SN74LS648NT

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SN74LS648NT is an 8-bit bus transceiver used to interface two buses, designed and developed by Texas Instruments. The transceiver circuit consists of two separate eight-bit buffers, an A buffer and a B buffer, making it possible to interface two buses at the same time. The SN74LS648NT is a high-performance, low-power CMOS TTL device. It has low static and dynamic power consumption, and operates from a single power supply of 2.5V to 15V. The SN74LS648NT is a multi-buffers general purpose logic circuit; it is capable of operating as both a buffer and a line driver. It can be used for logic interfacing and as an I/O port expander in microprocessor systems.

The SN74LS648NT consists of 8-bit data buffers, a bidirectional bus buffer and an active bus-hold circuit for each of the two hard-wired buses. The input/output structures of the buffers are designed to accommodate various logic families, making them compatible with advanced logic families such as ECLs, TTLs and HCTs. The bus buffers use buffered inputs and can be used as a line driver or as a low-impedance buffer.

The SN74LS648NT has a working principle that allows it to alternatively buffer data in two directions between two buses. The device has a number of features, including output enable, output disable, and high-impedance state. The output enable feature is enabled when the output enable (OE) pin is asserted. When the output enable pin is de-asserted, all the output pins of the bus buffer change to the high-impedance state, thus allowing the input pins of the buffers to be accessed. The other feature of the device, the output disable feature, is enabled when the output disable (OD) pin is asserted. When the output disable pin is de-asserted, all the output pins of the bus buffer are de-asserted, thus forcing the bus to a low logic level.

The SN74LS648NT is mainly used in data and address buses, where the circuitry is not subject to noise, external voltage transients and power supply noise. The device features an optional active bus-hold circuit, which keeps the bus in a driven state, while no data is passing through the bus. This feature acts as a bus strobe, keeping the bus valid until new data is written to the bus. The transceiver is suitable for use in applications such as input/output port Expansion, peripheral controller buses and computer interfaces where multiple logic families and control functions are used.

In summary, the SN74LS648NT is an 8-bit bus transceiver used to interface two different buses, with features such as an active bus-hold, output enable and output disable circuits. Furthermore, it is also capable of operating with different logic families, which makes it suitable for applications such as input/output port expansion, peripheral controller buses and computer interfaces.

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