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参数资料
| 型号： | ICS841664AGILFT |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 6/19页 |
| 文件大小： | 0K |
| 描述： | IC CLOCK GENERATOR 28-TSSOP |
| 标准包装： | 1,000 |
| 系列： | HiPerClockS™, FemtoClock™ |
| 类型： | 时钟发生器，扇出配送，多路复用器 |
| PLL： | 带旁路 |
| 输入： | LVCMOS，LVTTL，晶体 |
| 输出： | HCSL，LVCMOS，LVTTL |
| 电路数： | 1 |
| 比率 - 输入:输出： | 2:5 |
| 差分 - 输入:输出： | 无/是 |
| 频率 - 最大： | 156.25MHz |
| 除法器/乘法器： | 是/无 |
| 电源电压： | 3.135 V ~ 3.465 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-TSSOP（0.240"，6.10mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 带卷 (TR) |
| 其它名称： | 841664AGILFT |
ICS841664AGI REVISION A JULY 15, 2013
14
2013 Integrated Device Technology, Inc.
ICS841664I Data Sheet
FEMTOCLOCK CRYSTAL-TO-HCSL CLOCK GENERATOR
Power Considerations
This section provides information on power dissipation and junction temperature for the ICS841664I.
Equations and example calculations are also provided.
1.
Power Dissipation.
The total power dissipation for the ICS841664I is the total power minus the analog power plus the power dissipated into the load. The following
is the power dissipation for VDD = 3.3V + 5% = 3.465V, which gives worst case results.
Core and HCSL Output Power Dissipation
Power (core)MAX = VDD_MAX * (IDD_MAX + IDDA_MAX) = 3.465V * (80mA + 20mA) = 346.5mW
Power (outputs)MAX = 44.5mW/Loaded Output pair
If all outputs are loaded, the total power is 4 * 44.5mW = 178mW
LVCMOS Driver Power Dissipation
Dynamic Power Dissipation at 25MHz
Power (25MHz) = CPD * Frequency * (VDD)
2 = 4pF * 25MHz * (3.465V)2 = 1.20mW per output
Total Power Dissipation
Total Power
= Power (core) + Power (Outputs) + Total Power (25MHz)
= 346.5mW + 178mW + 1.2mW
= 525.7mW
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad directly affects the reliability of the device. The
maximum recommended junction temperature is 125°C. Limiting the internal transistor junction temperature, Tj, to 125°C ensures that the bond
wire and bond pad temperature remains below 125°C.
The equation for Tj is as follows: Tj =
JA * Pd_total + TA
Tj = Junction Temperature
JA = Junction-to-Ambient Thermal Resistance
Pd_total = Total Device Power Dissipation (example calculation is in section 1 above)
TA = Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance
JA must be used. Assuming no air flow and
a multi-layer board, the appropriate value is 64.5°C/W per Table 7 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.526W * 64.3°C/W = 118.9°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 (multi-layer).
Table 7. Thermal Resistance JA for 28 Lead TSSOP, Forced Convection
JA by Velocity
Meters per Second
01
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
64.5°C/W
60.4°C/W
58.5°C/W
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相关代理商/技术参数 |
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|---|---|
| ICS841664I | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:FEMTOCLOCK? CRYSTAL-TO-HCSL CLOCK GENERATOR |
| ICS841N254AKILF | 功能描述:IC CLK SYNTH PLL 250MHZ 32VFQFN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:FemtoClock® NG 标准包装:27 系列:Precision Edge® 类型:频率合成器 PLL:是 输入:PECL，晶体 输出:PECL 电路数:1 比率 - 输入:输出:1:1 差分 - 输入:输出:无/是 频率 - 最大:800MHz 除法器/乘法器:是/无 电源电压:3.135 V ~ 5.25 V 工作温度:0°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| ICS841N254AKILFT | 制造商:Integrated Device Technology Inc 功能描述:IC CLK SYNTHESIZER 32VFQFN |
| ICS841N254I | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:FEMTOCLOCK? NG Crystal-to-LVDS/HCSL Clock Synthesizer |
| ICS841S01 | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:PCI EXPRESS⑩ CLOCK GENERATOR |
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