© VITESSE SEMICONDUCTOR CORPORATION

Page 5

8/31/98

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

VITESSE

SEMICONDUCTOR CORPORATION

Advance Product Information

VSC7128

Hex Port Bypass Circuit / Dual Repeater

for 1.0625 Gb/s FC-AL Disk Arrays

G52177-0, Rev. 2.3

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 2: Input Structures

INPUT

INPUT

High Speed Differential Input

GND

+3.3 V

(RX+/RX-)

A

B

REFCLK and TTL Inputs

INPUT

+3.3 V

Current

Limit

GND

R

R

All Resistors

3.3K