OR3T125-5BA352 AGERE [Agere Systems], OR3T125-5BA352 Datasheet - Page 196

• Manufacturer Part Number: OR3T125-5BA352
• Description: 3C and 3T Field-Programmable Gate Arrays
• Manufacturer: AGERE [Agere Systems]

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
Table 78. Package Parasitics
196
196
208-Pin SQFP
208-Pin SQFP2
240-Pin SQFP
240-Pin SQFP2
256-Pin PBGA
352-Pin PBGA
432-Pin EBGA
600-Pin EBGA
Package Type
Package Type
SQFP/SQFP2
EBGA
PBGA
L
SW
4
4
4
4
5
5
4
4
PAD N + 1
PAD N
Coplanarity Limit
L
1.5
1.5
MW
2
2
2
2
2
2
(mils)
3.15
8.0
8.0
4.0
Figure 104. Package Parasitics
L
L
L
MW
SW
SW
C
200
200
200
200
220
220
500
500
R
M
W
R
R
W
W
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: L
self-inductance of the lead; and L
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: C
tance of the lead to the nearest neighbor lead; and C
and C
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, R
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 C
1.5
C
C
C
1
1
1
1
1
1
1
1
1
1
L
L
L
2
ML
SL
SL
, the total capacitance of the lead to all other
1.5
C
1
1
1
1
1
1
1
2
BOARD PAD
C
C
2
2
C
1.5
0.3
0.4
1
1
1
1
1
M
Lucent Technologies Inc.
M
, the mutual capaci-
MW
1
W
3—5.5
7—10
8—12
7—11
7—12
and C
6—9
5—8
3—6
SW
, is in M
L
and L
SL
and L
Data Sheet
2
June 1999
ML
capacitors.
SL,
, the
0.5—1
0.5—1
4—6
4—6
5—8
4—7
2—4
3—6
L
the
5-3862(F).a
ML
1