ICS85354AK ICST [Integrated Circuit Systems], ICS85354AK Datasheet - Page 13
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ICS85354AK
Manufacturer Part Number
ICS85354AK
Description
DUAL 2:1/1:2 DIFFERENTIAL -TO-LVPECL/ECL MULTIPLEXER
Manufacturer
ICST [Integrated Circuit Systems]
Datasheet
1.ICS85354AK.pdf
(16 pages)
3. Calculations and Equations.
The purpose of this section is to derive the power dissipated into the load.
LVPECL output driver circuit and termination are shown in Figure 5.
T
voltage of V
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = [(V
[(2V - 1.005V)/50Ω] * 1.005V = 20mW
Pd_L = [(V
[(2V - 1.78V)/50Ω] * 1.78V = 7.83mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 27.83mW
85354AK
o calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination
•
•
For logic high, V
(V
For logic low, V
(V
OL_MAX
OH_MAX
CC_MAX
CC_MAX
CC
- 2V.
Integrated
Circuit
Systems, Inc.
– (V
– (V
- V
- V
OH_MAX
OL_MAX
CC_MAX
CC_MAX
OUT
OUT
) = 1.78V
) = 1.005
- 2V))/R
- 2V))/R
= V
= V
OL_MAX
OH_MAX
L
L
] * (V
] * (V
F
= V
IGURE
= V
CC_MAX
CC_MAX
CC_MAX
CC_MAX
5. LVPECL D
www.icst.com/products/hiperclocks.html
– 1.78V
- V
PRELIMINARY
- V
– 1.005V
OL_MAX
OH_MAX
) = [(2V - (V
) = [(2V - (V
Q1
VCC
RIVER
D
13
IFFERENTIAL
CC_MAX
CC_MAX
C
IRCUIT AND
- V
- V
OL_MAX
OH_MAX
RL
50
T
)) /R
)) /R
-
VCC - 2V
ERMINATION
TO
L
] * (V
L
] * (V
-LVPECL/ECL M
VOUT
CC_MAX
CC_MAX
- V
- V
OL_MAX
OH_MAX
) =
) =
ICS85354
D
UAL
REV. B JUNE 8, 2004
ULTIPLEXER
2:1/1:2