Part Number: TS3USB221RSER

Manufacturer: Texas Instruments

Description: IC USB SWITCH DUAL 1X2 10UQFN

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Technical Specifications of TS3USB221RSER

Datasheet  TS3USB221RSER datasheet
Category Integrated Circuits (ICs)
Family Interface – Analog Switches – Special Purpose
Manufacturer Texas Instruments
Packaging Tape & Reel (TR)
Part Status Active
Applications USB
Multiplexer/Demultiplexer Circuit 2:1
Switch Circuit SPDT
Number of Channels 2
On-State Resistance (Max) 6 Ohm
Voltage – Supply, Single (V+) 2.3 V ~ 3.6 V
Voltage – Supply, Dual (V±)
-3db Bandwidth 1.1GHz
Features Bi-Directional, USB 2.0
Operating Temperature -40°C ~ 85°C (TA)
Package / Case 10-UFQFN
Supplier Device Package 10-UQFN (2.0×1.5)

TS3USB221RSER Description

The TS3USB221 is a high-bandwidth switch optimized for switching fast USB 2.0 signals in mobile and consumer devices like smartphones, digital cameras, and laptops with USB hubs or controllers that have a limited number of USB I/Os. This switch has a wide bandwidth (1.1 GHz), so it can let signals through with little to no edge or phase distortion.

The device multiplexes a USB host device’s differential outputs to one of two identical outputs. The switch can be used either way and slows down the high-speed impulses very little. The TS3USB221 is optimized for strong channel-to-channel noise isolation and minimal bit-to-bit skew. High-speed USB 2.0 (480 Mbps) is just one of many protocols that work with the TS3USB221.

TS3USB221RSER Features

  • VCC can work between 2.3 V and 3.6 V.
  • Signals up to 5.5 V can be sent to VI/O.
  • Cio(on) = 6 pF maximum.
  • low power use (no more than 30 A).
  • ESD > Human Body Model (HBM) 2000-V
  • high bandwidth (mostly 1.1 GHz).

TS3USB221RSER Detailed Description

The TS3USB221 is a 2-channel SPST switch designed to switch high-speed USB 2.0 signals in handset and consumer applications like cell phones, digital cameras, and computers with hubs or controllers that have a limited number of USB I/Os. This switch has a wide bandwidth (1.1 GHz), so it can let data through with little to no edge or phase distortion.

The device changes the differential outputs of a USB host device into one of two similar outputs. The switch can be used in either direction, and it doesn’t slow down the fast impulses by much.

The device also has a low-power mode that cuts current use to 1 A for battery-powered or other low-power uses. The device meets a number of standards, such as USB 2.0’s fast transfer rate of 480 Mbps, and has low bit-to-bit skew and good noise separation between channels. The free-air temperature range for the TS3USB221 device is -40°C to 85°C. It has ESD safety cells on all pins and comes in a small QFN package (2 mm by 1.5 mm).

TS3USB221RSER Feature Description

Using less energy When not in use, the TS3USB221’s low power mode reduces power consumption to 1 A. To put the switch into low power mode and turn it off, a logic high signal must be applied to the bus-switch enable pin OE.

Application Information

The number of USB I/Os available on USB hubs or controllers is often insufficient for a given USB application. The TS3USB221 is able to add more USB I/Os because it can switch between multiple USB buses and connect them to a single USB hub or driver. Alternatively, TS3USB221 can be used to link two USB ports to a single controller.

Power Supply Recommendations

The VCC pin provides the device with power in accordance with the specifications of USB versions 1.0, 1.1, and 2.0. To improve load regulation across the frequency range, TI suggests positioning a bypass capacitor as close as feasible to the supply pin VCC.

Layout Guidelines

As close as possible, the VCC pin should be to the bypass capacitors. Don’t touch the D+ and D-lines with the bypass caps. If the high-speed D+/D- lines are different by more than 4 inches, the eye diagram won’t work as well. For a high-speed USB link, a differential characteristic impedance shielded twisted-pair cable is used. To get the most out of the wire, its differential impedance should match that of the D+ and D- traces in the design. When routing high-speed USB signals, use as few vias and corners as possible. This will reduce signal echoes and changes in impedance. To lower the capacitance that a tube adds, there must be room around it.

With each via, the signal’s path is changed, and the layers of the board become more likely to cause confusion. Be careful about using test points with through-hole pins on twisted-pair lines. When you need a 90-degree turn, you should use two 45-degree turns or a circle instead. This cuts down on sudden changes in impedance, which makes signal-trace echoes less likely to happen. Crystals, oscillators, switching regulators, mounting holes, magnets, and integrated circuits are all examples of parts that can make or copy clock signals. USB traces should not be run below or near these parts. Stubbs can reflect high-speed USB signals, so you should try to stay away from them at all times. If you have to use a stub, it should be less than 200 millimeters long.

High-speed USB data must be sent along straight lines (VCC or GND) without any breaks. Plane breaks often have anti-etch that shouldn’t be crossed. Due to the high frequencies of USB, it is best to use a printed circuit board with two data layers, a ground layer, and a power layer.


In conclusion, the TS3USB221 is a highly efficient 2-channel SPDT switch made for high-speed USB 2.0 signals in consumer applications like cell phones, digital cameras, and laptops. With a bandwidth of 1.1 GHz, it lets data through with minimal edge and phase distortion. Its low bit-to-bit skew and high channel-to-channel noise isolation make it compatible with many standards. The gadget also works in both directions and slows down high-speed signals very little, if at all, at the outputs. It also has a low-power mode that uses only 1 A of power when it’s not in use.

This makes it a great choice for portable apps with limited power budgets. Proper layout rules, such as putting bypass capacitors close to the VCC pin, avoiding putting bypass caps near D+/D- traces, and matching the impedance of D+/D- traces to cable characteristic impedance, ensure the best performance. Overall, the TS3USB221 is a flexible and reliable switch that can expand limited USB I/Os, connect a single controller to two USB connectors, and switch USB signals efficiently in a variety of consumer applications.

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