ICS8530DY IDT, Integrated Device Technology Inc, ICS8530DY Datasheet - Page 11

• Manufacturer Part Number: ICS8530DY
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of ICS8530DY

• Number Of Outputs: 32
• Operating Supply Voltage (max): 3.465V
• Operating Temp Range: 0C to 70C
• Propagation Delay Time: 2ns
• Operating Supply Voltage (min): 3.135V
• Mounting: Surface Mount
• Pin Count: 48
• Operating Supply Voltage (typ): 3.3V
• Package Type: LQFP
• Duty Cycle: 53%
• Operating Temperature Classification: Commercial
• Lead Free Status / Rohs Status: Not Compliant

ICS8530 Data Sheet
3. Calculations and Equations.
The purpose of this section is to calculate the power dissipation for the LVPECL output pairs.
LVPECL output driver circuit and termination are shown in Figure 4.
Figure 4. LVPECL Driver Circuit and Termination
T
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 – 0.7V)/50Ω] * 0.7V = 18.2mW
Pd_L = [(V
[(2V – 1.4V)/50Ω] * 1.4V = 16.8mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 35mW
ICS8530DY REVISION E SEPTEMBER 15, 2010
o calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination voltage of
CCO
•
•
– 2V.
For logic high, V
(V
For logic low, V
(V
OL_MAX
OH_MAX
CCO_MAX
CCO_MAX
– (V
– (V
– V
– V
CCO_MAX
CCO_MAX
OH_MAX
OUT
OL_MAX
OUT
= V
V
= V
Q1
CCO
) = 1.4V
) = 0.7V
OL_MAX
– 2V))/R
– 2V))/R
OH_MAX
= V
L
= V
L
] * (V
] * (V
CCO_MAX
CCO_MAX
COC_MAX
CCO_MAX
RL
50Ω
V
CCO
– 1.4V
– 0.7V
-
V
2V
– V
OUT
– V
OL_MAX
OH_MAX
) = [(2V – (V
) = [(2V – (V
11
LOW SKEW, 1-TO-16, DIFFERENTIAL-TO-2.5V LVPECL FANOUT BUFFER
CCO_MAX
CCO_MAX
– V
– V
OL_MAX
OH_MAX
))/R
))/R
L]
L
* (V
] * (V
©2010 Integrated Device Technology, Inc.
CCO_MAX
CCO_MAX
– V
– V
OL_MAX
OH_MAX
) =
) =