参数资料
型号: ICS853111AV-01
元件分类: 时钟及定时
英文描述: 853111 SERIES, LOW SKEW CLOCK DRIVER, 9 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQCC28
封装: 11.60 X 11.40 MM, 4.10 MM HEIGHT, PLASTIC, MS-018, LCC-28
文件页数: 2/15页
文件大小: 292K
代理商: ICS853111AV-01
853111AV-01
www.icst.com/products/hiperclocks.html
REV. A APRIL 25, 2005
10
Integrated
Circuit
Systems, Inc.
ICS853111-01
LOW SKEW, 1-TO-9
DIFFERENTIAL-TO-3.3V LVPECL/ECL FANOUT BUFFER
θθθθθ
JA
by Velocity (Linear Feet per Minute)
0
200
500
Multi-Layer PCB, JEDEC Standard Test Boards
37.8°C/W
31.1°C/W
28.3°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
POWER CONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS853111-01.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS853111-01 is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for V
CC = 3.8V, which gives worst case results.
NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.
Power (core)
MAX = VCC_MAX * IEE_MAX = 3.8V * 75mA = 285mW
Power (outputs)
MAX = 30.94mW/Loaded Output pair
If all outputs are loaded, the total power is 9 * 30.94mW = 278.5mW
Total Power
_MAX (3.8V, with all outputs switching) = 285mW + 278.5mW = 563.5mW
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 HiPerClockSTM 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 31.1°C/W per Table 5 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.564W * 31.1°C/W = 102°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).
TABLE 5. THERMAL RESISTANCE
θθθθθ
JA
FOR
28-PIN PLCC, FORCED CONVECTION
相关PDF资料
PDF描述
ICS853111AV-01 853111 SERIES, LOW SKEW CLOCK DRIVER, 9 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQCC28
ICS853111AYT LOW SKEW CLOCK DRIVER, 10 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32
ICS853111AY LOW SKEW CLOCK DRIVER, 10 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32
ICS853111AYLFT LOW SKEW CLOCK DRIVER, 10 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32
ICS853111BYLF LOW SKEW CLOCK DRIVER, 10 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32
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