參數(shù)資料
型號(hào)： ICS8422004AGIT
英文描述： FEMTOCLOCKS⑩ LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER
中文描述： FEMTOCLOCKS⑩的LVCMOS /水晶到LVHSTL頻率合成器
文件頁(yè)數(shù)： 9/13頁(yè)
文件大?。?/td> 190K
代理商： ICS8422004AGIT
8422004AGI
www.icst.com/products/hiperclocks.html
REV. B NOVEMBER 14, 2005
9
Integrated
Circuit
Systems, Inc.
ICS8422004I
F
EMTO
C
LOCKS
LVCMOS/C
RYSTAL
-
TO
-
LVHSTL F
REQUENCY
S
YNTHESIZER
PRELIMINARY
P
OWER
C
ONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS8422004I.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS8422004I 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
DD_MAX
* I
DD_MAX
= 3.465V * 100mA =
346.5mW
Power (outputs)
MAX
=
32.8mW/Loaded Output pair
If all outputs are loaded, the total power is 4 * 32.8mW =
131.2mW
Total Power
_MAX
(3.465V, with all outputs switching) =
346.5mW + 131.2mW =
477.7mW
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
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 + 0.478W * 65°C/W = 99.85°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).
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
相關(guān)PDF資料
PDF描述
ICS8422004I FEMTOCLOCKS⑩ LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER
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參數(shù)描述
ICS8422004I 制造商:ICS 制造商全稱(chēng):ICS 功能描述:FEMTOCLOCKS⑩ LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER
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ICS842256CK-24LFT 功能描述:IC FREQ SYNTHESIZER 32-VFQFPN RoHS:是 類(lèi)別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:HiPerClockS™, FemtoClock™ 標(biāo)準(zhǔn)包裝:27 系列:Precision Edge® 類(lèi)型:頻率合成器 PLL:是 輸入:PECL，晶體 輸出:PECL 電路數(shù):1 比率 - 輸入:輸出:1:1 差分 - 輸入:輸出:無(wú)/是 頻率 - 最大:800MHz 除法器/乘法器:是/無(wú) 電源電壓:3.135 V ~ 5.25 V 工作溫度:0°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC 包裝:管件
ICS8427-02 制造商:ICS 制造商全稱(chēng):ICS 功能描述:500MHZ, LOW JITTER LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER
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