Data Sheet

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7
FSUSB42 — Low-Power, Two-Port, High-Speed, USB2.0 (480Mbps) UART Switch
Test Diagrams (Continued)
V
cc
0.9*V
out
V
cc
/2
t
BBM
0V
V
OUT
Input - V
Sel
0.9*V
out
t
RISE
= 2.5ns
90%
10%
C
L
HSD
n
R
L
Dn
GND
GND
R
S
V
Sel
V
SW1
GND
V
OUT
V
SW2
GND
--
R
L
, R
S
, and C
L
are functions of the application
environment (see AC Tables for specific values)
C
L
includes test fixture and stray capacitance.
Figure 10. Break-Before-Make Interval Timing
V
OUT
GND
GND
R
T
GND
GND
V
S
R
S
Network Analyzer
V
Sel
GND
R
S
and R
T
are functions of the application
environment (see AC Tables for specific values).
V
IN
R
S
and R
T
are functions of the application
environment (see AC Tables for specific values).
V
OUT
GND
GND
R
T
GND
GND
V
S
R
S
Network Analyzer
R
T
GND
V
Sel
GND
V
IN
R
T
Off isolation = 20 Log (V
OUT
/ V
IN
)
Figure 11. Bandwidth
Figure 12. Channel Off Isolation
V
OUT
GND
GND
R
T
GND
GND
V
S
R
S
Network Analyzer
R
T
GND
R
S
and R
T
are functions of the application environment
(see AC Tables for specific values).
V
Sel
GND
NC
V
IN
Crosstalk = 20 Log (V
OUT
/ V
IN
)
Figure 13. Non-Adjacent Channel-to-Channel Crosstalk
Capacitance
Meter
HSDn
Dn
S=LOW or HIGH
OE=HIGH
Capacitance
Meter
HSDn
Dn
S=LOW or HIGH
OE=LOW
Figure 14. Channel Off Capacitance
Figure 15. Channel On Capacitance