Home Menu
Home » Products » Signal Switch IC / Multiplexers

Signal Switch IC / Multiplexers

Switch ic

High-speed signal routing is Pericom’s focus within the Silicon Switch™ product family such as Signal Switch IC and Multiplexers. Our patented Charge Pump technology provides the highest signal integrity and achieves the most efficient and clear signal routing for data rates up to 12 Gbps.

Pericom is a member of PCI-SIG®, HDMI™, USB.org, and VESA®. Pericom’s PCI-Express® 1.0, 2.0 and 3.0, HDMI, DVI, DisplayPort™, LVDS, USB 2.0 with SuperSpeed 3.0, and SATA2.0, SATA3.0, SAS1.0, SAS2.0, 10GE, Thunderbolt signal switches have all been designed with the application clearly in mind. Customers that design for digital television, set-top box, notebook PC and desktop PC applications benefit from our breadth of knowledge and design technology in routing high-speed signals across PCB or cables.

See our Type-C connector solution.

There are 3 categories of signal switches/multiplexers. They are Analog Switch, Digital Bus Switch and Protocol Switch.

Find Signal Switch IC / Multiplexers

Show All
Select the parameters below to find the solution you need.
Protocol Application Type Analog/Digital Voltage Signal Type Features
Additional Features

Signal Switch IC / Multiplexers Details

Analog Switch Features

We offer a wide voltage range, fast speeds and advanced packaging options ideal for ultra mobility applications.These switch solutions feature low noise, low voltage and low on-resistance with 50 functions offered in SPST, SPDT and Mux.

Benefits:

  • Low noise in 1.8 V - 17 V
  • 50 functions offered in SPST, SPDT, and Mux
  • Low voltage & low on-resistance combinations

Analog Video Switches

Two concerns observed by the majority of design engineers designing systems with analog video signals are the high current consumption the video DAC requires to drive an analog video display and the impedance linearity of the transmission lines that these signals travel across.

In terms of impedance linearity, this concern is larger when switches are added to the equation. However, with Pericom’s patented charge-pump technology we are able to offer very flat Ron switches that provide ideal linearity in terms of impedance control such that signal routing is ideally accomplished. In terms of power consumption concerns, Pericom’s patent-pending technology is able to turn off Video DACs when they are not needed by intelligently monitoring and detecting when VGA displays are connected or not to the Video source.

Digital Bus Switch Features

PI3CH digital bus switch products are ideally suited to address the operational requirements of next generation Servers, RAID, Super VGA, Memory Bank Switching, and Network/Telecom Backplanes.

The Low-voltage (2.5 V/3.3 V), High-bandwidth (500 MHz) Bus Switches offer expanded performance capabilities that work well with PCI-X, and DDR-I / DDR-2 memory standards, while simplifying the I/O migration from parallel to serial differential signaling standards. The 5 V I/O tolerance and beyond rail-to-rail capability makes the PI3CH Switch ideal for bridging legacy 5 V I/O based platforms to next generation 2.5 V/3 V systems.

Offering a combination of Mux ratios & wide buses

  • 5 V/3 V or 3 V/2.5 V translation
  • Hot-docking/hot-plugging
  • Bus and load isolation
  • Resistor termination switches
  • Motherboard memory expansion and DDR isolation

Application Specific Switches

Benefits:

  • High performance switches to minimize return loss (-20dB @ 5GHz)
  • Offer quick switch solutions that consume <500µW of total power consumption (solutions available for HDMI, DVI, DispalyPort, VGA, S-Video, or CVBS)
  • Ideal USB2.0/3.0 data-switches allocate full bandwidth to either port with very low bit to bit skews and very low added jitter
  • LAN multiplexing 10/100 and gigabit Ethernet
  • Differential broadband switches for SATA2, SAS, XAUI to 3.2 Gbps

USB

Our vision is to allow designers to re-purpose their USB connectors for multiple applications. Driving USB data communication is the normal approach, but we provide solutions that allow users to expand the USB connector usage to high current charging, driving audio signals for smartphone audio dock applications, driving 1080p video (via MHL signaling), support debug activities by supporting UART signals over the D+/D- pins of the USB connector and now that USB 3.0 is available, also multiplexing PCIe and USB 3.0 signals onto the same traces.

