參數資料
型號: ICS841S012DKILFT
廠商: IDT, Integrated Device Technology Inc
文件頁數: 8/23頁
文件大?。?/td> 0K
描述: IC FREQ SYNTHESIZER 56VFQFN
標準包裝: 1,000
系列: HiPerClockS™, PCI Express® (PCIe)
類型: 時鐘/頻率合成器,多路復用器
PLL:
主要目的: PCI Express(PCIe)
輸入: LVCMOS,LVTTL,晶體
輸出: HCSL,LVCMOS,LVTTL
電路數: 1
比率 - 輸入:輸出: 2:12
差分 - 輸入:輸出: 是/無
頻率 - 最大: 250MHz
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: 56-VFQFN 裸露焊盤
供應商設備封裝: 56-VFQFP-EP(8x8)
包裝: 帶卷 (TR)
ICS841S012BKI REVISION A NOVEMBER 10, 2009
16
2009 Integrated Device Technology, Inc.
ICS841S012I Data Sheet
CRYSTAL-TO-0.7V DIFFERENTIAL HCSL/LVCMOS FREQUENCY SYNTHESIZER
POWER CONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS841S012I.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS841S012I is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for V
DD = 3.3V + 5% = 3.465V, which gives worst case results.
Core and HCSL Output Power Dissipation
The maximum I
DD current at 85° is 300mA. The HCSL output current (17mA per output pair) is included in this value. For power
considerations, this output current is treated separately from the core current, so for power calculations,
I
DD
= 300mA - 2 * 17mA = 266mA.
Power (core) = V
DD_MAX * (IDD + IDDA ) = 3.465V * (266mA + 20mA) = 991.0mW
Power (HCSL) = 44.5mW/Load Output Pair
If all outputs are loaded, the total power is 2 * 44.5mW = 89mW
LVCMOS Output Power Dissipation
Dynamic Power Dissipation at 200MHz (QB, QC)
Power (200MHz) = C
PD * Frequency * (VDDO)
2
= 4pF * 200MHz * (3.465V)2 = 9.6mW per output
Total Power (200MHz) = 9.6mW * 8 = 76.7mW
Dynamic Power Dissipation at 25MHz (REF_OUT)
Power (25MHz) = C
PD * Frequency * (VDDO)
2
= 4pF * 25MHz * (3.465V)2 = 1.2mW per output
Total Power (25MHz) = 1.2mW * 2 = 2.4mW
Total Power Dissipation
Total Power
= Power (core) + Power (HCSL) + Total Power (200MHz) + Total Power (25MHz)
= 991.0mW + 89mW + 76.7mW + 2.4mW
= 1159mW
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