参数资料
型号: ICS85408BGILF
厂商: IDT, Integrated Device Technology Inc
文件页数: 4/16页
文件大小: 0K
描述: IC CLK BUFFER 1:8 700MHZ 24TSSOP
标准包装: 62
系列: HiPerClockS™
类型: 扇出缓冲器(分配)
电路数: 1
比率 - 输入:输出: 1:8
差分 - 输入:输出: 是/是
输入: HCSL,LVDS,LVHSTL,LVPECL,SSTL
输出: LVDS
频率 - 最大: 700MHz
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: 24-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 24-TSSOP
包装: 管件
其它名称: 85408BGILF
ICS85408BGILF-ND
ICS85408I Datasheet
LOW SKEW, 1-TO-8, DIFFERENTIAL-TO-LVDS CLOCK DISTRIBUTION CHIP
ICS85408BGI REVISION B JULY 2, 2009
12
2009 Integrated Device Technology, Inc.
Power Considerations
This section provides information on power dissipation and junction temperature for the ICS85408I.
Equations and example calculations are also provided.
1.
Power Dissipation.
The total power dissipation for the ICS85408I 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 * 90mA = 311.85mW
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 HiPerClockS 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)
TA = Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance
θ
JA must be used. Assuming no air flow and
a multi-layer board, the appropriate value is 70°C/W per Table 6 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.312W * 70°C/W = 106.8°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 θJA for 24 Lead TSSOP, Forced Convection
θ
JA by Velocity
Meters per Second
01
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
70°C/W
65.0°C/W
62°C/W
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