ORT8850H AGERE [Agere Systems], ORT8850H Datasheet - Page 106

• Manufacturer Part Number: ORT8850H
• Description: Field-Programmable System Chip (FPSC) Eight-Channel x 850 Mbits/s Backplane Transceiver
• Manufacturer: AGERE [Agere Systems]

ORCA ORT8850 FPSC
Eight-Channel x 850 Mbits/s Backplane Transceiver
Package Thermal Characteristics
Table 35. ORCA ORT8850 Plastic Package Thermal
Guidelines
* The 680-Pin PBGAM package includes 2 oz copper plates.
Package Coplanarity
The coplanarity limits of the Agere packages are as fol-
lows:
Table 36. ORCA ORT8850 Package Parasitics
106
106
352-Pin
PBGA
680-Pin
PBGAM*
352-Pin PBGA
680-Pin PBGAM
Package
PBGAM: 8.0 mils
PBGA: 8.0 mils
Package Type
19.0
13.4
fpm
0
JA
16.0
fpm
11.5
200
(°C/W)
L
5.0
3.8
PAD N + 1
15.0
10.5
fpm
500
SW
PAD N
T
T = 70 °C Max,
J
L
= 125 °C Max,
2.0
1.3
0 fpm (W)
MW
Figure 25. Package Parasitics
2.90
4.10
L
L
L
MW
SW
SW
C
M
220
250
R
R
R
W
W
W
Package Parasitics
The electrical performance of an IC package, such as
signal quality and noise sensitivity, is directly affected
by the package parasitics. Table 36 lists eight parasit-
ics associated with the ORCA packages. These para-
sitics 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. Resistance values are in m
The parasitic values in Table 36 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
C
C
1.5
1.0
1
1
C
1
L
L
L
2
ML
SL
SL
, the total capacitance of the lead to all other
1.5
1.0
C
2
CIRCUIT
BOARD PAD
C
C
2
2
C
1.5
0.3
M
M
, the mutual capaci-
7.0—12.0 3.0—6.0
MW
1
2.8—5.0
and C
Agere Systems Inc.
SW
L
and L
SL
August 2001
and L
Data Sheet
2
ML
capacitors.
SL,
0.5—1.0
, the
L
5-3862(C)r2
the
ML
1