780MHZ, C
參數(shù)資料
型號(hào)： ICS84320AYI-01LF
廠商： IDT, Integrated Device Technology Inc
文件頁(yè)數(shù)： 6/20頁(yè)
文件大?。?/td> 0K
描述： IC FREQ SYNTHESIZER 32TQFP
標(biāo)準(zhǔn)包裝： 250
系列： HiPerClockS™
類型： 頻率合成器
PLL： 帶旁路
輸入： 晶體
輸出： LVPECL
電路數(shù)： 1
比率 - 輸入:輸出： 1:2
差分 - 輸入:輸出： 無(wú)/是
頻率 - 最大： 780MHz
除法器/乘法器： 是/無(wú)
電源電壓： 3.135 V ~ 3.465 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 32-LQFP
供應(yīng)商設(shè)備封裝： 32-TQFP（7x7）
包裝： 托盤(pán)
84320AYI-01
www.idt.com
REV. B AUGUST 4, 2010
14
ICS84320I-01
780MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER
POWER CONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS84320I-01.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS84320I-01 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 = VCC_MAX * IEE_MAX = 3.465V * 155mA = 537.08mW
Power (outputs)
MAX = 30mW/Loaded Output pair
If all outputs are loaded, the total power is 2 * 30mW = 60mW
Total Power
_MAX (3.465V, with all outputs switching) = 537.08mW + 60mW = 597.08mW
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 the 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 200 linear feet per minute and a multi-layer board, the appropriate value is 42.1°C/W per Table 8 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.597W * 42.1°C/W = 110.1°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).
θθθθθ
JA by Velocity (Linear Feet per Minute)
0
200
500
Single-Layer PCB, JEDEC Standard Test Boards
67.8°C/W
55.9°C/W
50.1°C/W
Multi-Layer PCB, JEDEC Standard Test Boards
47.9°C/W
42.1°C/W
39.4°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
TABLE 8. THERMAL RESISTANCE
θθθθθ
JA
FOR
32-PIN LQFP, FORCED CONVECTION
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ICS84320AYI-01LFT 功能描述:IC FREQ SYNTHESIZER 32TQFP RoHS:是 類別: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™ 標(biāo)準(zhǔn)包裝:27 系列:Precision Edge® 類型: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
ICS84320AYI-01T 制造商:ICS 制造商全稱:ICS 功能描述:780MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL
ICS84320I-01 制造商:ICS 制造商全稱:ICS 功能描述:780MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL
ICS84321 制造商:ICS 制造商全稱:ICS 功能描述:260MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
ICS8432-101 制造商:ICS 制造商全稱:ICS 功能描述:700MHZ, DIFFERENTIAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
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