74ABT245CMTC

Logic - Buffers, Drivers, Receivers, Transceivers

74ABT245CMTC is a high-performance CMOS octal bus transceiver with non-inverting 3-STATE outputs and designed for 1.65 V to 5.5 V VCC operation. This device is designed for asynchronous two-way communication between data buses. The output-enable (OE\) input can be used to disable the device so that the bus-pins assume a high-impedance Off-state. 74ABT245CMTC is similar to 74ABT245BVTC. The ABT245 device receives data from a A-port and transmits to the B-port or vice versa depending on the logic level at the direction-control (DIR) input.

Application fields

The 74ABT245CMTC is primarily intended for use in bus-structured systems where most signals are carried on a common bus. It is applicable in a wide range of systems, such as a personal computer, file servers, workstations, routers, set-top boxes and receivers. 74ABT245CMTC provides an optimum solution to perform asynchronous, two-way data transfers over a common bus line. It is also useful in systems employing mixed-voltage bus architectures.

Working Principle

The Direction-control (DIR) input determines which direction the data will flow.When DIR = LOW, the 74ABT245CMTC transfers data from A-Port to B-Port.When DIR = HIGH, data flow is from B-Port to A-Port. When the Output-enable (OE\) input is LOW, all the outputs will be placed in the high-impedance OFF-state.Data is transferred to and from their respective ports on the LOW-to-HIGH transition of the Clock (CLK) input.At the end of the data transfer cycle (in either direction) all outputs will be in a defined high-impedance OFF-state. The device can interface with a bidirectional bus using an external enable input (or another transceiver) in conjunction with the output enable, as multiple devices can be enabled at any one time.

Conclusion

The 74ABT245CMTC is an octal bus transceiver designed to facilitate two-way asynchronous data transfers. It provides an optimum way to maximize the efficiency of data transfers and is suitable for a wide range of applications and systems. This device is useful in enabling mixed-voltage bus architectures, where a typical bus will mix the signals from 3.3 V, 2.5 V and 1.8 V sources.