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參數(shù)資料
| 型號： | ICS843246I |
| 廠商： | Integrated Device Technology, Inc. |
| 英文描述： | FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER |
| 中文描述： | FEMTOCLOCKS⑩晶體至3.3的LVPECL頻率合成瓦/扇出緩沖器集成 |
| 文件頁數(shù)： | 12/17頁 |
| 文件大小： | 345K |
| 代理商： | ICS843246I |
IDT
/ ICS
3.3V LVPECL FREQUENCY SYNTHESIZER
12
ICS843246BGI REV. A AUGUST 2, 2007
ICS843246I
FEMTOCLOCKS CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/FANOUT BUFFER
P
OWER
C
ONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS843246I.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS843246I is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for V
= 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 * 180mA =
623.7mW
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) =
623.7
mW + 180mW =
803.7mW
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 + 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 37°C/W per Table 7 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.804W * 37°C/W = 114.7°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).
T
ABLE
7. T
HERMAL
R
ESISTANCE
θ
JA
FOR
24-P
IN
TSSOP, E-P
AD
F
ORCED
C
ONVECTION
θ
JA
by Velocity (Meters per Second)
0
1
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
37°C/W
31°C/W
30°C/W
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|---|---|
| ICS84324EM | 制造商:ICS 制造商全稱:ICS 功能描述:CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER WITH FANOUT BUFFER |
| ICS84324EMT | 制造商:ICS 制造商全稱:ICS 功能描述:CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER WITH FANOUT BUFFER |
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| ICS8432-51 | 制造商:ICS 制造商全稱:ICS 功能描述:700MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
| ICS843251-04 | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR |
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