Texas Instruments SN65CML100DGKG4

Overview

SN65CML100DGKG4 from Texas Instruments is a 1.5-Gbps LVDS/LVPECL/CML-to-CML translator/repeater in an 8-pin VSSOP package, supporting differential signaling with ≤70 ps peak-to-peak jitter, 800 ps max propagation delay, and direct drive of 25-Ω or 50-Ω loads at 1.8-V/2.5-V/3.3-V supplies. It enables high-speed clock distribution in central office systems.

For engineers reviewing the SN65CML100DGKG4 datasheet, SN65CML100DGKG4 pinout, SN65CML100DGKG4 application, or SN65CML100DGKG4 equivalent, key selection criteria include its CML-compatible output drive capability, wide 0–4-V common-mode input range enabling direct coupling, low part-to-part skew (≤100 ps), and support for single-ended LVPECL inputs via VBB reference voltage.

Technical Context

This device implements a fully differential internal data path to minimize pulse-width distortion and noise generation. Its receiver accepts LVDS (TIA/EIA-644), LVPECL, and CML signaling levels, with 25 mV hysteresis over a 0–4-V common-mode range - allowing direct AC or DC coupling without external biasing networks.

The transmitter delivers CML-level outputs referenced to VTT (1.8 V/2.5 V/3.3 V), with differential output voltage magnitude ranging from 285 mV to 1000 mV depending on termination (25 Ω or 50 Ω) and VTT level. VBB provides an internally generated 1.95 V reference for single-ended LVPECL input operation, requiring only a 0.01-µF decoupling capacitor when used.

Key Specifications

Pinout & Package

SN65CML100DGKG4 is housed in an 8-pin VSSOP (DGK) package, 3.0 mm × 3.0 mm × 1.1 mm body size, with exposed thermal pad (PowerPAD™), RoHS-compliant NiPdAu lead finish, and JEDEC MO-187 registration.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed level translation applications.

Compared with SN65LVD230DR and LMH0384SQ/NOPB, SN65CML100DGKG4 uniquely combines CML output drive, 0–4-V common-mode input tolerance, and VBB-based single-ended LVPECL support - making it the only option among the three capable of seamless LVDS/LVPECL/CML interoperability in telecom clock trees.

Availability

SN65CML100DGKG4 is available at Aetrix Electronics and suitable for 622-MHz central office clock distribution, high-speed network routing, and wireless basestation baseband applications requiring stable component supply and long-term industrial temperature support (–40°C to 85°C).

Supply support for SN65CML100DGKG4 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 technologies, with decades of heritage in precision timing and interface solutions.

The SN65CML100DGKG4 belongs to TI's high-speed interface portfolio, designed specifically for low-jitter signal translation in telecom infrastructure, networking equipment, and wireless baseband subsystems where CML interoperability and direct-coupled operation are mandatory.

FAQ

What is the maximum supported data rate for SN65CML100DGKG4?

The SN65CML100DGKG4 supports signaling rates up to 1.5 Gbps, validated using 2²³−1 PRBS patterns and 750 MHz clock inputs under recommended operating conditions (VCC = 3.3 V, TA = 25°C, |VID| = 200 mV). This rate is guaranteed across the full industrial temperature range (–40°C to 85°C) with total jitter ≤70 ps peak-to-peak.

Can SN65CML100DGKG4 accept single-ended LVPECL inputs?

Yes - SN65CML100DGKG4 supports single-ended LVPECL inputs via the VBB pin. When used, the unused differential input (A or B) is tied to VBB (1.95 V ±60 mV), and VBB must be decoupled with a 0.01-µF capacitor. The device draws ≤400 µA from VBB, and this configuration is explicitly characterized in the datasheet for LVPECL compatibility.

What load impedances does SN65CML100DGKG4 drive directly?

SN65CML100DGKG4 directly drives 25-Ω and 50-Ω loads terminated to VTT (1.8 V, 2.5 V, or 3.3 V), with differential output voltage magnitudes ranging from 285 mV to 1000 mV depending on termination and VTT level. No external coupling capacitors or biasing resistors are required, simplifying layout and improving signal integrity.

Does SN65CML100DGKG4 require external termination resistors on its inputs?

No - SN65CML100DGKG4 has internally matched input impedance and does not require external termination resistors. Its receiver is designed for direct connection to standard LVDS, LVPECL, or CML sources. External termination is only needed on the output side (RT = 25 Ω or 50 Ω to VTT), as specified in the output electrical characteristics table.

What is the function of the NC pin on SN65CML100DGKG4?

The NC (No Connect) pin on SN65CML100DGKG4 is not internally bonded and serves no electrical function. It must remain unconnected on the PCB to prevent unintended coupling, ESD susceptibility, or thermal stress. TI's package drawing DGK0008A confirms this pin is non-functional and excluded from die bonding.