Description
The 9ZXL0631E / 9ZXL0651E are second-generation, enhanced-performance DB800ZL derivatives. The parts are pin-compatible upgrades to the 9ZXL0631A and 9ZXL0651A, while offering a much improved phase jitter performance. A fixed external feedback maintains low drift for critical QPI/UPI applications.

FEATUREs
▪ LP-HCSL outputs; eliminate 12 resistors, save 20mm2 of area (0631E)
▪ LP-HCSL outputs with 85Ω Zout; eliminate 24 resistors, save 48mm2 of area (0651E)
▪ 6 OE# pins; hardware control of each output
▪ Selectable PLL BW; minimizes jitter peaking in cascaded PLL topologies
▪ Hardware/SMBus control of PLL bandwidth and bypass; change mode without power cycle
▪ Spread spectrum compatible; tracks spreading input clock for EMI reduction
▪ 100MHz PLL Mode; UPI support
▪ 5 × 5 mm 40-QFN package; small board footprint

Output Features
▪ 6 Low-power HCSL (LP-HCSL) output pairs (0631E)
▪ 6 Low-power HCSL (LP-HCSL) output pairs with 85Ω Zout(0651E)

Key Specifications
▪ Cycle-to-cycle jitter < 50ps
▪ Output-to-output skew < 50 ps
▪ Input-to-output delay: fixed at 0ps
▪ Input-to-output delay variation < 50ps
▪ Phase jitter: PCIe Gen4 < 0.5ps rms
▪ Phase jitter: QPI/UPI > = 9.6GB/s < 0.2ps rms
▪ Phase jitter: IF-UPI < 1.0ps rms