PI2PCIE2412 - Pericom Semiconductor

1PS8866C 03/11/09

Features

• 4 Differential Channel, 2:1 Mux/DeMux

• PCI Express, Gen 2 Performance, 5.0Gbps

• Low Bit-to-Bit Skew , 7ps max (between '+' and '-' bits)

• Low Crosstalk: -23dB@3 GHz

• Low Off Isolation: -23dB@3 GHz

• VDD Operating Range: +1.5V to +2.0V

• ESD Tolerance: 5kV HBM I/O; 2kV HBM select pin

• Low channel-to-channel skew, 35ps max

• Packaging (Pb-free & Green):

– 42-contact, TQFN (ZH42)

Description

Pericom Semiconductor’s PI2PCIE2412 is an 8 to 4 differential

channel multiplexer/demultiplexer switch. This solution can

switch 2 full PCI Express, Gen2, lanes to one of two locations.

Using a unique design technique, Pericom has been able to

minimize the impedance of the switch such that the attenuation

observed through the switch is negligible. The unique design

technique also offers a layout targeted for PCI Express signals,

which minimizes the channel to channel skew as well as channel

to channel crosstalk as required by the PCI Express speciﬁ cation.

Application

Routing of PCI-Express, Gen2, signals with low signal attenua-

tion.

Block Diagram Pin Description

PI2PCIE2412

1.8V, PCI Express Gen2 Compliant,

4-Differential Channel, 2:1 Mux/DeMux Switch,

w/ Single Enable

Truth Table

Function SEL

AN to BNL

AN to CNH

A1-

A1+

A0-

A0+

A3-

A3+

A2-

A2+

B0+

B0-

B1+

B1-

C0+

C0-

C1+

C1-

B2+

B2-

B3+

B3-

C2+

C2-

C3+

C3-

SEL

42 41 40 39

18 19 20 21

VDDDNG

B0+

B0-

B1+

B1-

C0+

C0-

C1+

C1-

B2+

B2-

B3+

B3-

C2+

C2-

C3+

C3-

GND

A0+

A0-

GND

A1+

A1-

SEL

GND

A2+

A2-

GND

A3+

A3-

GND

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2PS8866C 03/11/09

PI2PCIE2412

1.8V, PCI Express Gen2 Compliant,

4-Differential Channel, 2:1 Mux/DeMux Switch

Pin Description

Pin # Pin Name I/O Description

A0+

A0– I/O Signal I/O, Channel 0, Port A

A1+

A1– I/O Signal I/O, Channel 1, Port A

A2+

A2– I/O Signal I/O, Channel 2, Port A

A3+

A3– I/O Signal I/O, Channel 3, Port A

B0+

B0−I/O Signal I/O, Channel 0, Port B

B1+

B1−I/O Signal I/O, Channel 1, Port B

B2+

B2−I/O Signal I/O, Channel 2, Port B

B3+

B3−I/O Signal I/O, Channel 3, Port B

C0+

C0– I/O Signal I/O, Channel 0, Port C

C1+

C1– I/O Signal I/O, Channel 1, Port C

C2+

C2– I/O Signal I/O, Channel 2, Port C

C3+

C3−I/O Signal I/O, Channel 3, Port C

9 SEL I Operation mode Select

(when SEL=0: A→B, when SEL=1: A→C

5, 8, 13,18, 20, 30,

40, 42 VDD Pwr 1.5V to 1.8V (±0.1V) Positive Supply Voltage

1, 4, 10, 14, 17, 19,

21, 39, 41, Center

Pad

GND Pwr Power ground

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3PS8866C 03/11/09

PI2PCIE2412

1.8V, PCI Express Gen2 Compliant,

4-Differential Channel, 2:1 Mux/DeMux Switch

Storage Temperature ....................................................–65°C to +150°C

Supply Voltage to Ground Potential ................................–0.5V to +2.5V

DC Input Voltage .............................................................. –0.5V to VDD

DC Output Current ....................................................................... 120mA

Power Dissipation ...........................................................................0.5W

Note: Stresses greater than those listed under MAX I MUM

RAT INGS may cause permanent damage to the de vice. This

is a stress rating only and func tion al op er a tion of the device

at these or any other conditions above those indicated in the

operational sections of this spec i ﬁ ca tion is not implied. Expo-

sure to absolute max i mum rating con di tions for extended

periods may affect re li abil i ty.

Maximum Ratings

(Above which useful life may be impaired. For user guide lines, not tested.)

DC Electrical Characteristics for Switching over Operating Range (TA = –40°C to +85°C, VDD = 1.5V to 2.0V)

Parameters Description Test Conditions(1) Min Typ(2) Max Units

VIH Input HIGH Voltage Guaranteed HIGH level

0.65 x

VDD

VIL Input LOW Voltage Guaranteed LOW level –0.5 0.35 x

VDD

VIK Clamp Diode Voltage VDD = Max., IIN = –18mA –0.7 –1.2

IIH Input HIGH Current VDD = Max., VIN = VDD ±5

μA

IIL Input LOW Current VDD = Max., VIN = GND ±5

Dynamic Electrical Characteristics Over the Operating Range (TA= -40º to +85ºC, VDD = 1.8V±10%, GND=0V)

Parameters Description Test Conditions Min. Typ.(2) Max. Units

XTALK Crosstalk See Fig. 1 for Measurement Setup, f= 3 GHz

f = 100 MHz

-23dB

-58dB dB

OIRR OFF Isolation See Fig. 2 for Measurement Setup, f= 3 GHz

f = 100 MHz

-23dB

-58dB

ILOSS Differential

Insertion Loss f= 3 GHz -2 dB

BW Bandwidth -3dB 4.1 GHz

Notes:

1. For Max. or Min. conditions, use appropriate value speciﬁ ed under Electrical Characteristics for the applicable device type.

