MC14521BFG

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The MC14521BFG is a programmable 12-stage binary counter flip-flop/divider/shift register chip providing a convenient means for binary division, frequency division, generation of modulo output signals, recirculation, or shifting. As a binary counter, the MC14521BFG can count up to 1,048,575, or in hexadecimal values ranging from 0 to FFFFF. As a frequency divider, the device can divide by any number between 2 and 1,048,576. It can also be used as a modulo N divider using the programming feature to only count certain states while ignoring all others.

The application field of the MC14521BFG can be divided in two main categories: data transmission and frequency division. In data transmission it is used in a wide variety of synchronous systems to convert a pulse train of logic high and low levels into parallel or serial binary code. This device can act as a frequency divider, recirculating the incoming data and passing the data to the output after counting successive pulses. It can also be used in non-synchronous systems to count pulses and provide a modulo-N output from an input pulse of a single frequency.

The working principle of the MC14521BFG is based on a four-stage flip-flop. This flip-flop is based on a four-bit counter and the counter counts in a linear sequence. When the reset line is low, the counter is reset to zero. On the first rising clock edge, the counter starts counting and on each succeeding rising clock edge the counter advances one count. When the counter count reaches a certain number (denoted n in the divider register), the output c is set high. This output c can be used as the output of the divider. When the reset line is brought back high, the counter resets to zero and counting starts again.

The MC14521BFG has various features that make it suitable for use in many applications. The reset input allows the device to be reset in the middle of a count cycle. The serial output option allows the device to shift out data to other devices. The programming features allow the device to be programmed to count only certain binary states or frequencies. The device also has two voltage levels, power good and power bad, which provide fault detection. Finally, the device contains a switch for controlling the clock source and is also available in a variety of package types.

In summary, the MC14521BFG can be used for a wide variety of frequency division, dividing and data transmission applications. The device is easy to program and has various features that make it suitable for a wide range of applications. The device is available in many packages and has the added feature of fault detection.

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