MC74AC245MG

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The MC74AC245MG is an 8-bit buffer/line driver designed to operate from a single 5V power supply. It is designed to transmit data and addresses over an 8-bit bus. It is part of the AC family of devices – which are buffered logic devices with full output drive for applications requiring high quality, high speed, and low-power consumption. This device is most often used to interface between low-speed logic and high-speed memories.

Application Field

The MC74AC245MG is a high-speed 8-bit buffered transceiver for TTL or 5V logic applications. It enables high throughput operation of memory systems and other logic independent applications. By providing both high-impedance input/output (I/O) isolation and significant voltage improvement, this device eliminates multiple I/O levels present in microprocessor systems. It also helps reduce power consumption and noise susceptibility in digital systems. As such, it is typically used in computer applications, cellular phones, and data communication systems.

Working Principle

The MC74AC245MG utilizes bi-directional input/output buffers to divide the two data paths into two 8-bit channels. Each channel is divided into four output drivers, two input receivers, and two tri-state buffer control signals. The outputs are designed to drive low impedance loads, while the inputs are designed to be driven with TTL levels. The outputs are actively held high or low when the buffer control inputs (A or B) are high, and are placed in a high impedance state when the buffer control signals are low. This allows the device to be used for interface switching or for demultiplexing applications.

The high current driver (HCD) is designed to run at higher speeds when driving high capacitive loads, allowing for faster operation. The driver will actively sink and source up to 20 mA, allowing for higher speed operation. Additionally, the outputs can be disabled by a single enable (EN1) pin. This creates low power consumption, as well as allows for simple address decoding and data control.

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