ISL76120 Datasheet, PDF (7/13 Pages) Intersil Corporation – Automotive Grade USB 2.0 High/Full Speed Multiplexer

ISL76120
Test Circuits and Waveforms (Continued)
V_DD
C
V_DD
C
EN
HSx or FSx
SIGNAL
GENERATOR
EN
HSx
COMx
45Ω
IMPEDANCE
ANALYZER
IN
IN
VIN_L OR
VIN
COMx
VIN_H
GND
ANALYZER
COMx
FSx
NC
GND
R_L
Repeat test for all switches.
Signal direction through switch is reversed, worst case values
are recorded. Repeat test for all switches.
FIGURE 5. CAPACITANCE TEST CIRCUIT
FIGURE 6. CROSSTALK TEST CIRCUIT
t_ri
DIN+
DIN-
OUT+
OUT-
10%
90%
50%
t_{skew_i}
90%
50%
10%
t_fi
t_ro
90%
10%
90%
50%
t_{skew_o}
50%
t_f0
10%
V_{DD C}
VIN
DIN+
DIN-
15.8Ω
143Ω
15.8Ω
143Ω
EN
VIN
COMD2
COMD1
D2
C_L
D1
C_L
|t_ro-t_ri| Change Due to Switch for Rising Input and Rising Output
Signals.
|t_fo-t_fi| Change Due to Switch for Falling Input and Falling Output
Signals.
|t_{skew_0}| Skew through the Switch for Output Signals.
|t_{skew_i}| Skew through the Switch for Input Signals.
FIGURE 7A. MEASUREMENT POINTS
FIGURE 7. SKEW TEST
GND
FIGURE 7B. TEST CIRCUIT
OUT+
45Ω
OUT-
45Ω
7
FN6711.1
May 29, 2008