VELOCITYTM
VITESSE
SEMICONDUCTOR CORPORATION
10-Bit Transceiver for Fibre
Channel and Gigabit Ethernet
VDDD
INPUT
Figure 8: Input Structures
INPUT
VDDD
3K
4K
Data Sheet
VSC7123
GND
TTL Inputs (not REFCLK)
VDD +3.3 V
INPUT
3K
4K
GND
High-Speed Input (RX+/RX-)
REFCLK
12.6K
9.3K
12.6K
9.3K
GND
REFCLK TTL Input
VDDT
OUTPUT
VSST
VSSD
TTL Outputs
VDDP
VDDD
TX+
TX-
GND
High-Speed Outputs (TX+/-)
Page 10
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
G52212-0, Rev 4.3
03/25/01