ICS853S024 Datasheet, PDF (11/16 Pages) Integrated Device Technology – LOW SKEW, 1-TO-24 DIFFERENTIAL-TO-3.3V, 2.5V LVPECL FANOUT BUFFER

ICS853S024
LOW SKEW, 1-TO-24 DIFFERENTIAL-TO-3.3V, 2.5V LVPECL FANOUT BUFFER
PRELIMINARY
Power Considerations
This section provides information on power dissipation and junction temperature for the ICS853S024.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS853S024 is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for V_CC = 3.465V, which gives worst case results.
NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.
• Power (core)_MAX = V_{CC_MAX} * I_{EE_MAX} = 3.465V * 200mA = 693mW
• Power (outputs)_MAX = 30mW/Loaded Output pair
If all outputs are loaded, the total power is 24 * 30mW = 720mW
Total Power__MAX (3.465V, with all outputs switching) = 693W + 720mW = 1.413W
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 devices is 125°C.
The equation for Tj is as follows: Tj = θ_JA * Pd_total + T_A
Tj = Junction Temperature
θ_JA = Junction-to-Ambient Thermal Resistance
Pd_total = Total Device Power Dissipation (example calculation is in section 1 above)
T_A = Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance θ_JA must be used. Assuming 0 air flow
and a multi-layer board, the appropriate value is 32.5°C/W per Table 5 below.
Therefore, Tj for an ambient temperature of 70°C with all outputs switching is:
70°C + 1.413 W * 32.5°C/W = 115.9°C. This is below the limit of 125°C.
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).
Table 5. Thermal Resistance θ_JA for 64 Lead TQFP, EPad, Forced Convection
θ_JA by Velocity
Meters per Second
0
1
Multi-Layer PCB, JEDEC Standard Test Boards
32.5°C/W
26.6°C/W
2.5
25.1°C/W
LOW SKEW LVPECL FANOUT BUFFER
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ICS853S024AY REV. A APRIL 30, 2008