M74HC393B1R

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The M74HC393B1R is a dual 4-bit binary synchronous counter. It is commonly used as a logic counter, divider, or frequency divider due to its wide range of capabilities. The device is well-suited for applications that frequently require precise control over the timing and the output response of a voltage-controlled oscillator, digital lock trigger, or digital lock state. In addition, it can also be used for fast counter designs and programmable changeable division ratios. When used with multiple external digital rate control inputs, the M74HC393B1R provides a versatile solution for synchronous counting, division, and division-ratio control. It also features synchronous reset and clear functions that are useful in logic-based applications.

The M74HC393B1R consists of two identical, individually programmable 4-bit binary counters. It is comprised of four NAND-gate multiplexers, each with two channels. Each channel provides a true (high) and complement (low) output. The device also includes a reset pin which, when activated, will reset both counters to their default state. The M74HC393B1R is a high-speed TTL logic counter and has the capability of operating up to 500MHz.

The M74HC393B1R operates by counting the number of pulses input to its two internal binary counters. When the prescribed number of pulses is counted, the M74HC393B1R will generate a high-logic signal on its output pin. This signal is then used as the trigger for the required action or task. For example, the M74HC393B1R can be used to control a voltage-controlled oscillator to alter the frequency of its output. Also, the device can be used in logic-level pulse counting applications, such as digital locks.

The M74HC393B1R offers a number of features to further enhance its usability. First, it allows for individual counter reset and synchronous count-reset pulses. This allows the ports to be reset and released in response to a single external signal. Additionally, the device includes an asynchronous clear function to reset both counters independently. This allows for greater control over the divider ratio and can be used to implement time-multiplexed operations, such as waveform generation.

Lastly, the M74HC393B1R includes four active-low individual outputs. These outputs can be used to indicate when a specific binary count has been reached. For example, the outputs can be used to indicate when a binary number has been multiplied, thereby allowing a microcontroller to initiate the operation. Likewise, these outputs can also be used to generate interrupts and can be programmed to trigger further actions.

In conclusion, the M74HC393B1R is a versatile, high-speed logic counter ideal for a variety of applications, such as synchronization, logic-level pulse counting, and waveform generation. It can be used to divide frequencies and produce a variety of signals. Its reset and synchronous inputs make it suitable for multi-cycle operation and its four active-low individual outputs allow for more accurate, controlled operation. The applications of the M74HC393B1R are highly varied and, as a result, it is a very useful and sought-after device in the logic counter, divider and frequency divider markets.

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