Notes on Cascading IC 74595

Introduction

• Previous video covered basics of IC 74595.
• Ensure to watch the basic video before proceeding with this lecture.

Key Points for Cascading IC 74595

• Required Pins for Cascading: Pin numbers 9, 11, 12, and 14.
• Using three ICs for demonstration.

Pin Connections

First IC Connections

• Pin 8 and 13: Connect to Ground.
• Pin 10 and 16: Connect to +VCC.
• Pin 14: Data In.
• Pin 9: Serial Out.

Cascading Connections

• Connect Serial Out to Next IC:
  • Pin 9 of 1st IC to Pin 14 of 2nd IC.
  • Pin 9 of 2nd IC to Pin 14 of 3rd IC.
• Pin 11 (Shift Register Clock) and Pin 12 (Storage Register Clock): Connect all together.

Practical Implementation

• Adding two more ICs to have a total of 24 outputs (8 outputs per IC).
• LED Connections:
  • Negative pin of LEDs connected to the negative rail.
  • Pin Connections:
    • Pin 10 and 16 to positive rail.
    • Pin 8 and 13 to negative rail.

Data Input and Control

• Data provided to the first IC through Pin 14.
• Pull-down resistor not needed as the pin is connected to the IC.
• Connection of Pins:
  • Pin 11 and 12 connected to respective clocks.

LED Output Connections

• Output Mapping:
  • LED 1 to IC1 (Pin 15).
  • LED 9 to IC2 (Pin 15).
  • LED 17 to IC3 (Pin 15).
  • Continue mapping until LED 24.

Final Steps

• Connect +5V and Ground to the circuit.
• Previous video discussed how to push data into the IC.

Demonstration

• Set initial data to zero and make some bits high (1).
• Push five ones into the IC and observe the LEDs lighting up.
• Push zeros to see the shifting effect in action.

Conclusion

• Recap of cascading IC 74595.
• Encouragement to like, share, and subscribe for more content.
• Invite viewers to ask questions in the comments.
• Tease next video topic.