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參數(shù)資料
| 型號(hào)： | ICS853014BGT |
| 英文描述： | Hex inverter buffers / drivers with high-voltage outputs 14-SOIC 0 to 70 |
| 中文描述： | 低偏移，1至5 2.5V/3.3V的DIFFERENTIAL-TO-LVPECL/ECL扇出緩沖器 |
| 文件頁(yè)數(shù)： | 12/17頁(yè) |
| 文件大小： | 470K |
| 代理商： | ICS853014BGT |
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853014BG
www.icst.com/products/hiperclocks.html
REV. C MAY 13, 2005
12
Integrated
Circuit
Systems, Inc.
ICS853014
L
OW
S
KEW
, 1-
TO
-5
2.5V/3.3V D
IFFERENTIAL
-
TO
-LVPECL/ECL F
ANOUT
B
UFFER
P
OWER
C
ONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS853014.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS853014 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
= V
CC_MAX
* I
EE_MAX
= 3.8V * 75mA =
285mW
Power (outputs)
MAX
=
30.94mW/Loaded Output pair
If all outputs are loaded, the total power is 5 * 30.94mW =
154.7mW
Total Power
_MAX
(3.8V, with all outputs switching) =
285mW + 154.7mW =
439.7mW
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 + T
A
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
must be used
moderate air flow of 200 linear feet per minute and a multi-layer board, the appropriate value is 66.6°C/W per Table 6 below.
. Assuming a
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.440W * 66.6°C/W = 114.3°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).
θ
JA
by Velocity (Linear Feet per Minute)
0
200
500
Single-Layer PCB, JEDEC Standard Test Boards
Multi-Layer PCB, JEDEC Standard Test Boards
114.5°C/W
73.2°C/W
98.0°C/W
66.6°C/W
88.0°C/W
63.5°C/W
NOTE:
Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
T
ABLE
6. T
HERMAL
R
ESISTANCE
θ
JA
FOR
20-
PIN
TSSOP, F
ORCED
C
ONVECTION
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