2-1 Pin Reduction for 74HC595 - SRCLK and RCLK

213

01:40:25

Using a PNP transistor, the control pins for shifting and latching a 595 shift register can be merged into one pin.

I'm not to sure about the resistances involved on the pins themselves, but I think with the limiting resistor on the base of the transistor the power consumption can be minimized.

published 10 years ago

CorneliaXaos

10 years ago

Oddly.. This should have worked, but I couldn't get it to... Instead, I just tied the pins together as I found a reference to do so in the datasheet. (It was hidden as a footnote in the timing section.) That works nicely, but you have to shift one extra time than needed.

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