參數(shù)資料
型號(hào): ICS854104AGILFT
廠商: IDT, Integrated Device Technology Inc
文件頁(yè)數(shù): 3/15頁(yè)
文件大?。?/td> 0K
描述: IC CLK BUFFER 1:4 700MHZ 16TSSOP
標(biāo)準(zhǔn)包裝: 2,500
系列: HiPerClockS™
類(lèi)型: 扇出緩沖器(分配)
電路數(shù): 1
比率 - 輸入:輸出: 1:4
差分 - 輸入:輸出: 是/是
輸入: HCSL,LVDS,LVHSTL,LVPECL,SSTL
輸出: LVDS
頻率 - 最大: 700MHz
電源電壓: 3.135 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 16-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 16-TSSOP
包裝: 帶卷 (TR)
ICS854104AGI REVISION B JANUARY 30, 2014
11
2014 Integrated Device Technology, Inc.
ICS854104I DATA SHEET
LOW SKEW, 1-TO-4, DIFFERENTIAL-TO-LVDS FANOUT BUFFER
Power Considerations
This section provides information on power dissipation and junction temperature for the ICS854104I.
Equations and example calculations are also provided.
1.
Power Dissipation.
The total power dissipation for the ICS854104I is the sum of the core power plus the analog power plus the power dissipated in the load(s).
The following is the power dissipation for VDD = 3.3V + 5% = 3.465V, which gives worst case results.
Power (core)MAX =VDD_MAX *IDD_MAX = 3.465V * 75mA = 259.875mW
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 100.3°C/W per Table 6 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.260W * 100.3°C/W = 111.1°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 (multi-layer).
Table 6. Thermal Resistance
JA for 16-Lead TSSOP, Forced Convection
JA by Velocity
Meters per Second
0
1
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
100.3°C/W
96.0°C/W
93.9°C/W
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