Monday, May 23, 2011

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74LS90 Counter With 7 Segment Display

Here is the circuit diagram of a seven segment counter based on the counter 74LS90 IC TTL.This circuit can be used in conjunction with various circuits where a counter to display the progress adds some more attraction. This circuit accepts any TTL compatible logic signal, and can be expanded easily.
74LS90  Counter Circuit With 7 Segment Display

 7 Segment Common anode
  • All pulses to be counted are to be TTL compatible. They should not exeed 5V and not fall below ground.
  • You can add more digits by building a second (or third, or fourth, etc...) circuit and connecting the pin 11-6 junction of the 74LS90 and 74LS47 to pin 14 of the 74LS90 in the other circuit. You can keep expanding this way to as many digits as you want. 

List Component:
R1-R7 : 470 Ohm 1/4 Watt Resistor
U1 : 74LS90 TTL BCD Counter IC
U2 : 74LS47 TTL Seven Segment Display Driver IC
DISP1 : Common Anode 7 Segment LED Display

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