = 85°C - Sustains high-speed data transmission in dense backplane applications with 300 mVpp swing. |
Pinout & Package
SN65ELT22D is housed in an industry-standard SOIC-8 package (D package), 3.94 mm × 4.90 mm footprint, 1.75 mm max height, with NiPdAu lead finish and moisture sensitivity level 1 (MSL-1, 260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (D0) | TTL input | Accepts standard 5-V TTL logic; floating state yields undefined output. |
| 2 (D1) | TTL input | Independent second TTL input channel; electrically isolated from D0 path. |
| 3 (Q0) | PECL true output | Differential PECL output paired with Q0; requires 50-Ω termination to VCC – 2.0 V. |
| 4 (Q0) | PECL complement output | Complementary PECL output for Q0; enables differential signaling with common-mode rejection. |
| 5 (GND) | Ground reference | Primary signal return path; must be low-impedance and decoupled near VCC pin. |
| 6 (VCC) | Positive supply | +5-V power input; supports 4.2–5.7 V range; requires local 0.1-µF ceramic bypass capacitor. |
| 7 (Q1) | PECL true output | Second differential PECL output channel; matched skew with Q0 for multi-lane timing. |
| 8 (Q1) | PECL complement output | Complement to Q1; forms second independent differential pair for parallel data paths. |
Key Features
| Feature | Design Value |
|---|---|
| Drop-in compatibility | Pin- and function-compatible with MC10ELT22 and MC100ELT22 - enables direct substitution without PCB redesign. |
| Built-in temperature compensation | Stabilizes PECL output voltage over –40°C to +85°C - eliminates need for external thermal feedback or calibration. |
| Low inter-channel skew | <50 ps typical output-to-output skew - ensures deterministic timing between dual channels for synchronized clock/data transfer. |
| Single-supply operation | Operates from +5-V supply only - removes requirement for negative rails or dual supplies common in older PECL translators. |
| High noise immunity | PECL differential outputs with 700–800 mV swing - provides >300 mV noise margin against EMI in noisy backplane environments. |
Applications
| Backplane Clock Distribution | High-Speed Data Link Interface |
|---|---|
|
Use Scenario: Distributing a single 100–400 MHz system clock across multiple line cards in a modular telecom chassis. IC Role / Device Role / Timing Role: Dual-channel PECL translator converting TTL clock source to differential PECL for low-skew, noise-immune transmission. Use Value: Sub-50 ps inter-output skew maintains phase coherence across card slots, enabling synchronous sampling at multi-Gbps rates. |
Use Scenario: Interfacing a 5-V FPGA I/O bank to a PECL-based SERDES PHY on an adjacent board. IC Role / Device Role / Timing Role: Level-shifting and signal conditioning block translating TTL control/data signals to PECL-compatible differential pairs. Use Value: Eliminates discrete resistor networks and improves signal integrity by providing matched rise/fall times (0.7–1.1 ns) and controlled output impedance. |
| Industrial PLC Timing Module | Test Equipment Signal Generator |
|
Use Scenario: Generating synchronized timing pulses for analog-to-digital acquisition across multiple sensor modules in factory automation. IC Role / Device Role / Timing Role: Dual-channel translator driving PECL clocks to ADCs and FPGAs with precise edge alignment. Use Value: Built-in temperature compensation ensures stable timing accuracy across wide ambient ranges (–40°C to +85°C) without recalibration. |
Use Scenario: Converting pattern generator TTL outputs to PECL for driving high-bandwidth oscilloscope or bit-error-rate tester inputs. IC Role / Device Role / Timing Role: High-fidelity signal translator preserving edge fidelity and minimizing jitter (<0.5 ps RMS). Use Value: 1.1 ns max propagation delay and low random jitter enable accurate stimulus delivery at frequencies up to 470 MHz. |
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 |
|---|---|---|---|
| MC10ELT22 | Same pinout and function, but obsolete; no longer in production by ON Semiconductor. | Legacy designs may require obsolescence mitigation; SN65ELT22D offers active supply and TI's long-term support. | Select SN65ELT22D for new designs requiring guaranteed availability and full technical documentation. |
| SN65ELT21D | Single-channel version (1× TTL-to-PECL) in same SOIC-8 package; identical electrical specs per channel. | Suitable only where one translation channel is needed; not a functional replacement for dual-channel requirement of SN65ELT22D. | Choose SN65ELT22D when dual independent channels are mandatory for clock + data or redundant timing paths. |
Compared with MC10ELT22 and SN65ELT21D, the SN65ELT22D uniquely delivers dual-channel TTL-to-PECL translation with active manufacturing status, MSL-1 packaging, and TI's industrial temperature qualification - making it the only supported, drop-in solution for new dual-channel backplane timing designs.
