CD4520BNSR

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The CD4520BNSR is an 8-bit addressable divider with a synchronous reset and lockup-free design. It is an ideal choice for applications where an asynchronous reset is not feasible, such as a multi-cycle timer, clock tree applications, motor control systems, and other time-critical applications. It is made up of four 8-bit addressable latches and two 8-bit addressable dividers with reset. Its application field and working principle are discussed here.

The CD4520BNSR is most commonly used in clock tree management applications. It is capable of taking a single high-frequency input and dividing it by two or more to produce several outputs of different frequencies—all without the need for complicated programming. This ability is especially useful in applications such as digital signal processors (DSPs) and clock-enabled system architectures. By using the CD4520BNSR, these systems can obtain several outputs of different frequencies without having to waste precious hardware on programming.

CD4520BNSR can also be utilized for high-precision timing applications. The reset pin allows for the quick reset or start of the timer with minimal delay, making it ideal for applications that require precision timing. When used to control lighting or motor systems, the CD4520BNSR can provide a reliable and accurate delay to ensure that all operations are carried out in a timely manner. Additionally, its reset function also enables the CD4520BNSR to be used as a multi-cycle timer, ensuring that all events are completed within the predetermined time interval.

The CD4520BNSR works on a shift register principle, where data is shifted down the register one bit each time the clock triggers. When the bit reaches the last register, it’s compared to a clock reference counter (CRC) value, which is set before each shift. If the bits match, it means that the registers are full and the divider needs to count again. When the divider is full for the second time, a reset clock pulse is given that can be used to reset the divider. This reset pulse will also cause the synchronous reset bit (SRB) to go high. The SRB can then be used to reset the addressable latches.

The CD4520BNSR also features a lockup-free design, which prevents a corner case in which the divider stops resetting. This is accomplished through the use of a dual reset system, which adds a safety measure to ensure that the device continues to operate even after a Reset signal is issued. In the event of a "lock-up," the SRB will continue to keep outputting a high signal until the divider is reset manually or reset using the second Reset signal.

The CD4520BNSR is a powerful, reliable, and flexible addressable divider. It is ideal for applications that require high-precision timing, such as motor control systems, digital signal processors, and clock tree applications. It is also a great choice for those looking for an asynchronous reset alternative, such as a multi-cycle timer, as it offers a reset pulse and a lockup-free design to prevent corner cases.

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