Texas Instruments CDCLVP2108RGZT

Overview

CDCLVP2108RGZT from Texas Instruments is a dual 1:8 LVPECL clock buffer IC designed for high-speed clock distribution in communication infrastructure. It accepts two differential or single-ended inputs (LVPECL/LVDS/LVCMOS), delivers 16 matched LVPECL output pairs, supports up to 2 GHz operation, achieves <100 fs RMS additive jitter (10 kHz–20 MHz), and maintains ≤25 ps within-bank output skew - enabling precise timing in wireless baseband and networking PHY layers.

For engineers reviewing the CDCLVP2108RGZT datasheet, CDCLVP2108RGZT pinout, CDCLVP2108RGZT application, or CDCLVP2108RGZT equivalent, key selection criteria include its dual-input fanout architecture, VQFN-48 thermal-pad package, 2.375–3.6 V supply range, AC-coupled input biasing via VAC_REF pins, and strict skew/jitter performance under 105°C PCB temperature conditions.

Technical Context

The CDCLVP2108RGZT implements two independent 1:8 LVPECL buffer blocks, each with dedicated differential input pairs (INP0/INN0 and INP1/INN1) driving eight matched output pairs (OUTP[0–7]/OUTN[0–7] and OUTP[8–15]/OUTN[8–15]). Its open-emitter LVPECL outputs require external 50-Ω termination to (VCC – 2 V), supported by on-die VAC_REF0/VAC_REF1 bias voltage sources for AC-coupled inputs.

It operates across 2.375–3.6 V supply and –40°C to +85°C ambient, with validated thermal performance up to 105°C PCB temperature at the exposed thermal pad. Input compatibility spans LVPECL (0.2–1.5 V_PP, 2 GHz max), LVDS, and LVCMOS (200 MHz max), while output specifications include 0.5–1.35 V_PP differential swing and 550 ps propagation delay.

Key Specifications

Pinout & Package

CDCLVP2108RGZT uses a 48-pin VQFN package (RGZ) with an exposed thermal pad soldered to GND. Pin assignment follows TI's standardized layout for dual-bank LVPECL fanout: Inputs occupy pins 3–4 (INP1/INN1) and 9–10 (INP0/INN0); 16 LVPECL output pairs occupy pins 14–47; VAC_REF0/VAC_REF1 are on pins 8 and 5; VCC supplies occupy pins 6–7, 13, 24, 37, and 48; GND on pins 1 and 12; NC on pins 2 and 11.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock buffer applications.

Compared with CDCLVP2108RGZT, LMK00308RTAR adds jitter cleaning but increases complexity and power, while Si53302-A-GM offers configurability at the cost of reduced output count and loss of true dual-input independence - making CDCLVP2108RGZT optimal for fixed, ultra-low-skew, high-output-count fanout in thermally constrained RF platforms.

Availability

CDCLVP2108RGZT is available at Aetrix Electronics and suitable for wireless infrastructure, optical transport, and medical imaging applications requiring stable component supply, long-term lifecycle assurance, and consistent electrical performance across production batches.

Supply support for CDCLVP2108RGZT 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 clock solutions, with decades of expertise in high-performance timing devices for communications and industrial markets.

The CDCLVP2108RGZT belongs to TI's high-speed clock buffer product line, engineered specifically for low-additive-jitter, multi-output clock distribution in 5G, OTN, and high-end test equipment where deterministic skew and thermal resilience are critical.

FAQ

What is the maximum operating frequency supported by the CDCLVP2108RGZT?

The CDCLVP2108RGZT supports a maximum clock frequency of 2 GHz, verified under differential input conditions with ≥0.2 V_PP swing and proper 50-Ω termination. This enables direct use with 100G Ethernet PAM4 transceivers, JESD204B/C converters, and high-speed SerDes PHYs without frequency division.

How does the CDCLVP2108RGZT handle AC-coupled LVPECL inputs?

The CDCLVP2108RGZT provides dedicated VAC_REF0 and VAC_REF1 pins (pins 8 and 5) to bias the unused negative input terminal when using single-ended AC-coupled signals. These outputs deliver a stable bias voltage (VCC – 1.6 V to VCC – 1.1 V) with 2 mA current limit, eliminating external bias resistors for simplified layout.

What is the significance of the 105°C PCB temperature rating for CDCLVP2108RGZT?

The 105°C PCB temperature rating means CDCLVP2108RGZT is characterized and guaranteed to operate reliably when the thermal pad reaches 105°C - critical for deployment in sealed telecom enclosures, high-power RF amplifiers, or industrial controllers where airflow is restricted and ambient temperatures exceed 85°C.

Can CDCLVP2108RGZT drive 50-Ω transmission lines directly?

Yes, CDCLVP2108RGZT is explicitly designed to drive 50-Ω transmission lines. Its open-emitter LVPECL outputs require external 50-Ω termination to (VCC – 2 V), implemented via Thevenin networks (e.g., 130 Ω to VCC and 82 Ω to GND for 2.5 V operation) as detailed in TI's application schematics.

What is the purpose of the NC pins on CDCLVP2108RGZT?

CDCLVP2108RGZT has two no-connect (NC) pins - pin 2 and pin 11 - which are electrically unconnected silicon pads. They must remain unconnected in PCB layout to avoid parasitic coupling or unintended current paths that could degrade jitter or skew performance.