Pericom PI3USB102 User manual

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PI3USB102
PI3USB102 Demo Board Rev.A User Manual
Introduction
This user manual describes the components and operation of the PI3USB102 Demo Board. USB2.0 high-speed, full-
speed and low speed signal quality measurement setup will also be described in the user guide and result for this
demo board using High Speed USB device. TDR measurement result will also be shown in this user guide.
Figure 1. Top view of PI3USB102

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Board Operation
The PI3USB102 is a single differential channel 2:1 multiplexer or demultiplexer. Figure 2 shows the logical block
diagram of PI3USB102.
Figure 2. Logical Block Diagram of PI3USB102
In order to choose which output the Y+/Y- connects to, two header pins are provided on the demo board for user to
choose the desired signal path. Table 1 shows the truth table of the device.
SEL
nOE
Y+
Y-
X
H
Hi-Z
Hi-Z
L
L
M+
M-
H
L
D+
D-
Table 1. Truth Table of PI3USB102

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If nOE is connected to “L” and SEL is connected to “L”, Y+/Y- will connect to M+/M-. Figure 3 shows the signal path of
this connection.
SEL
nOE
Y+
Y-
X
H
Hi-Z
Hi-Z
L
L
M+
M-
H
L
D+
D-
Figure 3. Signal path of connection to M+/M-

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If nOE is connected to “L” and SEL is connected to “H”, Y+/Y- will connect to M+/M-. Figure 4 shows the signal path of
this connection.
Figure 4. Signal path of connection to D+/D-
SEL
nOE
Y+
Y-
X
H
Hi-Z
Hi-Z
L
L
M+
M-
H
L
D+
D-

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Signal Quality Measurement
Tektronix TDS7404 is used to measure Signal Quality of PI3USB102. The USB signal from High-Speed USB device
through PI3USB102 is compared with USB 2.0 High Speed UPSTREAM –NEAR END eye mask. Figure 5 shows the
test setup of USB 2.0 High Speed test.
Figure 5. USB 2.0 High Speed Test Setup

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Figure 6a and Figure 6b show the PASSING eye-diagram of which the USB 2.0 High Speed signal passing through
PI3USB102. Figure 6c shows the eye-diagram of which the PI3USB102 is not used.
Figure 6a. High Speed Eye-Diagram of connection to M+/M-
Measurement Name
Minimum
Maximum
Mean
pk-pk
Standard Deviation
RMS
Population
Status
Monotonic Property
-
-
-
-
-
-
0
Pass
Eye Diagram Test
-
-
-
-
-
-
-
Pass
Signal Rate
470.1142Mbps
494.4532Mbps
480.0265Mbps
0.0000bps
4.089580Mbps
480.7090Mbps
513
Pass
EOP Width
-
-
16.66155ns
-
-
-
1
Pass
EOP Width (Bits)
-
-
7.997988
-
-
-
1
Pass
Rise Time
739.5680ps
896.1289ps
807.2906ps
156.5609ps
34.96188ps
808.0402ps
107
Pass
Fall Time
735.7871ps
861.8438ps
797.0221ps
126.0568ps
31.65904ps
797.6448ps
107
Pass
Table 2. High Speed Signal Quality Measurement of connection to M+/M-

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Figure 6b. High Speed Eye-Diagram of connection to D+/D-
Measurement Name
Minimum
Maximum
Mean
pk-pk
Standard Deviation
RMS
Population
Status
Monotonic Property
-
-
-
-
-
-
0
Pass
Eye Diagram Test
-
-
-
-
-
-
-
Pass
Signal Rate
473.5376Mbps
492.7479Mbps
480.0623Mbps
0.0000bps
3.670153Mbps
480.6329Mbps
513
Pass
EOP Width
-
-
16.70019ns
-
-
-
1
Pass
EOP Width (Bits)
-
-
8.017130
-
-
-
1
Pass
Rise Time
696.8445ps
840.6004ps
770.7400ps
143.7559ps
25.85369ps
771.1695ps
107
Pass
Fall Time
707.7780ps
843.9054ps
772.5156ps
136.1273ps
28.84574ps
773.0489ps
107
Pass
Table 3. High Speed Signal Quality Measurement of connection to D+/D-

