13

ICS9250-28

Group Skews (CPU 133 MHz, SDRAM 133MHz)

TA = 0 - 70º 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 - 70º 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