74FCT245ATPGG8

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The 74FCT245ATPGG8 is a member of the FCT family of highspeed interface drivers. It is a 24-bit to 8-bit transceiver designed to provide high performance logic-level translation. It is used in logic-levels conversions between different logic families, such as CMOS to TTL. It allows logic states that are un-matched in logic families to be mutually translated, making it very convenient in implementing mixed logic systems.

Application Field

The 74FCT245ATPGG8 transceivers are ideal for implementing bidirectional data bus interface applications. With its bus-hold circuitry, these transceivers provide the capability of maintaining valid outputs when the input data port is in a high impedance state. It is especially useful for interfacing with slow memories, latches, and analog input/output circuits. Furthermore, these transceivers may also be used in applications where autobauding is required. In addition to bidirectional data buses, the open-collector output also enables the implementation of bus-oriented communication systems.

Working Principle

The 74FCT245ATPGG8 data transceiver is designed to provide an interface between two different logic families. It consists of two bidirectional shift registers, a bidirectional bus-hold circuitry, and an 8-bit output port. The bidirectional shift registers consist of eight flip-flops, each latched by one single-control bit. A write cycle will latch data present in the data lines, while a read cycle will transfer data out of the shift registers.

The output port is an open-collector port which will allow bus-oriented communication systems to be implemented. The bus-hold circuitry is a bus-oriented interface based on flip-flop circuits that transfers data from one logic family to another. When the input data port is in a high impedance state, the bus-hold circuits will maintain the valid outputs.

The 74FCT245ATPGG8 data transceiver is extremely versatile, allowing for different logic families to be easily interfaced in a wide variety of applications. With its high speed, low power consumption, and extremely versatile capabilities, the 74FCT245ATPGG8 is an ideal choice for high performance logic-level translation.

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