Rambus™ XDR™Clock Generator

The 9214 clock generator provides the necessary clock signals to support the Rambus XDRTM memory subsystem and Redwood logic interface. The clock source is a reference clock that may or may not be modulated for spread spectrum. The 9214 provides 4 differential clock pairs in a space saving 28-pin TSSOP package and provides an off-the-shelf high-performance interface solution. Figure 1 shows the major components of the 9214 XDR Clock Generator. These include the a PLL, a Bypass Multiplexer and four differential output buffers. The outputs can be disabled by a logic low on the OE pin. An output is enabled by the combination of the OE pin being high, and 1 in its SMBus Output control register bit. The PLL receives a reference clock, CLK_INT/C and outputs a clock signal at a frequency equal to the input frequency times a multiplier. Table 2 shows the multipliers selectable via the SMBus interface. This clock signal is then fed to the differential output buffers to drive the enabled clocks. Disabled outputs are set to Hi-Z. The Bypass mode routes the input clock, CLK_INT/C, directly to the differential output buffers, bypassing the PLL. Up to four 9214 devices can be cascaded on the same SMBus. Table 3 shows the SMBus addressing and control for the four devices.

Features

  • 400 - 500 MHz clock source
  • 4 open-drain differential output drives with short term jitter < 40ps
  • Spread spectrum compatible
  • Reference clock is differential or single-ended, 100 or 133 MHz
  • SMBus programmability for: - frequency multiplier - output enable - operating mode
  • Supports frequency multipliers of: 3, 4, 5, 6, 8, 9/2, 15/2 and 15/4
  • Support systems where XDR subsystem is asynchronous to other system clocks
  • 2.5V power supply

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
9214DGLF Active PGG28 TSSOP 28 C Yes Tube Availability
9214DGLFT Active PGG28 TSSOP 28 C Yes Reel Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
ics9214 Datasheet PDF 229 KB Jun 2, 2008
PCNs & PDNs
PCN# : A1602-01(R1) Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Apr 13, 2016
PCN# : A1602-01 Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Feb 14, 2016
PCN# : A1511-01(R1) Add SPEL India as Alternate Assembly Location Product Change Notice PDF 596 KB Jan 27, 2016
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location Product Change Notice PDF 544 KB Nov 12, 2015
PCN# : TB1504-01R1 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 95 KB Oct 21, 2015
PCN# : TB1504-01 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 50 KB Jul 20, 2015
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB Mar 23, 2013
PCN# : A1208-01R1 Gold to Copper Wire Product Change Notice PDF 254 KB Dec 20, 2012
PDN# : U-11-11 PRODUCT DISCONTINUANCE NOTICE ON SELECTED MICRO CLOCK DEVICES Product Delete Notice PDF 69 KB Sep 5, 2011

Software & Tools

Title Other Languages Type Format File Size Date
9214 IBIS Model Model - IBIS ZIP 8 KB Mar 22, 2006