6 Detailed Description

6.1 Overview

The TS3USB221E device is a 2-channel SPDT switch specially designed for the switching of high-speed USB

2.0 signals in handset and consumer applications, such as cell phones, digital cameras, and notebooks with

hubs or controllers with limited USB I/Os. The wide bandwidth (1 GHz) of this switch allows signals to pass

with minimum edge and phase distortion. The device multiplexes differential outputs from a USB host device to

one of two corresponding outputs. The switch is bidirectional and offers little or no attenuation of the high-speed

signals at the outputs. The device also has a low power mode that reduces the power consumption to 1 μA for

portable applications with a battery or limited power budget.

The device is designed for low bit-to-bit skew and high channel-to-channel noise isolation, and is compatible with

various standards, such as high-speed USB 2.0 (480 Mbps).

The TS3USB221E device integrates ESD protection cells on all pins, is available in a SON package (3mm ×

3mm) as well as in a tiny μQFN package (2mm × 1.5mm) and is characterized over the free-air temperature

range from –40°C to 85°C.

6.2 Functional Block Diagram

D−

D+

1D−

1D+

2D−

2D+

S

OE

Digital Control

6.3 Feature Description

6.3.1 Low Power Mode

The TS3USB221E has a low power mode that reduces the power consumption to 1 μA when the device is not in

use. To put the device in low power mode and disable the switch, the bus-switch enable pin OE must be supplied

with a logic high signal.

6.4 Device Functional Modes

Table 6-1. Truth Table

S

OE

FUNCTION

X

H

Disconnect

L

L

D = 1D

H

L

D = 2D

TS3USB221E

SCDS263E – SEPTEMBER 2009 – REVISED JULY 2024

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