Benefits:

  • Support for USB 1.1, USB 2.0 Full Speed, and USB 2.0 High Speed
  • Ideal impedance specific to each standard ensuring high signal integrity
  • Combined audio switching for handheld applications
  • Low power for battery powered applications

LAN Switch

Benefits:

  • Supports all 10/100/1000 Ethernet specs
  • 5 V and 3 V supply voltage operation
  • Replaces second PHY to support additional ports
  • Deal impedance for low signal attenuation of Ethernet signals
  • Cost saving solution in notebook design

PCI Express Packet Switch

Benefits:

  • 4 Port, 4 Lane and/or 4 Ports, up to 24 Lanes
  • Cost efficient
  • Customer programmable
  • EEPROM configurable
  • Advanced packaging

SATA, SAS, XAUI Switch

Benefits:

  • 3.2 Gbps data rate
  • Devices support 1 or 2 ports
  • 1:2 mux/demux function
  • High ESD tolerance

HDMI

Pericom’s HDMI switches support the latest Energy Star requirements by offering the worlds lowest power consuming solutions. We also support the latest HDMI 1.4 requirements such as ARC and 3.4 Gbps demands. Whether your application has routing difficulties or signal integrity issues, or both, Pericom has an HDMI solution for you!

Display Port

Pericom’s displayPort switches allow designers to obtain higher flexibility. We offer switches that can eliminate deterministic jitter, switches that can route DP signals with low signal degradation, and switches with intelligent power management that allows for automatically powering down the IC when not needed.

Signal Switch IC / Multiplexers FAQs

Are Pericom devices rated for the industrial temperature range (-40C to +85C)?

Some Pericom devices are rated for the industrial temperature range (-40C to +85C) as specified in the datasheet.

Are the switches with a PMOS pull-up resistor suitable for live-insertion and power sequencing applications?

No, because during live insertion, at the moment of connection, the voltage at Vcc pin is 0V due to the delay caused by the bypass capacitance. The PN junction of the PMOS pull-up resistor at the B-side of the switch will forward the signal to ground through the Vcc pin at 0V. The above case is the same for a power sequencing situation. Refer to Application Brief 39 for more details.

Are there SPICE models available?

Pericom has IBIS models available on the web for most products. SPICE model requests can be considered depending on application situation.
Please contact Pericom Customer Support for further information.

Can HPD pin be connected to +5V directly?

Per HDMI Spec 1.4, HPD should be pulled high to 5V through a 1kΩ resistor.

Can I use the PI3CHxx switches for 5V to 3.3V voltage translation?

It is not recommended to use the PI3CHxx family for the voltage translation application, because the PI3CHxx family is not designed for voltage translation application. Please find proper devices at Voltage Translation Page.

Can one single EEPROM be implemented at Scalar in HDTV instead of several EEPROMs at input HDMI connectors?

Per HDMI requirement, EEPROM is readable in power-off condition.  In other words, if DDC lines from HDMI connector can pass through Pericom switches and read the EEPROM at Scalar when only standby power is present in HDTV and when +5V is supplied from HDMI connector, one EEPROM implementation at Scalar is allowed.

Can Pericom provide Spice model for simulation?

Spice model for simulation is available upon request. Please contact Pericom Customer Support.

Can PI3HDMI412FT-x be employed in 1.8Vcc application?

Yes.  For 1.8V application, Vcc and Vss of , PI3HDMI412FT-B should be set to 1.8V and GND, respectively.

Do Pericom's active switches support RxSense feature?

PI3HDMI101, supports RxSense feature. With a detection scheme implemented in PCB, output TMDS of PI3HDMI101(-A) will be turned off if Sink termination is absent. Please refer to the Application Note (AN216)

A built-in detection circuit, which offers RxSense feature, is implemented in PI3HDMI101-B in order to save some external components and circuitry.

Do you have evaluation boards for your analog switches?

Pericom may provide an evaluation board, especially made using a flexible board, but it depends on the particular situation. Please contact Marketing.

Has Pericom's PI3USB10M or PI3USB10LP-A or PI3USB102 passed USB 2.0 compliance?

Yes, all parts have passed compliance through third party Tier 1 product validations.

How can I use PI5Cxx switches for 5V to 3.3V voltage translation?

