SN74CB3Q3305PWR集成电路（IC）的信号开关多路复用器解码器规格书PDF中文资料

SN74CB3Q3305PWR属于集成电路（IC）的信号开关多路复用器解码器。由德州仪器制造生产的SN74CB3Q3305PWR信号开关，多路复用器，解码器逻辑型信号开关、多路复用器和编码器 IC 可用于对以数字格式表示数据的电信号进行路由和选择。这些器件与设计用于模拟信号的类似产品有所不同，它们保留的信息表示为两个电状态之一，而不是两个外部界限内的无穷变化量。

1 Features

• 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 = 3 Ω typical)

• Supports input voltage beyond supply 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 or output capacitance minimizes loading

and signal distortion

(Cio(OFF) = 3.5 pF typical)

• Fast switching frequency (fOE = 20 MHz maximum)

• Data and control inputs provide undershoot clamp

diodes

• Low power consumption (ICC = 0.25 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, and 5 V)

• Control inputs can be driven by TTL or

5 V/3.3 V CMOS outputs

• Ioff supports partial-power-down mode operation

• Latch-up performance exceeds 100 mA per JESD

78, Class II

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

• USB, differential signal interface

• Bus isolation

3 Description

The SN74CB3Q3305 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 switching input voltage beyond

the supply on the data input/output (I/O) ports. The

device also features low data I/O capacitance to

minimize capacitive loading and signal distortion on

the data bus. Specifically designed to support highbandwidth

applications, the SN74CB3Q3305 device

provides an optimized interface solution ideally suited

for broadband communications, networking, and dataintensive

computing systems.

This device is fully specified for partial-power-down

applications using Ioff. The Ioff circuitry prevents

damaging current backflow through the device when

it is powered down. The device has isolation during

power off.

To ensure the high-impedance state during power up

or power down, OE should be tied to GND through a

pulldown resistor; the minimum value of the resistor

is determined by the current-sourcing capability of the

driver.