ics8535agi-31 Integrated Device Technology, ics8535agi-31 Datasheet - Page 10

• Manufacturer Part Number: ics8535agi-31
• Description: Lvcmos And Xtal Input Lvpecl Output 1 4 266-mhz Fanout Buffer
• Manufacturer: Integrated Device Technology

IDT™ / ICS™ LOW SKEW, 1-TO-4, CRYSTAL OSCILLATOR/ LVCMOS-TO-3.3V LVPECL FANOUT BUFFER
ICS8535-31
LOW SKEW, 1-TO-4, CRYSTAL OSCILLATOR/ LVCMOS-TO-3.3V LVPECL FANOUT BUFFER
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
8535AG-31
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
Integrated
Circuit
Systems, Inc.
– (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
F
L
] * (V
] * (V
IGURE
= V
= V
CC_MAX
CC_MAX
CC_MAX
CC_MAX
4. LVPECL D
www.icst.com/products/hiperclocks.html
– 1.7V
- V
- V
– 0.9V
OL_MAX
OH_MAX
) = [(2V - (V
) = [(2V - (V
RIVER
V
Q1
CC
LVCMOS-
10
10
C
CC _MAX
CC _MAX
IRCUIT AND
L
OW
- V
- V
OL_MAX
OH_MAX
S
TO
KEW
T
RL
V
50
ERMINATION
)) /R
CC
)) /R
-3.3V LVPECL F
- 2V
V
L
, 1-
] * (V
L
OUT
] * (V
TO
CC_MAX
CC_MAX
-4, C
- V
- V
OL_MAX
OH_MAX
RYSTAL
) =
) =
ANOUT
O
REV. B APRIL 29, 2005
SCILLATOR
B
UFFER
ICS8535-31
TSD
/