DESCRIPTION:

The CSPT857C is a PLL based clock driver that acts as a zero delay buffer

to distribute one differential clock input pair(CLK, CLK ) to 10 differential output

pairs (Y [0:9],Y [0:9]) and one differential pair of feedback clock output (FBOUT,

FBOUT). External feedback pins (FBIN, FBIN) for synchronization of the

outputs to the input reference is provided. A CMOS Enable/Disable pin is

available for low power disable. When the input frequency falls below

approximately 20MHz, the device will enter power down mode. In this mode,

the receivers are disabled, the PLL is turned off, and the output clock drivers

are tristated, resulting in a current consumption of less than 200μA.

The CSPT857C requires no external components and has been optimised

for very low I/O phase error, skew, and jitter, while maintaining frequency and

duty cycle over the operating voltage and temperature range. The CSPT857C,

designed for use in both module assemblies and system motherboard based

solutions, provides an optimum high-performance clock source.

The CSPT857C is available in Commercial Temperature Range (0°C to

+70°C) and Industrial Temperature Range (-40°C to +85°C). See Ordering

Information for details.

FEATURES:

• 1 to 10 differential clock distribution

• Optimized for clock distribution in DDR (Double Data Rate)

SDRAM applications

• Operating frequency: 60MHz to 220MHz

• Very low skew:

– <100ps for PC1600 - PC2700

– <75ps for PC3200

• Very low jitter:

– <75ps for PC1600 - PC2700

– <50ps for PC3200

• 2.5V AVDD and 2.5V VDDQ for PC1600-PC2700

• 2.6V AVDD and 2.6V VDDQ for PC3200

• CMOS control signal input

• Test mode enables buffers while disabling PLL

• Low current power-down mode

• Tolerant of Spread Spectrum input clock

• Available in 48-pin TSSOP, 40-pin VFQFPN, and 56-pin VFBGA

packages

CSPT857C属于集成电路（IC） > 应用特定时钟/定时。瑞萨科技有限公司制造生产的CSPT857C应用特定时钟/定时专用时钟和计时 IC（集成电路）产品族中的产品主要用于执行与时间或频率信息生成和分配相关的各种操作，适合的设计环境较特定，例如 AMD 和 Intel 的中央处理单元 (CPU) 或图形处理单元 (GPU)、DVD 音频设备、蓝光光盘播放器、以太网设备、PCIe、SATA、光纤通道接口、车载娱乐总线等。