VSC7140 Datasheet, PDF (7/12 Pages) Vitesse Semiconductor Corporation – 1.0625 Gb/s Fibre Channel Dual Repeater / Hub Node

Data Sheet
VSC7140
VITESSE
SEMICONDUCTOR CORPORATION
1.0625 Gb/s Fibre Channel
Dual Repeater / Hub Node
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
at V_DD/2. Refer to Figure 4, Input structures.
Figure 4: Input Structures
V_DD +3.3 V
INPUT
Current
Limit
GND
REFCLK and TTL Inputs
A
V_{DD +3.3 V}
INPUT
INPUT
All Resistors
3.3K
GND
High Speed Differential Input
(RXn+/-, SIn+/-)
B
G52180-0, Rev 4.0
10/23/00
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