ICS8533AGI-31 IDT, Integrated Device Technology Inc, ICS8533AGI-31 Datasheet - Page 11

• Manufacturer Part Number: ICS8533AGI-31
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock Driverr

Specifications of ICS8533AGI-31

• Number Of Clock Inputs: 2
• Mode Of Operation: Differential
• Output Frequency: 650MHz
• Output Logic Level: LVPECL
• Operating Supply Voltage (min): 3.135V
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.465V
• Package Type: TSSOP
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 20
• Lead Free Status / RoHS Status: Supplier Unconfirmed

Termination for 3.3V LVPECL Outputs
The clock layout topology shown below is a typical termination for
LVPECL outputs. The two different layouts mentioned are
recommended only as guidelines.
FOUT and nFOUT are low impedance follower outputs that
generate ECL/LVPECL compatible outputs. Therefore, terminating
resistors (DC current path to ground) or current sources must be
used for functionality. These outputs are designed to drive 50Ω
Figure 6A. 3.3V LVPECL Output Termination
IDT™ / ICS™ 3.3V LVPECL FANOUT BUFFER
ICS8533I-31
LOW SKEW, 1-TO-4, CRYSTAL OSCILLATOR/DIFFERENTIAL-TO- 3.3V LVPECL FANOUT BUFFER
RTT =
((V
FOUT
OH
+ V
OL
) / (V
1
CC
Z
Z
– 2)) – 2
o
o
= 50Ω
= 50Ω
Z
o
50Ω
RTT
50Ω
V
CC
FIN
- 2V
11
transmission lines. Matched impedance techniques should be
used to maximize operating frequency and minimize signal
distortion. Figures 6A and 6B show two different layouts which are
recommended only as guidelines. Other suitable clock layouts may
exist and it would be recommended that the board designers
simulate to guarantee compatibility across all printed circuit and
clock component process variations.
Figure 6B. 3.3V LVPECL Output Termination
FOUT
Z
Z
ICS8533AGI-31 REV. A DECEMBER 13, 2007
o
o
= 50Ω
= 50Ω
125Ω
84Ω
3.3V
125Ω
84Ω
PRELIMINARY
FIN