VSC7146 datasheet(8/19 Pages) VITESSE

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VITESSE

SEMICONDUCTOR CORPORATION

Advance Product Information

VSC7146

2.5Gb/s, 20-Bit Transceiver

Page 8

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

8/28/00

G52162-0 Rev. 2.7

Figure 6: TBC and REF Timing Waveforms

Table 5: TBC and REF Requirements

Parameters

Description

Min

Max

Units

Conditions

Necessary lag time between TBC

and REF

—2.0

Measured from falling edge of REF to rising

edge of TBC.

Necessary lead time between

TBC and REF

—2.0

Measured from falling edge of REF to rising

edge of TBC.

Frequency Range

105

52.5

127

63.5

MHz

Range over which both transmit and receive

reference clocks on any link may be centered.

The figure on top relects TXMODE=1 and the

bottom one reflects TXMODE=0.

Frequency Offset

−100

+100

ppm

|TXTBC - RXTBC|

TL,TH

Pulse Width, Low / High

4.5

2.5

Low is measured from VIL(max) to VIL(max),

High is measured from VIH(min) to VIH(min).

Min measurement refers to TXMODE=0 and

Max measurement refers to TXMODE=1.

TBC and REF duty cycle

Measured at 1.5V.

TRCR,TRCF

TBC and REF rise and fall time

0.6

1.5

Between VIL(max) and VIH(min).

TBC

VIL(max)

VIH(min)

REF

TBC

REF

REF and TBC must not have their

opposing edges coincident within

2.0ns of each other.

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