ICS8535AG-21 ICST [Integrated Circuit Systems], ICS8535AG-21 Datasheet - Page 11

• Manufacturer Part Number: ICS8535AG-21
• Description: LOW SKEW, 1-TO-2 LVCMOS/LVTTL-TO-3.3V LVPECL FANOUT BUFFER
• Manufacturer: ICST [Integrated Circuit Systems]

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
termination 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
8535AG-21
o calculate worst case power dissipation into the load, use the following equations which assume a 50 load, and a
•
•
For logic high, V
(V
For logic low, V
(V
OL_MAX
OH_MAX
CC_MAX
CC_MAX
– (V
Integrated
Circuit
Systems, Inc.
– (V
- V
- V
OH_MAX
OL_MAX
CC_MAX
CC_MAX
CC
OUT
OUT
) = 1.7V
- 2V.
) = 0.9V
- 2V))/R
- 2V))/R
= V
= V
OL_MAX
OH_MAX
L
L
] * (V
F
] * (V
IGURE
= V
= V
CC_MAX
CC_MAX
CC_MAX
CC_MAX
4. LVPECL D
www.icst.com/products/hiperclocks.html
- V
– 1.7V
- V
– 0.9V
OL_MAX
OH_MAX
LVCMOS/LVTTL-
) = [(2V - (V
) = [(2V - (V
RIVER
V
Q1
CC
11
C
CC_MAX
CC_MAX
IRCUIT AND
- V
- V
OL_MAX
OH_MAX
TO
T
RL
V
ERMINATION
50
)) /R
)) /R
-3.3V LVPECL F
CC
- 2V
V
L
] * (V
L
OUT
] * (V
CC_MAX
CC_MAX
- V
- V
OL_MAX
OH_MAX
L
ICS8535-21
) =
OW
) =
ANOUT
S
REV. A OCTOBER 20, 2004
KEW
, 1-
B
UFFER
TO
-2