When using the PI5Cxx switch family for 5V to 3.3V voltage translation, apply a 4.1V to 4.2V voltage to the Vcc pin of the PI5Cxx switch, by either inserting a diode with 0.8V forwarding V-drop in series to the Vcc pin and with a 2.2K resistor between the Vcc and GND pins; or, using a voltage divider consisted of two resistors between the Vcc and ground generating a 4.1V voltage to the Vcc pin of the PI5Cxx switch. Adjust the Vcc level until the high level of the output signal of the switch is 3.3V. Both approaches need a 0.47uf between the Vcc and GND pins for de-coupling. Please also see Voltage Translation Page.

How can the capacitance leakage between the input and the output of the switch be canceled?

Adding a 1K pull-up or pull-down resistor at the output of the switch when the switch is off will absorb the capacitance leakage from input. This 1K resistor is recommended especially for analog applications.

How can the PI3L301D be used to reduce the cost of a Notebook Gigabit Ethernet application?

Adding a PI3L301D in a Notebook PC to switch the signals from the MAC between the RJ-45 on the Notebook and the RJ-45 in a docking station will remove the need for a MAC populated in the docking station and will reduce the overall system cost.

How do I know if a device has been obsoleted? I am unable of find the datasheet on the Pericom website.

If the datasheet is not found on Pericom's website, it is a strong indication that the part has been obsoleted. there are several ways to find out.  The first method would be to check on the Product Detail page for your particular product choice, if there are related PDN notices, they will show up on the tab, marked "PDNS".

Alternatively go Discontinuation Notices to search for the part number.

How does an NMOS switch translate voltage?

The NMOS transistor in the switch core clamps the input signal voltage to V_clamp (Vout) at the output due to the threshold of NMOS transistor (V_ threshold). V_clamp = Vcc V_threshold. If the input signal is below V_clamp, the switch will pass through the full voltage range to the output without clamping. If the input voltage is higher than V_clamp, the switch will clamp the output at V_clamp. Designers can select the clamping voltage by adjusting the Vcc voltage.

How many switch types are there in the Pericom switch families?

There are three typical switch types: the NMOS switch, the NMOS switch with charge pump on the gate, and the CMOS (NMOS || PMOS) switch.

How to cancel the excessive Icc current seen in analog switch application with 8V (or above) Vcc and 3.3V/5V control signal?

In order to cancel the excessive Icc, the control signal needs to be rail-to-rail and its logic high needs to reach the Vcc voltage. Another approach is to add a resistor on the Vcc pin to reduce the excessive current but the trade off is the resulting Vcc voltage drop caused by the resistor and the excessive current.

How to prevent a switch from been turned on by heavy undershoots?

Undershoot below -0.7V will turn on the switch when it is off, if the switch does not have an undershoot-protection function. A common approach to prevent the switch from being turned on is to add a Schottky diode with 0.4V forwarding drop in reversal direction between the input and ground of the switch.

Is the A side and the B side of the PI5Cxx switch identical for the 5V to 3.3V voltage translation?

Yes, The A side and the B side of PI5Cxx are identical for 5V to 3.3V voltage translation.

Is the TMDS swing specification of DVI different from that of HDMI?

The TMDS swing specification of DVI is the same as that of HDMI.

Is there a Pericom analog switch for low noise operation?

All the Pericom PI5Axx and PI3Axx analog switches are for low noise operation.

Is there a replacement for an obsolete part?

Not all obsolete parts will have a direct replacement. However, we recommended that you contact your regional sales office.

What are the advantages of a CMOS switch?

Wider Vcc range, rail-to-rail output voltage without clamping, lower power consumption (10uA typical) and fast switching time.

What are the advantages of an NMOS switch with a gate-charge-pump (PI3CXX, PI3L301D)?

Wider Vcc range, rail to rail output voltage without clamping, lower C-on and C-off, suitable for hot-plug and hot-swap applications.

What are the advantages of using an NMOS switch?

Fast switching time, 1.5ns typical. Low power consumption, less than 10uA at quiescent mode. Low C-off and C-on. Suitable for hot-plug and hot-swap applications.

What are the disadvantages of a CMOS switch?

Higher C-on and C-off and not suitable for hot-swap.

What are the disadvantages of NMOS switch with a gate-charge-pump (PI3CXX, PI3L301D)?

The power consumption is slightly higher, 260uA typical and the switching time is slightly slower than NMOS (PI5CXX) and CMOS (PI3BXX) switches.

