SN74CBT3253CDBR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

SN74CBT3253CDBR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SN74CBT3253CDBR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。

FEATURES

· SN74CBT3253C Functionally Identical to

Industry-Standard ’3253 Function

· Undershoot Protection for Off-Isolation on A

and B Ports up to –2 V

· Bidirectional Data Flow, With Near-Zero

Propagation Delay

· Low ON-State Resistance (ron) Characteristics

(ron = 3 W Typical)

· Low Input/Output Capacitance Minimizes

Loading and Signal Distortion

(Cio(OFF) = 5.5 pF Typical)

· Data and Control Inputs Provide Undershoot

Clamp Diodes

· Low Power Consumption (ICC = 3 mA Max)

· VCC Operating Range From 4 V to 5.5 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

· 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 I2C Bus Expansion

· Supports Both Digital and Analog

Applications: USB Interface, Bus Isolation,

Low-Distortion Signal Gating

DESCRIPTION/ORDERING INFORMATION

The SN74CBT3253C is a high-speed TTL-compatible FET multiplexer/demultiplexer with low ON-state

resistance (ron), allowing for minimal propagation delay. Active Undershoot-Protection Circuitry on the A and B

ports of the SN74CBT3253C provides protection for undershoot up to –2 V by sensing an undershoot event and

ensuring that the switch remains in the proper OFF state.

The SN74CBT3253C is organized as two 1-of-4 multiplexer/demultiplexers with separate output-enable (1OE,

2OE) inputs. The select (S0, S1) inputs control the data path of each multiplexer/demultiplexer. When OE is low,

the associated multiplexer/demultiplexer is enabled, and the A port is connected to the B port, allowing

bidirectional data flow between ports. When OE is high, the associated multiplexer/demultiplexer is disabled, and

a high-impedance state exists between the A and B ports.

This device is fully specified for partial-power-down applications using Ioff. The Ioff feature ensures that damaging

current will not 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 VCC through a pullup

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.