We will give the clock pulse to the IC 74LS90 which will send the data to the IC 74LS48 and the IC 74LS48 will generate the output on 7-segment. We will use the IC to give the input to the IC 74LS48. Which generates 0-9 four-bit binary data. To give the input data we can use microcontrollers but here we will use 74LS90 IC. In this example, we will design a simple 0 to 9 automatic counters. No matter how much IC we use every time the IC will follow the following truth table to show the output. The multiple 7-segments can be used with multiple IC and RBO can be used to generate the output for the other 74LS48 IC to clear the zero in case of multiple 7-segments. The 7-segment will not need any sperate power supply. The IC will require 220-ohm resistance to work with the 7-segment. In the case of using the IC with 7 segments, we will need to connect the IC with 7-segment according to the given circuit. It is because the IC was designed to perform that function. Whenever there will be input on the IC from 0 to 9 then the output value will be according to the common cathode 7 segments. In a 4-bit binary digit, the decimal zero is represented by 0000 and decimal 9 is represented by 1001, and all the values from 1 to 8 also have fixed 4 digital binary code. The main input pins are four which helps to generate the fixed output states on specific input data. In IC 74LS48 the output depends on the input. The output voltage range is 4.2 for the HIGH state and 0.5 for the LOW state.įor more information on check 74LS48 BCD decoder datasheet.The output current range at BI/RBO’ pin is -50uA for HIGH and 3.2mA for LOW.The output current for the HIGH and LOW state on the output pins a to g is -100uA for HIGH and 6mA for LOW.The operating temperature range for IC is 0 to 70 degree.The power supply range for IC is 5.75 to 5.25 Volts and the voltage should not exceed the maximum range.The IC is fully functional with any common cathode 7-segment.It comes with Ripple Blanking Input and output pins which helps to remove the unnecessary zero in case of multiple 7-Segments.It has internal pull up resistors which eliminate the requirement of external resistors.IC 74LS48 comes up with internal clamp diodes, which protects the IC from high-speed termination.It can be used with any TTL device or microcontroller.Pin 16 is used to supply the power to the IC to make it functional.įEATURES 74LS48 BCD to 7- Segment Decoder Every alphabet represents the alphabet of led on 7-segment. The sequence of pins will be a, b, c, d, e, f & g. They will give the output signals to control the 7-segments. Pin 9 to Pin 15 will be used as the output pins. It is used to make the ground common to make the IC functional with other TTL devices and microcontrollers. Pin 7 represents the LSB of the 4-bit input data of the IC. Pin 6 represents the MSB of the 4-bit input data of the IC. It uses in case of multiple 7 segments to clear the unnecessary zeros. Pin 5 is known as Ripple Blanking Input pin. It is an active LOW pin, it will make all the output state LOW. In case of LOW state on pin 4, there won’t be any output. It is used to make all the output pins HIGH to test all the 7-segment led. Pin 2 represents the second bit of 4-bit input data of the IC. IC 74LS48 has 4 input pins and Pin 1 represents the third bit of 4-bit input data of the IC. It is only used to control common cathode 7-Segments. The IC is a TTL based device, which allows it to be controlled by any TTL device or microcontroller. The IC has 4 input pins which make a total of 16 combinations but the first 10 combinations used to generate the output on 7-segment and the rest of them will be considered as invalid states. The output pins generate two BCD digits in single output, which makes a single number on 7-segment. These all gates combination makes the IC with 4 input and 7 output pins. It has 17 AND gate, 4 NOR gate, 6 NOT gates, and 8 NAND gate. To do the special pattern we could use logic gates, but an IC 74LS48 can also be used to control the 7-segments. Every time to make a single number some specific pins should have power input. Each 7-Segment has seven input pins to light up a single led in the seven segments. The 7-Segment is a small seven LED-based device use to represent a single numeric value from 0 to 9. 74LS48 is a BCD to seven segments decoder that is used to display numbers decoded in binary coded decimal format.
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