參數(shù)資料
型號: ICS873995AYLFT
廠商: INTEGRATED DEVICE TECHNOLOGY INC
元件分類: 時鐘及定時
英文描述: 873995 SERIES, PLL BASED CLOCK DRIVER, 6 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP48
封裝: 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, MS-026, TQFP-48
文件頁數(shù): 5/18頁
文件大小: 738K
代理商: ICS873995AYLFT
IDT / ICS LVPECL ZERO DELAY/MULTIPLIER/DIVIDER
13
ICS873995AY REV. A JANUARY 8, 2007
ICS873995
DIFFERENTIAL-TO-3.3V LVPECL ZERO DELAY/MULTIPLIER/DIVIDER
θθθθθ
JA
by Velocity (Meters per Second)
01
2
Multi-Layer PCB, JEDEC Standard Test Boards
31.8°C/W
25.8°C/W
24.2°C/W
TABLE 6. THERMAL RESISTANCE
θθθθθ
JA
FOR
48-PIN TQFP, E-PAD FORCED CONVECTION
POWER CONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS873995.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS873995 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 * 300mA = 1039.5mW
Power (outputs)
MAX
= 30mW/Loaded Output pair
If all outputs are loaded, the total power is 6 * 30mW = 180mW
Total Power
_MAX
(3.465V, with all outputs switching) = 1039.5mW + 180mW = 1219.56mW
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
TM devices is 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)
T
A = Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance
θ
JA must be used. Assuming a
moderate air flow of 1 meter per second and a multi-layer board, the appropriate value is 25.8°C/W per Table 6 below.
Therefore, Tj for an ambient temperature of 70°C with all outputs switching is:
70°C + 1.220W * 25.8°C/W = 101.5°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).
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