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Part Number: SN74HC595
Please assist. I have attached circuit with many shift registers chained in a line. Also looking to add more of them.
The circuit works, however I am concerned if this is safe and reliable to use like this and also a bit baffled as to why it works ??Shift Registers Times 6.pdf
The same clock is applied to each shift register and I am wondering if there is possibilities of it going out and other shift registers down the line gets sampled at the wrong time ?
Are there any dangers to this circuit ?
What can I do to avoid these ?
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In reply to Emrys Maier:
Thank you, that helps a lot.
So if I understand you correctly, the circuit I attached using 6 x 8bit shift registers are pretty safe as it is ?
Even adding another 1 or 2 should be safe as long as my PCB tracks are similar, I would not need a clock-fanout device ?.
Also noting that my clock speed is less than 1MHz.
In reply to Neil Badenhorst:
In reply to Clemens Ladisch:
The datasheet specifies the propagation delay (tpd from SRCLK to QH') as 17 ns typical, 40 ns in the worst case at 5 V ± 10 %.5 × 17 ns = 85 ns; at 1 MHz, the signal edges would be 500 ns apart.
Thanks. So how much less than 500ns (edges apart) would be safe to operate at ? Lets say I take the worst case of 40ns and add another 2 8bit shift registers (so 8 in total) and end up at delay of 40ns x 7 = 280ns. Am I correct in saying this is still way safe ?
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