PCA9508DP,118 Integrated Circuits (ICs)

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The PCA9508DP,118 is a device designed to be used as an interface between logic devices outputting 8-bit data and devices receiving the same data. In this way it acts as a Signal buffer, repeater, and splitter, allowing the data input to be buffered, repeated and split out to the receiving devices accordingly.

It is a high speed, low power device which operates across a range of voltages, including 1.8v and 3.3v. It supports speeds of up to 5.2 MHz at 3.3v, making it a versatile and efficient device for many applications.

This device has a range of features and functions, which are important to consider when assessing its suitability for a particular application.

Features & Functions

• Can be used as a 5-bit input / 3-bit output signal buffer, repeater and splitter, with data selection controlled via a 5-bit control word.
• Uses a select control to disconnect data lines from the output to allow safe, gradual ramping up or down of the data rate.
• Inputs are 1.8V or 3.3V and will support speeds of up to 5.2 MHz at 3.3V.
• Switchable input / output levels allow support for HTL and CMOS logic.
• Outputs can be directly shorted together for applications requiring bus expansion.
• A dedicated power-down control is supported, allowing the device to be turned off when not in use to reduce power consumption.
• The device is packaged in a TSSOP-16 package, providing a small footprint without sacrificing performance.

Application Fields

The PCA9508DP,118 can be used in a range of applications requiring data buffering, repeating, and splitting. It can be used to convert a signal of one voltage level (for example, 3.3V) to another (such as 5V) and to buffer a signal to distribute it to multiple outputs. It also supports power-down control, allowing it to be powered down when not in use to increase its energy efficiency.

Examples of applications for this device include high speed bus communication, such as USB and HD video, as well as data switching in digital signal processing and motor control applications. Which require the low power, high speed, and reliability of this device.

Working Principle

This device takes input signals from 8-bits of data in the form of a Control Word. This control word is then used to control the data selection and to perform request-acknowledge communication. The selection is done by taking the 5-bit Control Word and using the 5-bit data selector to connect the 5 most significant bits of the Control Word to any of the 8-data input lines. The remaining 3-bits of the Control Word can be used to select between the 8-data input lines and the 3-output data lines, the output data lines being constantly multiplexed from the 8-data input lines.

The data selector can also be used to disconnect any of the 8-data input lines from the output, by selecting the disconnect option. This function allows for safe ramping up and down of the data rate by turning on and off different parts of the bus as necessary.

The device also supports a dedicated power-down control, which can be used to turn the device off when not in use, reducing its power consumption.

Conclusion

The PCA9508DP,118 is an 8-bit interface device, designed to act as a signal buffer, repeater, and splitter between devices using 8 bits of data. Its features and functions make it an efficient, versatile device well-suited for a range of applications, including high speed bus communication, data switching, and motor control.

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