CD74HC190E

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A CD74HC190E is a logic integrated circuit (IC) used for counting, timing and dividing applications. It is a decade counter with four synchronous stages and two preset terminations. It is also commonly referred to as a 9-stage ripple counter and also as a BCD counter. It is composed of two halves, each half of which includes an up/down counter and an associated decoder. The up/down counter counts in sequences of binary 1’s, 0’s and carries. The decoder captures the output of the counter and then interprets it as either binary coded decimal (BCD) or as decimal (i.e. 0-9). This versatile IC is widely used in various electronics industries and is particularly valuable when it comes to implementing various digital applications.

The application field of a CD74HC190E is in automotive engine gauges and controls, pulse measurements, digital machinery control, enable/disable manual motor controls, up/down motor and gear ratios, digital tachometers, digital speedometers and alarm modules. The device can also be used in a variety of embedded systems, such as digital to analog converters, microcontrollers, power supplies and test equipment.

The working principle of the CD74HC190E is as follows. The up/down counter contains two 4-bit synchronous UP/DOWN ripple counters and two separate preset pins. The four synchronous stages are created by the two separate preset pins and are used for sequencing the UP/DOWN ripple counters. The UP/DOWN ripple counters allow for count up, count down and the ability to preset counters. The counter can be reset, after which it will continue to cycle in either UP, DOWN or BCD sequence based on the particular design. The output of the counter is then sent to the decoder which interprets the output as either BCD or decimal output.

The CD74HC190E is designed to operate at temperatures between 0°C and 70 °C and features a wide supply voltage range of 2.5V to 6V. The device effectively offers a presettable synchronous up/down counter and an associated decoder, making it a versatile IC for digital applications.

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