W255 Datasheet, PDF(5/10 Page) SpectraLinear Inc – 200 MHz 24-Output Buffer for 4 DDR or 3 SDRAM DIMMS

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W255 Datasheet, PDF (5/10 Pages) SpectraLinear Inc – 200 MHz 24-Output Buffer for 4 DDR or 3 SDRAM DIMMS

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Switching Characteristics (continued)[4]

Parameter

Name

Test Conditions

t4d

DDR Falling Edge Rate[3]

Measured between 20% to 80% of

output (refer to Figure 1)

Output to Output Skew for DDR[3] All outputs equally loaded

Output to Output Skew for

SDRAM[3]

All outputs equally loaded

SDRAM Buffer LH Prop. Delay[3] Input edge greater than 1 V/ns

SDRAM Buffer HL Prop. Delay[3] Input edge greater than 1 V/ns

Switching Waveforms

Duty Cycle Timing

W255

Min. Typ. Max. Unit

0.5

1.50 V/ns

100

150

All Outputs Rise/Fall Time

2.4V

OUTPUT 0.4V

2.4V

0.4V

3.3V

Output-Output Skew

OUTPUT

SDRAM Buffer HH and LL Propagation Delay

INPUT

1.5V

OUTPUT

1.5V

Document #: 38-07255 Rev. *D

Page 5 of 10

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