SN74HC645NSRE4

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The SN74HC645NSRE4 is a logic component that falls in one of the component categories of logic devices – Buffers, Drivers, Receivers, Transceivers. It belongs to the industry-leading HC logic family, and is based on the advanced CMOS silicon gate technology.

In terms of its application field, the SN74HC645NSRE4 is suitable for applications involving byte-wide synchronization, where the component is used to buffer and transfer data within data buses, among FIFO memories, between memories and registers etc. It also allows data to pass between asynchronous systems, as individual synchronous bytes, while providing a minimum of clock pulses to latches during data operations.

At the core, the SN74HC645NSRE4 component is a 8-bit configured shift register, built without the use of clocked flip flops. The device is usually cascaded with a FIFO, which might not be clocked so that data passing can be achieved without generating additional interrupts.

The working principle of the SN74HC645NSRE4 involves four interface pins and one enable pin, used to both load and shift data. The purpose of the enable pin is to activate the chip, by which the load/shift data regulation is achieved. The four interface pins namely I/O, DIN, D1, D2 are connected to each other in two ways. The D1 and D2 pins are connected to both the I/O and DIN pins, with D1 connected to DIN and D2 connected to I/O. Signals are sent from the Clock Pin in order to either interact with or read data from the device.

The SN74HC645NSRE4 is based on the HC logic family, where the -6 suffix indicates a voltage between 2 and 6 volts. Such a voltage range lets the device operate without additional components, as logic is compatible with the logic levels of a 3.3V device. At the same time, this device is also extremely power efficient, needing only 780 microWatts to work under typical conditions. On top of that, the SN74HC645NSRE4 is a low power device, dissipating less than 100 mW at 4.5V, only slightly more than twice that at 0.4V compared to static power mode.

As with other logic components, the SN74HC645NSRE4 is a great solution for data shifting applications, particularly if long distances are acceptable. The sturdy design is rather reliable, efficient and cost-effective in the long run when compared with other devices.

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