ICS85354AK ICST [Integrated Circuit Systems], ICS85354AK Datasheet - Page 13

• Manufacturer Part Number: ICS85354AK
• Description: DUAL 2:1/1:2 DIFFERENTIAL -TO-LVPECL/ECL MULTIPLEXER
• Manufacturer: ICST [Integrated Circuit Systems]

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