ICS859S0424I Datasheet, PDF (19/24 Pages) Integrated Device Technology – Four programmable differential LVPECL or LVDS output pairs

ICS859S0424I Data Sheet
4:4 DIFFERENTIAL-TO-LVPECL/LVDS CLOCK MULTIPLEXER
Power Considerations (3.3V LVPECL Outputs)
This section provides information on power dissipation and junction temperature for the ICS859S0424I.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS859S0424I is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for V_CC = 3.3V + 5% = 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 * 72mA = 249.5mW
• Power (outputs)_MAX = 30mW/Loaded Output pair
If all outputs are loaded, the total power is 4 * 30mW = 120mW
Total Power__MAX (3.465V, with all outputs switching) = 249.5mW + 120mW = 369.5mW
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad directly affects the reliability of the device. The
maximum recommended junction temperature is 125°C. Limiting the internal transistor junction temperature, Tj, to 125°C ensures that the bond
wire and bond pad temperature remains below 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 no air flow and
a multi-layer board, the appropriate value is 82.8°C/W per Table 7A below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.370W * 82.8°C/W = 115.6°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 (multi-layer).
Table 7A. Thermal Resistance θ_JA for 24 Lead TSSOP, Forced Convection
θ_JA vs. Air Flow
Meters per Second
0
1
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
82.8°C/W
78.5
76.3
ICS859S0424BGI REVISION A OCTOBER 12, 2011
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©2011 Integrated Device Technology, Inc.