SN74CB3Q3253DBQR屬于集成電路（IC）的信號開關多路復用器解碼器。由美國德州儀器公司制造生產(chǎn)的SN74CB3Q3253DBQR信號開關，多路復用器，解碼器邏輯型信號開關、多路復用器和編碼器 IC 可用于對以數(shù)字格式表示數(shù)據(jù)的電信號進行路由和選擇。這些器件與設計用于模擬信號的類似產(chǎn)品有所不同，它們保留的信息表示為兩個電狀態(tài)之一，而不是兩個外部界限內(nèi)的無窮變化量。

1 Features

1? High-Bandwidth Data Path (Up to 500 MHz) (1)

? 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 Ω Typical)

? 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/Output Capacitance Minimizes Loading

and Signal Distortion (Cio(OFF) = 3.5 pF Typical)

? Fast Switching Frequency (fOE = 20 MHz Max)

? Data and Control Inputs Provide Undershoot

Clamp Diodes

? Low Power Consumption (ICC = 0.6 mA Typical)

? VCC Operating Range From 2.3 V to 3.6 V

? Data I/Os Support 0- to 5-V Signal 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 and

3.3-V CMOS Outputs

? Ioff 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, Differential Signal Interface Bus

Isolation, Low-Distortion Signal Gating

(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).

2 Applications

? Video Broadcasting: IP-Based Multi-Format

Transcoder

? Video Communications System

3 Description

The SN74CB3Q3253 device is a high-bandwidth FET

bus switch using a charge pump to elevate the gate

voltage of the pass transistor, providing a low and flat

ON-state resistance (ron). The low and flat ON-state

resistance allows for minimal propagation delay and

supports rail-to-rail switching on the data input and

output (I/O) ports.