8535AG-01LF Integrated Device Technology (Idt), 8535AG-01LF Datasheet - Page 11

• Manufacturer Part Number: 8535AG-01LF
• Description: Clock Driver 2-IN LVPECL 20-Pin TSSOP Tube
• Manufacturer: Integrated Device Technology (Idt)

Specifications of 8535AG-01LF

• Package: 20TSSOP
• Configuration: 1 x 2:1
• Input Signal Type: LVCMOS|LVTTL
• Maximum Output Frequency: 266 MHz
• Operating Supply Voltage: 3.3 V

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
IDT
o calculate worst case power dissipation into the load, use the following equations which assume a 50
ICS8535-01
LOW SKEW, 1-to-4 LVCMOS/LVTTL-TO-3.3V LVPECL FANOUT BUFFER
™
•
•
/ ICS
For logic high, V
(V
For logic low, V
(V
™
OL_MAX
CC_MAX
CC_MAX
3.3V LVPECL FANOUT BUFFER
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
L
] * (V
] * (V
= V
= V
CC_MAX
CC_MAX
CC_MAX
F
CC_MAX
IGURE
- V
- V
– 1.7V
OL_MAX
– 0.9V
OH_MAX
4. LVPECL D
) = [(2V - (V
) = [(2V - (V
CC_MAX
CC_MAX
RIVER
V
Q1
CC
- V
11
- V
OL_MAX
C
OH_MAX
IRCUIT AND
)) /R
)) /R
L
] * (V
L
] * (V
T
RL
CC_MAX
V
50
CC_MAX
ERMINATION
CC
- 2V
- V
V
- V
OUT
OL_MAX
OH_MAX
) =
) =
ICS8535AG-01 REV. F APRIL 12, 2007
load, and a termination