ics8531-01 Integrated Device Technology, ics8531-01 Datasheet - Page 13

• Manufacturer Part Number: ics8531-01
• Description: Differential Input Lvpecl Output 1 9 500-mhz Fanout Buffer
• Manufacturer: Integrated Device Technology

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 6.
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 - 0.9V)/50Ω] * 0.9V = 19.8mW
Pd_L = [(V
[(2V - 1.7V)/50Ω] * 1.7V = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW
IDT
o calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination
ICS8531-01
LOW SKEW, 1-TO-9, DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER
™
•
•
/ ICS
For logic high, V
(V
For logic low, V
(V
™
OL_MAX
CCO_MAX
CCO_MAX
1-TO-9, 3.3V LVPECL FANOUT BUFFER
OH_MAX
CCO
- 2V.
– (V
– (V
- V
- V
CCO_MAX
OH_MAX
OL_MAX
CCO_MAX
) = 1.7V
) = 0.9V
OUT
- 2V))/R
OUT
- 2V))/R
= V
= V
OL_MAX
OH_MAX
L
L
] * (V
] * (V
= V
F
= V
IGURE
CCO_MAX
CCO_MAX
CCO_MAX
CCO_MAX
6. LVPECL D
- V
– 1.7V
- V
– 0.9V
OL_MAX
OH_MAX
) = [(2V - (V
) = [(2V - (V
RIVER
V
Q1
CCO
CCO_MAX
CCO_MAX
C
IRCUIT AND
13
- V
- V
OL_MAX
OH_MAX
)) /R
)) /R
T
R L
V
ERMINATION
50
L
CCO
] * (V
L
] * (V
V
- 2V
OUT
CCO_MAX
CCO_MAX
- V
- V
OL_MAX
OH_MAX
) =
) =
ICS8531AY-01 REV. F APRIL 11, 2007