Pin 16 is connected to the power supply and Pin 8 is connected to the ground. Pin 5 is connected to ground as we are using the pin to strobe the output. We can turn off all the LEDs at a moment using this Pin.

Pin 4 of 4511, which is blank input pin, used to turn off all the LEDs of the display, we are not using this pin in this circuit. Using this Pin, we can turn ON all the LEDs of the display to test the 7-segment display. PIN 3 (lamp test) is directly connected to 5v, used for the testing of LEDs. In this BCD to 7-Segment Driver circuit, we are giving input through the push buttons as LOW or HIGH to the Pins 1, 2, 6, and 7. For example: If you want to display ‘4’, the binary code of four is 0100 so we will give 0,1,0,0 to D, C, B, A inputs respectively and get the decimal number ‘4’ displayed on 7-segment. We just have to make those BCD inputs High or Low according to the BCD code of that decimal number and we get the decimal number on display. We can be able to display a decimal number without using this chipset, but then we need 3 more pins and circuit will be complex, for saving pin we are using this IC. For example, for printing number “2” on 7-segment display we will give 0010 to the inputs (A,B,C,D) of IC4511, like wise we can print 0-9 decimal number on single 7-segment display. This CD4511 IC is basically a BCD to 7-Segment decoder/driver IC, using which you can convert a binary number into a decimal number on the 7-segment display.

In this tutorial we are going to drive 7-segment display with IC 4511. There are many ICs available to drive a 7 Segment display like IC 4026, 4033 etc and we have covered driving 7-segment using 4026 and using 4033.

Multisim 7 segment display imput