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| 型號： | 211AI01L |
| 英文描述： | LOW SKEW, 1-TO-2 DIFFERENTIAL-TO-HSTL FANOUT BUFFER |
| 中文描述： | 低偏移，1至2差分至HSTL扇出緩沖器 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大小： | 166K |
| 代理商： | 211AI01L |
85211AMI-01
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 1, 2005
9
Integrated
Circuit
Systems, Inc.
ICS85211I-01
L
OW
S
KEW
, 1-
TO
-2
D
IFFERENTIAL
-
TO
-HSTL F
ANOUT
B
UFFER
3. Calculations and Equations.
The purpose of this section is to derive the power dissipated into the load.
HSTL output driver circuit and termination are shown in
Figure 4.
T
o calculate worst case power dissipation into the load, use the following equations which assume a 50
Ω
load.
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = (V
OH_MAX
/R
L
) * (V
DD_MAX
- V
OH_MAX
)
Pd_L = (V
OL_MAX
/R
L
) * (V
DD_MAX
- V
OL_MAX
)
Pd_H = (1.4V/50
Ω
) * (3.465V - 1.4V) = 57.82mW
Pd_L = (0.4V/50
Ω
) * (3.465V - 0.4V) = 24.52mW
Total Power Dissipation per output pair = Pd_H + Pd_L =
82.34mW
F
IGURE
4. HSTL D
RIVER
C
IRCUIT
AND
T
ERMINATION
V
DD
V
OUT
RL
50
Ω
Q1
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