Texas Instruments SN65ELT23DGKR

Overview

SN65ELT23DGKR from Texas Instruments is a dual 5-V differential PECL-to-TTL level translator in an 8-pin VSSOP package, delivering 24-mA TTL outputs with 3.5-ns typical propagation delay and support for 250-MHz clock frequencies. It features internal 50-kΩ pull-down resistors, output default-low behavior on open inputs, and built-in temperature compensation - designed for backplane clock/data transmission and signaling-level conversion in high-speed digital systems.

For engineers reviewing the SN65ELT23DGKR datasheet, SN65ELT23DGKR pinout, SN65ELT23DGKR application, or SN65ELT23DGKR equivalent, this page provides verified functional identity, validated pin assignments, confirmed thermal and AC performance specs, real-world use cases in clock distribution and backplane interfaces, and two technically documented alternative parts with precise compatibility notes.

Technical Context

The SN65ELT23DGKR implements two independent PECL input stages with differential receivers operating over 4.75–5.25 V supply, each driving a TTL-compatible output stage capable of sourcing/sinking 24 mA. Input common-mode range spans 2.2 V to VCC, supporting single-ended or differential PECL signal reception.

Its internal pull-down network ensures stable logic-low output when inputs are floating or below 1.3 V, eliminating external biasing. Propagation delay (tPLH/tPHL) is tightly controlled at 3.5 ns (typ), with random jitter under 10 ps RMS and rise/fall times ≤3.0 ns - enabling reliable operation up to 250 MHz in synchronous timing paths.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm body, 1.1 mm max height, 0.65 mm lead pitch, exposed pad optional per layout guidelines. RoHS-compliant NiPdAu lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PECL-to-TTL translation applications.

Compared with MC100ELT23DR2G, SN65ELT23DGKR offers guaranteed open-input low-state behavior and tighter delay matching; versus SN65LVDS31DR, it preserves PECL signal integrity without intermediate level-shifting stages - making it the sole direct-fit solution for existing PECL clock trees.

Availability

SN65ELT23DGKR is available at Aetrix Electronics and suitable for backplane clock distribution, industrial PLC timing modules, data signal translation, and test equipment synchronization requiring stable component supply across extended production lifecycles.

Supply support for SN65ELT23DGKR 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 ICs and clock management solutions.

The SN65ELT23DGKR belongs to TI's high-speed logic translator product line, engineered specifically for robust PECL-to-TTL signal conversion in mission-critical timing and backplane applications where jitter, skew, and fail-safe behavior are design-critical.

FAQ

What is the exact package type and dimensions of SN65ELT23DGKR?

The SN65ELT23DGKR uses the VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm body size, 1.1 mm maximum height, and 0.65 mm lead pitch. Its land pattern follows JEDEC MO-187, with recommended solder mask-defined pads and optional thermal vias under the exposed pad. The device is shipped in large tape-and-reel format (2500 units per reel) with MSL Level-1 rating.

Does SN65ELT23DGKR require external pull-up or pull-down resistors on its PECL inputs?

No - the SN65ELT23DGKR integrates internal 50-kΩ pull-down resistors on all PECL inputs (D0, D0, D1, D1). This ensures outputs Q0 and Q1 default to logic low when inputs are left open or fall below 1.3 V, eliminating the need for external biasing components and simplifying board layout for unused channels.

What is the maximum supported clock frequency for SN65ELT23DGKR, and under what conditions is it guaranteed?

The SN65ELT23DGKR supports up to 250 MHz maximum switching frequency, verified at VCC = 5.0 V, TA = 25°C, with VOL < 0.5 V and VOH > 2.4 V (per Figure 5 in the datasheet). This specification holds across the full operating temperature range (–40°C to +85°C) and supply range (4.75–5.25 V), with typical jitter remaining below 10 ps RMS.

How does SN65ELT23DGKR handle differential PECL input termination?

The SN65ELT23DGKR expects standard 50-Ω Thevenin termination to VCC–2 V on each differential PECL pair (e.g., D0/D0 and D1/D1). Its input stage is designed for nominal 400-mV differential swing (200–1000 mV assured), and the internal DC biasing eliminates need for external termination networks - though proper PCB routing and controlled impedance remain essential for signal integrity.

Is SN65ELT23DGKR pin-compatible with the SOIC-packaged SN65ELT23D?

Yes - SN65ELT23DGKR (VSSOP-8) and SN65ELT23D (SOIC-8) share identical pin numbering, pin functions, and electrical specifications. Both use the same 1–8 pinout: D0, D0, D1, D1, VCC, Q0, Q1, GND. Mechanical differences (package size, thermal resistance, mounting) exist, but no schematic or layout changes are needed when migrating between them.