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NB4N121KMNGEVB Fiches technique(PDF) 1 Page - ON Semiconductor |
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1 / 9 page © Semiconductor Components Industries, LLC, 2012 April, 2012 − Rev. 6 1 Publication Order Number: NB4N121K/D NB4N121K 3.3V Differential 1:21 Differential Fanout Clock Driver with HCSL level Output Description The NB4N121K is a Clock differential input fanout distribution 1 to 21 HCSL level differential outputs, optimized for ultra low propagation delay variation. The NB4N121K is designed with HCSL clock distribution for FBDIMM applications in mind. Inputs can accept differential LVPECL, CML, or LVDS levels. Single−ended LVPECL, CML, LVCMOS or LVTTL levels are accepted with the proper VREFAC supply (see Figures 5, 10, 11, 12, and 13). Clock input pins incorporate an internal 50 W on die termination resistors. Output drive current at IREF (Pin 1) for 1X load is selected by connecting to GND. To drive a 2X load, connect IREF to VCC. See Figure 9. The NB4N121K specifically guarantees low output–to–output skews. Optimal design, layout, and processing minimize skew within a device and from device to device. System designers can take advantage of the NB4N121K’s performance to distribute low skew clocks across the backplane or the motherboard. Features • Typical Input Clock Frequency 100, 133, 166, 200, 266, 333 and 400 MHz • 340 ps Typical Rise and Fall Times • 800 ps Typical Propagation Delay • Dtpd 100 ps Maximum Propagation Delay Variation Per Each Differential Pair • Additive Phase RMS Jitter: 1 ps Max • Operating Range: VCC = 3.0 V to 3.6 V with VEE = 0 V • Differential HCSL Output Level (700 mV Peak−to−Peak) • Pb−Free Packages are Available A = Assembly Site WL = Wafer Lot YY = Year WW = Work Week G = Pb−Free Package *For additional marking information, refer to Application Note AND8002/D. QFN−52 MN SUFFIX CASE 485M MARKING DIAGRAM* http://onsemi.com NB4N 121K AWLYYWWG 1 52 Figure 1. Pin Configuration (Top View) Q0 Q0 Q1 Q1 Q19 Q19 Q20 Q20 CLK CLK VCC GND RREF IREF See detailed ordering and shipping information in the package dimensions section on page 8 of this data sheet. ORDERING INFORMATION VTCLK VTCLK 152 |
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