W48S87-04
W48S87-04 is Spread Spectrum 3 DIMM Desktop Clock manufactured by IC WORKS.
Features
- Outputs
- 4 CPU Clock (2.5V or 3.3V, 50 to 83.3MHz)
- 7 PCI (3.3V)
- 1 48MHz for USB (3.3V)
- 1 24MHz for Super I/O (3.3V)
- 2 REF (3.3V)
- 1 IOAPIC (2.5V or 3.3V)
- 12 SDRAM
- Serial data interface provides additional frequency selection, individual clock output disable, and other functions
- Smooth transition supports dynamic frequency assignment
- Frequency selection not affected during power down/up cycle
- Supports a variety of power saving options
- 3.3V operation
- Available in 48-pin SSOP (300 mils)
Key Specifications
±0.5% Spread Spectrum Modulation:
±0.5%
Jitter (cycle-to-cycle):
250ps
Duty Cycle:
45-55% 1-4ns CPU-PCI skew 250ps PCI-PCI or CPU-CPU skew
Figure 1 Block Diagram
SDATA SCLOCK X1 X2 CPU3.3#_2.5 FS0 FS1 FS2
CPU_STOP#
PWR_DWN#
Serial Port XTAL OSC
Device Control
PLL Ref Freq
VDD1
CPU Clock Mode Control
Freq Select
I/O MODE
REF0/CPU3.3#_2.5...