2. Typical values are at VDD = 1.8V, TA = 25°C ambient and maximum loading.

Power Supply Characteristics

Parameters Description Test Conditions(1) Min. Typ.(2) Max. Units

ICC Quiescent Power Supply Current VDD = Max., VIN = GND or VDD 200 μA

Switching Characteristics (TA= -40º to +85ºC, VDD = 1.8V±10%)

Parameters Description Min. Max. Units

tPZH, tPZL Line Enable Time - SEL to AN, BN, CN0.5 8.0 ns

tPHZ, tPLZ Line Disable Time - SEL to AN, BN, CN0.5 8.0

tb-b Bit-to-bit skew within the same differential pair 7ps

tch-ch Channel-to-channel skew 35 ps

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4PS8866C 03/11/09

PI2PCIE2412

1.8V, PCI Express Gen2 Compliant,

4-Differential Channel, 2:1 Mux/DeMux Switch

Fig 1. Crosstalk Setup

Fig 2. Off-isolation setup

PI2PCIE2412

T R

HP11667A

50-ohm

HP4396B

100

-ohm

100

-ohm

PI2PCIE2412

T R

HP11667A

50-ohm

HP4396B

100

-ohm

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5PS8866C 03/11/09

PI2PCIE2412

1.8V, PCI Express Gen2 Compliant,

4-Differential Channel, 2:1 Mux/DeMux Switch

Fig 3. Crosstalk

Fig 4. Off Isolation

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6PS8866C 03/11/09

PI2PCIE2412

1.8V, PCI Express Gen2 Compliant,

4-Differential Channel, 2:1 Mux/DeMux Switch

Fig 5. Insertion Loss

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7PS8866C 03/11/09

PI2PCIE2412

1.8V, PCI Express Gen2 Compliant,

4-Differential Channel, 2:1 Mux/DeMux Switch

RT4pF

VDD

VIN VOUT

200-ohm

2 x VDD

Pulse

Generator D.U.T

Test Circuit for Electrical Characteristics(1-5)

Notes:

1. CL = Load capacitance: includes jig and probe capacitance.

2. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator

3. Output 1 is for an output with internal conditions such that the output is low except when disabled by the output control.

output 2 is for an output with internal conditions such that the output is high except when disabled by the output control.

4. All input impulses are supplied by generators having the following characteristics: PRR ≤ MHz, ZO = 50Ω, tR ≤ 2.5ns, tF ≤ 2.5ns.

5. The outputs are measured one at a time with one transition per measurement.

Switch Positions

Test Switch

tPLZ, tPZL (output on B-side) 2 x VDD

tPHZ, tPZH (output on B-side) GND

Prop Delay Open

Switching Waveforms

Voltage Waveforms Enable and Disable Times

tPLZ

VDD/2 VDD/2 VDD

VOH

VOL

VDD/2

tPHZ

tPZL

tPZH

Output 1

Output 2

VOL

VOH

SEL

VOL + 0.15V

VOH – 0.15V

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8PS8866C 03/11/09

PI2PCIE2412

1.8V, PCI Express Gen2 Compliant,

4-Differential Channel, 2:1 Mux/DeMux Switch

Test Circuit for Dynamic Electrical Characteristics

D.U.T.

Port2

Port1 Network Analyzer

Applications Information

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd

PCI Express Application Speciﬁ c Measurements and Test Set-up

Figure 5: Test Setup

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9PS8866C 03/11/09

PI2PCIE2412

1.8V, PCI Express Gen2 Compliant,

4-Differential Channel, 2:1 Mux/DeMux Switch

Figure 6: 5 Gbps RX signal eye of the PCI-SIG compliance software test using PI2PCIE2412 + 16" test card

Figure 7. 5 Gbps RX signal eye of the PCI-SIG compliance software test with no switch + w/ 16" test card

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10 PS8866C 03/11/09

PI2PCIE2412

1.8V, PCI Express Gen2 Compliant,

4-Differential Channel, 2:1 Mux/DeMux Switch

Ordering Information

Ordering Code Package Code Package Description

PI2PCIE2412ZHE ZH Pb-free & Green, 42-contact TQFN

Notes:

• Thermal characteristics can be found on the company web site at www.pericom.com/packaging/

• "E" denotes Pb-free and Green

• Adding an "X" at the end of the ordering code denotes tape and reel packaging

Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com

Packaging Mechanical: 42-Contact TQFN (ZH)

DESCRIPTION: 42-contact Thin Fine Pitch Quad Flat No-Lead (TQFN)

PACKAGE CODE: ZH (ZH42)

DOCUMENT CONTROL #: PD-2035 REVISION: C

DATE: 02/17/09

Notes:

1. All dimensions are in millimeters, angles in degrees.

2. Coplanarity applies to the exposed thermal pad as well as the terminals.

3. Refer JEDEC MO-220

4. Recommended Land Pattern is for reference only.

5. Thermal Pad Soldering Area

09-0116

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