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概要

The 8T49N028 is a low RMS phase jitter Clock Synthesizer with selectable internal crystal oscillator or external clock references and eight outputs, configurable as either LVDS, LVPECL or High Impedance.
 
After power up, two frequency select pins determine one of up to four different sets of factory preprogrammed crystal or input frequency and output frequency configurations. From a single input reference, as many as three different output frequencies may be selected for the output banks: two of these frequencies can be generated by the internal crystal oscillator, and/or external clock pre-divider, and/or A output divider, and/or B output divider. The third output frequency is from the B output divider. Device pre-programming can be overwritten through the provided I2C interface.
 
Examples of valid frequency configuration setups illustrate this device's flexibility, and are shown in Table 3A. The specific internal register settings for each of the four frequency sets are specified by a Renesas order code. Custom codes can be provided by contacting Renesas.
 
8T49N028I - Block Diagram
8T49N028I - Pin Assignment
8T49N028I - Block Diagram
8T49N028I - Pin Assignment
  • Fourth Generation FemtoClock NG PLL technology
  • Eight selectable LVPECL or LVDS outputs (bank selectable, two output channels per bank)
  • CLK, nCLK input pair can accept the following differential input levels: LVPECL, LVDS, HCSL
  • FemtoClock NG VCO Range: 1.92GHz–2.5GHz
  • Bank A and B output frequencies are mux selectable from internal crystal oscillator, reference clock input, output divider A or output divider B
  • Clock from OUTPUT DIVIDER A, RMS phase jitter at 156.25MHz
    (12KHz–20MHz): 225fs (typical)
  • Clock from OUTPUT DIVIDER B, RMS phase jitter at 156.25MHz
    (12KHz–20MHz): 219fs (typical)
  • Clock from OUTPUT DIVIDER B, RMS phase jitter at 156.25MHz
    (10kHz–1MHz): 165fs (typical) Full 2.5V or 3.3V power supply
  • Full 2.5V or 3.3V power supply
  • I2C programming interface
  • PCI Express (2.5Gb/S), Gen2 (5Gb/s) and Gen3 (8Gb/s) jitter compliant
  • -40°C to 85°C ambient operating temperature
  • Lead-free (RoHS 6) packaging

ドキュメント

タイトル 分類 日付
8T49N028 Datasheet
PDF1.62 MB
データシート
AN-805 Recommended Ferrite Beads
PDF91 KB
アプリケーションノート
AN-827 Application Relevance of Clock Jitter
PDF1.99 MB
アプリケーションノート
AN-828 Termination - LVPECL
PDF322 KB
アプリケーションノート
AN-831 The Crystal Load curve
PDF395 KB
アプリケーションノート
AN-844 Termination - AC Coupling Clock Receivers
PDF170 KB
アプリケーションノート
AN-846 Termination - LVDS
PDF133 KB
アプリケーションノート
AN-842 Thermal Considerations in Package Design and Selection
PDF495 KB
アプリケーションノート
AN-840 Jitter Specifications for Timing Signals
PDF442 KB
アプリケーションノート
AN-838 Peak-to-Peak Jitter Calculations
PDF115 KB
アプリケーションノート
AN-839 RMS Phase Jitter
PDF233 KB
アプリケーションノート
AN-832 Timing Budget and Accuracy
PDF131 KB
アプリケーションノート
AN-833 Differential Input Self Oscillation Prevention
PDF180 KB
アプリケーションノート
AN-834 Hot-Swap Recommendations
PDF153 KB
アプリケーションノート
AN-835 Differential Input with VCMR being VIH Referenced
PDF160 KB
アプリケーションノート
AN-836 Differential Input to Accept Single-ended Levels
PDF120 KB
アプリケーションノート
AN-837 Overdriving the Crystal Interface
PDF133 KB
アプリケーションノート
AN-830 Quartz Crystal Drive Level
PDF143 KB
アプリケーションノート
AN-815 Understanding Jitter Units
PDF565 KB
アプリケーションノート
AN-802 Crystal-Measuring Oscillator Negative Resistance
PDF136 KB
アプリケーションノート
AN-801 Crystal-High Drive Level
PDF202 KB
アプリケーションノート
AN-806 Power Supply Noise Rejection
PDF438 KB
アプリケーションノート
AN-803 Crystal Timing Budget and Accuracy for Renesas Timing Clock Products
PDF108 KB
アプリケーションノート
Programmable FemtoClock Ordering Product Information
PDF140 KB
マニュアル－ハードウェア
PCN# : A1904-01 Add Greatek, Taiwan as an Alternate Assembly Facility
PDF983 KB
製品変更通知
PCN# : A1611-02 Add JCET China as Alternate Assembly and Change of Material Set at Alternate Assembly Location
PDF583 KB
製品変更通知
PCN# : W1308-01 Change of Passivation Thickness
PDF941 KB
製品変更通知

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    Processing table
    型名
    Pkg. Type
    Lead Count (#)
    Temp. Grade
    Pb (Lead) Free
    Carrier Type
    ご購入 / サンプル
    8T49N028-001NLGI
    play_circleActive
    memory
    view_in_ar
    サンプル入手可能
    		 48 I Yes Tray サンプルを入手,
    8T49N028-001NLGI8
    play_circleActive
    memory
    view_in_ar
    		48 I Yes Reel
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