ICS874S02I

1:1 DIFFERENTIAL-TO-LVDS ZERO DELAY CLOCK GENERATOR

IDT™ / ICS™ LVDS CLOCK GENERATOR

13

ICS874S02BMI REV. AOCTOBER 16, 2008

Power Considerations

This section provides information on power dissipation and junction temperature for the ICS874S02I.

Equations and example calculations are also provided.

1.

Power Dissipation.

The total power dissipation for the ICS874S02I is the sum of the core power plus the analog power plus the power dissipated in the load(s).

•

The maximum current at 85°C is as follows:

•

•

•

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

Tj = Junction Temperature

θ

Pd_total = Total Device Power Dissipation (example calculation is in section 1 above)

In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance

θ

and a multi-layer board, the appropriate value is 64.7°C/W per Table 7 below.

Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:

85°C + 0.513W * 64.7°C/W = 118.2°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 (single layer or multi-layer).

θ

Linear Feet per Minute

0200

500

Multi-Layer PCB, JEDEC Standard Test Boards

64.7°C/W

56.7°C/W

53.5°C/W