© VITESSE SEMICONDUCTOR CORPORATION

Page 5

11/9/99

741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Datasheet

VSC8166

2.488 Gbit/sec

1:16 SONET/SDH Demux with Clock Recovery

G52252-0, Rev. 3.0

Figure 5: High Speed Serial Data Inputs

Supplies

This device is specified as a LVPECL device with a single positive 3.3V supply. Should the user desire to

use the device in a ECL environment with a negative 3.3V supply, then VCC will be ground and VEE will be -

3.3V.

Decoupling of the power supplies is a critical element in maintaining the proper operation of the part. It is

also be placed in parallel with the 0.1

µF and 0.01µF capacitors mentioned above. Recommended capacitors are

low inductance ceramic SMT X7R devices. For the 0.1

µF capacitor, a 0603 package should be used. The

0.01

µF and 0.001µF capacitors can be either 0603 or 0403 packages.

For low frequency decoupling, 47

µF tantalum low inductance SMT caps should be sprinkled over the

board’s main +3.3V power supply and placed close to the C-L-C pi filter.

If the device is being used in an ECL environment with a -3.3V supply, then all references to decoupling

Chip Boundary

50

Ω

50

Ω