參數(shù)資料
型號: 5222A01
英文描述: DUAL LVCMOS / LVTTL-TO DIFFERENTIAL
中文描述: 雙的LVCMOS / LVTTL,差分
文件頁數(shù): 9/13頁
文件大?。?/td> 156K
代理商: 5222A01
85222AM-01
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 15, 2005
9
Integrated
Circuit
Systems, Inc.
ICS85222-01
D
UAL
LVCMOS / LVTTL-
TO
-
D
IFFERENTIAL
HSTL T
RANSLATOR
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 3.
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_M
AX
/R
L
) * (V
DD_MAX
- V
OH_M
AX
)
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
3. HSTL D
RIVER
C
IRCUIT
AND
T
ERMINATION
V
DD
V
OUT
RL
50
Ω
Q1
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