8 Detailed Description

8.1 Overview

The HD3SS212 is a high-speed passive switch offered in an industry standard 48-pin u*BGA package available

in a common footprint shared by several other vendors. The device is specified to operate from a single supply

voltage of 3.3 V over the industrial temperature range of -40°C to 105°C.

The HD3SS212 is a generic 4-CH high-speed mux/demux type of switch that can be used for routing high-speed

signals between two different locations on a circuit board. The HD3SS212 will also support several other high-

speed data protocols with a differential amplitude of < 1800 mVpp and a common-mode voltage of < 2.0 V, as

with USB 3.0 and DisplayPort 1.2. For Display Port Applications the HD3SS212 also supports switching of both

the Auxiliary and Hot Plug Detect signals.

The device’s High Speed Port Selection Control input (Dx_SEL) pin can easily be controlled by an available

GPIO pin within a system.

8.2 Functional Block Diagram

Dx_SEL

HPDA

HPDB

VDD

OE

GND

AUXA (p)

AUXA (n)

AUXB (p)

AUXB (n)

DAz (p)

DAz (n)

DBz (p)

DBz (n)

SEL

SEL

SEL

HD3SS212

SEL = 0

SEL = 1

4

4

4

4

4

4

(z = 0,1, 2or3)

HPDC

DCz (p)

DCz (n)

AUXC (p)

AUXC (n)

SEL = 1

SEL = 0

SEL = 1

SEL = 0

125kW

8.3 Feature Description

Refer to Section 8.2.

HD3SS212

SLAS822D – DECEMBER 2011 – REVISED DECEMBER 2020

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