What are the disadvantages of using an NMOS switch?

A 5V NMOS switch clamps the output voltage to 4.0V, if the input voltage is above 4V while the Vcc is 5V and if the threshold of the NMOS is 1V. The NMOS switch can only work at 5V Vcc, because at lower Vcc, the output voltage is clamped too low.

What are the PCB routing considerations for PI3L301D?

In order to reduce the return loss, the PI3L301D switch needs to be populated between the PHY transceiver and the termination resistors, as close to both the PHY transceiver and the termination resistors as possible, less than 3mm if feasible. The traces between the PHY transceiver, the switch, the magnetic and the RJ-45 need to be as short as possible, and are with 100-ohm differential impedance.

What are the types of jitter?

There are several types of jitter, but the main ones are: cycle-to-cycle jitter, period jitter, half period jitter, and peak-to-peak jitter. Jitter terminology can be found in AB36: Jitter Measurement Techniques at Application Brief No. 36 or Application Note No. 27.

What is a CMOS switch?

The CMOS switch core consists of an NMOS and a PMOS transistor in parallel as mirror images to each other. When the CMOS switch is "on, the V_gate of the NMOS transistor is equal to Vcc while the V_gate of the PMOS transistor is 0V. When the input voltage rises and reaches the threshold of the PMOS transistor, the PMOS is turned off while the NMOS becomes more conductive, and vice-versa for the falling edges of the input. Thus, the CMOS switch will pass through the full range of the input voltage without clamping. Pericom , PI3BXX, PI5AXX, PI5LXX, and PSXX switch families are CMOS technology switches.

What is a NMOS switch?

An NMOS switch, used in the PI5CXX family, has an NMOS (Negative-Channel Metal Oxide Semiconductor) transistor for its switch core.

What is hot-plug?

Hot-plug indicates that the devices, including switches populated on the motherboard (backplane), will turn off the power and signals to the hot-plug connectors during hot insertion, thus, there is no power and signal activity on the connectors while the system is still running. All Pericom switches are suitable for hot-plug.

What is hot-swap?

Hot-swap indicates that the connectors on the motherboard (backplane) are alive with signal and power during hot-swap. The switches populated on the hot-swap card should tolerate the impact from hot swap without clamp or distort the signal from motherboard. Pericom PI5Cxx, PI3Cxx, and PI3VTxx families are suitable for hot-swap. (Refer to the PCI standards "Compact PCI Hot-Swap Specification R1." and "PCI Hot-Plug specification R1." for details).

What is power sequencing?

Power sequencing indicates that the voltage at the Vcc pin is 0V while the input signals are applied to the in/out pins of the switch. It is a similar condition to hot-swap. Therefore the switches that work for hot-swap applications also apply to power sequencing.

What is the allowable Vcc variation range? The nominal Vcc specified in the datasheet is 2V to 6V.

The Vcc range for PI5A121C is 2V to 6V +/-5%.

What is the application suitability comparison between a switch and a logic driver?

A switch is a passive device with C-on and R-on that will attenuate the signal. A logic driver is an active device that will refresh an input signal at output by its active driving ability. Thus, compared to a logic driver, the maximum frequency of an application using a switch is limited by the trace length and the capacitive load. It is recommended to use a logic driver for applications with heavy capacitive load, long trace and high frequency.

What is the bandwidth and operating frequency of PI5Cxx?

The bandwidth of the PI5Cxx switch is above 200MHz. The maximum operation frequency depends on the specific application condition: the higher the capacitive load, or the longer the trace length; the lower the operation frequency. The best way to determine the maximum operation frequency is to simulate the PI5Cxx's IBIS model.

What is the cause of the excessive Icc current seen in analog switch application with 8V (or above) Vcc and 3.3V/5V control signal?

When the Vcc is 8V or above, a 3.3V/5V-control signal will turn on both the NMOS transistor and the PMOS transistor in the driver between the control pin and the gate of the switch. Thus, an excessive current from Vcc will pass through the PMOS and the NMOS to ground.

What is the input voltage range and the input voltage versus the output voltage and the R-on?

The PI3L110 switch has a wide input signal voltage range. At 3.3V Vcc, from -0.5V to +5V, with low and flat R-on and the output voltage will follow the input voltage in this range. At 3.3V Vcc, when the input signal is -0.5V to 3.3V, the R-on is 4ohm/5ohm typical, when the input signal higher than 3.3V, the R-on is getting slightly higher but will be below 9ohm when the input signal is reaching 5V.

