VSC7139 Просмотр технического описания (PDF) - Vitesse Semiconductor
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VSC7139 Datasheet PDF : 18 Pages
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VITESSE
SEMICONDUCTOR CORPORATION
Quad Transceiver for
Gigabit Ethernet and Fibre Channel
Preliminary Datasheet
VSC7139
AC Characteristics
Figure 3: Transmit Timing Waveforms
REF
TBCx
Tx(0:9)
10 Bit Data Data Valid
T1
T2
Data Valid
Data Valid
+/-Tx
REF
TBCx
TRLAT
TTLAT
Tx0 Tx1 Tx2
Table 3: Transmitter AC Characteristics
Paramete
r
Description
Min Typ Max Units
Conditions
T1
Tx(0:9) Setup time to the rising
edge of TBCx or REF
Measured between the valid data
1.5
—
—
ns level of Tx(0:9) to the 1.4V point
of TBCx or REF
T2
Tx(0:9) hold time after the rising
edge of TBCx or REF
1.0
—
—
ns
TSDR,TSDF Tx+/Tx- rise and fall time
—
—
300
ps
20% to 80%, 75Ω load to VDD/2,
tested on a sample basis
TRLAT
Latency from rising edge of REF
to Tx0 appearing on TX+/TX-
7bc +
0.66ns
—
7bc +
1.46ns
bc = Bit clocks
ns = nanoseconds
TTLAT
Latency from rising edge of TBCx 5bc +
to Tx0 appearing on TX+/TX-
0.66ns
—
11bc +
1.46ns
ns
bc = Bit clocks
ns = nanoseconds
Transmitter Output Jitter
RJ
Random jitter (RMS)
—
5
8
ps
Measured at SO+/-, 1 sigma
deviation of 50% crossing pointt
DJ
Serial data output deterministic
jitter (pk-pk)
—
35
80
ps
IEEE 802.3Z Clause 38.68, tested
on a sample basis
Page 6
© 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
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