852911AVILF IDT, 852911AVILF Datasheet - Page 11

• Manufacturer Part Number: 852911AVILF
• Description: Clock Drivers & Distribution
• Manufacturer: IDT

Specifications of 852911AVILF

• Product Category: Clock Drivers & Distribution
• Rohs: yes
• Part # Aliases: ICS852911AVILF

ICS852911I
L
S
, 1-
-9
OW
KEW
TO
D
-
-HSTL F
B
IFFERENTIAL
TO
ANOUT
UFFER
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 5.
V
DDO
Q1
V
OUT
RL
50Ω
F
5. HSTL D
C
T
IGURE
RIVER
IRCUIT AND
ERMINATION
T
o calculate worst case power dissipation into the load, use the following equations which assume a 50Ω 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
/R
) * (V
- V
)
OH_MAX
L
DDO_MAX
OH_MAX
Pd_L = (V
/R
) * (V
- V
)
OL_MAX
L
DDO_MAX
OL_MAX
Pd_H = (1.4V/50Ω) * (3.6V - 1.4V) = 61.6mW
Pd_L = (0.4V/50Ω) * (3.6V - 0.4V) = 25.6mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 87.2mW
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852911AVI
REV. A AUGUST 5, 2010
11