SN74LV540APW

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Introduced here is the SN74LV540APW, a Logic - Buffers, Drivers, Receivers, Transceivers IC, from Texas Instruments. The SN74LV540APW is a 3.3V CMOS Octal Buffer/Line Driver with 5V Tolerant Inputs and Open Drain Outputs. It is designed to provide bus matching for low voltage, high speed environments. The SN74LV540APW is characterized for operation over the full military temperature range of -55°C to 125°C.

Application Field

The SN74LV540APW is built to offer exact bus matching in low voltage, high speed systems. This chip required very low power and allows very low noise in operation. As such, the SN74LV540APW is ideal for all applications needing exact bus matching, such as DSPs, microprocessors, memories, disk drives, and communication systems. In addition, because it has 5V tolerant inputs, the SN74LV540APW can also be used for interfacing any 5V logic to a 3.3V bus.

Working Principle

The SN74LV540APW contains eight open drain outputs that can be used as a line driver and as a buffer. The 8 output buffers are controlled by three address lines A0, A1 and A2. In this chip, the address lines operate in pairs. The high logic levels on A1 and A2 will switch on the first four outputs OUT1-OUT4 while the low levels of A1 and A2 enable the second four outputs OUT5-OUT8. The SN74LV540APW has a single enable input (/OE) that can used to enable or disable all outputs. If the enable signal is high, all buffers will be enabled. If the enable signal is low, all buffers will be disabled and go into the high-impedance state.

The SN74LV540APW can be used in three different configurations to match the needs of different applications. For example, the device can be used as an 8-bit line driver with the enable signal functioning as an MUX control to switch between two 8-bit data. It can also be used as an 8-bit buffer/line driver with the enable signal functioning as an output enable. In this configuration, /OE determines the power state of the device. Finally, the device can be used as a 2-MUX 4-bit bi-directional bus by using the enable signal to switch the direction of the bus.

The SN74LV540APW has a high speed operation with outputs operating up to 100MHz on a 3.3V supply. Like other devices in the Texas Instruments logic family, the SN74LV540APW features low power consumption, a wide voltage range, and a high noise immunity level of 100mV.

Conclusion

The SN74LV540APW is a versatile, low voltage, high speed IC from Texas Instruments. It is ideal for applications that require high speed, low power, and accurate bus matching. The SN74LV540APW can be configured for use as an 8-bit line driver, an 8-bit buffer/line driver, or a 2-MUX 4-bit bus. Its flexibility and high performance make it a great choice for many applications.

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