VITESSE
SEMICONDUCTOR CORPORATION
Quad Transceiver for
Gigabit Ethernet and Fibre Channel
Preliminary Datasheet
VSC7139
REF
TBCx
Figure 5: REF and TBCx Waveforms
TL
TH
VIH(MIN)
VIL(MAX)
RFCO0
RFCO1
TP
Table 5: Reference Clock Requirements
Parameters
Description
FR
Frequency Range
FO
Frequency Offset
TP
DC
TR/TF
DC
TRCR,TRCF
Delay from REF to RFCO0/1
RFC0/1 Duty Cycle
RFC0/1 rise and fall time
REF/TBCx duty cycle
REF/TBCx rise and fall time
Min Typ Max Units
Conditions
Range over which both transmit
105 — 136 MHz and receive reference clocks on
any link may be centered
Maximum frequency offset
-200 — 200 ppm between transmit and receive
reference clocks on one link
1.97 — 3.58 ns
40
—
60
%
0.25 —
1.5
ns
Between VIL(max) and VIH(min)
35
—
65
% Measured at 1.4V
—
—
1.5
ns
Between VIL(max) and VIH(min)
Page 8
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
G52196-0, Rev 3.3
5/14/01