isl54220 Intersil Corporation, isl54220 Datasheet - Page 6

• Manufacturer Part Number: isl54220
• Description: High-speed Usb 2.0 480mbps Multiplexer
• Manufacturer: Intersil Corporation

Test Circuits and Waveforms
Repeat test for all switches.
IMPEDANCE
ANALYZER
OUT+
DIN+
DIN-
OUT-
FIGURE 4. CAPACITANCE TEST CIRCUIT
FIGURE 6A. MEASUREMENT POINTS
90%
10%
90%
10%
t
t
t
fi
ri
f0
t
50%
50%
ro
HSDxx
Dx
50%
6
50%
90%
10%
t
10%
90%
skew_i
t
skew_o
GND
(Continued)
V
DD
OE
SEL
C
0V OR
VDD
FIGURE 6. SKEW TEST
ISL54220
|tro - tri| Delay Due to Switch for Rising Input and Rising Output Signals.
|tfo - tfi| Delay Due to Switch for Falling Input and Falling Output Signals
|tskew_0| Change in Skew through the Switch for Output Signals.
Signal direction through switch is reversed, worst case values
are recorded. Repeat test for all switches.
|tskew_i| Change in Skew through the Switch for Input Signals.
SIGNAL
GENERATOR
DIN+
ANALYZER
DIN-
VIN
15.8Ω
15.8Ω
FIGURE 5. CROSSTALK TEST CIRCUIT
143Ω
143Ω
R
VIN
L
FIGURE 6B. TEST CIRCUIT
SEL
COMD2
COMD1
V
HSD1x
SEL
Dx
GND
DD
C
GND
OE
V
HSD2x
DD
D2
D1
OE
Dx
C
December 16, 2008
C
C
L
L
50Ω
OUT+
45Ω
OUT-
45Ω
FN6819.0
NC