Texas Instruments SN65CML100DGKRG4

Overview

SN65CML100DGKRG4 from Texas Instruments is a 1.5-Gbps LVDS/LVPECL/CML-to-CML translator/repeater IC designed for high-speed signal integrity in network routing and clock distribution. It supports differential input compatibility with LVDS, LVPECL, and CML signaling, delivers CML-compatible outputs directly driving 25-Ω or 50-Ω loads, and operates at 3.3-V supply with ≤800 ps max propagation delay.

For engineers reviewing the SN65CML100DGKRG4 datasheet, SN65CML100DGKRG4 pinout, SN65CML100DGKRG4 application, or SN65CML100DGKRG4 equivalent, key selection considerations include its wide 0–4-V common-mode input range, 25-mV input hysteresis, <70-ps peak-to-peak jitter at 1.5 Gbps, 100-ps max part-to-part skew, and VBB reference support for single-ended LVPECL inputs.

Technical Context

This device implements a fully differential internal data path to minimize pulse-width distortion and noise coupling. Its receiver accepts LVDS (TIA/EIA-644), LVPECL, and CML levels with direct-coupled capability across 0–4 V common-mode range, while the driver outputs conform to CML logic levels referenced to VTT (1.8 V, 2.5 V, or 3.3 V) and support both 25-Ω and 50-Ω terminations.

The VBB pin provides an internally generated ~1.95-V switching reference for single-ended LVPECL input operation-requiring 0.01-µF decoupling and current limiting to ±400 µA. When unused, VBB must remain open; improper handling risks signal integrity degradation or functional failure.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm body, 0.65 mm pitch, 1.1 mm max height, exposed thermal pad (PowerPAD™), RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed differential translator applications.

Compared with SN65LVDS100DGKRG4 and LMH0384SQ/NOPB, the SN65CML100DGKRG4 uniquely supports three input standards (LVDS/LVPECL/CML) with VBB-assisted single-ended operation, making it the only option for legacy LVPECL clock integration into modern CML PHY designs without redesigning the source interface.

Availability

SN65CML100DGKRG4 is available at Aetrix Electronics and suitable for 622-MHz clock distribution, high-speed network routing, and wireless basestation baseband applications requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for SN65CML100DGKRG4 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 high-performance signal chain solutions with decades of expertise in timing, interface, and high-speed connectivity ICs.

The SN65CML100DGKRG4 belongs to TI's high-speed interface translator product line, engineered specifically for jitter-sensitive telecom, networking, and wireless infrastructure where signal fidelity, multi-standard compatibility, and reliability across temperature extremes are critical.

FAQ

What is the maximum data rate supported by the SN65CML100DGKRG4?

The SN65CML100DGKRG4 supports signaling rates up to 1.5 Gbps, validated with 223−1 PRBS patterns and confirmed via eye diagram testing at 750 MHz clock frequency. This maximum rate is guaranteed across the full operating temperature range (–40°C to 85°C) and applies to both LVDS/LVPECL input and CML output configurations.

Can the SN65CML100DGKRG4 accept single-ended LVPECL inputs?

Yes, the SN65CML100DGKRG4 supports single-ended LVPECL inputs using the VBB pin as a switching reference voltage (~1.95 V). The unused differential input (A or B) is connected to VBB, and a 0.01-µF capacitor must decouple VBB. Current sourcing/sinking must be limited to ±400 µA; leaving VBB open disables this mode.

What load impedances does the SN65CML100DGKRG4 support on its CML outputs?

The SN65CML100DGKRG4 directly drives 25-Ω or 50-Ω loads terminated to VTT (1.8 V, 2.5 V, or 3.3 V). Output specifications-including VOH, VOL, and |VOD|-are characterized for both terminations, eliminating the need for external series resistors or coupling capacitors in compliant PCB layouts.

How does the SN65CML100DGKRG4 handle common-mode voltage variations at its inputs?

The SN65CML100DGKRG4 accepts a wide 0–4-V common-mode input range, enabling direct coupling to LVPECL, CML, and LVDS sources without AC-coupling capacitors. Its internal receiver tolerates this full range while maintaining 25-mV hysteresis and valid logic thresholds, ensuring robust operation despite supply or trace-length mismatches.

Is the SN65CML100DGKRG4 pin-compatible with other devices in the SN65CMLxx family?

No, the SN65CML100DGKRG4 is not pin-compatible with other SN65CMLxx variants such as SN65CML101 or SN65CML102. Each variant has distinct pin functions and internal architectures; for example, SN65CML101 lacks VBB and supports only CML-to-CML translation. Always verify pinout and functional block diagrams before substitution.