SN74LVC245AGQNR

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The SN74LVC245AGQNR is an octal bus transceiver with 3-state outputs and is fabricated with quadruple-well process technology. The bus transceiver gives us control to change the databits direction from one bus to another. It is typically used to invert the input and drive the outputs at slightly higher current than the 74LVT family. The SN74LVC245AGQNR belongs to the Logic - Buffers, Drivers, Receivers, Transceivers family. In this article, we will discuss the application field and working principle of the SN74LVC245AGQNR.

The SN74LVC245AGQNR device is ideal for low-power memory and bus interfacing, or to perform microprocessor system bi-directional port expansion. It has an input leakage current of less than 30nA and a working voltage of 1.65V to 3.6V. It also features hot insertion and is suitable for bus-oriented applications, high-speed bi-directional data transfers, and port expander. The device comes in two different packages WQFN (4.4mmx2.2mm) and UDFN (2mmx2mm).

In terms of its working principle, the device is powered over two independent supplies and behaves like a latch-type buffer. It has the capability to work with asynchronous communications, allowing the data from one bus to be switched to another. Its connected systems include microprocessors, memories, FPGAs and ASICs in combination with peripheral ICs. The device also features two power management schemes, namely 82S and 98S, which control the power saving features.

Each bus receiver has an easy to operate OFF mode select Input (OMS). It can be used to place the device in low power mode of operation with minimal current consumption in the enabled states. This helps to conserve power while still being operational. The logic level thresholds of the OMS pin are compatible with many varieties of logic families, like PMOS, CMOS, TTL and HC families.

The device also has a High Impedance Enable Input (HIE) which helps to individualize the device\'s I/O pins. When HIE is active, both A and B buses will become high-impedance states, thus allowing the device to be left with only the Power on and OFF states. The SN74LVC245AGQNR is also featured with an Operating Mode Select (OMS), which helps to reduce the quiescent current of the supply. By selecting OMS for a particular mode, the device can be powered down to a reduced state, helping achieve savings in power consumption.

The SN74LVC245AGQNR is also specified with a Bus Hold feature, which helps maintain the logic state on the bus, even if the input goes to a high-impedance state. This feature is very useful when interfacing with a Bus Master. When a Master starts to write data to the bus, the bus drivers and receivers may switch to a high-impedance state. Bus Hold helps to keep the data valid on the bus for receivers to latch.

In conclusion, the SN74LVC245AGQNR is a perfect choice for low-power memory and bus interfacing with its low power consumption and excellent noise immunity. The device offers a range of useful features, which makes it ideal for use in many different applications. It is robust and reliable, so it is suitable for use in industrial and other safety-critical applications.

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