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| 型号： | ICS85352AYILFT |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟及定时 |
| 英文描述： | 85352 SERIES, LOW SKEW CLOCK DRIVER, 12 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP48 |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, MS-026ABC-HD, TQFP-48 |
| 文件页数： | 3/17页 |
| 文件大小： | 1073K |
| 代理商： | ICS85352AYILFT |
IDT / ICS 3.3V, 2.5V LVPECL CLOCK MULTIPLEXER
11
ICS85352AYI REV B SEPTEMBER 27, 2006
ICS85352I
12 BIT, 2-TO-1, 3.3V, 2.5V LVPECL CLOCK MULTIPLEXER
POWER CONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS85352I.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS85352I is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for V
CC
= 3.3V + 5% = 3.465V, which gives worst case results.
NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.
Power (core)
MAX
= V
CC_MAX
* I
EE_MAX
= 3.465V * 170mA = 589.1mW
Power (outputs)
MAX
= 30mW/Loaded Output pair
If all outputs are loaded, the total power is 12 * 30mW = 360mW
Total Power
_MAX
(3.465V, with all outputs switching) = 589.1mW + 360mW = 949.1mW
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
TM 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)
T
A = Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance
θ
JA must be used. Assuming a
moderate air flow of 200 linear feet per minute and a multi-layer board, the appropriate value is 22.6°C/W per Table 6 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.949W * 22.6°C/W = 106.4°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 (single layer or multi-layer).
θθθθθ
JA
by Velocity (Linear Feet per Minute)
0
200
500
Multi-Layer PCB, JEDEC Standard Test Boards
27.6°C/W
22.6°C/W
20.7°C/W
TABLE 6. THERMAL RESISTANCE
θθθθθ
JA
FOR
48-PIN TQFP, FORCED CONVECTION
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| ICS85354AK-01LF | 功能描述:IC CLOCK MUX 2:1/1:2 16-VFQFPN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟缓冲器，驱动器 系列:HiPerClockS™ 标准包装:74 系列:- 类型:扇出缓冲器（分配） 电路数:1 比率 - 输入:输出:1:10 差分 - 输入:输出:是/是 输入:HCSL, LVCMOS, LVDS, LVPECL, LVTTL 输出:HCSL，LVDS 频率 - 最大:400MHz 电源电压:3 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:32-VFQFN 裸露焊盘 供应商设备封装:32-QFN（5x5） 包装:管件 |
| ICS85354AK-01LFT | 功能描述:IC CLOCK MUX 2:1/1:2 16-VFQFPN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟缓冲器，驱动器 系列:HiPerClockS™ 标准包装:74 系列:- 类型:扇出缓冲器（分配） 电路数:1 比率 - 输入:输出:1:10 差分 - 输入:输出:是/是 输入:HCSL, LVCMOS, LVDS, LVPECL, LVTTL 输出:HCSL，LVDS 频率 - 最大:400MHz 电源电压:3 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:32-VFQFN 裸露焊盘 供应商设备封装:32-QFN（5x5） 包装:管件 |
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