W83L197R-16 Datasheet, PDF (1/11 Pages) Winbond – 2-CHIP 100MHZ CLOCK FOR BX NOTEBOOK

W83L197R-16
2-CHIP 100MHZ CLOCK FOR BX NOTEBOOK
1.0 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.
The W83L197R-16 accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply.
High drive PCI CLOCK outputs typically provide greater than 1 V /ns slew rate into 30 pF loads. CPU
CLOCK outputs typically provide better than 1 V /ns slew rate into 20 pF loads as maintaining 50¡Ó
5% duty cycle. The fixed frequency outputs as REF, 48 MHz provide better than 0.5V /ns slew rate.
2.0 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)
Publication Release Date: Mar. 1999
-1-
Revision 0.10