vsc8163 Vitesse Semiconductor Corp, vsc8163 Datasheet - Page 6

• Manufacturer Part Number: vsc8163
• Description: Oc-48 16 1 Sonet/sdh Mux With Clock Generator
• Manufacturer: Vitesse Semiconductor Corp

Page 6
OC-48 16:1 SONET/SDH
MUX with Clock Generator
input signal swing should be centered about this common-mode reference voltage ( V
maximum allowable amplitude. For single-ended, DC-coupling operations, it is recommended that the user pro-
vides an external reference voltage. The external reference should have a nominal value equivalent to the com-
mon mode switch point of the DC-coupled signal, and can be connected to either side of the differential gate.
Power Supplies
use the device in an ECL environment with a negative 3.3V supply, then V
-3.3V. If used with V
recommended that the V
on each V
also be placed in parallel with the 0.1 F and 0.01 F capacitors mentioned above. Recommended capacitors are
low inductance ceramic SMT X7R devices. For the 0.1 F capacitor, a 0603 package should be used. The
0.01 F and 0.001 F capacitors can be either 0603 or 0402 packages.
the optimal jitter and loop bandwidth characteristics of the PLL contained in the VSC8163, the analog power
supply pins should be filtered from the main power supply with a 10 H C-L-C pi filter. If preferred, a ferrite
bead may be used to provide the isolation. The 0.1 F and 0.01 F decoupling capacitors are still required and
must be connected to the supply pins between the device and the C-L-C pi filter (or ferrite bead).
main +3.3V power supply and placed close to the C-L-C pi filter.
V
CC
Extra care needs to be taken when decoupling the analog power supply pins (V
For low frequency decoupling, 47 F tantalum low inductance SMT caps are sprinkled over the board’s
If the device is being used in an ECL environment with a -3.3V supply, then all references to decoupling
This device is specified as a LVPECL device with a single positive 3.3V supply. Should the user desire to
Decoupling of the power supplies is a critical element in maintaining the proper operation of the part. It is
must be changed to V
CC
power supply pin as close to the package as possible. If room permits, a 0.001 F capacitor should
EE
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
V
tied to -3.3V, the TTL control signals are still referenced to V
CC
CC
EE
Figure 8: PLL Power Supply Decoupling Scheme
power supply be decoupled using a 0.1 F and 0.01 F capacitor placed in parallel
Tel: (800) VITESSE • FAX: [phone] • Email: [e-mail]
, and all references to decoupling 3.3V must be changed to -3.3V.
10µF
VITESSE
SEMICONDUCTOR CORPORATION
0.1µF
V
EE
Internet: www.vitesse.com
10µH
V
0.1µF
EE_ANA
0.01µF
CC
will be ground and V
V
CC_ANA
CCANA
Preliminary Data Sheet
EE
CMI
.
). In order to maintain
) and not exceed the
VSC8163
EE
G52216-0, Rev 3.3
will be
01/05/00