845264I中文资料FemtoClock® Crystal-to-CML Clock Generator数据手册Renesas规格书

描述 Description

The ICS845264I is a 3.3V, 2.5V CML clock generator designed for Ethernet applications. The device synthesizes four clock frequencies on two separately selectable output banks. Each bank has either a 62.5MHz, 125MHz, 156.25MHz or 312.5MHz clock signal with excellent phase jitter performance. Each clock frequency is distributed to two low-skew differential CML output banks with a total of four outputs. The device is suitable for driving the reference clocks of Ethernet PHYs. The device supports 3.3V and 2.5V voltage supply and is packaged in a small, lead-free (RoHS 6) 32-lead VFQFN package. The extended temperature range supports telecommunication, wireless infrastructure and networking end equipment requirements.

特性 Features

·Clock generation of: 62.5MHz, 125MHz, 156.25MHz and 312.5MHz
·Two banks of two differential CML clock outputs
·Crystal interface designed for 25MHz, 12pF parallel resonant crystal
·RMS phase jitter @ 125MHz, using a 25MHz crystal (1.875MHz – 20MHz): 0.486ps (typical)
·Offset Single-side Band Phase Noise
100Hz ............................-97 dBc/Hz1kHz...............................-118 dBc/Hz10kHz.............................-125 dBc/Hz100kHz...........................-123 dBc/Hz·LVCMOS interface levels for the control inputs
·Full 3.3V and 2.5V supply voltage
·Lead-free (RoHS 6) 32 VFQFN packaging
·-40°C to 85°C ambient operating temperature