General documentation

• http://www.allaboutcircuits.com/vol_4/chpt_12/4.html
• http://www.electronics-tutorials.ws/sequential/seq_5.html
• A nice article about 74-595 8bits SR http://bildr.org/2011/02/74hc595/

ON 74LS164 - 8bit Serial-in / Parallel-out

74LS164.pdf

74HC595 - 8bit Serial-in / Parallel-out (with output latch)

• Can be driven with 3 pins (and use the latch function) or just 2 (no latch)
  • Sample of the 2-wire mode here http://picboard.blogspot.ca/2010/10/0-20v-digital-voltmeter-dvm-using.html
• Arduino doc here : http://www.arduino.cc/en/Tutorial/ShiftOut
• Doing soft PWM with 74HC595 http://www.elcojacobs.com/shiftpwm/

TI SN74198 - 8 bit Serial-in Parallel-in / Parallel-out

SN74198.pdf

Fairchild CD4014 - 8 bits shift register

Accepts parallel or serial in, and gives parallel or serial out

• http://www.doctronics.co.uk/4014.htm

Fairchild CD4015 - Dual 4 bits shift register

CD4015.pdf

• http://www.doctronics.co.uk/4015.htm

For the CD4015, make it a 8 bit by simply linking 4bit SIPO A & B:

• Link Output A4 to Data B
• Link the clock A & B together and reset A & B together
• Push data only through Data A
• Read 8 bit A1 A2 A3 A4 B1 B2 B3 B4

//Shift register write method
void shiftReg_Write (byte pByte){
  //i must be a int, if you put a byte if crash on the uC
  for (int i = 7 ; i >= 0; i--){
    byte v = (pByte >> i) & B00000001;
    if (v == 1){
      digitalWrite(CD4015_DATA, HIGH);
    }
    else {
      digitalWrite(CD4015_DATA, LOW);
    }
 
    digitalWrite(CD4015_CLOCK, LOW);
    delayMicroseconds(15); //needs average of 15us
    digitalWrite(CD4015_CLOCK, HIGH);
    delayMicroseconds(15); needs average of 15us <- IMPORTANT!
  }
}