OR3LP26B datasheet(180/184 Pages) AGERE

180 / 184 page

ORCA OR3LP26B FPSC

Data Sheet

Embedded Master/Target PCI Interface

March 2000

180

Lucent Technologies Inc.

Package Parasitics

The electrical performance of an IC package, such as signal quality and noise sensitivity, is directly affected by the

package parasitics. Table 73 lists eight parasitics associated with the

ORCA packages. These parasitics represent

the contributions of all components of a package, which include the bond wires, all internal package routing, and

the external leads.

Four inductances in nH are listed: LSW and LSL, the self-inductance of the lead; and LMW and LML, the mutual

inductance to the nearest neighbor lead. These parameters are important in determining ground bounce noise and

inductive crosstalk noise. Three capacitances in pF are listed: CM, the mutual capacitance of the lead to the near-

est neighbor lead; and C1 and C2, the total capacitance of the lead to all other leads (all other leads are assumed to

be grounded). These parameters are important in determining capacitive crosstalk and the capacitive loading effect

of the lead. The lead resistance value, RW, is in m

Ω.

The parasitic values in Table 73 are for the circuit model of bond wire and package lead parasitics. If the mutual

capacitance value is not used in the designer’s model, then the value listed as mutual capacitance should be added

to each of the C1 and C2 capacitors.

Table 73. Package Parasitics

5-3862(F).a

Figure 66. Package Parasitics

Package Type

LSW

(nH)

LMW

(nH)

Ω)

(pF)

LSL

(nH)

LML

(nH)

352-Pin PBGA

220

1.5

7—12

3—6

680-Pin EBGA

3.8

1.3

250

1.0

0.3

2.8—5.0

0.5—1.0

PAD N

BOARD PAD

LSW

LSL

LMW

LML

PAD N + 1

LSW

LSL

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