vsc8131 Vitesse Semiconductor Corp, vsc8131 Datasheet - Page 5

• Manufacturer Part Number: vsc8131
• Description: 2.488 Gbit/sec 32 1 Sonet/sdh Mux With Clock Generator
• Manufacturer: Vitesse Semiconductor Corp

VSC8131
Preliminary Datasheet
11/9/99
G52249-0, Rev. 3.0
Supplies
V
3.3V supply, then V
are still referenced to V
recommended that the V
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 0403 packages.
maintain the optimal jitter and loop bandwidth characteristics of the PLL contained in the VSC8131, 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.
pling V
CC
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 negative 3.3V supply, then all references to decou-
This device is specified as a LVPECL device with a single +3.3V supply. Normal operation is to have
Decoupling of the power supplies is a critical element in maintaining the proper operation of the part. It is
Extra care needs to be taken when decoupling the analog power supply pins (labeled V
=+3.3V and V
CC
CC
power supply pin as close to the package as possible. If room permits, a 0.001 F capacitor should
must be changed to V
EE
CC
=ground. Should the user desire to use the device in an ECL environment with a negative
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: [phone]
will be ground and V
EE
CC
.
power supply be decoupled using a 0.1 F and 0.01 F capacitor placed in parallel on
EE
VITESSE
VITESSE SEMICONDUCTOR CORPORATION
SEMICONDUCTOR CORPORATION
, and all references to decoupling +3.3V must be changed to -3.3V.
EE
will be -3.3V. If used with V
32:1 SONET/SDH Mux with Clock Generator
EE
tied to -3.3V, the TTL I/O signals
CCANA
2.488 Gbit/sec
). In order to
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