Overview
Description
The 9FGL6251 is an intelligent buffer/clock generator tailored for single and dual-ported nVME SSDs. It supports Common (CC) and Independent Reference (IR) clocking architectures and is ideal for U.2 and M.2 form factors. The device is also useful in PCIe master/slave and clock multiplexing applications, with an internal clock generator as a third input channel.
For information regarding evaluation boards and material, please contact your local sales representative.
Features
- Automatically detects the presence or absence of input clocks and switches clock modes
- One open-drain CC_IR output indicates PCIe clock mode
- Integrated crystal option available (Q option)
- Two 100MHz Low-power HCSL (LP-HCSL) outputs; 85Ω output impedance
- Integrated terminations on DIF outputs save 8 resistors
- 201, 301 configurations for SRnS (IR) or CC architectures default to 0% SSC
- 202, 302 configurations for SRIS (IR) or CC architectures default to -0.5% SSC
- SMBus-selectable -0.25% SSC
- Choice of 25MHz or 33 1/3MHz reference clock
- REF clock output saves external XO
- 2.5V or 3.3V operating voltage (VDDREF is 1.8V)
- 4mm × 4mm 28-VQFP-N package with external crystal
- 4mm × 4mm 28-LGA package with optional internal crystal
- Easy AC coupling to other logic families, see application note AN-891
- For devices with 100Ω output impedance, see 9FGL6241
Comparison
Applications
- 1 × 4 and 2 × 2 nVME SSDs
- 3:2 PCIe clock multiplexing
Design & Development
Software & Tools
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.
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Videos & Training
PCIe Reference Clock Jitter Budgets
Ron Wade, chief PCIe system architect explains the fundamental difference in reference clock jitter budgets between the first three generations of the specification and those of Gen4 and Gen5 which raise new challenges for designers.
Related Resources
Video List
