9ZXL1251E

12-Output DB1200ZL for PCIe Gen1–4 and UPI 9ZXL1231E / 9ZXL1251E Datasheet Description The 9ZXL1231E / 9ZXL1251E are second-generation, enhanced performance DB1200ZL differential buffers. The parts are pin-compatible upgrades to the 9ZXL1231A and 9ZXL1251A, while offering much improved phase jitter performance and increased system security features. A fixed external feedback maintains low drift for critical QPI/UPI applications. PCIe Clocking Architectures Supported ▪ Common Clocked (CC) ▪ Independent Reference (IR) with and without spread spectrum Typical Applications ▪ Servers ▪ Storage ▪ Networking ▪ SSDs Output Features ▪ 12 Low-Power (LP) HCSL output pairs (1231E) ▪ 12 Low-Power (LP) HCSL output pairs with 85Ω Zout (1251E) Block Diagram VDDR VDDA Features ▪ LP-HCSL outputs; eliminate 24 resistors, save 41mm2 of area (1231E) ▪ LP-HCSL outputs with 85Ω Zout; eliminate 48 resistors, save 82mm2 of area (1251E) ▪ 12 OE# pins; hardware control of each o...