Texas Instruments CDCVF2505PW

Overview

CDCVF2505PW from Texas Instruments is a 3.3-V, 8-pin TSSOP phase-lock loop (PLL) clock driver IC designed for synchronous DRAM clock distribution. It delivers five low-skew, low-jitter outputs (1Y0–1Y3 and CLKOUT), operates from 24 MHz to 200 MHz, features integrated 25-Ω series damping resistors, and automatically enters 3-state power-down mode when CLKIN falls below ~12 MHz - enabling zero-delay buffering in server memory subsystems.

For engineers reviewing the CDCVF2505PW datasheet, CDCVF2505PW pinout, CDCVF2505PW application, or CDCVF2505PW equivalent, key selection considerations include its PLL-based zero-delay architecture, internal RC loop filter eliminating external components, 150 ps cycle-to-cycle jitter (66–200 MHz), 100 µs PLL lock time, and compatibility with spread-spectrum clocking in high-density SDRAM systems.

Technical Context

The CDCVF2505PW implements a single-input, five-output PLL architecture where CLKIN serves as the reference for an on-die oscillator; CLKOUT provides internal feedback to close the loop, enabling precise phase alignment between input and outputs. Its integrated RC loop filter and 25-Ω on-chip series termination eliminate external passive components and simplify point-to-point clock routing.

Functional modes are fully automatic: above ~20 MHz, the PLL locks and drives all outputs; below ~12 MHz, it disables the PLL and tri-states all outputs (1Y0–1Y3, CLKOUT). Edge detection on CLKIN triggers this transition without external control, supporting dynamic power management in memory controllers and industrial timing systems.

Key Specifications

Pinout & Package

Package: 8-pin TSSOP (PW), 4.40 mm × 3.00 mm body size, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CDCVF2505D and CDCVF2505PWR, the CDCVF2505PW offers the smallest PCB footprint among CDCVF2505 variants and fastest procurement readiness in tube packaging - making it ideal for engineering validation, lab testing, and small-batch SDRAM timing evaluation where thermal headroom exceeds 175°C/W and reel logistics are unnecessary.

Availability

CDCVF2505PW is available at Aetrix Electronics and suitable for synchronous DRAM memory subsystems, industrial control timing distribution, and general-purpose zero-delay clock buffering requiring stable component supply across extended temperature ranges (–40°C to 85°C).

Supply support for CDCVF2505PW 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 over 90 years of innovation in precision timing and power-efficient IC design.

The CDCVF2505PW belongs to TI's high-performance clock distribution product line, engineered specifically for low-skew, low-jitter synchronization in memory-intensive computing platforms including servers, telecom infrastructure, and industrial automation controllers.

FAQ

What is the function of the CLKOUT pin on the CDCVF2505PW?

The CLKOUT pin on the CDCVF2505PW provides the internal feedback signal for the PLL and must not be loaded externally beyond a small tuning capacitor (typically 3–25 pF). It is not intended to drive any circuitry - its sole purpose is to adjust the phase relationship between CLKIN and the 1Y outputs by introducing controlled delay into the feedback path, enabling precise zero-delay configuration.

Does the CDCVF2505PW require external loop filter components?

No, the CDCVF2505PW integrates a complete RC loop filter on-die, eliminating the need for external resistors or capacitors. This integration reduces bill-of-materials cost, saves PCB area, and improves reliability by removing solder joints and component tolerances associated with discrete loop filters - a key differentiator from non-integrated PLL clock drivers.

How does the CDCVF2505PW enter and exit power-down mode?

The CDCVF2505PW uses an internal edge detector on CLKIN to autonomously enter power-down mode when input frequency drops below ~12 MHz (typical), disabling the PLL and placing all outputs (1Y0–1Y3, CLKOUT) in high-impedance state. It exits power-down and relocks the PLL within 100 µs when CLKIN rises above ~20 MHz - no external enable signal or reset is required.

Can the CDCVF2505PW drive unterminated transmission lines?

Yes - each output (1Y0–1Y3) includes a built-in 25-Ω series damping resistor optimized for point-to-point connections to typical 50-Ω PCB traces. This on-chip termination minimizes overshoot, ringing, and reflections without requiring external resistors, simplifying layout and improving signal integrity in dense memory routing environments.

Is the CDCVF2505PW compatible with spread-spectrum clocking?

Yes, the CDCVF2505PW's PLL bandwidth is specifically designed to track spread-spectrum clock (SSC) inputs with modulation depths up to ±1%, enabling effective EMI reduction in server and telecom applications. Unlike fixed-ratio buffers, its adaptive PLL maintains phase coherence even under frequency modulation, preserving timing margins for high-speed memory interfaces.