The 8T49N240 has one fractional-feedback PLL that can be used as a frequency translator with jitter attenuation or a frequency synthesizer. It is equipped with three integer and one fractional output dividers, allowing the generation of up to two different  output frequencies, ranging from 8kHz to 1GHz. Output frequencies can be completely independent of the input frequencies, two of these frequencies can be completely independent of each other and the other two will be integer-related to one of the other two frequencies. The four outputs may select among LVPECL, LVDS, HCSL or LVCMOS output levels.

The 8T49N240 is ideal for use in a wide range of equipment, including 10G/40G/100G SONET/SDH and Ethernet network line cards, wireless base station baseband units, broadcast video, carrier Ethernet switches, OTN, or in test and measurement applications. For example, the 8T49N240 can be used in GbE/10GbE/100GbE Synchronous Ethernet line card applications in order to preserve the G.8262 compliance from the Synchronous Equipment Timing Source (SETS) on the timing card. The 8T49N240 provides a 200fs (typical, 12kHz to 20MHz) RMS jitter performance that provides users with additional margin in their designs.

IDT’s third generation Universal Frequency Translator family also includes the 8T49N241 (2-in / 1-PLL / 4-out), 8T49N242 (2-in / 1-PLL / 4-out), the 8T49N285 (2-in / 1-PLL / 8-out), the 8T49N286 (4-in / 2-PLL / 8-out) and the 8T49N287 (2-in / 2-PLL / 8-out). These devices are complemented by the 82P33714 and 82P33731 synchronous equipment timing source (SETS) for Synchronous Ethernet (SyncE) and 10G-40G SyncE, respectively.

To see other devices in this product family, visit the Universal Frequency Translators page.


  • Compliant with the requirements outlined in Telcordia GR-253-CORE (SONET) & ITU-T G.813/G.8262 (SDH/SONET & SyncE) when paired with a Synchronous Equipment Timing Source (SETS ) device
  • Generates up to 4 LVPECL / LVDS / HCSL or 16 LVCMOS output clocks ranging from 8kHz up to 1.0GHz (diff), 8kHz to 250MHz (LVCMOS), that meet jitter limits for 10G up to 25G Ethernet applications
  • 0.2ps RMS (including spurs), 12kHz to 20MHz
  • Accepts up to two LVPECL, LVDS, LVHSTL, HCSL or LVCMOS input clocks ranging from 8kHz up to 875MHz
  • Auto and manual input clock selection with hitless switching
  • Clock input monitoring, including support for gapped clocks
  • Phase-Slope Limiting and Fully Hitless Switching options to control output phase transients
  • Operates from a 25MHz to 50MHz crystal
  • Register programmable through I²C or via external I²C EEPROM
  • 8T49N240-991 “Boot from EEPROM”
  • 8T49N240-994 “powers up disabled”
  • Supported by IDT Timing Commander Software™


This device is factory-configurable. Try the Custom Part Configuration Utility.
製品名 Part Status Pkg. Type Lead Count (#) Temp. Grade Carrier Type Description 購入/サンプル
Active VFQFPN 40 I Tray Boot from EEPROM
Active VFQFPN 40 I Reel Boot from EEPROM
Active VFQFPN 40 I Tray Powers up disabled
Active VFQFPN 40 I Reel Powers up disabled


