概览
描述
The 9ZXL1950 is a DB1900Z derivative buffer utilizing Low-Power HCSL (LP-HCSL) outputs to increase edge rates on long traces, reduce board space, and reduce power consumption by more than 50% from the original 9ZX21901. It is pin-compatible with the 9ZXL1930 and fully integrates the output terminations. The 9ZXL1950 is suitable for PCI Express Gen 1/2/3 or QPI/UPI applications and uses fixed external feedback to maintain low drift for demanding QPI/UPI applications.
特性
- 19 LP-HCSL differential output pairs with integrated terminations (Zo = 85Ω)
- LP-HCSL outputs; up to 90% IO power reduction, better signal integrity over long traces
- Direct connect to 85Ω transmission lines; eliminates 76 termination resistors, saves 130mm² area
- Pin compatible with the 9ZXL1930; easy upgrade to reduced board space
- 72-VFQFPN package; smallest 19 output Z-buffer
- Fixed feedback path; ~0ps input-to-output delay
- 9 selectable SMBus addresses; multiple devices can share the same SMBus segment
- Separate VDDIO for outputs; allows maximum power savings
- PLL or bypass mode; PLL can de-jitter incoming clock
- 100MHz and 133.33MHz PLL mode; legacy QPI support
- Selectable PLL BW; minimizes jitter peaking in downstream PLLs
- Spread spectrum compatible; tracks spreading input clock for EMI reduction
- SMBus interface; unused outputs can be disabled
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