ICS9250-16 Datasheet, PDF (14/17 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers for Celeron & PII/III™

ICS9250-16
Group Skews (CPU = 66 MHz)
T_A = 0 - 70º C; V_DD = 3.3 V +/-5%, V_DDL = 2.5 V +/-5%
CPU & IOAPIC load (lumped) = 20 pF; PCI, SDRAM, 3V66 load (lumped) = 30 pF
Refer to Group Offset Waveform diagram for definition of transition edges.
PARAMETER
SYMBOL
CONDITIONS
CPU to SDRAM
Skew¹
Skew Window¹
T_{sk1 CPU-SDRAM}
T_{w1 CPU-SDRAM}
CPU @ 1.25 V, SDRAM @ 1.5 V
CPU to 3V66
Skew¹
Skew Window¹
T_{sk1 CPU-3V66}
T_{w1 CPU-3V66}
CPU @ 1.25 V, 3V66 @ 1.5 V
SDRAM to 3V66
Skew^{1 T}sk1 SDRAM-3V66
Skew Window^{1 T}w1 SDRAM-3V66
SDRAM, 3V66 @ 1.5 V
3V66 to PCI
Skew¹
Skew Window¹
T_{sk1 3V66-PCI}
T_{w1 3V66-PCI}
3V66, PCI @ 1.5 V
IOAPIC to PCI
Skew¹
Skew Window¹
T_{sk1 IOAPIC-PCI}
T_{w1 IOAPIC-PCI}
IOAPIC @ 1.25 V, PCI @ 1.5 V
1_{Guaranteed by design, not 100% tested in production.}
MIN
-3
0
7
0
-500
0
1.5
0
-1
0
TYP MAX UNITS
-2.6
-2
ns
150 500 ps
7.2
8
ns
130 500 ps
100 500 ps
155 500 ps
2.4 3.5 ns
275 500 ps
-0.4
1
ns
0.25
1
ns
Group Skews (CPU = 100 MHz)
T_A = 0 - 70º C; V_DD = 3.3 V +/-5%, V_DDL = 2.5 V +/-5%
CPU & IOAPIC load (lumped) = 20 pF; PCI, SDRAM, 3V66 load (lumped) = 30 pF
Refer to Group Offset Waveform diagram for definition of transition edges.
PARAMETER
SYMBOL
CONDITIONS
CPU to SDRAM
Skew¹
Skew Window¹
T_{sk2 CPU-SDRAM}
T_{w2 CPU-SDRAM}
CPU @ 1.25 V, SDRAM @ 1.5 V
CPU to 3V66
Skew¹
Skew Window¹
T_{sk2 CPU-3V66}
T_{w2 CPU-3V66}
CPU @ 1.25 V, 3V66 @ 1.5 V
SDRAM to 3V66
Skew^{1 T}sk2 SDRAM-3V66
Skew Window^{1 T}w2 SDRAM-3V66
SDRAM, 3V66 @ 1.5 V
3V66 to PCI
Skew¹
Skew Window¹
T_{sk2 3V66-PCI}
T_{w2 3V66-PCI}
3V66, PCI @ 1.5 V
IOAPIC to PCI
Skew¹
Skew Window¹
T_{sk2 IOAPIC-PCI}
T_{w2 IOAPIC-PCI}
IOAPIC @ 1.25 V, PCI @ 1.5 V
1_{Guaranteed by design, not 100% tested in production.}
1_{Guaranteed by design, not 100% tested in production.}
MIN
4.5
0
4.5
0
-500
0
1.5
0
-1
0
TYP MAX UNITS
4.9 5.5 ns
140 500 ps
4.8 5.5 ns
150 500 ps
100 500 ps
155 500 ps
2.4 3.5 ns
275 500 ps
-0.4
1
ns
0.25
1
ns
14