タイトル language 分類 形式 サイズ 日付
star 8T49N240 Datasheet データシート PDF 1.80 MB
8T49N240-991 Datasheet Addendum データシート PDF 164 KB
8T49N240-994 Datasheet Addendum データシート PDF 153 KB
FemtoNG Universal Frequency Translator Ordering Product Information Guide マニュアル-ハードウェア PDF 270 KB
8T49N24x Evaluation Board User Guide マニュアル-ハードウェア PDF 1.41 MB
Timing Commander Installation Guide ガイド PDF 497 KB
App Note 932 - Description for Startup and Calibration for UFT3G Family アプリケーションノート PDF 604 KB
8T49N24x EEPROM Programming Guide アプリケーションノート PDF 593 KB
8T49N24x Power-Up Configuration Guide アプリケーションノート PDF 175 KB
AN-828 Termination - LVPECL アプリケーションノート PDF 322 KB
8T49N24x Frequency Programming Guide アプリケーションノート PDF 198 KB
AN-893 8T49N241_2 Frequency Synchronization Compliance Report アプリケーションノート PDF 1.11 MB
AN-831 The Crystal Load curve アプリケーションノート PDF 395 KB
AN-844 Termination - AC Coupling Clock Receivers アプリケーションノート PDF 170 KB
AN-845 Termination - LVCMOS アプリケーションノート PDF 146 KB
AN-846 Termination - LVDS アプリケーションノート PDF 133 KB
AN-842 Thermal Considerations in Package Design and Selection アプリケーションノート PDF 495 KB
AN-840 Jitter Specifications for Timing Signals アプリケーションノート PDF 442 KB
AN-838 Peak-to-Peak Jitter Calculations アプリケーションノート PDF 115 KB
AN-839 RMS Phase Jitter アプリケーションノート PDF 233 KB
AN-832 Timing Budget and Accuracy アプリケーションノート PDF 131 KB
AN-833 Differential Input Self Oscillation Prevention アプリケーションノート PDF 180 KB
AN-834 Hot-Swap Recommendations アプリケーションノート PDF 153 KB
AN-835 Differential Input with VCMR being VIH Referenced アプリケーションノート PDF 160 KB
AN-836 Differential Input to Accept Single-ended Levels アプリケーションノート PDF 120 KB
AN-830 Quartz Crystal Drive Level アプリケーションノート PDF 143 KB
AN-815 Understanding Jitter Units アプリケーションノート PDF 565 KB
AN-827 Application Relevance of Clock Jitter アプリケーションノート PDF 1.15 MB
AN-802 Crystal-Measuring Oscillator Negative Resistance アプリケーションノート PDF 136 KB
AN-801 Crystal-High Drive Level アプリケーションノート PDF 202 KB
AN-805 Recommended Ferrite Beads アプリケーションノート PDF 121 KB
AN-806 Power Supply Noise Rejection アプリケーションノート PDF 438 KB
AN-803 Crystal Timing Budget and Accuracy for Renesas Timing Clock Products アプリケーションノート PDF 108 KB
PCN# : A1904-01 Add Greatek, Taiwan as an Alternate Assembly Facility 製品変更通知 PDF 983 KB
PCN#: TP1901-01 Datasheet Correction for I2C Read Sequence Diagrams for the UFT Product Family 製品変更通知 PDF 454 KB
PCN# : N1807-01 Die revisionc change, 8T49N240, 8T49N242 製品変更通知 PDF 21 KB
8T49N24x Schematics Review Checklist 回路図 XLSX 550 KB
8T49N240 Sub-200fs Universal Frequency Translator 製品概要 PDF 322 KB
IDT Clock Generation Overview (Japanese) English 概要 PDF 2.19 MB
IDT Clocks for Xilinx Ultrascale FPGAs 技術概要 PDF 256 KB
IDT Clocks for Altera's Stratix V and Arria V/X FPGAs 技術概要 PDF 238 KB
IDT Clocks for SMPTE and Xilinx® 7 Series FPGAs 技術概要 PDF 566 KB
82P33714/31 SETS and 8T49N24x Universal Frequency Translators Product Brief 製品概要 PDF 370 KB
8T49N24x EVB Schematic 回路図 PDF 74 KB
IDT Jitter Attenuator Product Overview 简体中文 概要 PDF 1.95 MB


タイトル language 分類 形式 サイズ 日付
8T49N24x Timing Commander Personality File (v1.7.3) ソフトウェアツール ZIP 6.71 MB
Timing Commander Installer (v1.16.4) ソフトウェア/ツール-その他 ZIP 19.79 MB
8T49N240 IBIS Model モデル-IBIS ZIP 331 KB
8T49N24x Design Files (Schematic Symbol and PCB Footprint) PCB設計ファイル ZIP 12 KB


製品名 タイトル 分類 Company
8T49N240-EVK Evaluation Kit for 8T49N240 Evaluation Renesas