74HC4020D,652

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The 74HC4020D,652 is a member of the high-speed CMOS device family 7400. It is the most advanced and popular among the logic counters, dividers and multi-purpose shift registers. The chip contains twelve 14-stage ripple counters, latched input and output, an automatic power-up reset, and a built-in divider circuit. By cascading or an internal connection of various registers, a variety of functions such as division and frequency division can be realized. This article will discuss its application field and working principle.

1. Application field

The 74HC4020D,652 is widely used in a variety of applications. Among them, it can be used in clock frequency division and generation. The chip can be used to divide a given frequency by the presetting of 12-stage chain ripple counters, so as to generate a new lower frequency clock. Its peak detection capability can also be used in data acquisition systems, to capture information pulses with very high precision.

Moreover, 74HC4020D,652 can also be used in logic signals interval measuring, and measuring logic pulse width of a single pulse and sequence of pulses. Additionally, in computer systems, the device can be used as a pulse generator and delay line which means it can be used to produce successive delayed pulses and to count pulses.

2. Working principle

The 74HC4020D,652 consists of 12 ripple counters, which are cascade connected, forming a chain connected device. The output of one ripple counter is connected to the input of the next, so that only one clock can be used to refresh the entire chain. Inputs allow the reset, hold and data shifting enable, while the output is organized in parallel.

Under steady-state operating conditions, each internal register is shifted in parallel at the same time, under the control of the clock signal in the input. During the rising edge of the input clock, the data of all the latches will be simultaneously shifted one position right. The last known data in the chain can be read frpm the Q outputs.

The 74HC4020D,652 uses asynchronous reset, which means that the reset may be done at any time independently of the clock input. When doing an asynchronously reset, all latches in the device will be cleared and put into quiescent state. An external circuit can be used to uniquely input to the reset, hold and shift enable pins, in order to control the operation of the chip.

Conclusion

The 74HC4020D,652 chip belongs to the high-speed CMOS device family 7400 and is widely used in a variety of applications, primarily as a counter, divider or frequency divider. Its working principle is based on a 12-stage chain ripple counters, which can be reset asynchronously, allowing data to be shifted parallel under the control of the clock signal.

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