ICS8521BY IDT, Integrated Device Technology Inc, ICS8521BY Datasheet - Page 11

• Manufacturer Part Number: ICS8521BY
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock Driverr

Specifications of ICS8521BY

• Number Of Clock Inputs: 2
• Mode Of Operation: Differential
• Output Frequency: 500MHz
• Output Logic Level: HSTL
• Operating Supply Voltage (min): 3.135V
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.465V
• Package Type: LQFP
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 32
• Lead Free Status / RoHS Status: Not Compliant

ICS8521
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 = (1.0V/50Ω) * (2V - 1.0V) = 20mW
Pd_L = (0.4V/50Ω) * (2V - 0.4V) = 12.8mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 32.8mW
www.idt.com
8521BY
REV. E JULY 25, 2010
11