SN74LS90DRG4

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Logic - Counters, Dividers

The SN74LS90DRG4 is a four bit synchronous counter integrated circuit made by Texas Instruments. It is a member of the LS-TTL logic family, the most popular logic family in the 1970s and 1980s. The SN74LS90DRG4 is used in a wide range of applications, such as clocks, counters, timers, and dividers. This article will discuss the application field and working principle of the SN74LS90DRG4.

Application field: The SN74LS90DRG4 is a synchronous counter, which means that the inputs can be synchronized to an external clock signal. The counter can be used in a wide range of applications, such as clocks, counters, timers, and dividers. It can be used to divide and synchronize frequency, time, and counter signals. It can also be used to generate time delays and as an address decoder in memory systems.

Working principle: The SN74LS90DRG4 is a four bit synchronous counter. It has four data inputs, namely, A, B, C, and D, which are used to load the counter. The counter can be loaded either synchronously, using the CLOCK input, or asynchronously, using the PR input. The synchronous load operation adds one to the count. Each time the CLOCK signal transitions from low to high, the counter is incremented. If a PR transition to high occurs after a CLOCK transition, the counter is loaded with a value stored on the data inputs. The outputs of the counter are available on the Q0 to Q3 outputs. The outputs are active when the CLOCK signal is high. The CLOCK and PR signals can be generated from a variety of sources, such as a clock generator, oscillator circuit, or even a logic circuit.

The SN74LS90DRG4 is a versatile and simple to use counter and is used in many different applications. It is an ideal choice for applications requiring a low cost and low power synchronous counter.

In conclusion, the SN74LS90DRG4 is a four bit synchronous counter integrated circuit. It is versatile and easy to use, and is used in clocks, counter, timers, dividers, and other applications. It can be used to divide and synchronize frequency, time, and counter signals, and can be loaded either synchronously or asynchronously using the CLOCK and PR inputs.

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