74HC4520D-Q100J

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The 74HC4520D-Q100J is a dual 4-bit binary counter and divide-by-24 counter from Texas Instruments. It is one of the family of Logic – Counters, Dividers, manufactured by the company and is built with High-Performance Silicon-Gate CMOS technology. As opposed to other logic series such as the 74ALS (Advanced Low-Power Schottky series) and 74F (Fast series), the 74HC are typically much faster and consume less power.

The 74HC4520D-Q100J has two independent 4-bit binary counters whose count sequence can be reset by a common Reset/Clear line. The counters also have separate Clock inputs, Set/Reset inputs, and Output Enables. The counters are also removable and are easily replaceable. The 74HC4520 chip has 8 outputs (A1 – A4 and B1 – B4) that can be used to produce a divide-by-24 output.

The 74HC4520D-Q100J finds wide application in systems that require asynchronous divide-by-24 counting and in digital systems used in security, automotive, communications, and audio/video applications. When used as asynchronous counters, the devices can perform counting up to 24 in sequence. The device can also be used to monitor the pulse rate of a system. In audio/video applications, the 74HC4520D-Q100J can be used to measure and control the frequency of the audio/video signals being sent and received.

The 74HC4520D-Q100J features a wide range of operating temperature (from -40°C to +85°C) and operates from 3.0V to 5.5V. Its supply current is low (400µA maximum at 5V) and it can be used with TTL, CMOS and PMOS logic. The clock frequency is adjustable, depending on the load capacitance. The input and output signals can have either positive or negative logic.

The working principle of the 74HC4520D-Q100 is based on its bipolar clock which drives an edge triggered flip-flop circuit. When an input signal is applied to the clock pin of the device, the flip-flop circuit triggers and creates a pulse at the “Count 0” output, while an inverted pulse is generated at the “Count 1” output. This sequence is repeated for each cycle of the clock until the count reaches 24. The sequence is reset by applying a logical “Reset” signal to the device.

In conclusion, the 74HC4520D-Q100J is a versatile binary counter and divide-by-24 logic device from Texas Instruments, which finds wide application in several digital systems. It is a high-performance device which has low power consumption and wide temperature operating range.

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