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ISL54225_10 Datasheet, PDF (8/18 Pages) Intersil Corporation – High-Speed USB 2.0 (480Mbps) Multiplexer with Overvoltage Protection (OVP)
ISL54225
Test Circuits and Waveforms (Continued)
VDD
C
VDD
C
HSDxx
SIGNAL
GENERATOR
HSD1x
Dx
50Ω
IMPEDANCE
ANALYZER
Dx
GND
SEL
0V OR
VDD
OE
Repeat test for all switches.
FIGURE 4. CAPACITANCE TEST CIRCUIT
SEL
VIN
ANALYZER
Dx
HSD2x
NC
GND
OE
RL
Signal direction through switch is reversed, worst case values
are recorded. Repeat test for all switches.
FIGURE 5. CROSSTALK TEST CIRCUIT
VDD
C
DIN+
DIN-
OUT+
OUT-
tri
10%
90%
50%
tskew_i
90% 50%
10%
tfi
tro
90%
10%
90%
50%
tskew_o
50%
tf0
10%
VIN
DIN+
DIN-
15.8Ω
143Ω
15.8Ω
143Ω
SEL
COMD2
COMD1
D2
D1
OE
OUT+
CL
45Ω
OUT-
CL
45Ω
GND
|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.
|tskew_i| Change in Skew through the Switch for Input Signals.
FIGURE 6A. MEASUREMENT POINTS
FIGURE 6. SKEW TEST
FIGURE 6B. TEST CIRCUIT
8
FN7627.0
July 2, 2010