Overview
Description
The 9ZX21901D is a second-generation DB1900Z differential buffer for Intel Purley and newer platforms. The part is backward compatible with the 9ZX21901C while offering much-improved phase jitter performance. Fixed external feedback maintains low drift for critical QPI/UPI applications. In bypass mode, the 9ZX21901D can provide outputs up to 400MHz.
Features
- 19 HCSL output pairs
- Fixed feedback path
- Phase jitter: PCIe Gen 4 < 0.5ps rms
- Phase jitter: UPI 9.6GT/s < 0.1ps rms
- PLL or bypass mode; PLL can de-jitter incoming clock
- 9 selectable SMBus Addresses
- 8 dedicated OE# pins
- 100MHz or 133MHz PLL mode; legacy QPI support
- Selectable PLL bandwidth; minimizes jitter peaking in downstream PLLs
- Spread spectrum compatible
- SMBus interface
- 10mm × 10mm 72-QFN package
Comparison
Applications
Design & Development
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.
Processing table
| VFQFPN | 72 | C | Yes | Tray | 3 | 4.072 | Get Samples, | |
| VFQFPN | 72 | C | Yes | Reel | 3 |
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