74HC640N,652

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The 74HC640N and 74HC652 are manufactured by NXP Semiconductors. They are part of the 74HC series of digital logic buffers, drivers, receivers, transceivers and related devices that use advanced silicon-gate CMOS technology. The 74HC640N and 74HC652 offer improved performance over comparable TTL devices in terms of power consumption, speed, and input/output characteristics.

The 74HC640N is a single 8-bit register with three-state outputs. It is similar to the TTL 7474 flip-flop, but with enhanced functionality. It has two binary inputs (D and A), two active-low enable inputs (EN1 and EN2), a single clock input (CLK) and eight active-low outputs (Q0 – Q7). The EN1 and EN2 enable inputs control the transfer of data when CLK is high. Whenever CLK is low, the output behaves as a three-state buffer, which can be disabled by both EN1 and EN2.

The 74HC652 is a transition edge-triggered register with two inputs and four outputs. It has two binary inputs (D and A), two four-bit binary outputs (Q0 – Q3), a single clock input (CLK) and two active-low enable inputs (EN1 and EN2). The EN1 and EN2 enable inputs control the transfer of data when CLK is high. Whenever CLK is low, the output behaves as a three-state buffer, which can be disabled by both EN1 and EN2.

The 74HC640N and 74HC652 offer the following applications:

• they are ideal for converting data from a single register to multiple, three-state outputs;
• they are suitable for applications requiring data stored in memory such as programmable logic controllers;
• they can be used for multiplexers, shift registers, and for data transmission;
• they are suitable for applications such as SMBus, I2C, USB and I2S;
• they are suitable for synchronous data rate conversions;
• they are used as part of state machines, microprocessors and microcontrollers;
• they are used for data logging and sequential logic applications; and
• they are used as digital logic buffers, drivers and receivers.

The working principle of the 74HC640N and the 74HC652 is essentially the same; these devices store binary data in a memory location and, depending on the status of their enable inputs, transfer it to their output. When the clock signal on their correspondinginput is active and the enable inputs are enabled, the data on the inputs is transferred to the memory location and is then available on their outputs. The data on the inputs is re-transferred to the memory location whenever the clock signal transitions from low-to-high.

The 74HC640N and 74HC652 are well-designed and suitable for a wide range of applications. They offer improved performance over comparable TTL devices in terms of power consumption, speed, and input/output characteristics. Moreover, their ease of use makes them a great choice for embedded systems, microcontroller systems and other digital logic applications.

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