HEF4557BT,653

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Logic shift registers are digital memory elements widely used in various applications for different purposes. Among them, the HEF4557BT,653 is a register that offers an ideal combination of features for both control and data acquisition applications. It belongs to the series of product family HEF4557BT and features an 8-bit register with 3-state TTL outputs, a maximum operating frequency of 100MHz, an input clock frequency range spanning from 0 to 33.3MHz, an output enable/disable feature, and a built-in waveform shifter.

The clock input of the register is asynchronous and can accept frequencies ranging from 0 to 33.3MHz. Once the clock has been activated, the register works by sequentially shifting in the inputs present at its input ports. The data is shifted either towards the left or right, according to the direction specified by the user. On each clock cycle, the corresponding input data is fed into the register after the shift operation is concluded on the current contents of the register.

The output of the register can be used directly as data link interface (DLI) in various digital systems. In particular, when the output enable is set to high, the output of the register will be in the high state if a 1 is present in the corresponding shift register bit location, and in the low state if a 0 is present. The output can also be used as an input signal when using the DLI as a source of data. When the output enable is set to low, the output of the register will be in a high impedance state, allowing the signal to be shared without the need of additional buffers.

The HEF4557BT,653 shift register can also be used in applications requiring the generation of one-of-many waveforms. Here, the circuit takes a single clock cycle to shift the inputs present at its input ports, and then produces an output waveform according to the data pattern stored in the register. This feature is especially advantageous in applications such as pulse width modulation, or in scenarios where a single clock cycle is sufficient to retrieve the desired result.

Overall, the HEF4557BT,653 shift register is an ideal choice for a wide variety of control systems and data acquisition applications. By combining the features of an 8-bit register, a 3-state TTL output, a maximum operating frequency of 100MHz, an input clock frequency range spanning from 0 to 33.3MHz, an output enable/disable, and a built-in waveform shifter, it providesthe user with immense flexibility in a wide range of scenarios.

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