© VITESSE SEMICONDUCTOR CORPORATION

Page 7

8/28/00

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

VITESSE

SEMICONDUCTOR CORPORATION

Advance Product Information

VSC7146

2.5Gb/s, 20-Bit Transceiver

G52162-0, Rev. 2.7

Figure 5: Receive Timing Waveforms

Table 4: Receive AC Characteristics

Paramete

rs

Description

Min.

Max.

Units

Conditions

Data or COM_DET valid prior to

RBCN rise

1.0

2.0

—ns

Measured between the 1.4V point of

RBCN and a valid level of R[0:19] or

COM_DET. All outputs driving 10pF load.

The spec on top relects RXMODE=1 and

the bottom one reflects RXMODE=0.

Data or COM_DET valid after

RBCN rise

5.0

10.0

—ns

Time difference between RBC and

RBCN edges

—1

ns

RBC/RBCN rise and fall time

0.6

2.0

ns

10pF load.

R[0:19], COM_DET rise and fall

time

0.7

2.4

ns

10pF load.

Latency from RX to R[0:19]

36bc+

2ns

56bc+

2ns

Bit

Clocks

When locked to valid data.

RBC period

7.9

15.8

8.1

16.2

ns

The spec on top relects RXMODE=1 and

the bottom one reflects RXMODE=0.

DC

RBC duty cycle

40%

60%

period

Data acquisition lock time @

2.5Gb/s

—1250

Bit

Clocks

Tested on a sample basis. 95% probability

of lock.

RBCN

R[0:19] and

Data Valid

Data Valid

Data Valid

COM_DET

RBC