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Texas Instruments SN65ELT23DR
- Part No.:
- SN65ELT23DR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN65ELT23DR.pdf
- Description:
- IC TRANSLTR UNIDIRECTIONAL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,432
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Product details
Overview
SN65ELT23DR from Texas Instruments is a dual 5-V differential PECL-to-TTL translator IC used for level-shifting clock and data signals between high-speed PECL backplane interfaces and TTL logic domains. It delivers 24-mA TTL outputs, supports up to 250 MHz switching frequency, features 3.5-ns typical propagation delay, and includes internal 50-kΩ pull-down resistors on PECL inputs to ensure low-level default state when inputs are open or below 1.3 V.
For engineers reviewing the SN65ELT23DR datasheet, SN65ELT23DR pinout, SN65ELT23DR application, or SN65ELT23DR equivalent, key selection considerations include its SOIC-8 package compatibility, PECL input common-mode range (2.2 V to 5.0 V), TTL output voltage compliance (VOH ≥ 2.4 V at –3 mA, VOL ≤ 0.5 V at 24 mA), thermal resistance (θJA = 139 °C/W, low-K board), and drop-in functional equivalence to MC100ELT23 in legacy designs.
Technical Context
The SN65ELT23DR implements two independent PECL-to-TTL translation channels with differential PECL inputs (D0/D0, D1/D1) and single-ended TTL outputs (Q0, Q1), each featuring built-in temperature compensation and input hysteresis. Its internal 50-kΩ pull-down ensures deterministic low-state behavior during floating or unterminated conditions.
It operates across –40°C to +85°C with VCC = 4.75 V to 5.25 V, delivers 20–27 mA supply current depending on load and temperature, and maintains sub-5 ns propagation delay (tPLH/tPHL) with <10 ps RMS random jitter - enabling reliable use in synchronous clock distribution and high-speed serial data recovery paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75 V to 5.25 V - ensures stable operation under standard 5-V rail tolerances without external regulation |
| Max Switching Frequency | 250 MHz - supports high-speed clock/data transmission in backplane and telecom timing applications |
| Propagation Delay | 3.5 ns typical - enables tight timing budgets in synchronous systems with minimal skew accumulation |
| TTL Output Drive | 24 mA sink capability - directly drives standard TTL loads without external buffers or level shifters |
| PECL Input Pull-Down | 50 kΩ internal - eliminates need for external biasing resistors and guarantees known logic state during open-circuit conditions |
| Input Common-Mode Range | 2.2 V to 5.0 V - accommodates wide PECL signal swing variations while maintaining valid logic interpretation |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and communications equipment deployment |
Pinout & Package
SN65ELT23DR is housed in an industry-standard SOIC-8 (D) package, 3.9 mm × 4.9 mm body size, 1.75 mm max height, with gull-wing leads and NiPdAu lead finish. Pin 1 orientation follows JEDEC MS-012 AA outline with quadrant Q1 tape-and-reel placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0, D0 | Differential PECL input pair (Channel 0) | Accepts complementary PECL signals; common-mode range 2.2–5.0 V; internally pulled down to GND via 50 kΩ |
| D1, D1 | Differential PECL input pair (Channel 1) | Independent second channel with identical PECL interface characteristics and default-low behavior |
| Q0 | TTL output (Channel 0) | Single-ended 24-mA sink/output compliant with TTL VOH ≥ 2.4 V and VOL ≤ 0.5 V specifications |
| Q1 | TTL output (Channel 1) | Electrically isolated TTL output matching Q0's drive strength and voltage thresholds |
| VCC | Positive supply | 5-V power rail; supplies both PECL receiver and TTL driver circuitry; decoupling required near pin |
| GND | Ground reference | Common return path for all I/O and internal logic; must be low-impedance for jitter and noise control |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent translation channels | Enables simultaneous clock and data conversion without cross-talk or shared timing constraints |
| Internal 50-kΩ input pull-down | Eliminates external bias components and prevents undefined states during hot-plug or unconnected backplane scenarios |
