SN74HCT125DRE4

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The SN74HCT125DRE4 is one of TI’s newest logic devices. It is a quad digital buffer with 3-state outputs designed to provide high speed operation in low power, digital CMOS and TTL systems. The SN74HCT125DRE4 is mainly used in high speed and low power digital CMOS and TTL systems, and as part of analog circuitry such as data/address bus transceivers.

Application Field

The SN74HCT125DRE4 is mainly used in high speed, low power digital CMOS and TTL systems and as part of analog circuitry such as data/address bus transceivers. It is also used in advanced systems such as computer memory and advanced or mixed signal applications. The SN74HCT125DRE4 is also suitable for use in applications involving high speed buses, buffering, and/or line drivers.

The two primary application areas of the SN74HCT125DRE4 are:

• Data bus transceivers
• Line drivers/buffers

Working Principle

The SN74HCT125DRE4 is a quad digital buffer with 3-state outputs designed to provide high speed operation in low power, digital CMOS and TTL systems. It is composed of eight sections including an output enable (OE) and four independent buffers. The buffering function makes the device more suitable for driving common bus lines in a digital system.

The SN74HCT125DRE4 operates from the VSS to VCC supply voltage range of 2 to 6 volts. At lower supply voltages, the SN74HCT125DRE4 behaves as a low power analog device and consumes only 10 µA of quiescent current. In addition, it features low output impedance and high sink current capability, allowing it to drive up to 6 TTL loads.

The SN74HCT125DRE4 has two logic level inputs: active-low (A) and active-high (Y). When the enable input is asserted to a high logic level, the outputs follow the logic levels of the corresponding inputs. When the enable input is pulled low, the outputs are put in the high impedance state regardless of the logic levels of the inputs.

When both enable and the enable bar are asserted to a high logic level, the device operates as an inverter. This can be more useful in some applications such as level-translation, bus line protection, and advanced low power systems.

The SN74HCT125DRE4 is also capable of running with higher frequencies such as 16MHz, which is beneficial for applications requiring high speed digital communication.

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