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1)Dear Sir, please answer. I'd like to use CD74HC165 register with 3.3V supply and I need to connect Q7 output of the CD74HC165 to the input of CD74AC14 (3.3V supply too). I will not have problems with this?
2) If I use 74AC series at 5V supply, then I can load output pin at 20 mA source current. If I use 74AC series at 3.3V supply, then can I load output pin at 20 mA source current (output pin in HIGH level and current flows from IC to GND via resistor) ?
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In reply to Clemens Ladisch:
Dear Clemens, Thank you
Please see my question #2, a added it later.
Please, answer. I need to transmit logic signals from outputs of register 74AC164 via wire 40-50 centimeters ( I use flat cable), then will I need to install after 74AC164 bus transceiver as 74AC623 or another?
In reply to Vladimir Naumenkov:
As shown in the "electrical characteristics" table, the output drive at 3.3 V is 12 mA/−4 mA with the specified voltage drop. You can get more current if you can live with a larger voltage drop. Whether this is enough for the ribbon cable depends on how noisy it is.
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