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Figure 6c. High Speed Signal Quality Measurement without PI3USB102
Measurement Name
Minimum
Maximum
Mean
pk-pk
Standard Deviation
RMS
Population
Status
Monotonic Property
-
-
-
-
-
-
0
Pass
Eye Diagram Test
-
-
-
-
-
-
-
Pass
Signal Rate
473.1907Mbps
489.3789Mbps
480.0545Mbps
0.0000bps
2.961996Mbps
480.4405Mbps
513
Pass
EOP Width
-
-
16.70521ns
-
-
-
1
Pass
EOP Width (Bits)
-
-
8.019411
-
-
-
1
Pass
Rise Time
566.0808ps
658.6335ps
605.0194ps
92.55269ps
19.01294ps
605.3152ps
107
Pass
Fall Time
478.2657ps
671.5919ps
565.0937ps
193.3262ps
38.96274ps
566.4229ps
107
Pass
Table 4. High Speed Signal Quality Measurement without PI3USB102

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The USB signal from Full-Speed USB device through PI3USB102 is compared with USB 2.0 Full Speed
DOWNSTREAM –FAR END eye mask. Figure 7 shows the test setup of USB 2.0 Full Speed and Low Speed test
setup.
Figure 5. USB 2.0 Full Speed and Low Speed Test Setup

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Figure 8a and Figure 8b show the PASSING eye-diagram of which the USB 2.0 Full Speed signal passing through
PI3USB102.
Figure 8a. Full Speed Eye-Diagram of connection to M+/M-
Measurement Name
Minimum
Maximum
Mean
pk-pk
Standard Deviation
RMS
Population
Status
Eye Diagram Test
-
-
-
-
-
-
-
Pass
Signal Rate
11.82033Mbps
12.19512Mbps
11.99872Mbps
0.0000bps
117.2124kbps
12.00201Mbps
30
Pass
Crossover Voltage
1.700000 V
1.960000 V
1.821494 V
260.0000mV
64.66396mV
1.822574 V
17
Pass
EOP Width
-
-
165.8083ns
-
-
-
1
Pass
Consecutive Jitter
-692.1122ps
863.4434ps
0.0000s
1.555556ns
524.1401ps
507.4965ps
16
Pass
Paired JK Jitter
-400.0000ps
276.8254ps
-2.539683ps
676.8254ps
211.5925ps
195.9130ps
7
Pass
Paired KJ Jitter
-204.4444ps
417.7778ps
30.36075ps
622.2222ps
217.9307ps
204.0361ps
7
Pass
Table 5. Full Speed Signal Quality Measurement of connection to M+/M-
Additional Information :
Rise Time: Min: 12.739ns Max: 15.468ns Mean: 13.801ns Std: 781.27ps RMS: 13.820ns Population: 8
Fall Time: Min: 13.362ns Max: 14.530ns Mean: 13.840ns Std: 426.35ps RMS: 13.846ns Population: 8

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Figure 8b. Full Speed Eye-Diagram of connection to D+/D-
Measurement Name
Minimum
Maximum
Mean
pk-pk
Standard Deviation
RMS
Population
Status
Eye Diagram Test
-
-
-
-
-
-
-
Pass
Signal Rate
11.81723Mbps
12.16887Mbps
12.00424Mbps
0.0000bps
124.9426kbps
11.99716Mbps
29
Pass
Crossover Voltage
1.752727 V
1.963636 V
1.848974 V
210.9091mV
57.64284mV
1.849827 V
20
Pass
EOP Width
-
-
165.7698ns
-
-
-
1
Pass
Consecutive Jitter
-978.1878ps
1.082909ns
0.0000s
2.061096ns
618.8819ps
602.3755ps
19
Pass
Paired JK Jitter
-320.5691ps
276.1086ps
-68.33082ps
596.6777ps
181.1687ps
183.9682ps
9
Pass
Paired KJ Jitter
-380.6688ps
207.7325ps
-99.02908ps
588.4013ps
187.7591ps
201.6272ps
8
Pass
Table 6. Full Speed Signal Quality Measurement of connection to D+/D-
Additional Information :
Rise Time: Min: 12.582ns Max: 13.672ns Mean: 13.161ns Std: 377.84ps RMS: 13.165ns Population: 9
Fall Time: Min: 12.117ns Max: 14.446ns Mean: 13.423ns Std: 680.41ps RMS: 13.438ns Population: 10

