VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
Family of Repeater/Retimer and Port
Bypass Circuits for Fibre Channel
VSC7127/VSC7129
AC Characteristics (Over Recommended Operating Conditions)
Figure 3: Timing Waveforms
Ix+/-
Ox+/-
T1
T1
Table 1: AC Characteristics (Over recommended operating conditions)
Parameters
Description
Min
Typ
Max Units
Conditions
T1
Propagation delay (Repeater mode)
7.0
180
300
120
ns
ns
ps
ps
Delay with all circuits bypassed.
Delay with all circuits bypassed.
Typical delay is 100 bit times.
T1
Propagation delay (Retimer mode)
Serial data rise and fall time
TR, TF
Tj(PBC)
At ∆VIN minimum levels
Data jitter accumulation
(PBC only)
Peak-to-peak on Ox+/- in Port
Bypass Circuit Mode.
Jitter generation at Ox+/- when
driven by the CRU in Repeater
Mode. IEEE 802.3z Clause 38.68
Total data output jitter
(Repeater mode)
TJ(RPTR)
TDJ(RPTR)
TJ(RTMR)
192
80
ps
ps
ps
Jitter generation at Ox+/- when
driven by the CRU in Repeater
Mode. IEEE 802.3z Clause 38.68
Serial data output deterministic jitter
(p-p) (Repeater mode)
Jitter generation at Ox+/- when
driven by the CRU in Retimer
Mode.
Total data output jitter
(Retimer Mode)(1)
192
80
Jitter generation at Ox+/- when
driven by the CRU in Retimer
Mode.
Serial data output deterministic jitter
(p-p) (Retimer Mode)(1)
TDJ(RTMR)
ps
Minimum eye opening for proper
operation as defined in MJS 8.0.
TJTOL
Jitter tolerance
0.24
UI
NOTE: (1) Retimer mode is only available for Fibre Channel applications.
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
G52298-0, Rev 4.3
05/01/01
Page 5
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