VSC7140 Datasheet, PDF (5/12 Pages) Vitesse Semiconductor Corporation – 1.0625 Gb/s Fibre Channel Dual Repeater / Hub Node

Data Sheet
VSC7140
VITESSE
SEMICONDUCTOR CORPORATION
1.0625 Gb/s Fibre Channel
Dual Repeater / Hub Node
AC Characteristics
Figure 3: AC Timing Diagrams
RXn,
SIn
SOn,
TXn
T_P
T_P
80%
20%
T_S
T_S
REFCLK
T_T
T_H
T_L
T_T
T
V_IH(MIN)
V_IL(MAX)
Table 1: AC Characteristics (Over recommended operating conditions).
Parameters
T_P
T_S
T_T
F
Description
Differential Inputs/Outputs
Latency from Serial Input (RXn/
SIn) to Serial Output (TXn/SOn)
Differential Output Rise/Fall time
Reference Clock Requirements
REFCLK input rise/fall times
REFCLK Frequency
F_O
DC
T_H , T_L
Frequency Offset
REFCLK Duty Cycle
REFCLK Input HIGH/LOW time
Min. Max. Units
Conditions
0.25 7.0
—
300
ns
ps Between 20% and 80%
—
2.0
ns Between V_IL(MAX) and V_IH(MIN)
105
52.5
108
54
MHz
106.25 MHz Nom.; REFSEL is HIGH
53.125 MHz Nom.; REFSEL is LOW
Maximum frequency offset between
-200 +200 ppm 10 or 20 times REFCLK and the
datarate of the serial input to the CRU.
35
65
% Measured at 1.5V
2.5
—
ns
From V_IH(MIN) to V_IH(MIN) or
V_IL(MAX) to V_IL(MAX)
G52180-0, Rev 4.0
10/23/00
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Tel: (800) VITESSE • FAX: [phone] • Email: [e-mail]
Internet: www.vitesse.com
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