參數(shù)資料
型號(hào): ICS853111YLF
元件分類: 時(shí)鐘及定時(shí)
英文描述: LOW SKEW CLOCK DRIVER, 10 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32
封裝: 7 X 7 MM, 1.40 MM HEIGHT, LQFP-32
文件頁(yè)數(shù): 12/12頁(yè)
文件大?。?/td> 161K
代理商: ICS853111YLF
853111AY
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 14, 2002
9
Integrated
Circuit
Systems, Inc.
ICS853111
LOW SKEW, 1-TO-10
DIFFERENTIAL-TO-2.5V/3.3V LVPECL/ECL FANOUT BUFFER
PRELIMINARY
3. Calculations and Equations.
LVPECL output driver circuit and termination are shown in Figure 4.
To calculate worst case power dissipation into the load, use the following equations which assume a 50
load, and a termination
voltage of V
CCO
- 2V.
For logic high, V
OUT
= V
OH_MAX
= V
CCO_MAX
– 1.0V
(V
CC_MAX
- V
OH_MAX
) = 1.0V
For logic low, V
OUT
= V
OL_MAX
= V
CCO_MAX
– 1.7V
(V
CCO_MAX
- V
OL_MAX
) = 1.7V
Pd_H = [(V
OH_MAX
– (V
CCO_MAX
- 2V))/R
L
] * (V
CCO_MAX
- V
OH_MAX
) = [(2V - (V
CCO_MAX
- V
OH_MAX
))/R
L
] * (V
CCO _MAX
- V
OH_MAX
) =
[(2V - 1V)/50
] * 1V = 20.0mW
Pd_L = [(V
OL_MAX
– (V
CCO_MAX
- 2V))/R
L
] * (V
CCO_MAX
- V
OL_MAX
) = [(2V - (V
CCO_MAX
- V
OL_MAX
))/R
L
] * (V
CCO_MAX
- V
OL_MAX
) =
[(2V - 1.7V)/50
] * 1.7V = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30.2mW
Figure 4. LVPECL Driver Circuit and Termination
VCCO - 2V
Q1
VOUT
RL
50
VCCO
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