VITESSE

SEMICONDUCTOR CORPORATION

Data Sheet

VSC7140

1.0625 Gb/s Fibre Channel

Dual Repeater / Hub Node

G52180-0, Rev 4.0

Page 7

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

Input Structures

Two input structures exists in this part; TTL and High Speed, Differential Inputs. The TTL Inputs will inter-

face with any TTL or 3.3V or 5V CMOS outputs. The High Speed, Differential Inputs are intended to be AC

Coupled per the FC-PH specification. Being AC Coupled, the High Speed, Differential Input buffers are biased

Figure 4: Input Structures

INPUT

INPUT

High Speed Differential Input

GND

+3.3 V

(RXn+/-, SIn+/-)

A

B

REFCLK and TTL Inputs

INPUT

+3.3 V

Current

Limit

GND

All Resistors

3.3K