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, full­speed 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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SEL

nOE

Y+

Y- X H

Hi-Z

Hi-Z L L

M+

M-

H L D+

D-

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.

Table 1. Truth Table of PI3USB102

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SEL

nOE

Y+

Y- X H

Hi-Z

Hi-Z L L

M+

M- H L

D+

D-

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.

Figure 3. Signal path of connection to M+/M-

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SEL

nOE

Y+

Y- X H

Hi-Z

Hi-Z L L

M+

M- H L

D+

D-

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-

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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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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

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-

Table 2. High Speed Signal Quality Measurement of connection to M+/M-

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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

Figure 6b. High Speed Eye-Diagram of connection to D+/D-

Table 3. High Speed Signal Quality Measurement of connection to D+/D-

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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

Figure 6c. High Speed Signal Quality Measurement without PI3USB102

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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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

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-

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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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

Figure 8b. Full Speed Eye-Diagram of connection to D+/D-

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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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

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-

Table 7. Low Speed Signal Quality Measurement of connection to M+/M-

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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

Figure 9b. Low Speed Eye-Diagram of connection to D+/D-

Table 8. Low Speed Signal Quality Measurement of connection to D+/D-

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Section

Reference

Requirement

7.1.6.2

TDR Loading Specification

Through Impedance: 70Ω≤Z

HSTRHU

≤110Ω *

At Termination Impedance: 80Ω≤Z

HSTERM

≤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)

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



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.

Filter Rise Time = 380ps

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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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

Appendix C: BOM List

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History

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

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