8523BGLF Integrated Device Technology (Idt), 8523BGLF Datasheet - Page 14

• Manufacturer Part Number: 8523BGLF
• Description: Clock Driver 2-IN HSTL 20-Pin TSSOP Tube
• Manufacturer: Integrated Device Technology (Idt)

Specifications of 8523BGLF

• Package: 20TSSOP
• Configuration: 1 x 2:1
• Input Signal Type: CML|HCSL|HSTL|LVDS|LVPECL|SSTL
• Maximum Output Frequency: 650 MHz
• Operating Supply Voltage: 3.3 V

ICS8523 Data Sheet
3. Calculations and Equations.
The purpose of this section is to calculate the power dissipation for the HSTL output pair.
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
ICS8523CG REVISION E JANUARY 24, 2011
o calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load.
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
14
LOW SKEW, 1-TO-4, DIFFERENTIAL-TO-HSTL FANOUT BUFFER
©2011 Integrated Device Technology, Inc.