参数资料
型号: ICS85304AG-01T
厂商: INTEGRATED DEVICE TECHNOLOGY INC
元件分类: 时钟及定时
英文描述: 85304 SERIES, LOW SKEW CLOCK DRIVER, 5 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO20
封装: 6.50 X 4.40 MM, 0.92 MM PITCH, MO-153, TSSOP-20
文件页数: 3/16页
文件大小: 444K
代理商: ICS85304AG-01T
85304AG-01
www.icst.com/products/hiperclocks.html
REV. D JUNE 17, 2004
11
Integrated
Circuit
Systems, Inc.
ICS85304-01
LOW SKEW, 1-TO-5
DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER
3. Calculations and Equations.
LVPECL output driver circuit and termination are shown in
Figure 6.
To calculate worst case power dissipation into the load, use the following equations which assume a 50
load, and a termination
voltage of V
CC
- 2V.
For logic high, V
OUT
= V
OH_MAX
= V
CC_MAX
– 1.0V
(V
CC_MAX
- V
OH_MAX
) = 1.0V
For logic low, V
OUT
= V
OL_MAX
= V
CC_MAX
– 1.7V
(V
CC_MAX
- V
OL_MAX
) = 1.7V
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
– (V
CC_MAX
- 2V))/R
L
] * (V
CC_MAX
- V
OH_MAX
) = [(2V - (V
CC_MAX
- V
OH_MAX
))/R
L
] * (V
CC_MAX
- V
OH_MAX
) =
[(2V - 1V)/50
] * 1V = 20.0mW
Pd_L = [(V
OL_MAX
– (V
CC_MAX
- 2V))/R
L
] * (V
CC_MAX
- V
OL_MAX
) = [(2V - (V
CC_MAX
- V
OL_MAX
))/R
L
] * (V
CC_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 6. LVPECL DRIVER CIRCUIT AND TERMINATION
Q1
V
OUT
V
CC
RL
50
V
CC - 2V
ICS85304-01
LOW SKEW, 1-TO-5 DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER
TSD
IDT / ICS LOW SKEW, 1-TO-5 DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER
ICS85304-01
11
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ICS85304AG-01LFT 85304 SERIES, LOW SKEW CLOCK DRIVER, 5 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO20
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