ICS8523BG IDT, Integrated Device Technology Inc, ICS8523BG Datasheet - Page 13

• Manufacturer Part Number: ICS8523BG
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock Driverr

Specifications of ICS8523BG

• Number Of Clock Inputs: 2
• Mode Of Operation: Differential
• Output Frequency: 650MHz
• Output Logic Level: HSTL
• Operating Supply Voltage (min): 3.135V
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.465V
• Package Type: TSSOP
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 20
• Lead Free Status / RoHS Status: Not Compliant

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 6.
Figure 6. HSTL Driver Circuit and Termination
T
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = (V
Pd_L = (V
Pd_H = (0.9V/50Ω) * (2V - 0.9V) = 19.8mW
Pd_L = (0.4V/50Ω) * (2V - 0.4V) = 12.8mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 32.6mW
IDT™ / ICS™ HSTL FANOUT BUFFER
o calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load.
ICS8523
LOW SKEW, 1-TO-4, DIFFERENTIAL-TO-HSTL FANOUT BUFFER
OL_MAX
OH_MAX
/R
/R
L
) * (V
L
) * (V
DDO_MAX
DDO_MAX
V
Q1
DDO
- V
- V
OL_MAX
OH_MAX
)
)
RL
50Ω
V
OUT
13
ICS8523CGREV. D MARCH 13, 2007