VITESSE
SEMICONDUCTOR CORPORATION
Quad Transceiver for
Gigabit Ethernet and Fibre Channel
Figure 5: REF and TBCx Waveforms
Preliminary Datasheet
VSC7139
T
H
V
IH(MIN)
V
IL(MAX)
T
L
REF
TBCx
RFCO0
RFCO1
T
P
Table 5: Reference Clock Requirements
Parameters
FR
Description
Frequency Range
Min
105
Typ
—
Max
136
Units
MHz
Conditions
Range over which both transmit
and receive reference clocks on
any link may be centered
Maximum frequency offset
between transmit and receive
reference clocks on one link
FO
T
P
DC
T
R
/T
F
DC
T
RCR
,T
RCF
Frequency Offset
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
-200
1.97
40
0.25
35
—
—
—
—
—
—
—
200
3.58
60
1.5
65
1.5
ppm
ns
%
ns
%
ns
Between V
IL(max)
and V
IH(min)
Measured at 1.4V
Between V
IL(max)
and V
IH(min)
Page 8
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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
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
