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Logic - Buffers, Drivers, Receivers, Transceivers: 74ABT125CMTCX application field and working principle

The 74ABT125CMTCX is a high-speed Quad Buffer/Driver with non-inverting 3-state outputs and voltage translation capability. The 74ABT125CMTCX is designed for 2.5V and 3.3V VCC operation. The 74ABT125CMTCX is designed to be interfaced directly to TTL logic. The outputs can drive up to 10 LS-TTL loads.

Application

The 74ABT125CMTCX non-inverting 3-state buffers/drivers are specifically designed for applications requiring operating speed beyond 2000 Mbps including interfacing to high speed backplanes, normal bus interfacing in modular systems, memory systems, and high speed clocks. The 74ABT125CMTCX has separate outputs, which can be connected to form a single a bidirectional bus.

Features

• 2.5V and 3.3V VCC operation
• Low impedance output drivers
• 3-state outputs to simplify bus expansion
• Cleans the bus by forcing outputs to tri-state in the absence of a valid output
• Output rise and fall times are less than 8ns

Working principle

The 74ABT125CMTCX buffer/driver consists of four non-inverting buffers with 3-state outputs. Each output is controlled by an Output Enable (OE) input. In 3-state mode, the output is off and a high impedance state is present at the output. VCC and GND are the supply voltage pins and all other pins are the inputs and outputs. All inputs are protected from damage due to static discharge by diodes to VCC and GND. The OE inputs should not be left floating. The 74ABT125CMTCX can be connected to form a single bidirectional bus.

The 74ABT125CMTCX uses two-level active-high OE inputs. When OE is LOW, the data on the input will be present at the outputs. When OE is HIGH, the outputs are in high-impedance state and the data on the input pins is ignored. This makes it easier to expand the bus. In addition, the outputs of the 74ABT125CMTCX can be driven to any VIL level including those below VTT. This allows it to be interfaced to a variety of logic families.

Conclusion

The 74ABT125CMTCX is a high-speed Quad Buffer/Driver with non-inverting 3-state outputs and voltage translation capability. It is designed to be interfaced directly to TTL logic and can be connected to form a single bidirectional bus. The OE inputs makes it easy to expand the bus, and the outputs can be driven to any VIL level, making the 74ABT125CMTCX suitable for a variety of applications.

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