ICS87321AMILF IDT, Integrated Device Technology Inc, ICS87321AMILF Datasheet - Page 13

• Manufacturer Part Number: ICS87321AMILF
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock Dividerr

Specifications of ICS87321AMILF

• Number Of Clock Inputs: 1
• Mode Of Operation: Differential
• Output Logic Level: LVPECL
• Operating Supply Voltage (min): 2.375V
• Operating Supply Voltage (typ): 2.5/3.3V
• Operating Supply Voltage (max): 3.465V
• Package Type: SOIC N
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 8
• Lead Free Status / Rohs Status: Compliant

3. Calculations and Equations.
The purpose of this section is to derive the power dissipated into the load.
LVPECL output driver circuit and termination are shown in Figure 5.
T
voltage of 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 – 0.9V)/50 ] * 0.9V = 19.8mW
Pd_L = [(V
[(2V – 1.7V)/50 ] * 1.7V = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW
IDT
o calculate worst case power dissipation into the load, use the following equations which assume a 50
ICS87321I
÷1, ÷2 DIFFERENTIAL-TO-3.3V LVPECL CLOCK GENERATOR
™
•
•
/ ICS
For logic high, V
(V
For logic low, V
(V
™
OL_MAX
CC_MAX
CC_MAX
3.3V LVPECL CLOCK GENERATOR
OH_MAX
CC
– 2V.
– (V
– (V
– V
– V
OH_MAX
OL_MAX
CC_MAX
CC_MAX
) = 1.7V
) = 0.9V
- 2V))/R
OUT
– 2V))/R
OUT
= V
= V
OL_MAX
OH_MAX
L
] * (V
L
] * (V
= V
= V
CC_MAX
CC_MAX
CC_MAX
CC_MAX
F
IGURE
– V
– V
– 1.7V
– 0.9V
OL_MAX
OH_MAX
5. LVPECL D
) = [(2V – (V
) = [(2V – (V
CC _MAX
CC _MAX
RIVER
V
Q1
CC
13
– V
– V
C
OL_MAX
IRCUIT AND
OH_MAX
)) /R
)) /R
L
] * (V
L
] * (V
T
RL
V
CC_MAX
ERMINATION
50
CC
CC_MAX
- 2V
V
– V
OUT
– V
OL_MAX
OH_MAX
) =
) =
ICS87321AMI REV. A APRIL 7, 2009
load, and a termination