8533AG-01LFT IDT, 8533AG-01LFT Datasheet - Page 12

• Manufacturer Part Number: 8533AG-01LFT
• Description: Clock Drivers & Distribution 1-to-4 LVPECL Fanout Buffer
• Manufacturer: IDT

Specifications of 8533AG-01LFT

• Rohs: yes
• Part # Aliases: ICS8533AG-01LFT

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)/50 ] * 0.9V = 19.8mW
Pd_L = [(V
[(2V - 1.7V)/50 ] * 1.7V = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW
8533AG-01
o calculate worst case power dissipation into the load, use the following equations which assume a 50 load, and a termination
•
•
For logic high, V
(V
For logic low, V
(V
OL_MAX
OH_MAX
CC
CC_MAX
CC_MAX
- 2V.
– (V
– (V
- V
- V
OH_MAX
OL_MAX
CC_MAX
CC_MAX
OUT
OUT
) = 1.7V
) = 0.9V
- 2V))/R
- 2V))/R
= V
= V
OL_MAX
OH_MAX
L
F
L
] * (V
] * (V
IGURE
= V
= V
CC_MAX
CC_MAX
CC_MAX
CC_MAX
6. LVPECL D
- V
– 1.7V
- V
– 0.9V
OL_MAX
OH_MAX
) = [(2V - (V
) = [(2V - (V
D
www.idt.com
RIVER
V
IFFERENTIAL
Q1
CC
12
C
CC_MAX
CC_MAX
IRCUIT AND
- V
- V
OL_MAX
OH_MAX
-
TO
RL
T
V
50
ERMINATION
)) /R
CC
-3.3V LVPECL F
)) /R
- 2V
V
L
OUT
] * (V
L
] * (V
CC_MAX
CC_MAX
- V
- V
OL_MAX
OH_MAX
L
ICS8533-01
OW
) =
) =
ANOUT
S
KEW
REV. F AUGUST 4, 2010
, 1-
B
UFFER
TO
-4