74HC138

Driving 7-Segment Displays with 74HC164 and 74HC138 Using Serial Communication (Part 2)

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Driving 7-Segment Displays with 74HC164 and 74HC138 Using Serial Communication (Part 2)

Using analog serial port to drive74HC164, there is always a slight glow in segments that should not be lit, commonly referred to as ghosting, which is particularly noticeable at night. However, using serial port driving yields much better results; when external light is dim, ghosting is slightly visible but does not significantly affect viewing. This … Read more

Driving 7-Segment Displays with 74HC164 and 74HC138 Using 51 Microcontroller (Part 1)

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Driving 7-Segment Displays with 74HC164 and 74HC138 Using 51 Microcontroller (Part 1)

74HC138 is a CMOS 3-to-8 line decoder integrated circuit, featuring 3 input pins and 8 output pins, capable of converting 3 bits of binary data into 8 corresponding output signals. The 74HC138 chip operates within a supply voltage range of 2V to 6V, while the 74LS138 chip operates within a supply voltage range of 4.75V … Read more