What is the jitter from PI3VTxx added to the signal passing through it?

The PI3VTxx family is a passive device and theoretically it will not add jitter to the signals other than the small thermal noise.

What is the lead finish for Pericom products? What about lead-free?

All Pericom's products that are not lead-free are composed of 85% Sn and 15% Pb. For lead-free products, they are composed of 100% matte Sn. Lead-free products are marked and ordered with the letter "E" suffix at the end of the part number.

What is the leakage current of the input and output pins of the PI3Axx switches when the power is down?

It is not recommended to use the PI3Axx switch family for the power sequencing application, in which the signals apply to the input and output pins while the power is down. The parasitic diodes in the PMOS of the switches will clip the input signals to the ground when the power is down.

What is the lowest input TMDS voltage that Periocm IC can accept?

The lowest single-ended TMDS voltage that Peicom IC can accept is 2.0V.  At the same time, the max offset of the DC voltages between TMDS + and – is 0.25V.

What is the maximum bandwidth of the PI3VTxx family?

The maximum bandwidth of the PI3VTxx family is above 200 MHz (this depends on the capacitive load and the trace/cable length)

What is the maximum frequency for applications using switches?

Normally, if the capacitive load is higher than 30pf and the trace is longer than 6 inches, the maximum frequency would be limited at 100MHz, otherwise heavy signal attenuation will result. The best way to determine the maximum frequency in a specific application is to simulate the switch using the IBIS models available on the Pericom website or by specific request.

What is the output voltage when the input is 3.3V and the Vcc is 5V?

At 5V Vcc, if the input is 3.3V, the output will also be 3.3V without clamp.

What is the power consumption in standby or power-down mode?

Some of Pericom switches offer standby or power-down mode, in which power consumption is around 1mA.

What is the purpose of the gate-charge-pump of an NMOS switch?

The purpose of the charge pump at the gate of the NMOS transistor is to increase the voltage at the gate in order to avoid the output voltage clamp caused by the threshold voltage.

What is the R-on and C-on of the PI3L301D switch?

The R-on of PI3L301D is below 5-ohm with flatness less than 1-ohm, while with the C-on about 9pf, which is the lowest combination in the switch market resulting in excellent return-loss and low insertion loss suitable for high speed application including Gigabit LAN, DDR, LVDS, LVPECL, USB 2.0 etc.

What is the recommended circuit for 5V to 3.3V voltage translation using an NMOS switch from the PI5CXX family?

Adding a diode with 0.7V forwarding drop in series to the Vcc pin, adding a 10uf capacitor, a 0.47uf capacitor and a 5K resistor between the Vcc pin and ground. Refer to Application Note 1 for more details.

What is the recommended circuit for 5V to 3.3V voltage-translation in PCI application using the PI5C32X245 switch?

The  must be populated on the live-insertion card between the 5V PCI connector and the 3.3V ASIC. This application requires adding a diode with 0.7V forwarding drop in series to the Vcc pin of, adding a 10uf capacitor, a 0.47uf capacitor and a 5K resistor between the Vcc pin and ground. The ground pins of the live-insertion card and the motherboard must be connected before any other pins. Otherwise the voltage from the PCI connector will go wild due to lack of ground reference and will damage the switch.

What is the recommended circuit for hot-swap using the PI3CXX family?

The PI3CXX switch needs to be populated on the hot-swap card between the connector and the ASIC on the card to tolerate the impact from hot-swap. The ground pins of the card and the back plane must be connected before any other signal or power pins. Otherwise the signal at the input of the switch will go wild due to lack of ground reference and will damage the switch.

What is the rectangle copper pad on the bottom of TDFN and TQFN packages, and should it be connected to the ground?

he rectangle copper pad on the bottom of some of the TDFN / TQFN packages is internally connected to the substrate of the die. It can be either floating or connected to the ground of the PCB.

What is the relation between the input, output and the Vcc voltage?

When the Vcc is in the range of 3.0V to 3.6V, the nominal input signal voltage range is -0.5V to Vcc + 0.5V and the output will follow the input signal level without clamp.

What switch families are not recommended for hot-swap and power sequencing applications?