Availability
SN65ELT22D is available at Aetrix Electronics and suitable for backplane clock distribution, high-speed data link interface, and industrial PLC timing module applications requiring stable component supply, long lifecycle assurance, and traceable sourcing.
Supply support for SN65ELT22D 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 SN65ELT22D belongs to TI's high-speed logic translator product line, engineered specifically for reliable 5-V TTL-to-PECL conversion in telecom infrastructure, industrial control, and test equipment where timing precision and thermal stability are critical.
FAQ
What is the recommended termination for SN65ELT22D PECL outputs?
The SN65ELT22D PECL outputs require 50-Ω resistive termination to VCC – 2.0 V for proper logic level definition and signal integrity. This configuration ensures VOH ≈ 3.9–4.1 V and VOL ≈ 3.2–3.4 V under load, meeting standard PECL specifications. Avoid open-circuit or unterminated outputs, as they cause undefined states and increased jitter.
Does SN65ELT22D support operation below 4.2 V supply?
No, SN65ELT22D is not characterized or guaranteed for operation below 4.2 V. The absolute minimum supply voltage is 4.2 V per datasheet specifications; operation at lower voltages may result in degraded propagation delay, increased skew, or failure to meet VOH/VOL thresholds. Always maintain VCC within 4.2–5.7 V for full specification compliance.
Can SN65ELT22D drive AC-coupled PECL loads?
Yes, SN65ELT22D can drive AC-coupled PECL loads when used with appropriate DC biasing at the receiver side. The device itself does not provide internal bias; external termination to VCC – 2.0 V remains mandatory at the driver output. AC coupling is acceptable if the receiver supplies correct common-mode voltage (typically VCC – 1.3 V).
Is SN65ELT22D pin-compatible with SN65ELT22DGK?
Yes, SN65ELT22D (SOIC-8) and SN65ELT22DGK (VSSOP-8) share identical pin functions and ordering logic, but differ in physical package dimensions and thermal characteristics. While electrically compatible, PCB layout must be redesigned due to different footprints - SOIC-8 (D) measures 4.90 × 3.94 mm, VSSOP-8 (DGK) is 3.00 × 3.00 mm.
What is the maximum data rate supported by SN65ELT22D?
The SN65ELT22D supports a maximum switching frequency of 470 MHz at TA = 85°C with 300 mVpp output amplitude. At 25°C, it achieves up to 500 MHz. This corresponds to a maximum data rate of 940 Mbps (NRZ) or 470 Mbps (RZ), depending on encoding scheme and system-level signal integrity margins.
SN65ELT22D 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:
- 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-SOIC (0.154", 3.90mm Width)
SN65ELT22D FAQ
1.How can I place an order for SN65ELT22D through Aetrix?
Please submit a Request for Quotation (RFQ) for SN65ELT22D 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 SN65ELT22D reliable?
The price and inventory of SN65ELT22D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN65ELT22D is usually 5 days.
3.What payment methods are accepted for SN65ELT22D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN65ELT22D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN65ELT22D?
SN65ELT22D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN65ELT22D 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 SN65ELT22D?
For technical support, including SN65ELT22D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN65ELT22D requirements.
6.How does Aetrix verify that SN65ELT22D is sourced from the original manufacturer or authorized distributors?
All SN65ELT22D 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 SN65ELT22D meets industry standards.
7.What is the process for return or replacement of SN65ELT22D?
All SN65ELT22D units undergo pre-shipment inspection (PSI). If there is an issue with SN65ELT22D, 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 SN65ELT22D part is unused and in its original packaging.
Return procedure for SN65ELT22D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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