ics8536ag-02 Integrated Device Technology, ics8536ag-02 Datasheet - Page 10

• Manufacturer Part Number: ics8536ag-02
• Description: Xtal, Xtal, Differential Input Lvpecl Output 1 6 266-mhz Buffer
• Manufacturer: Integrated Device Technology

8536AG-02
This section provides information on power dissipation and junction temperature for the ICS8536-02.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS8536-02 is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for V
NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad and directly affects the reliability of the
device. The maximum recommended junction temperature for HiPerClockS
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance
moderate air flow of 1 meter per second and a multi-layer board, the appropriate value is 65°C/W per Table 7 below.
Therefore, Tj for an ambient temperature of 70°C with all outputs switching is:
This calculation is only an example. Tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow,
and the type of board (single layer or multi-layer).
T
ABLE
7. T
Multi-Layer PCB, JEDEC Standard Test Boards
Power (core)
Power (outputs)
If all outputs are loaded, the total power is 6* 30mW = 180mW
Total Power
The equation for Tj is as follows: Tj =
Tj = Junction Temperature
Pd_total = Total Device Power Dissipation (example calculation is in section 1 above)
T
70°C + 0.423W * 65°C/W = 97.5°C. This is below the limit of 125°C.
JA
A
HERMAL
= Ambient Temperature
= Junction-to-Ambient Thermal Resistance
Integrated
Circuit
Systems, Inc.
R
ESISTANCE
MAX
_MAX
MAX
= V
(3.465V, with all outputs switching) = 242.55mW + 180mW = 422.6mW
= 30mW/Loaded Output pair
CC_MAX
JA
FOR
* I
EE_MAX
24-
PIN
JA
P
CC
www.icst.com/products/hiperclocks.html
= 3.465V * 70mA = 242.55mW
PRELIMINARY
= 3.3V + 5% = 3.465V, which gives worst case results.
by Velocity (Meters per Second)
OWER
TSSOP, F
JA
L
* Pd_total + T
OW
S
C
ORCED
KEW
ONSIDERATIONS
A
C
10
, 1-
ONVECTION
-
TO
70°C/W
TO
-3.3V, 2.5V LVPECL F
0
-6, D
TM
devices is 125°C.
UAL
C
65°C/W
RYSTAL OR
1
JA
must be used. Assuming a
ICS8536-02
LVCMOS I
62°C/W
ANOUT
2.5
REV. A AUGUST 24, 2005
B
UFFER
NPUT