All the CMOS switch families including , PI3BXX, PI5AXX, PI5LXX, PSXX are not suitable for hot-swap applications. The switch sides with PMOS pull-up resistors are also not suitable for hot-swap and power sequencing applications.

What switch families are recommended for hot-swap and power sequencing applications?

PI3CXX, PI5CXX and PI3VTXX families are recommended for hot-swap and power sequencing applications.

What switch is suggested for 5V to 3.3V voltage-translation in PCI bus application?

The  is suggested for 5V to 3.3V voltage-translation in PCI bus application, because the  is hot-swap capable and is an NMOS switch that can perform voltage translation.

What the inter-pair and intra-pair skews of Pericom's passive switches?

Inter-pair and intra-pair skews are typically less than 30ps for passive switches.  However, these two parameters are not specified in Pericom's datasheet.

Where can I find Mean Time Before Failure (MTBF) or Failures In Time (FIT) values for Pericom products?

FIT and MTBF data can be found at Pericom's Quality webpage.

Where can I find the information on your Pb-free and "Green" packaging?

Lead (Pb)-Free and Green information can be found on individual datasheets or Pb-Free & Green Page.

Where can I find the package marking, ordering info, and package dimensions for logic devices?

All packaging mechanicals, top marking, ordering details, thermal data, Pb-free, Tape and Reel, and more can be found at Packaging Page.

Where should the termination resistors be populated?

When there are two PHY transceivers both connected to the B side of the PI3L301D switch, and one PHY is far away from the switch, it is suggested to populate the termination resistors between the switch and PHY's as close to the PHY as possible, within 3mm is feasible.

Which bus switch family is hot swappable and works at 3.3V Vcc?

The PI3CHxx family is hot-swappable and works at 3.3V Vcc.

Which switch families are more suitable for high-speed applications?

It depends on the application needs: Faster Switching Time, or Higher Signal Speed. NMOS switches like the PI5CXX and PI3CXX have lower C-on therefore causing less insertion-loss than PI3BXX switch at speed higher than 100MHz. The PI3CXX has slower switching time than PI5CXX and PI3BXX since it takes longer for the charge pump to charge up. CMOS switches like the PI3BXX have higher C-on from their two transistors, approximately double that of pure NMOS switches, and will cause more attenuation at speeds higher than 100MHz.

Which switch is recommended for both of the 100 Base FX application with PECL signal and the 100 Base Tx signal?

It is recommended to use the PI3L110 switch for both of the 100 Base FX application with PECL signal and the 100 Base TX application. PI3L110 switch can pass through both these signals without clipping.

Why is a CMOS switch not suitable for hot-swap or power sequencing applications?

The PN-junction in the PMOS transistor portion of the switch core will forward the input signals to the Vcc pin at 0V delayed by the bypass capacitance and will cause problems with the system. Refer to Application Brief 39 and Application Note 52 for more details.

Why is a CMOS switch not suitable for live insertion applications?

During live insertion, at the moment of connection, the voltage at Vcc pin is 0V due to the delay caused by the bypass capacitance. The PN junction of the PMOS transistor in the switch core will forward the signal from the back plane to ground through the Vcc pin at 0V. Refer to Application Brief 39 for more details.

Why is a switch that has a PMOS pull-up resistor not suitable for hot-swap or power sequencing applications?

The PN-junction in the PMOS pull-up resistor will forward the input signal to the Vcc pin at 0V due to power-off state or be delayed by the bypass capacitance and will cause problems with the system. Refer to Application Brief 39 and Application Note 52 for more details.

Will a negative input signal below 0V cause a problem?

The input signal range of the PI5Axx switches is normally from -0.5V (refer to the datasheet for the negative voltage of a specific switch) to 5.5V when the Vcc is 5V. When the switch is on, a negative signal above -0.5V will pass through the switch without a problem. But a negative signal below -0.7V will be clamped by the ESD diode in the switch. The negative signal below -0.7V will also turn on the switch when it is set off.

Will a small input noise below 300mV affect the output when the switch is off?

When the switch is off, a small input noise will not cause a notable noise at output since the PI3Bxx switch has a good off isolation.

Will the Vcc noise within 300mV p-p affect the output?

The Vcc noise in a normal range (below 300mV) will not cause a notable noise in the output because the capacitance between the Vcc and the switch core is less than 10pf and the Vcc ripple will not change the R-on of the switch.