| Symbol | Description | Conditions | All Speed Grades | Units | ||
|---|---|---|---|---|---|---|
| Min | Typ | Max | ||||
| FGCLK | Reference clock frequency range | 60 | – | 820 | MHz | |
| TRCLK | Reference clock rise time | 20% – 80% | – | 200 | – | ps |
| TFCLK | Reference clock fall time | 80% – 20% | – | 200 | – | ps |
| TDCREF | Reference clock duty cycle | Transceiver PLL only | 40 | 50 | 60 | % |