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參數(shù)資料
| 型號： | IDT8737-11PGI8 |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時鐘及定時 |
| 英文描述： | 8737 SERIES, LOW SKEW CLOCK DRIVER, 4 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO20 |
| 封裝： | TSSOP-20 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 98K |
| 代理商： | IDT8737-11PGI8 |
11
COMMERCIALANDINDUSTRIALTEMPERATURERANGES
IDT8737-11
LOW SKEW,
÷÷÷÷÷1/÷÷÷÷÷2 DIFFERENTIAL-TO-3.3V LVPECL
CALCULATIONS AND EQUATIONS
VDD
Q1
VOUT
RL
50
VDD - 2V
LVPECL Output Driver Circuit and Termination
To calculate worst case power dissipation into the load, use the following equations, which assume a 50
Ω load and a termination voltage of VDD – 2V.
For Logic HIGH: VOUT = VOH_MAX = VDD_MAX – 1V.
(VDD_MAX – VOH_MAX) = 1V
For Logic LOW: VOUT = VOL_MAX = VDD_MAX – 1.7V.
(VDD_MAX – VOL_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 = {[ VOH_MAX – (VDD_MAX – 2V)] / RL} * (VDD_MAX – VOH_MAX) = {[ 2V – (VDD_MAX – VOH_MAX)] / RL} * (VDD_MAX – VOH_MAX) = [( 2V – 1V) / 50
Ω] *
1V = 20mW.
Pd_L = {[ VOL_MAX – (VDD_MAX – 2V)] / RL} * (VDD_MAX – VOL_MAX) = {[ 2V – (VDD_MAX – VOL_MAX)] / RL} * (VDD_MAX – VOL_MAX) = [( 2V – 1.7V) / 50
Ω] *
1.7V = 10.2mW.
Total Power Dissipation per output pair = Pd_H + Pd_L = 30.2mW
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