Using a 74HC595 serial/parallel register with a single clock

[quintosardo]

Hi,
did anybody try to use a 74HC595 connecting together the shift and the latch clock to use only two wires (data and clocks)?
I'm trying to do this but I have strange results until the chip gets locked (the output doesn't change).

Any suggestion?

Thanks

Quinto

 

[Attila_ati]

Hi
To run 74HC595 you must have at least 3 wires that includes serial data input,latch and shift.Unfortunately 74HC595 doesnt run properly with two wires.My advise that;dont forget to add third wire(serial data input) good luck;-)

 

[kisudu]

Re: Using a 74HC595 serial/parallel register with a single c

Beacause of above reasons, you should use 4094, that meet your demand.
Good luck,

 

[quintosardo]

Re: Using a 74HC595 serial/parallel register with a single c

I've solved the problem.
There was a bug in communication code.

Now I can drive the 595 with those 2 wires:

- serial data input
- shift and latch clocks tied together

I had to add one more clock up/dw because, as the datasheet says, latch clock is one step behind the shift clock, when tied together

 

[txdx2005]

if you do like you say,595 as 74ls164