ics8536-01 Integrated Device Technology, ics8536-01 Datasheet - Page 15

• Manufacturer Part Number: ics8536-01
• Description: Xtal, Lvcmos, Differential Input Lvpecl Output 1 6 266-mhz Buffer
• Manufacturer: Integrated Device Technology

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 6.
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
ICS8536-01
LOW SKEW, 1-TO-6, CRYSTAL/LVCMOS/DIFFERENTIAL-TO-3.3V, 2.5V LVPECL FANOUT BUFFER
™
•
•
/ ICS
For logic high, V
(V
For logic low, V
(V
™
OL_MAX
3.3V, 2.5V LVPECL FANOUT BUFFER
CC_MAX
CC_MAX
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
CC_MAX
F
IGURE
- V
- V
– 1.7V
OL_MAX
– 0.9V
OH_MAX
6. LVPECL D
) = [(2V - (V
) = [(2V - (V
CC _MAX
CC _MAX
RIVER
V
Q1
CC
- V
15
- V
OL_MAX
OH_MAX
C
IRCUIT AND
)) /R
)) /R
L
] * (V
L
] * (V
CC_MAX
T
CC_MAX
RL
V
50
ERMINATION
CC
- V
- 2V
- V
V
OUT
OL_MAX
OH_MAX
) =
) =
ICS8536AG-01 REV. B NOVEMBER 3, 2006
load, and a termination
PRELIMINARY