VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
VSC7127/VSC7129
Family of Repeater/Retimer and Port
Bypass Circuits for Fibre Channel
AC Characteristics
(Over Recommended Operating Conditions)
Figure 3: Timing Waveforms
Ix+/-
Ox+/-
T
1
T
1
Table 1: AC Characteristics
(Over recommended operating conditions)
Parameters
T
1
T
1
T
R
, T
F
T
j(PBC)
T
J(RPTR)
Description
Propagation delay (Repeater mode)
Propagation delay (Retimer mode)
Serial data rise and fall time
Data jitter accumulation
(PBC only)
Total data output jitter
(Repeater mode)
Serial data output deterministic jitter
(p-p) (Repeater mode)
Total data output jitter
(Retimer Mode)
(1)
Serial data output deterministic jitter
(p-p) (Retimer Mode)
(1)
Jitter tolerance
Min
Typ
Max
7.0
180
300
120
192
Units
ns
ns
ps
ps
ps
Conditions
Delay with all circuits bypassed.
Delay with all circuits bypassed.
Typical delay is 100 bit times.
At
∆
V
IN
minimum levels
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
Jitter generation at Ox+/- when
driven by the CRU in Repeater
Mode. IEEE 802.3z Clause 38.68
Jitter generation at Ox+/- when
driven by the CRU in Retimer
Mode.
Jitter generation at Ox+/- when
driven by the CRU in Retimer
Mode.
Minimum eye opening for proper
operation as defined in MJS 8.0.
T
DJ(RPTR)
80
ps
T
J(RTMR)
192
ps
T
DJ(RTMR)
T
JTOL
80
0.24
ps
UI
NOTE: (1) Retimer mode is only available for Fibre Channel applications.
G52298-0, Rev 4.3
05/01/01
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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
Page 5
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