
13
ICS9250-28
Group Skews (CPU 133 MHz, SDRAM 133MHz)
TA = 0 - 70 C; VDD = 3.3 V +/-5%, VDDL = 2.5 V +/-5%
CPU & IOAPIC load (lumped) = 20 pF; PCI, SDRAM, 3V66 load (lumped) = 30 pF
Refer to Group Offset Waveforms diagram for definition of transition edges.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CPU to SDRAM
Skew
1
Tsk3 CPU-SDRAM
3.25
3.45
4.25
ns
Skew Window
1
Tw3 CPU-SDRAM
0
155
500
ps
CPU to 3V66
Skew
1
Tsk3 CPU-3V66
-500
120
500
ps
Skew Window
1
Tw3 CPU-3V66
0
120
500
ps
SDRAM to 3V66
Skew
1
Tsk3 SDRAM-3V66
-3.25
-3.08
-4.25
ps
Skew Window
1
Tw3 SDRAM-3V66
0
175
500
ps
3V66 to PCI
Skew
1
Tsk3 3V66-PCI
1.5
2.2
3.5
ns
Skew Window
1
Tw3 3V66-PCI
0
80
500
ps
IOAPIC to PCI
Skew
1
Tsk3 IOAPIC-PCI
-1
-0.1
1
ns
Skew Window
1
Tw3 IOAPIC-PCI
001
ns
1Guaranteed by design, not 100% tested in production.
Group Skews (CPU133 MHz, SDRAM 100MHz)
TA = 0 - 70 C; VDD = 3.3 V +/-5%, VDDL = 2.5 V +/-5%
CPU & IOAPIC load (lumped) = 20 pF; PCI, SDRAM, 3V66 load (lumped) = 30 pF
Refer to Group Offset Waveforms diagram for definition of transition edges.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CPU to SDRAM
Skew
1
Tsk3 CPU-SDRAM CPU @ 1.25 V, SDRAM @ 1.5 V
-500
-15
500
ps
Skew Window
1
Tw3 CPU-SDRAM
0
165
500
ps
CPU to 3V66
Skew
1
Tsk3 CPU-3V66
CPU @ 1.25 V, 3V66 @ 1.5 V
-500
165
500
ps
Skew Window
1
Tw3 CPU-3V66
0
105
500
ps
SDRAM to 3V66
Skew
1
Tsk3 SDRAM-3V66
SDRAM, 3V66 @ 1.5 V
-500
185
500
ps
Skew Window
1
Tw3 SDRAM-3V66
0
185
500
ps
3V66 to PCI
Skew
1
Tsk3 3V66-PCI
3V66, PCI @ 1.5 V
1.5
2.2
3.5
ns
Skew Window
1
Tw3 3V66-PCI
0
60
500
ps
IOAPIC to PCI
Skew
1
Tsk3 IOAPIC-PCI
IOAPIC @ 1.25 V, PCI @ 1.5 V
-1
-0.1
1
ns
Skew Window
1
Tw3 IOAPIC-PCI
001
ns
1Guaranteed by design, not 100% tested in production.
CPU @ 1.25 V, 3V66 @ 1.5 V
SDRAM, 3V66 @ 1.5 V
3V66, PCI @ 1.5 V
IOAPIC @ 1.25 V, PCI @ 1.5 V
CPU @ 1.25 V, SDRAM @ 1.5 V