PCA9517集成电路（IC）的信号缓冲器、中继器、分离器规格书PDF中文资料

PCA9517属于集成电路（IC）的信号缓冲器、中继器、分离器。由美国德州仪器公司制造生产的PCA9517信号缓冲器、中继器、分离器信号缓冲器、中继器和分离器系列中的产品适用于远距离电气互连或电缆系统的数字信息传输。所有实际互连系统都具有非理想特性，该系列产品主要用于解决数字信息传输过程中因此造成的模拟问题。此外，还有其他功能，例如不同物理接口样式之间的转换和多路复用。

1 Features

1• Two-Channel Bidirectional Buffer

• I2C Bus and SMBus Compatible

• Operating Supply Voltage Range of 0.9 V to 5.5 V

on A Side

• Operating Supply Voltage Range of 2.7 V to 5.5 V

on B Side

• Voltage-Level Translation From 0.9 V to 5.5 V and

2.7 V to 5.5 V

• Footprint and Function Replacement for

PCA9515A

• Active-High Repeater-Enable Input

• Open-Drain I2C I/O

• 5.5-V Tolerant I2C and Enable Input Support

Mixed-Mode Signal Operation

• Lockup-Free Operation

• Accommodates Standard Mode and Fast Mode

I2C Devices and Multiple Masters

• Powered-Off High-Impedance I2C Pins

• 400-kHz Fast I2C Bus

• Latch-Up Performance Exceeds 100 mA Per

JESD 78, Class II

• ESD Protection Exceeds JESD 22

– 2000-V Human-Body Model (A114-A)

– 200-V Machine Model (A115-A)

– 1000-V Charged-Device Model (C101)

2 Description

This dual bidirectional I2C buffer is operational at

2.7 V to 5.5 V.

The PCA9517 is a BiCMOS integrated circuit

intended for I2C bus and SMBus systems. It can also provide bidirectional voltage-level translation (up-

translation/down-translation) between low voltages

(down to 0.9 V) and higher voltages (2.7 V to 5.5 V)

in mixed-mode applications. This device enables I2C

and similar bus systems to be extended, without

degradation of performance even during level shifting.

The PCA9517 buffers both the serial data (SDA) and

the serial clock (SCL) signals on the I2C bus, thus

allowing two buses of 400-pF bus capacitance to be connected in an I2C application. This device can also

be used to isolate two halves of a bus for voltage and

capacitance.

The PCA9517 has two types of drivers—A-side

drivers and B-side drivers. All inputs and I/Os are

overvoltage tolerant to 5.5 V, even when the device is

unpowered (VCCB and/or VCCA = 0 V).

The PCA9517 doesnot support clock stretching and

arbitration across the repeater.