ICS85357AG-11T IDT, Integrated Device Technology Inc, ICS85357AG-11T Datasheet - Page 8

• Manufacturer Part Number: ICS85357AG-11T
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock Multiplexerr

Specifications of ICS85357AG-11T

• Number Of Clock Inputs: 4
• Mode Of Operation: Single-Ended
• Output Logic Level: ECL/LVPECL
• Operating Supply Voltage (min): -3.135/3.135V
• Operating Supply Voltage (typ): -3.3/3.3V
• Operating Supply Voltage (max): -3.465/3.465V
• Package Type: TSSOP
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 20
• Lead Free Status / RoHS Status: Not 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 3.
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
85357AG-11
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
CCO_MAX
CCO_MAX
CC
- 2V.
– (V
– (V
- V
- V
CC_MAX
OH_MAX
OL_MAX
CC_MAX
OUT
OUT
) = 1.7V
- 2V))/R
) = 0.9V
- 2V))/R
= V
= V
OL_MAX
OH_MAX
L
L
F
] * (V
] * (V
IGURE
= V
= V
CC_MAX
CC_MAX
CC_MAX
CC_MAX
3. LVPECL D
– 1.7V
- V
- V
– 0.9V
OL_MAX
OH_MAX
) = [(2V - (V
) = [(2V - (V
www.idt.com
RIVER
V
Q1
CC
8
C
CC _MAX
CC _MAX
4:1
IRCUIT AND
- V
- V
OR
OL_MAX
OH_MAX
2:1, C
T
RL
V
50
)) /R
ERMINATION
CC
)) /R
- 2V
V
L
] * (V
L
LVPECL / ECL M
OUT
] * (V
RYSTAL
CC_MAX
CC_MAX
- V
- V
OL_MAX
O
OH_MAX
ICS85357-11
SCILLATOR
) =
) =
REV. D OCTOBER 4, 2010
ULTIPLEXER
-
TO
-3.3V