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| ISL54227_10 Datasheet, PDF (7/18 Pages) Intersil Corporation – High-Speed USB 2.0 (480Mbps) DPST Switch with Overvoltage Protection (OVP) and Dedicated Charger Port Detection | |||
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ISL54227
Test Circuits and Waveforms
VDD
LOGIC
INPUT
0V
SWITCH
INPUT
VINPUT
SWITCH
OUTPUT 0V
50%
tOFF
VOUT
90%
tON
tr < 20ns
tf < 20ns
90%
VDD
C
VINPUT
SWITCH
INPUT
COMx
OE
VIN
GND
Dx
VOUT
RL
CL
50Ω 50pF
Logic input waveform is inverted for switches that have the
opposite logic sense.
Repeat test for all switches. CL includes fixture and stray
capacitance.
VOUT
=
V (INPUT)
---------R-----L---------
RL + rON
FIGURE 1A. MEASUREMENT POINTS
FIGURE 1B. TEST CIRCUIT
FIGURE 1. SWITCHING TIMES
VDD
C
rON = V1/17mA
VHSDX
COMx
17mA
V1
Dx
GND
OE VDD
Repeat test for all switches.
FIGURE 2. rON TEST CIRCUIT
VDD
C
VDD
C
IMPEDANCE
ANALYZER
COMx
Dx
GND
OE
0V OR
VDD
Repeat test for all switches.
FIGURE 3. CAPACITANCE TEST CIRCUIT
7
SIGNAL
GENERATOR
COM+
D+
50Ω
OE
VIN
ANALYZER
D-
COM-
NC
GND
RL
Signal direction through switch is reversed, worst case values
are recorded. Repeat test for all switches.
FIGURE 4. CROSSTALK TEST CIRCUIT
FN7593.0
July 2, 2010
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