CD74AC245M

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The CD74AC245M is one of a wide range of logic - buffers, drivers, receivers, transceivers manufactured as part of the commercial AC245M/A family of integrated circuits. This device combines the features of an 8-Bit D-Type bus transceiver, with the addition of nine OR gates arranged in a three-level hierarchical ORing structure.

Application Field

The CD74AC245M is used in a variety of applications. This device is ideal for applications requiring the implementation of TTL-compatible logic networks with a low power requirement. The built-in 15 V supply coupled with the TTL-compatible logic levels make the device suitable for both high-speed or low-power applications. The OR gates provide efficient logic-level translation as well as OR-AND logic combining.

The CD74AC245M is also used in data communications applications. Examples include implementing multi-level bus systems, forming low overhead 2-wire bus systems, and implementing communication networks. In the communications context, this device is versatile enough to be used to interface with a variety of devices, from serial port technologies (such as RS232, RS422, and RS485) to SPI and I2C.

Working Principle

The CD74AC245M is designed to provide logic-level translation between two high-speed, low-power 8-bit devices. It contains eight independent non-inverting buffer/level-translators together with a Hierarchical OR-gate structure consisting of nine interconnected OR-gates. The buffers are enabled via the OE pin and the output transistor within each buffer is typically enabled when the OUTPUT Enable (OE) pin is driven LOW. The buffers within this device have a fan-out of 8 TTL loads.

The OR-gate portion of this device is configured as three levels of OR gates. Ultimately, this is used to provide an ORing of the output of all eight input buffers. The ORing is achieved by internal busing and is used to drive the HEXA-OR output. This is available to provide an overall answer in types of cases where multiple devices need to drive the same line simultaneously and/or one needs to detect a conflict amongst multiple devices driving the same line.

The CD74AC245M is designed to provide logic-level translation between two high-speed, low-power 8-bit devices and it\'s suitable for both high-speed or low-power applications. This device is commonly used in data communications applications, such as implementing multi-level bus systems, forming low overhead 2-wire bus systems and implementing communication networks.

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