TCA9545A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

TCA9545A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TCA9545A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

1. 1-of-4 Bidirectional translating switches

. I2C bus and SMBus compatible

. Four active-low interrupt inputs

. Active-low interrupt output

. Active-low reset input

. Two address terminals, allowing up to four

devices on the I2C bus

. Channel selection via I2C bus, in any combination

. Power-up with all switch channels deselected

. Low RON switches

. Allows voltage-level translation between 1.8-V,

2.5-V, 3.3-V, and 5-V buses

. No glitch on power-up

. Supports hot insertion

. Low standby current

. Operating power-supply voltage range of

1.65 V to 5.5 V

. 5.5 V Tolerant inputs

. 0 to 400-kHz Clock frequency

. Latch-Up performance exceeds 100 mA per JESD

78

. ESD Protection exceeds JESD 22

. 4000-V Human-body model (A114-A)

. 1500-V Charged-device model (C101)

2 Applications

. Servers

. Routers (telecom switching equipment)

. Factory automation

. Products with I2C slave address conflicts (e.g.

multiple, identical temp sensors)

3 Description

The TCA9545A is a quad bidirectional translating

switch controlled via the I2C bus. The SCL/SDA

upstream pair fans out to four downstream pairs, or

channels. Any individual SCn/SDn channel or

combination of channels can be selected, determined

by the contents of the programmable control register.

Four interrupt inputs (INT3.INT0), one for each of the

downstream pairs, are provided. One interrupt (INT)

output acts as an AND of the four interrupt inputs.

An active-low reset (RESET) input allows the

TCA9545A to recover from a situation in which one of

the downstream I2C buses is stuck in a low state.

Pulling RESET low resets the I2C state machine and

causes all the channels to be deselected, as does the

internal power-on reset function.

The pass gates of the switches are constructed such

that the VCC terminal can be used to limit the

maximum high voltage, which will be passed by the

TCA9545A. This allows the use of different bus

voltages on each pair, so that 1.8-V, 2.5-V, or 3.3-V

parts can communicate with 5-V parts, without any

additional protection. External pull-up resistors pull

the bus up to the desired voltage level for each

channel. All I/O terminals are 5.5 V tolerant.