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The USB signal from Low-Speed USB device through PI3USB102 is compared with USB 2.0 Low Speed
DOWNSTREAM –NEAR END eye mask. Figure 9a and Figure 9b show the PASSING eye-diagram of which the USB
2.0 Full Speed signal passing through PI3USB102.
Figure 9a. Low Speed Eye-Diagram of connection to M+/M-
Measurement Name
Minimum
Maximum
Mean
pk-pk
Standard Deviation
RMS
Population
Status
Eye Diagram Test
-
-
-
-
-
-
-
Pass
Signal Rate
1.493664Mbps
1.509021Mbps
1.499836Mbps
0.0000bps
4.024761kbps
1.500093Mbps
31
Pass
Crossover Voltage
1.706667 V
1.856364 V
1.796314 V
149.6970mV
34.28785mV
1.796626 V
22
Pass
EOP Width
-
-
1.339729us
-
-
-
1
Pass
Consecutive Jitter
-2.837954ns
3.262011ns
0.0000s
6.099965ns
1.466047ns
1.430715ns
21
Pass
Paired JK Jitter
-1.321092ns
2.050337ns
275.5051ps
3.371429ns
1.160625ns
1.135010ns
10
Pass
Paired KJ Jitter
-4.145274ns
2.336051ns
152.1313ps
6.481325ns
2.299580ns
2.173396ns
9
Pass
Table 7. Low Speed Signal Quality Measurement of connection to M+/M-

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Figure 9b. Low Speed Eye-Diagram of connection to D+/D-
Measurement Name
Minimum
Maximum
Mean
pk-pk
Standard Deviation
RMS
Population
Status
Eye Diagram Test
-
-
-
-
-
-
-
Pass
Signal Rate
1.485653Mbps
1.513186Mbps
1.499986Mbps
0.0000bps
6.258799kbps
1.500167Mbps
31
Pass
Crossover Voltage
1.709333 V
1.846154 V
1.795022 V
136.8205mV
40.85973mV
1.795465 V
22
Pass
EOP Width
-
-
1.339144us
-
-
-
1
Pass
Consecutive Jitter
-2.944317ns
3.638171ns
0.0000s
6.582488ns
1.831335ns
1.787200ns
21
Pass
Paired JK Jitter
-3.493088ns
4.884084ns
132.7189ps
8.377171ns
2.885336ns
2.740486ns
10
Pass
Paired KJ Jitter
-4.197235ns
4.061412ns
-92.67793ps
8.258647ns
2.620899ns
2.472745ns
9
Pass
Table 8. Low Speed Signal Quality Measurement of connection to D+/D-

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TDR Measurement
Differential impedance of PI3USB102 on a demo board is measured to confirm the trace impedance is within the
requirement described in USB 2.0 TDR Loading specification in Section 7.1.6.2.
Section
Reference
Requirement
7.1.6.2
TDR Loading Specification
Through Impedance: 70Ω≤ZHSTRHU≤110Ω *
At Termination Impedance: 80Ω≤ZHSTERM≤100Ω
* In the Exception Window (a sliding 1.4 ns window inside the
Through Impedance time window), the differential
impedance may exceed the Through limits. No single excursion,
however, may exceed the Through limits for
more than twice the TDR rise time (400 ps)
Filter Rise Time = 380ps
Through Impedance
D+/D-
Spec
Units
Min
Max
J3
Min
75.14
70
110

Max
101.4
70
110

J4
Min
75.14
70
110

Max
101.4
70
110

Table 9. TDR Through Impedance Result of PI3USB102

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Figure 10a. TDR at D+/D- of J3
Figure 10b. TDR at D+/D- of J4

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Appendix A: PCB Schematic

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Appendix B: PCB Layout Requirements
a. Stack Up:
b. Isolation Spacing = 30 mil
c. Width & Spacing (W/S) of 90Ω Differential Trace = 11 / 10 mil

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Appendix C: BOM List
Reference
Description
Package
Value
Qty
U2
3.3V Regulator
SOT89
1
J1
2x3pin connector, 2.54mm
1
J5-6
3pin 2.54mm Pin Header
2
C4
Ceramic Capacitor
0402
0.1uF
1
C5
Ceramic Capacitor
0402
10nF
1
C2-3
Ceramic Capacitor
0805
1uF
2
C6
Ceramic Capacitor
0805
4.7uF
1
C1
Tan Cap
B-Size
22uF
1
U1
USB2.0 High-Speed(480Mbps) Signal
Switch
TQFN10
1
R2
Resistor
0402
0R
1
R1
Resistor
0402
NC
1
J3-4
USB Type-A Receptacle
2
J2
USB Type-B Receptacle
1

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History
Version 1.0 Original Version December 12, 2007
Version 1.1 Eye Diagram is added December 20, 2007