1B1

1A

OE

1B2

SW

SW

2B1

2A

2B2

SW

SW

3B1

3A

3B2

SW

SW

4B1

4A

4B2

SW

SW

S

4

7

9

12

1

15

2

3

5

6

11

10

14

13

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

SN74CB3Q3257

SCDS135B – SEPTEMBER 2003 – REVISED JUNE 2015

SN74CB3Q3257 4-Bit 1-of-2 FET Multiplexer/Demultiplexer

2.5-V/3.3-V Low-Voltage High-Bandwidth Bus Switch

1 Features

2 Applications

1

•

High-Bandwidth Data Path

•

IP Phones: Wired and Wireless

(up to 500 MHz)

•

Optical Modules

•

5-V Tolerant I/Os With Device Powered Up or

•

Optical Networking: Video Over Fiber and EPON

Powered Down

•

Private Branch Exchange (PBX)

•

•

WiMAX and Wireless Infrastructure Equipment

Characteristics Over Operating Range

3 Description

•

Rail-to-Rail Switching on Data I/O Ports

The SN74CB3Q3257 device is a high-bandwidth FET

bus switch utilizing a charge pump to elevate the gate

–

voltage of the pass transistor, providing a low and flat

–

•

Bidirectional Data Flow With Near-Zero

Propagation Delay

Device Information(1)

•

Low Input and Output Capacitance Minimizes

PART NUMBER

PACKAGE

BODY SIZE (NOM)

Loading and Signal Distortion

SN74CB3Q3257D

SOIC (16)

9.90 mm × 3.91 mm

SN74CB3Q3257DB

SSOP (6)

6.20 mm × 5.30 mm

•

SN74CB3Q3257DGV

TVSOP (16)

3.60 mm × 4.40 mm

Maximum)

SN74CB3Q3257DBQ

SSOP (16)

4.90 mm × 3.90 mm

•

Data and Control Inputs Provide Undershoot

SN74CB3Q3257PW

TSSOP (16)

5.00 mm × 4.40 mm

Clamp Diodes

SN74CB3Q3257RGY

VQFN (16)

4.00 mm × 3.50 mm

•

Low Power Consumption

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

•

Logic Diagram (Positive Logic)

•

Data I/Os Support 0- to 5-V Signaling Levels

(0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V)

•

Control Inputs Can Be Driven by TTL or

5-V/3.3-V CMOS Outputs

•

•

Latch-Up Performance Exceeds 100 mA Per

JESD 78, Class II

•

ESD Performance Tested Per JESD 22

–

2000-V Human Body Model

(A114-B, Class II)

–

1000-V Charged-Device Model (C101)

•

Supports Both Digital and Analog Applications:

USB Interface, Differential Signal Interface,

(1)

For additional information regarding the performance

characteristics of the CB3Q family, refer to the TI application

report, CBT-C, CB3T, and CB3Q Signal-Switch Families,

SCDA008.

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.