Shift Register IC's 74HC164, 74HC165 And 74HC595

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EngineeringCal
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Shift Register IC's 74HC164, 74HC165 And 74HC595

Post by EngineeringCal »

Hi

Going to be programming the serial in/parallel out one.

What is TTL ? One board with shift register on it says it is TTL. Others say SPI or I2C.

Using PIC 16F84A. 8 LED mini board.

Can post code.

Any tips about this please?

Have a nice day
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CeaSaR
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Re: Shift Register IC's 74HC164, 74HC165 And 74HC595

Post by CeaSaR »

TTL is Transistor - Transistor - Logic. Most times it is associated with 0-5 levels. Here is a Wiki to get you started:
https://en.wikipedia.org/wiki/Transisto ... stor_logic
Hey, what do I know?
EngineeringCal
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Re: Shift Register IC's 74HC164, 74HC165 And 74HC595

Post by EngineeringCal »

Thanks CeaSaR

Here are the links for the three boards with shift registers we will be using.

https://www.futurlec.com/Mini_74HC595.shtml

That one says 'SPI control' (input) and 'output bits' guess those are TTL.

https://www.futurlec.com/Mini_TPIC6B595.shtml

This says 'a serial stream of data and converts this to a 8-bit standard TTL output.' Ooops! Looks like serial stream (bits) and TTL are different.

https://www.futurlec.com/Mini_74165.shtml

This one says '8 standard TTL inputs and converts these to a serial output stream for connection to most microcontrollers'

We will have to think about that for awhile.

Any tips on this would be welcome.
dyarker
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Re: Shift Register IC's 74HC164, 74HC165 And 74HC595

Post by dyarker »

TTL refers to voltage levels and impedance of the serial stream. (about 0 and almost +5V)
As opposed to an RS-232 (upto +25V downto -25V)serial, or current loop (+20mA / -20mA) serial.

Cheers,
Dale Y
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