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参数资料
| 型号： | ICS84327AM |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 625 MHz, OTHER CLOCK GENERATOR, PDSO24 |
| 封装： | 7.50 X 15.33 MM, 2.30 MM HEIGHT, MS-013, MO-119, SOIC-24 |
| 文件页数： | 3/16页 |
| 文件大小： | 436K |
| 代理商： | ICS84327AM |
84327AM
www.icst.com/products/hiperclocks.html
REV. A SEPTEMBER 18, 2003
11
Integrated
Circuit
Systems, Inc.
ICS84327
CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
PRELIMINARY
POWER CONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS84327.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS84327 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 * 140mA = 485mW
Power (outputs)
MAX = 30.2mW/Loaded Output pair
If all outputs are loaded, the total power is 6 * 30.2mW = 181mW
Total Power
_MAX (3.465V, with all outputs switching) = 485mW + 181mW = 666mW
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 HiPerClockSTM 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 43°C/W per Table 7 below.
Therefore, Tj for an ambient temperature of 70°C with all outputs switching is:
70°C + 0.666W * 43°C/W = 98.6°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)
TABLE 7. THERMAL RESISTANCE
θθθθθ
JA
FOR
24-PIN SOIC, FORCED CONVECTION
0
200
500
Multi-Layer PCB, JEDEC Standard Test Boards
50°C/W
43°C/W
38°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
ICS84327
CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
TSD
IDT / ICS CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
ICS84327
11
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| ICS84327AMLF | 功能描述:IC SYNTHESIZER LVPECL 24SOIC RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:HiPerClockS™ 标准包装:1,500 系列:- 类型:时钟缓冲器/驱动器 PLL:是 主要目的:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 电源电压:3.3V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:带卷 (TR) 其它名称:93786AFT |
| ICS84327AMLFT | 功能描述:IC SYNTHESIZER LVPECL 24SOIC RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:HiPerClockS™ 标准包装:1,500 系列:- 类型:时钟缓冲器/驱动器 PLL:是 主要目的:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 电源电压:3.3V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:带卷 (TR) 其它名称:93786AFT |
| ICS84327AMT | 制造商:ICS 制造商全称:ICS 功能描述:CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER |
| ICS84329 | 制造商:ICS 制造商全称:ICS 功能描述:700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
| ICS84329-01 | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
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