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ICS8S89832I Datasheet(PDF) 11 Page - Integrated Device Technology |
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ICS8S89832I Datasheet(HTML) 11 Page - Integrated Device Technology |
11 / 16 page ICS8S89832I Data Sheet LOW SKEW, 1-TO-4 DIFFERENTIAL-TO-LVDS FANOUT BUFFER ICS8S89832AKI REVISION A JANUARY 11, 2010 11 ©2010 Integrated Device Technology, Inc. Power Considerations This section provides information on power dissipation and junction temperature for the ICS8S89832I. Equations and example calculations are also provided. 1. Power Dissipation. The total power dissipation for the ICS8S89832I is the sum of the core power plus the analog power plus the power dissipated in the load(s). The following is the power dissipation for VDD = 2.5V + 5% = 2.625V, which gives worst case results. NOTE: Please refer to Section 3 for details on calculating power dissipated in the load. • Power (core) MAX = V DD_MAX * IDD_MAX = 2.625V * 95mA = 249.375mW 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 + TA Tj = Junction Temperature θ JA = Junction-to-Ambient Thermal Resistance Pd_total = Total Device Power Dissipation (example calculation is in section 1 above) TA = 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 74.7°C/W per Table 6 below. Therefore, Tj for an ambient temperature of 85°C with all outputs switching is: 85°C + 0.249W * 74.7°C/W = 103.6°C. This is well 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 6. Thermal Resistance θJA for 16 Lead VFQFN Forced Convection θ JA by Velocity Meters per Second 01 2.5 Multi-Layer PCB, JEDEC Standard Test Boards 74.7°C/W 65.3°C/W 58.5°C/W |
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