NB3N1900K 3.3V 100/133 MHz Differential 1:19 HCSL Clock ZDB/Fanout Buffer for PCIe www.onsemi.com Description MARKING The NB3N1900K differential clock buffers are designed to work in DIAGRAM* conjunction with a PCIe compliant source clock synthesizer to provide pointtopoint clocks to multiple agents. The device is capable of 1 distributing the reference clocks for Intel QuickPath Interconnect 1 72 NB3N (Intel QPI & UPI), PCIe Gen1, Gen2, Gen3, Gen4. The NB3N1900K 1900K QFN72 internal PLL is optimized to support 100 MHz and 133 MHz MN SUFFIX AWLYYWWG frequency operation. The NB3N1900K supports HCSL output levels. CASE 485DK Features NB3N1900K = Specific Device Code A = Assembly Location Fixed Feedback Path for Lowest InputtoOutput Delay WL = Wafer Lot Eight Dedicated OE Pins for Hardware Control of Outputs YY = Year PLL Bypass Configurable for PLL or Fanout Operation WW = Work Week G = PbFree Package Selectable PLL Bandwidth Spread Spectrum Compatible: Tracks Input Clock Spreading for Low EMI ORDERING INFORMATION SMBus Programmable Configurations See detailed ordering and shipping information on page 20 of this data sheet. 100 MHz and 133 MHz PLL Mode to Meet the Next Generation PCIe Gen2/Gen3/Gen4 and Intel QPI & UPI Phase Jitter 2 TriLevel Addresses Selection (Nine SMBUS Addresses) CycletoCycle Jitter: < 50 ps OutputtoOutput Skew: < 65 ps InputtoOutput Delay: Fixed at 0 ps InputtoOutput Delay Variation: < 50 ps Phase Jitter: PCIe Gen3 < 1 ps rms Phase Jitter: PCIe Gen4 < 0.5 ps rms Phase Jitter: QPI 9.6GB/s < 0.12 ps rms QFN 72pin Package, 10 mm x 10 mm These are PbFree Devices Semiconductor Components Industries, LLC, 2017 1 Publication Order Number: January, 2019 Rev. 6 NB3N1900K/DNB3N1900K 8 OE 5:12 FB OUT FB OUT DIF 18:0 SSC Compatible MUX PLL DIF 18:0 CLK IN CLK IN 100M 133M HBW BYP LBW SA 0 Control SA 1 Logic PWRGD/PWRDN SDA SCL IREF NOTE: Even though the feedback is fixed FB OUT and FB OUT still needs a termination network for the part to function. Figure 1. Simplified Block Diagram of NB3N1900K www.onsemi.com 2