89TTM552BL Integrated Device Technology (Idt), 89TTM552BL Datasheet - Page 18
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89TTM552BL
Manufacturer Part Number
89TTM552BL
Description
ATM Traffic Management 10Gbps 1.8V 1192-Pin FCBGA
Manufacturer
Integrated Device Technology (Idt)
Datasheet
1.89TTM552BL.pdf
(37 pages)
Specifications of 89TTM552BL
Package
1192FCBGA
Traffic Class
VBR
Throughput
10000 Mbps
Typical Operating Supply Voltage
1.8 V
Minimum Operating Supply Voltage
1.71 V
Maximum Operating Supply Voltage
1.89 V
89TTM552 Thermal Considerations
89TTM552 Thermal Considerations
89TTM552 Thermal Considerations
89TTM552 Thermal Considerations
to air. The device specifications provide
sink (area, height, fin type, etc.) and the airflow across the heat sink. The device specifications also provide the maximum operating junction tempera-
ture (T
under any operating condition. One method of accomplishing this is to calculate the maximum ambient temperature (T
on the above device parameters. The formula is shown below.
IDT 89TTM552
This section describes the temperature and heat sink calculations for flip-chip BGA devices.
The thermal circuit is as shown below.
For flip-chip BGA devices, there are two paths for heat dissipation: one through the package balls to the board and other through the package case
J
T
) that will not degrade the device reliability. The system designer should ensure that the device maximum junction temperature is not exceeded
A
= T
Symbol
J
Ø
Ø
Ø
JC
JA
JB
- W x
Ø
Thermal resistance, junction to ambient (no heat sink)
Estimated thermal resistance, junction to board
Thermal resistance, junction to case
Ø
----------------------
JB
JB
x (
+
Ø
Ø
JC
JC
+
+
Ø
Ø
Ø
JB
CA
CA
Total Power
= W
and
)
Device
Ø
JC
Parameter
Table 25 89TTM552 Thermal Characteristics
numbers. The
T
Figure 4 89TTM552 Thermal Circuit
J
Ø
Ø
JC
JB
Ø
18 of 37
CA
W1
W2 (dissipated through board)
number comes from the heat sink manufacturer and depends on type of heat
Ø
CA
Value Units
T
T
A
A
0.19
9.0
5.5
4.5
2.2
°C / W
°C / W
°C / W
°C / W
°C / W
Conditions
A
200 FPM.
500 FPM
) that can be tolerated based
Still air.
April 7, 2005