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參數(shù)資料
| 型號： | ICS843004I |
| 英文描述： | FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER |
| 中文描述： | FEMTOCLOCKS -商標晶體到3.3伏，2.5伏的LVPECL頻率合成器 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 253K |
| 代理商： | ICS843004I |
843004AGI
www.icst.com/products/hiperclocks.html
REV. A FEBRUARY 11, 2005
11
Integrated
Circuit
Systems, Inc.
ICS843004I
F
EMTO
C
LOCKS
C
RYSTAL
-
TO
-
3.3V, 2.5V LVPECL F
REQUENCY
S
YNTHESIZER
P
OWER
C
ONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS843004I.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS843004I 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 * 130mA =
450.45mW
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) =
450.45mW + 120mW =
570.45mW
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
must be used. Assuming a
moderate air flow of 1 meter per second and a multi-layer board, the appropriate value is 65°C/W per Table 6 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.571W * 65°C/W = 122.1°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
6. T
HERMAL
R
ESISTANCE
θ
JA
FOR
24-
PIN
TSSOP, F
ORCED
C
ONVECTION
θ
JA
by Velocity (Meters per Second)
0
1
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
70°C/W
65°C/W
62°C/W
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| ICS843004 | FEMTOCLOCKS⑩ LVCMOS/CRYSTAL-TO- 3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS843004AG | FEMTOCLOCKS⑩ LVCMOS/CRYSTAL-TO- 3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS843004AGT | FEMTOCLOCKS⑩ LVCMOS/CRYSTAL-TO- 3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS843011C | FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ICS843004I-01 | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER |
| ICS843004I-04 | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL/LVCMOS-TO- 3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS843011 | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR |
| ICS8430-111 | 制造商:ICS 制造商全稱:ICS 功能描述:700MHZ, LOW JITTER DIFFERENTIAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS843011AG | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR |
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