VITESSE
2.488 Gb/s ATM/SDH/SONET STM-16/STS-48
Mux/Demux and Section Terminator IC Chipset
SEMICONDUCTOR CORPORATION
Datasheet
VSC8025/VSC8026
Figure 22: HSECL Input Termination
IN+
GND
5kΩ
5kΩ
VTT
50Ω
50Ω
REF
IN-
GND
(A). If the high speed inputs are AC coupled, the REF pin needs to be connected to GND
with a decoupling capacitor.
IN+
GND
5kΩ
5kΩ
VTT
50Ω
50Ω
REF
IN-
VTT
(B). If the high speed inputs are DC coupled, the REF pin needs to be connected to VTT directly.
Page 40
VITESSE SEMICONDUCTOR CORPORATION
G52182-0, Rev. 4.0
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
1/5/00