ISL54224 Datasheet, PDF (8/18 Pages) Intersil Corporation – High-Speed USB 2.0 (480Mbps) Multiplexer with Overvoltage Protection (OVP) and Overvoltage Indicator Output

ISL54224
Test Circuits and Waveforms (Continued)
VDD
C
VDD
C
IMPEDANCE
ANALYZER
OE/ALM
HSDxx
Dx
GND
SEL
0V OR
VDD
Repeat test for all switches.
FIGURE 4. CAPACITANCE TEST CIRCUIT
SIGNAL
GENERATOR
OE/ALM
HSD1x
Dx
50Ω
SEL
VIN
ANALYZER
Dx
HSD2x
NC
GND
R_L
Signal direction through switch is reversed.
Repeat test for all switches.
FIGURE 5. CROSSTALK TEST CIRCUIT
VDD
C
DIN+
DIN-
OUT+
OUT-
t_ri
10%
90%
50%
90%
t_{skew_i}
50%
10%
t_fi
t_ro
90%
10%
90%
50%
50%
t_{skew_o}
10%
t_f0
VIN
DIN+
DIN-
15.8Ω
143Ω
15.8Ω
143Ω
OE/ALM
SEL
COMD2
COMD1
D2
OUT+
C_L
45Ω
D1
OUT-
C_L
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
FN6969.0
June 7, 2010