Texas Instruments CDCF2510PWR

Overview

CDCF2510PWR from Texas Instruments is a 3.3-V, PLL-based clock distribution IC designed for PC133 SDRAM Registered DIMM applications. It distributes one input clock to ten low-skew, low-jitter outputs with ±125 ps static phase error (66–133 MHz), 70 ps cycle-to-cycle jitter, and integrated 25-Ω series-damping resistors - eliminating external RC networks.

For engineers reviewing the CDCF2510PWR datasheet, CDCF2510PWR pinout, CDCF2510PWR application, or CDCF2510PWR equivalent, key selection criteria include its 24-pin TSSOP package, PLL stabilization time (1 ms), output enable (G) control, FBIN/FBOUT feedback loop architecture, and compatibility with spread-spectrum clocking (SSC) in memory subsystems.

Technical Context

The CDCF2510PWR implements a fully integrated PLL with on-chip loop filter and analog power supply (AVCC) for precise phase alignment between CLK and FBOUT. Its feedback path requires hard-wired FBOUT→FBIN connection to achieve zero-phase-error synchronization across all 10 outputs.

It operates exclusively at 3.3 V (VCC/AVCC = 3.0–3.6 V), supports 25–140 MHz input frequencies, and delivers 50% duty-cycle outputs independent of input duty cycle. The G input enables/disables all outputs simultaneously to logic-low state, while AVCC strapping to ground bypasses the PLL for test-mode direct buffering.

Key Specifications

Pinout & Package

Package: 24-pin TSSOP (PW), RoHS-compliant, moisture sensitivity level 1, rated for 0°C to 70°C operating temperature.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CDCF2510PW, CDCF2510PWR offers optimized logistics for high-volume manufacturing, while CDCVF2510A provides measurable jitter and temperature improvements - making it preferable for next-generation designs where long-term availability and enhanced specs justify redesign effort.

Availability

CDCF2510PWR is available at Aetrix Electronics and suitable for PC133 Registered DIMM modules, server memory subsystems, and industrial embedded SDRAM interfaces requiring stable component supply and long-lifecycle support.

Supply support for CDCF2510PWR 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 logic technologies, with decades of expertise in high-speed timing solutions.

The CDCF2510PWR belongs to TI's clock distribution product line, engineered specifically for synchronous DRAM memory subsystems - delivering low-skew, low-jitter, PLL-synchronized clock fanout with minimal external components.

FAQ

What is the recommended operating voltage for CDCF2510PWR?

The CDCF2510PWR requires a nominal 3.3-V supply with a recommended operating range of 3.0 V to 3.6 V for both VCC and AVCC. Operation outside this range may cause PLL instability or increased jitter. The device draws less than 10 µA quiescent current at 3.3 V, and supply current scales with clock frequency per Figure 9 in the datasheet. Always decouple VCC and AVCC separately with 0.1-µF ceramic capacitors near their respective pins.

Does CDCF2510PWR support spread-spectrum clocking (SSC)?

Yes, CDCF2510PWR is explicitly designed to be spread-spectrum clock compatible, as confirmed in the device description and application report SCAA039. Its PLL architecture tolerates input frequency modulation within standard SSC profiles (±0.25% to ±0.5%), maintaining lock and delivering low-jitter outputs without unlocking or introducing additional phase noise - essential for EMI reduction in dense memory modules.

How is the feedback loop configured for CDCF2510PWR?

The CDCF2510PWR feedback loop requires FBOUT (pin 12) to be hard-wired to FBIN (pin 13). This closed-loop configuration allows the internal PLL to synchronize FBOUT to CLK with nominal zero phase error. The datasheet emphasizes that FBIN must receive a clean, low-noise copy of FBOUT - trace length should be minimized (<5 mm, 50-Ω impedance per Figure 3), and no external capacitance should be added unless phase adjustment is needed per application note SLMA003.

What is the purpose of the AVCC pin on CDCF2510PWR?

AVCC (pin 23) supplies power to the analog portion of the CDCF2510PWR, including the PLL core and charge pump. It must be tied to the same 3.3-V rail as VCC but decoupled independently. Critically, strapping AVCC to ground places the CDCF2510PWR into test mode, bypassing the PLL and routing CLK directly to all outputs - a valuable feature for functional verification without waiting for PLL lock.

Can CDCF2510PWR drive unterminated transmission lines?

Yes - CDCF2510PWR integrates a 25-Ω series-damping resistor on each of its 10 outputs (1Y0–1Y9) and FBOUT, enabling direct point-to-point connection to SDRAM register inputs without external termination. This design eliminates stub reflections and reduces board space, but assumes controlled-impedance routing (typically 50 Ω) and proper load capacitance (≤25 pF per datasheet Figure 1). Mismatched loads may degrade skew or jitter performance.