VSC7140QJ datasheet(5/12 Pages) VITESSE

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VITESSE

SEMICONDUCTOR CORPORATION

Data Sheet

VSC7140

1.0625 Gb/s Fibre Channel

Dual Repeater / Hub Node

G52180-0, Rev 4.0

Page 5

10/23/00

VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012

Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com

Internet: www.vitesse.com

AC Characteristics

Figure 3: AC Timing Diagrams

Table 1: AC Characteristics (Over recommended operating conditions).

Parameters

Description

Min.

Max.

Units

Conditions

Differential Inputs/Outputs

Latency from Serial Input (RXn/

SIn) to Serial Output (TXn/SOn)

0.25

7.0

Differential Output Rise/Fall time

—

300

Between 20% and 80%

Reference Clock Requirements

REFCLK input rise/fall times

—

2.0

Between VIL(MAX) and VIH(MIN)

REFCLK Frequency

105

52.5

108

MHz

106.25 MHz Nom.; REFSEL is HIGH

53.125 MHz Nom.; REFSEL is LOW

Frequency Offset

-200

+200

ppm

Maximum frequency offset between

10 or 20 times REFCLK and the

datarate of the serial input to the CRU.

REFCLK Duty Cycle

Measured at 1.5V

TH , TL

REFCLK Input HIGH/LOW time

2.5

—

From VIH(MIN) to VIH(MIN) or

VIL(MAX) to VIL(MAX)

RXn,

SOn,

TXn

REFCLK

VIH(MIN)

VIL(MAX)

80%

20%

SIn

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