87354AMILFT IDT, Integrated Device Technology Inc, 87354AMILFT Datasheet - Page 10

• Manufacturer Part Number: 87354AMILFT
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock Dividerr

Specifications of 87354AMILFT

• Number Of Clock Inputs: 1
• Mode Of Operation: Differential
• Output Logic Level: LVPECL
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (typ): 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 4.
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
87354AMI
o calculate worst case power dissipation into the load, use the following equations which assume a 50 load, and a termination
•
•
For logic high, V
(V
For logic low, V
(V
OL_MAX
OH_MAX
CC_MAX
CC_MAX
CC
- 2V.
– (V
– (V
- V
- V
OH_MAX
OL_MAX
CC_MAX
CC_MAX
OUT
OUT
) = 1.7V
) = 0.9V
- 2V))/R
- 2V))/R
= V
= V
OL_MAX
OH_MAX
L
L
] * (V
] * (V
= V
F
= V
IGURE
CC_MAX
CC_MAX
CC_MAX
CC_MAX
4. LVPECL D
– 1.7V
- V
- V
– 0.9V
OL_MAX
OH_MAX
) = [(2V - (V
) = [(2V - (V
www.idt.com
RIVER
V
Q1
CC
10
C
CC _MAX
IRCUIT AND
CC _MAX
- V
- V
OL_MAX
OH_MAX
T
3.3V LVPECL C
ERMINATION
RL
V
50
)) /R
CC
)) /R
- 2V
V
L
] * (V
OUT
L
] * (V
CC_MAX
CC_MAX
÷4/÷5 D
- V
- V
OL_MAX
OH_MAX
) =
LOCK
) =
ICS87354I
IFFERENTIAL
REV. A AUGUST 5, 2010
G
ENERATOR
-
TO
-