VITESSE

SEMICONDUCTOR CORPORATION

reliminary Datasheet

SC8164

2.488 Gbit/sec to 2.7Gbit/sec

1:16 SONET/SDH Demux

G52239-0, Rev. 3.3

 VITESSE SEMICONDUCTOR CORPORATION

Page 1

5/17/00

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

Features

General Description

The VSC8164 is a 1:16 demultiplexer for use in SONET/SDH systems operating at a standard 2.488Gb/s

data rate or forward error correction (FEC) data rate up to 2.7Gb/s. The device operates using a single 3.3V

power supply, and is packaged in a thermally enhanced plastic package. The thermal performance of the

128PQFP allows the use of the VSC8164 without a heat sink under most thermal conditions.

VSC8164 Block DIagram

Functional Description

Low Speed Interface

The demultiplexed serial stream is made available by a 16 bit differential LVPECL interface D[15:0] with

speed LVPECL output drivers are designed to drive a 50

Ω transmission line. The transmission line can be DC

terminated with a split end termination scheme (see Figure 1), or DC terminated by 50

Ω to V

(see Figure 2). At any time, the equivalent split-end termination technique can be substituted for the traditional

50

Ω to V

coupling method for the occasion when the downstream device provides the bias point for AC coupling. If the

downstream device were to have internal termination, the line to line 100

Ω resistor may not be necessary. The

divide by 32 output can be used to provide a reference clock for the clock multiplication unit on the VSC8163.

• 2.488Gb/s 1:16 Demultiplexer

• Targeted for SONET OC-48 / SDH STM-16

Applications

• Supports FEC rates up to 2.7Gb/s

• Differential LVPECL Low Speed Interface

• Single +3.3V Supply

• 128 Pin 14x20mm PQFP Package

D0+

D0-

D15+

D15-

CLK16O+

CLK16O-

DI+

DI-

HSCLKI+

HSCLKI-

Divide by

16

CLK32O+

CLK32O-

Divide by

2