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參數(shù)資料
| 型號(hào)： | IDT8535-01PGI |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時(shí)鐘及定時(shí) |
| 英文描述： | LOW SKEW, 1-TO-4 LVCMOS-TO-3.3V LVPECL FANOUT BUFFER |
| 中文描述： | 8535 SERIES, LOW SKEW CLOCK DRIVER, 4 TRUE OUTPUT(S), 4 INVERTED OUTPUT(S), PDSO20 |
| 封裝： | TSSOP-16 |
| 文件頁(yè)數(shù)： | 10/11頁(yè) |
| 文件大?。?/td> | 85K |
| 代理商： | IDT8535-01PGI |
10
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
IDT8535-01
LOW SKEW, 1-TO-4 LVCMOS-TO-3.3V LVPECL
CALCULATIONS AND EQUATIONS
V
DD
Q1
V
OUT
RL
50
V
DD
- 2V
LVPECL Output Driver Circuit and Termination
To calculate worst case power dissipation into the load, use the following equations, which assume a 50
load and a termnation voltage of V
DD
– 2V.
For Logic HIGH: V
OUT
= V
OH
_
MAX
= V
DD
_
MAX
– 1V.
(V
DD
_
MAX
– V
OH
_
MAX
) = 1V
For Logic LOW: V
OUT
= V
OL
_
MAX
= V
DD
_
MAX
– 1.7V.
(V
DD
_
MAX
– V
OL
_
MAX
) = 1.7V
Pd_H is power dissipation when the output drives HIGH.
Pd_L is power dissipation when the output drives LOW.
Pd_H = {[ V
OH
_
MAX
– (V
DD
_
MAX
– 2V)] / R
L
} *(V
DD
_
MAX
– V
OH
_
MAX
) = {[ 2V – (V
DD
_
MAX
– V
OH
_
MAX
)] / R
L
} *(V
DD
_
MAX
– V
OH
_
MAX
) = [( 2V – 1V) / 50
] *
1V = 20mW.
Pd_L = {[ V
OL
_
MAX
– (V
DD
_
MAX
– 2V)] / R
L
} *(V
DD
_
MAX
– V
OL
_
MAX
) = {[ 2V – (V
DD
_
MAX
– V
OL
_
MAX
)] / R
L
} *(V
DD
_
MAX
– V
OL
_
MAX
) = [( 2V – 1.7V) / 50
] *
1.7V = 10.2mW.
Total Power Dissipation per output pair = Pd_H + Pd_L = 30.2mW
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