OR3C80 datasheet(196/210 Pages) AGERE

196 / 210 page

196

Lucent Technologies Inc.

Data Sheet

June 1999

ORCA Series 3C and 3T FPGAs

Package Coplanarity

The coplanarity limits of the

ORCA Series 3 packages

are as follows.

Table 77. Package Coplanarity

Package Parasitics

The electrical performance of an IC package, such as

signal quality and noise sensitivity, is directly affected

by the package parasitics. Table 78 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 capaci-

tance of the lead to the nearest 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 capaci-

tive crosstalk and the capacitive loading effect of the

lead. The lead resistance value, RW, is in M

Ω.

The parasitic values in Table 78 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.

Package Type

Coplanarity Limit

(mils)

EBGA

8.0

PBGA

8.0

SQFP/SQFP2

4.0

3.15

Table 78. Package Parasitics

5-3862(F).a

Figure 104. Package Parasitics

Package Type

LSW

LMW

LSL

LML

208-Pin SQFP

200

7—10

4—6

208-Pin SQFP2

200

6—9

4—6

240-Pin SQFP

200

8—12

5—8

240-Pin SQFP2

200

7—11

4—7

256-Pin PBGA

220

5—8

2—4

352-Pin PBGA

220

1.5

7—12

3—6

432-Pin EBGA

1.5

500

0.3

3—5.5

0.5—1

600-Pin EBGA

1.5

500

0.4

3—6

0.5—1

PAD N

BOARD PAD

LSW

LSL

LMW

LML

PAD N + 1

LSW

LSL

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