CD74HC299M96 Integrated Circuits (ICs)

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The CD74HC299M96 is a quad universal bus transceiver with 3-state outputs and bus hold. It is designed expressly to provide improved bus-hold and quiet output glitch-free logical transitions. It is used in high-speed bus systems requiring bus reversal and level conversion. This device has two sets of 4-bit input/outputs (A and B) whose direction is controlled by two Mode Inputs. The four Mode Inputs can be used to control four separate 2-line to 4-line or 2-line to 2-line buses. Each direction control input (A and B) when LOW puts the associated buffer in the high-impedance state, and when HIGH, the associated buffer becomes active for transferring data. The direction control inputs (A and B) must be stable for the full propagation delay time of the device in certain applications. The lower level high-impedance input state of the Buffer translates the specified HIGH or LOW logic level output into the high-impedance state.

CD74HC299M96 logic devices are operating in a wide range of logic applications such as microprocessor/microcomputer based systems, busses with buffers, data switches, address translator, level translation and arbitration circuits, etc. The device is suitable for high speed and low power operation, providing improved bus-hold and quiet, glitch-free logical transitions and includes an input signal hold circuit that implements the bus-hold function. The device is capable of driving either two 16-bit bus, two 8-bit bus, two 4-bit buses, two 4-bit buses with two 2-bit buses, two 4-bit buses with four 2-bit buses, four 2-bit buses with two 2-bit buses, and four 2-bit buses with four 1-bit buses.

The working principle of the CD74HC299M96 is quite straightforward. The device acts as a transceiver between two buses and can transfer data in either direction. Further, each direction control input (A and B) when LOW puts the associated buffer in the high-impedance state, and when HIGH, the associated buffer becomes active for transferring data. The CD74HC299M96 utilizes differential level XOR or PASS logic for output. When the CD74HC 299M96 is used as a direct level translator, the BUS_HOLD function prevents unintentional data transfer when both buses stay at the same level. For two 8-bit buses, two 4-bit buses, two 4-bit buses with two 2-bit buses, two 4-bit buses

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