ICS9248-78 Datasheet, PDF (12/13 Pages) Integrated Circuit Systems – Frequency Timing Generator for Pentium II Systems

ICS9248 - 78
Preliminary Product Preview
Group Offset Waveforms
Group Skews at Common Transition Edges:
CPU & IOAPIC load (lumped) = 20pf; PCI, SDRAM, 3V66 LOAD (LUMPED) = 30pf.
GROUP
SYMBOL
CONDITIONS
MIN
CPU (at 66MHz) to
3V66
S_CPU1-3V66
CPU @ 1.25V, 3V66 @ 1.5V (Note: 180°
offset between CPU & 3V66
0
CPU (at 100MHz) to
SDRAM
S_CPU2-SDRAM
CPU @ 1.25V, SDRAM @ 1.5V (Note: 180°
offset between CPU & 66MHz
0
3V66 to PCI
S_3V66-PCI 3V66 @ 1.5V, PCI @ 1.5V
1.5
IOAPIC to PCI
S_IOAPIC-PCI IOAPIC @ 1.25V, PCI @1.5V
0
TYP MAX UNITS
500 ps
500 ps
2.1
4
ns
500 ps
12