Diodes Incorporated PI6CVF857AE

Overview

PI6CVF857AE from Pericom Semiconductor is a 1:10 PLL-based zero-delay clock driver IC designed for registered DDR SDRAM DIMM applications. It accepts one differential clock input pair (CLK/CLK), distributes it to ten matched differential output pairs (Y0–Y9) plus one feedback pair (FBOUT/FBOUT), operates at 2.5 V or 2.6 V, supports spread-spectrum clocking up to 220 MHz, and features power-down control via LVCMOS PWRDWN pin for PC3200 memory systems.

For engineers reviewing the PI6CVF857AE datasheet, PI6CVF857AE pinout, PI6CVF857AE application, or PI6CVF857AE equivalent, key selection criteria include differential clock fanout count, PLL lock range (up to 220 MHz), low-skew performance (<75 ps skew), spread-spectrum compatibility, and 48-pin TSSOP package compatibility with DDR-SDRAM memory module layouts.

Technical Context

The PI6CVF857AE implements a phase-locked loop architecture that synchronizes ten differential clock outputs and one feedback output to the CLK/CLK reference using external FBIN/FBIN feedback path. Its PLL achieves sub-100 ps cycle-to-cycle jitter and static phase offset under 130 ps across PC1600–PC3200 frequency bands.

It integrates dual power domains: AVDD (2.5 V or 2.6 V analog supply) and VDDQ (2.5 V digital I/O supply), with independent power-down logic triggered by either the LVCMOS PWRDWN pin or AVDD strap. Low-power mode activates automatically below 20 MHz input frequency, disabling PLL and tri-stating outputs.

Key Specifications

Pinout & Package

PI6CVF857AE is housed in a Pb-free, RoHS-compliant 48-pin TSSOP (Package Code A), 12.6 mm × 6.2 mm body, 0.5 mm pitch, with exposed thermal pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT 85411BGILF and ON Semi NB3N502DG, the PI6CVF857AE uniquely combines 10-output DDR2-optimized fanout, integrated FBIN/FBOUT feedback for DIMM-specific deskew, AVDD-strappable PLL bypass, and production-validated spread-spectrum tolerance-making it the only drop-in solution for JEDEC-compliant PC3200 registered DIMMs.

Availability

PI6CVF857AE is available at Aetrix Electronics and suitable for registered DDR2 DIMM manufacturing, server memory subsystem integration, and industrial embedded memory module design requiring stable component supply and long-term lifecycle support.

Supply support for PI6CVF857AE 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

Pericom Semiconductor (now part of Diodes Incorporated) is a fabless provider of high-performance interface, timing, and signal integrity solutions for computing, communications, and consumer electronics.

The PI6CVF857AE belongs to Pericom's DDR clock buffer product line, engineered specifically to meet JEDEC timing, skew, and power requirements of registered DDR SDRAM memory modules.

FAQ

What is the purpose of the AVDD pin on the PI6CVF857AE?

The AVDD pin supplies the analog PLL core and must be set to 2.5 V for PC1600–PC2700 operation or 2.6 V for PC3200. Strapping AVDD low disables and bypasses the PLL for test-mode operation, allowing direct clock pass-through without phase alignment-critical for board-level debug and failure analysis.

Does the PI6CVF857AE support spread-spectrum clocking (SSC)?

Yes, the PI6CVF857AE is explicitly designed to track and regenerate spread-spectrum clock inputs with ±0.5% modulation depth. Its PLL architecture maintains low jitter and skew even under SSC, reducing electromagnetic interference in high-speed DDR2 memory channels without requiring system-level SSC disable.

How does the automatic low-power mode function?

The PI6CVF857AE detects input clock frequencies below 20 MHz using an internal frequency detector. When triggered, it disables the PLL, shuts down input receivers, and places all differential outputs in high-impedance state-achieving ultra-low quiescent current without requiring assertion of the PWRDWN pin.

Can the PI6CVF857AE be used in DDR3 applications?

No. The PI6CVF857AE is optimized for DDR2 registered DIMMs (PC1600–PC3200) with 2.5 V/2.6 V supplies and 220 MHz max lock range. DDR3 requires different voltage levels (1.5 V), higher frequencies (>400 MHz), and updated timing parameters; use IDT 85411 or similar DDR3-qualified clock drivers instead.