| Built-in temperature compensation | Maintains consistent propagation delay and output thresholds across –40°C to +85°C operating range |
| Drop-in compatibility with MC100ELT23 | Allows direct replacement in existing MC100ELT23-based designs without PCB or firmware changes |
| Low thermal resistance (θJA = 139 °C/W) | Supports continuous 25 mA supply current at full temperature range without derating in standard SOIC layout |
Applications
| Backplane Clock Distribution | Data Acquisition Timing Interface |
|---|---|
Use Scenario: Distributing a 200-MHz system clock across multiple daughter cards in a modular telecom chassis using differential PECL signaling over long traces. IC Role / Device Role / Timing Role: PECL-to-TTL translator converting backplane clock to local TTL domain for FPGA configuration and ADC sampling clocks. Use Value: Ensures sub-5 ns deterministic delay and <10 ps jitter transfer, preserving setup/hold margins for downstream logic. | Use Scenario: Interfacing a high-speed PECL serial data stream from a sensor front-end to a microcontroller with TTL-level UART or parallel capture interface. IC Role / Device Role / Timing Role: Signal-level translator enabling direct connection of PECL-output sensors to TTL-input processors without intermediate amplification. Use Value: 24-mA drive strength and 250-MHz bandwidth support real-time streaming of 16-bit ADC samples at >100 MSPS. |
| Industrial PLC Synchronization | Legacy System Upgrade Bridge |
Use Scenario: Synchronizing distributed I/O modules in an industrial PLC rack where master clock is PECL but slave controllers require TTL-compatible timing inputs. IC Role / Device Role / Timing Role: Deterministic level shifter providing fail-safe low-default outputs during module insertion/removal events. Use Value: Internal 50-kΩ pull-down prevents spurious triggering during hot-swap transitions, improving system robustness. | Use Scenario: Replacing obsolete MC100ELT23 in a deployed base station timing card to extend product lifecycle without redesign. IC Role / Device Role / Timing Role: Pin- and function-compatible drop-in replacement maintaining identical timing behavior and thermal profile. Use Value: Eliminates requalification effort and PCB rework while meeting original spec for propagation delay and jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PECL-to-TTL translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC100ELT23DG | Same pinout and function; requires 5.0 V ±5% supply; no internal pull-down - external biasing needed | Not suitable for open-input or hot-swap scenarios without added components | Select only if legacy design already includes external 50-kΩ pull-downs and strict 5.0 V regulation is available |
| SN65LVDS23DR | LVDS input instead of PECL; 3.3-V supply; lower power (12 mA ICC); 200-MHz max frequency | Requires LVDS source and 3.3-V infrastructure; not compatible with PECL backplanes | Choose only when migrating to LVDS signaling and reducing power is prioritized over backward compatibility |
Compared with MC100ELT23DG and SN65LVDS23DR, SN65ELT23DR uniquely combines PECL input compatibility, integrated pull-down, 5-V operation, and 250-MHz performance in SOIC-8 - making it the sole option for drop-in upgrades of MC100ELT23-based systems requiring zero-layout change and guaranteed fail-safe default state.
Availability
SN65ELT23DR is available at Aetrix Electronics and suitable for backplane clock distribution, industrial PLC synchronization, and legacy system upgrade bridge applications requiring stable component supply, long-term industrial temperature support, and drop-in compatibility with MC100ELT23.
Supply support for SN65ELT23DR 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 company specializing in analog, embedded processing, and connectivity technologies, with leadership in high-speed interface and timing solutions.
The SN65ELT23DR belongs to TI's SN65E series of PECL/TTL/LVDS translators, designed specifically for robust signal integrity in telecom infrastructure, industrial automation, and test equipment where deterministic level shifting and fail-safe defaults are critical.
