W83L197R-16中文资料华邦电子数据手册PDF规格书

GENERAL DESCRIPTION

The W83L197R-16 is a Clock Synthesizer which provides all clocks required for high-speed RISC or CISC microprocessor. Four different frequency of CPU, and PCI clocks are externally selectable with smooth transitions. The 0.5 or 0.75 center type spread spectrum can be selected to reduce EMI.

PRODUCT FEATURES

• Supports Pentium II CPUs

• 4 sets of CPU frequencies selection

• 2 CPU clocks (one free running CPU clock)

• 6 PCI synchronous clocks(one free running PCI clock)

• Optional single or mixed supply:

(Vdd3 = VddC= 3.3V±5) or (VddC = 2.5V±5)

• Skew form CPU to PCI clock 1.5 to 4.0 ns, CPU leads.

• CPU clock jitter less than 200ps

• PCI_F,PCI1:6 clock skew less than 500ps

• ¡Ó0.5 or ¡Ó0.75 center type spread spectrum function to reduce EMI

• Programmable registers to enable/stop each output and select modes

(mode as Tri-state or Normal )

• 48 MHz for USB

• 28-pin SOP package (209mil)