The 9FGL6251 is an intelligent buffer/clock generator tailored for single and dual-ported nVME SSDs. It supports Common (CC) and Independent Reference (IR) clocking architectures and is ideal for U.2 and M.2 form factors. The device is also useful in PCIe master/slave and clock multiplexing applications, with an internal clock generator as a third input channel.
 
For information regarding evaluation boards and material, please contact your local IDT sales representative.
 

Features

  • Automatically detects presence or absence of input clocks and switches clock modes
  • One open-drain CC_IR output indicates PCIe clock mode
  • Integrated crystal option available (Q option)
  • Two 100MHz Low-power HCSL (LP-HCSL) outputs; 85Ω output impedance
  • Integrated terminations on DIF outputs save 8 resistors
  • 201, 301 configurations for SRnS (IR) or CC architectures default to 0% SSC
  • 202, 302 configurations for SRIS (IR) or CC architectures default to -0.5% SSC
  • SMBus-selectable -0.25% SSC
  • Choice of 25MHz or 33 1/3MHz reference clock
  • REF clock output saves external XO
  • 2.5V or 3.3V operating voltage (VDDREF is 1.8V)
  • 4 × 4 mm 28-VQFP-N package with external crystal
  • 4 × 4 mm 28-LGA package with optional internal crystal
  • Easy AC-coupling to other logic families, see IDT application note AN-891
  • For devices with 100Ω output impedance, see 9FGL6241

Product Options

Orderable Part ID Part Status Pkg. Type Lead Count (#) Description Output Impedance Temp. Grade Carrier Type Package Buy Sample
9FGL6251AP201NDGI Active VFQFPN 28 25MHz external XTAL, SSC off (SRNS) 85 I Tray Package Info
Availability
9FGL6251AP201NDGI8 Active VFQFPN 28 25MHz external XTAL, SSC off (SRNS) 85 I Reel Package Info
Availability
9FGL6251AP202NDGI Active VFQFPN 28 25MHz external XTAL, SSC on (SRIS) 85 I Tray Package Info
Availability
9FGL6251AP202NDGI8 Active VFQFPN 28 25MHz external XTAL, SSC on (SRIS) 85 I Reel Package Info
Availability
9FGL6251AP301NDGI Active VFQFPN 28 33.33MHz external XTAL, SSC off (SRNS) 85 I Tray Package Info
Availability
9FGL6251AP301NDGI8 Active VFQFPN 28 33.33MHz external XTAL, SSC off (SRNS) 85 I Reel Package Info
Availability
9FGL6251AP302NDGI Active VFQFPN 28 33.33MHz external XTAL, SSC on (SRIS) 85 I Tray Package Info
Availability
9FGL6251AP302NDGI8 Active VFQFPN 28 33.33MHz external XTAL, SSC on (SRIS) 85 I Reel Package Info
Availability
9FGL6251AQ201LTGI Active LGA 28 25MHz internal XTAL, SSC off (SRNS) 85 I Tray Package Info
Availability
9FGL6251AQ201LTGI8 Active LGA 28 25MHz internal XTAL, SSC off (SRNS) 85 I Reel Package Info
Availability
9FGL6251AQ202LTGI Active LGA 28 25MHz internal XTAL, SSC on (SRIS) 85 I Tray Package Info
Availability
9FGL6251AQ202LTGI8 Active LGA 28 25MHz internal XTAL, SSC on (SRIS) 85 I Reel Package Info
Availability
9FGL6251AQ301LTGI Active LGA 28 33.33MHz internal XTAL, SSC off (SRNS) 85 I Tray Package Info
Availability
9FGL6251AQ301LTGI8 Active LGA 28 33.33MHz internal XTAL, SSC off (SRNS) 85 I Reel Package Info
Availability
9FGL6251AQ302LTGI Active LGA 28 33.33MHz internal XTAL, SSC on (SRIS) 85 I Tray Package Info
Availability
9FGL6251AQ302LTGI8 Active LGA 28 33.33MHz internal XTAL, SSC on (SRIS) 85 I Reel Package Info
Availability

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
9FGL6241_6251 Datasheet Datasheet PDF 562 KB
User Guides & Manuals
Timing Products for NXP (Freescale) i.MX 简体中文 Guide PDF 321 KB
9FGx08 PCIe Clock Generator Evaluation Boards User Guide Manual - Eval Board PDF 838 KB
Application Notes & White Papers
AN-975 Cascading PLLs Application Note PDF 255 KB
AN-891 Driving LVPECL, LVDS, CML, and SSTL Logic with IDT?s ?Universal? Low-Power HCSL Outputs Application Note PDF 480 KB
AN-879 Low-Power HCSL vs Traditional HCSL Application Note PDF 235 KB
AN-843 PCI Express Reference Clock Requirements Application Note PDF 1.90 MB
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 495 KB
AN-840 Jitter Specifications for Timing Signals Application Note PDF 442 KB
AN-839 RMS Phase Jitter Application Note PDF 233 KB
AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 120 KB
AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 160 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.15 MB
AN-815 Understanding Jitter Units Application Note PDF 565 KB
AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 136 KB
AN-805 Recommended Ferrite Beads Application Note PDF 121 KB
PCNs & PDNs
PCN# : TB1912-02 Convert Shipping Media
from Tube or Tray to Cut Reel
Product Change Notice PDF 5.61 MB
PCN# : A1904-01 Add Greatek, Taiwan as an Alternate Assembly Facility Product Change Notice PDF 983 KB
PCN# : MM1610-01 Improve performance to meet the new PCIe Product Change Notice PDF 23 KB
Downloads
Software for PCIe Evaluation Kits Software ZIP 440 KB
Other
PCI Express Timing Solutions Overview Overview PDF 275 KB
Timing Solutions Products Overview Overview PDF 4.11 MB
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB