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參數(shù)資料
| 型號： | ICS841664AGILFT |
| 廠商： | IDT, Integrated Device Technology Inc |
| 文件頁數(shù)： | 6/19頁 |
| 文件大小： | 0K |
| 描述： | IC CLOCK GENERATOR 28-TSSOP |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 系列： | HiPerClockS™, FemtoClock™ |
| 類型： | 時鐘發(fā)生器，扇出配送，多路復(fù)用器 |
| PLL： | 帶旁路 |
| 輸入： | LVCMOS，LVTTL，晶體 |
| 輸出： | HCSL，LVCMOS，LVTTL |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 2:5 |
| 差分 - 輸入:輸出： | 無/是 |
| 頻率 - 最大： | 156.25MHz |
| 除法器/乘法器： | 是/無 |
| 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： | 28-TSSOP（0.240"，6.10mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-TSSOP |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | 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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| ICS841664I | 制造商:IDT 制造商全稱: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 類別:集成電路 (IC) >> 時鐘/計(jì)時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:FemtoClock® NG 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/是 頻率 - 最大:800MHz 除法器/乘法器:是/無 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 |
| ICS841N254AKILFT | 制造商:Integrated Device Technology Inc 功能描述:IC CLK SYNTHESIZER 32VFQFN |
| ICS841N254I | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:FEMTOCLOCK? NG Crystal-to-LVDS/HCSL Clock Synthesizer |
| ICS841S01 | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:PCI EXPRESS⑩ CLOCK GENERATOR |
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