FAQ
What is the maximum operating frequency supported by the SN65ELT23DR?
The SN65ELT23DR supports a maximum switching frequency of 250 MHz under specified conditions (VOL < 0.5 V and VOH > 2.4 V). This value is verified across the full operating temperature range (–40°C to +85°C) and is measured with 20 pF load capacitance and 500 Ω output termination. The device maintains this performance due to optimized internal circuitry and low-propagation-delay architecture, making SN65ELT23DR suitable for high-speed clock and data translation in backplane applications.
Does the SN65ELT23DR require external pull-down resistors on its PECL inputs?
No, the SN65ELT23DR does not require external pull-down resistors. It integrates internal 50-kΩ pull-down resistors on all PECL inputs (D0/D0 and D1/D1), ensuring a defined logic-low state when inputs are left open or driven below 1.3 V. This feature eliminates the need for external biasing components and improves reliability in hot-swap or unterminated backplane environments - a key differentiator of SN65ELT23DR versus alternatives like MC100ELT23DG.
What package type and dimensions does the SN65ELT23DR use?
The SN65ELT23DR uses an SOIC-8 (D) package per JEDEC MS-012 variation AA, with body dimensions of 3.9 mm × 4.9 mm and maximum height of 1.75 mm. It features gull-wing leads, NiPdAu lead finish, and moisture sensitivity level 1 (MSL-1) rating. The device is supplied in large tape-and-reel format (2500 units/reel), with pin 1 located in quadrant Q1 per TI's packaging specification - confirming full mechanical and assembly compatibility with standard SOIC-8 footprints used for SN65ELT23DR.
How does the SN65ELT23DR compare to the MC100ELT23 in terms of pin compatibility and functionality?
The SN65ELT23DR is explicitly documented as drop-in compatible with the MC100ELT23, sharing identical pinout, electrical interface, and functional behavior. Both devices support dual PECL-to-TTL translation with 250-MHz capability and 3.5-ns propagation delay. However, SN65ELT23DR adds internal 50-kΩ pull-down resistors and built-in temperature compensation - enhancements that improve robustness without altering pin assignments or requiring PCB modifications. Thus, SN65ELT23DR serves as a direct, enhanced replacement for MC100ELT23 in deployed systems.
What are the absolute maximum ratings for the SN65ELT23DR supply voltage and operating temperature?
The SN65ELT23DR has an absolute maximum supply voltage (VCC) of 6 V and an absolute maximum operating temperature range of –40°C to +85°C. Exceeding these limits may cause permanent damage. The recommended operating range is VCC = 4.75 V to 5.25 V and TA = –40°C to +85°C, within which all electrical parameters - including propagation delay, output drive, and jitter - are fully specified and guaranteed. These ratings are validated per TI's production test flow and apply directly to SN65ELT23DR in SOIC-8 packaging.
SN65ELT23DR 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:
- PECL
- Output Signal:
- TTL
- Output Type:
- Non-Inverted
- 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)
SN65ELT23DR FAQ
1.How can I place an order for SN65ELT23DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN65ELT23DR 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 SN65ELT23DR reliable?
The price and inventory of SN65ELT23DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN65ELT23DR is usually 5 days.
3.What payment methods are accepted for SN65ELT23DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN65ELT23DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN65ELT23DR?
SN65ELT23DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN65ELT23DR 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 SN65ELT23DR?
For technical support, including SN65ELT23DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN65ELT23DR requirements.
6.How does Aetrix verify that SN65ELT23DR is sourced from the original manufacturer or authorized distributors?
All SN65ELT23DR 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 SN65ELT23DR meets industry standards.
7.What is the process for return or replacement of SN65ELT23DR?
All SN65ELT23DR units undergo pre-shipment inspection (PSI). If there is an issue with SN65ELT23DR, 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 SN65ELT23DR part is unused and in its original packaging.
Return procedure for SN65ELT23DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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