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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.

SN74CB3Q3257

SCDS135D – SEPTEMBER 2003 – REVISED JULY 2018

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

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

(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 Features

• High-Bandwidth Data Path

(up to 500 MHz)

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

Powered Down

• Low and Flat ON-State Resistance (ron)

Characteristics Over Operating Range

(ron= 4 Typical)Ω

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

– 0- to 5-V Switching With 3.3-V VCC

– 0- to 3.3-V Switching With 2.5-V VCC

• Bidirectional Data Flow With Near-Zero

Propagation Delay

• Low Input and Output Capacitance Minimizes

Loading and Signal Distortion

(Cio(OFF) = 3.5 pF Typical)

• Fast Switching Frequency (f OE = 20 MHz

Maximum)

• Data and Control Inputs Provide Undershoot

Clamp Diodes

• Low Power Consumption

(ICC = 0.7 mA Typical)

• VCC Operating Range From 2.3 V to 3.6 V

• 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

• Io Supports Partial-Power-Down Mode Operation

• 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, Dierential Signal Interface,

Bus Isolation, Low-Distortion Signal Gating (1)

2 Applications

• IP Phones: Wired and Wireless

• Optical Modules

• Optical Networking: Video Over Fiber and EPON

• Private Branch Exchange (PBX)

• WiMAX and Wireless Infrastructure Equipment

3 Description

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 at

ON-state resistance (ron).

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)

SN74CB3Q3257DGV TVSOP (16) 3.60 mm × 4.40 mm

SN74CB3Q3257DBQ SSOP (16) 4.90 mm × 3.90 mm

SN74CB3Q3257PW TSSOP (16) 5.00 mm × 4.40 mm

SN74CB3Q3257RGY VQFN (16) 4.00 mm × 3.50 mm

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

the end of the data sheet.

Logic Diagram (Positive Logic)

SN74CB3Q3257

SCDS135D – SEPTEMBER 2003 – REVISED JULY 2018

www.ti.com

Product Folder Links: SN74CB3Q3257

Table of Contents

1 Features .................................................................. 1

2 Applications ........................................................... 1

3 Description ............................................................. 1

4 Revision History..................................................... 2

5 Pin Conguration and Functions ......................... 3

6 Specications......................................................... 4

6.1 Absolute Maximum Ratings ...................................... 4

6.2 ESD Ratings.............................................................. 4

6.3 Recommended Operating Conditions....................... 4

6.4 Thermal Information.................................................. 5

6.5 Electrical Characteristics .......................................... 5

6.6 Switching Characteristics, VCC = 2.5 V ..................... 6

6.7 Switching Characteristics, VCC = 3.3 V ..................... 6

6.8 Typical Characteristics.............................................. 6

7 Parameter Measurement Information .................. 7

8 Detailed Description .............................................. 8

8.1 Overview ................................................................... 8

8.2 Functional Block Diagram ......................................... 9

8.3 Feature Description................................................... 9

8.4 Device Functional Modes.......................................... 9

9 Application and Implementation ........................ 10

9.1 Application Information............................................ 10

9.2 Typical Application ................................................. 10

10 Power Supply Recommendations ..................... 11

11 Layout................................................................... 11

11.1 Layout Guidelines ................................................. 11

11.2 Layout Example .................................................... 11

12 Device and Documentation Support ................. 12

12.1 Documentation Support ........................................ 12

12.2 Receiving Notication of Documentation Updates 12

12.3 Community Resources.......................................... 12

12.4 Trademarks ........................................................... 12

12.5 Electrostatic Discharge Caution............................ 12

12.6 Glossary ................................................................ 12

13 Mechanical, Packaging, and Orderable

Information ........................................................... 12

4 Revision History

Changes from Revision C (April 2017) to Revision D Page

• Changed the pinout images appearance .............................................................................................................................. 3

• Added table values ...............................................................................................................................Thermal Information 5

Changes from Revision B (June 2015) to Revision C Page

• Added MAX values for TA= –40°C to 105°C to the table..............................................................Electrical Characteristics 5

• Added MAX values for TA= –40°C to 105°C to the Switching Characteristics, V

CC = 2.5 V table. ...................................... 6

• Added separate Switching Characteristics, VCC = 3.3 V for VCC = 3.3 V ± 0.3 V. Added TYP values and MAX values

for TA= –40°C to 105°C ......................................................................................................................................................... 6

Changes from Revision A (November 2003) to Revision B Page

• Removed table. ....................................................................................................................................Ordering Information 1

• Added table, section, table,Device Information Pin Conguration and Functions ESD Ratings Feature Description

section, , section,Device Functional Modes Application and Implementation Power Supply Recommendations

section, section, section, andLayout Device and Documentation Support Mechanical, Packaging, and Orderable

Information section ................................................................................................................................................................ 1