Data Sheet

© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSUSB31 — Low-Power, Single-Port, High-Speed USB 2.0 (480Mbps) Switch
FSUSB31 Rev. 1.1.0 8
Test Diagrams (Continued)
Figure 14. Break-Before-Make (t
BBM
)
Figure 15. Switch Skew Tests
Figure 16. Bandwidth
t
D
t
R
= t
F
= 2.5ns (10–90%)
R
L
S
C
L
*
HSDn
HSDn
V
O
Control
Input
D+, D–
GND
Control
Input
50%
V
CC
0V
V
OUT
V
OUT
V
CC
V
CC
0.9 x V
OUT
*C
L
includes test fixture and stray capacitance.
t
RISE
= 500ps
t
PLH
t
PHL
Input:
Output: D+, D–
HSDn+
HSDn–
t
FALL
= 500ps
V
OH
90% 90%
50%
50%
10%
10%
50%
50%
V
OL
400mV
T
SK(P)
= | t
PHL
– t
PLH
|
Pulse Skew, T
SK(P)
0V
t
RISE
= 500ps
t
PLH1
t
PHL1
Output1:
Input: D+, D–
Output1: D2+, D2–
HSD1+
HSD1–
t
FALL
= 500ps
V
OH
90% 90%
50%
50%
10%
10%
50%50%
V
OL
400mV
T
SK(O)
= | t
PLH1
– t
PLH2
| or | t
PHL1
– t
PHL2
|
Output Skew, T
SK(OUT)
0V
t
PLH2
t
PHL2
V
OH
50%50%
V
OL
R
S
V
IN
FSUSB31
GND
V
OE
Network Analyzer
V
OUT
GND
V
S
GND
R
T
GND
GND
R
S
and R
T
are functions of the application environment
(see AC Electrical Tables for specific values).