DM74AS245N

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The DM74AS245N is a quad bus transceiver designed for use in bus oriented systems. It is particularly suitable for use in multiplexed data systems to provide true data transmission from the sending to the receiving device. Applications include 4-bit microprocessors, memory systems, I/O systems, serial communications and data buses.

The device is designed to provide a buffer action between the sending and receiving device and operates from a single power supply ranging from 4.5 V to 5.5 V. Each bus line is composed of a TTL-level input terminal (DI) and complementary output terminal (DO). The maximum loading is 25 TTL loads per trench. The DM74AS245N is used to interface between two sets of devices operating over different bus architectures, e.g. TTL to TTL, TTL to ECL, ECL to ECL, etc.

The DM74AS245N has four data input lines (DI0-DI3), four data output lines (DO0-DO3), four enable inputs (OE0-OE3), four shipping control inputs (SC0-SC3) and four spacing control inputs (EC0-EC3). Inputs DI0-DI3 buffer data from the sender where the enable inputs OE0-OE3 enable data transmission through DO0-DO3. The shipping control inputs SC0-SC3 are used to initialize the data output on the bus. The spacing control inputs EC0-EC3 enable the data outputs to be released for the next bit and to avoid data runaway. The DM74AS245N is an active low device, meaning all control inputs must be low for data transmission.

The working principle of the DM74AS245N is fairly straightforward: it buffers and routes data from the sending device to the receiving device. Data is sent from the sending device to the DI0-DI3 inputs and is enabled by the OE0-OE3 control inputs. When enabled, the data is output to the DO0-DO3 outputs and is ready to be read by the receiving device. The SC0-SC3 inputs are used to initialize the data outputs when the bus is first powered up. The EC0-EC3 inputs are used to release the data outputs for the next bit to ensure accurate data transmission.

In summary, the DM74AS245N is a quad bus transceiver designed for multiplexed data transmissions from the sending to the receiving device. It is composed of four data input lines, four data output lines, four enable inputs, four shipping control inputs and four spacing control inputs and operates from a single power supply ranging from 4.5 V to 5.5 V. It provides a buffer action between the sending and receiving device and is used to interface between two sets of devices operating over different bus architectures, e.g. TTL to TTL, TTL to ECL, ECL to ECL. The working principle of the DM74AS245N is to buffer and route data from the sending device to the receiving device.

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