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The
74HC595 is a very handy IC used in many
microcontroller projects. You clock in 8 bits of data (like, on/off
settings for 8 LEDs) via two lines, and when you toggle a third line,
it pops these settings out on 8 outputs on the IC. So you
trade 3 valuable lines on your microcontroller for 8 outputs - a pretty
good deal, eh? This is called "Shifting data out" of the
microcontroller by "synchronous serial communication". This is the
serial part of the deal, where each bit is "shifted in" one at a time,
then BOOM, they all appear at once (in parallel) on
the chips output.
There are some
great tutorials on how to use a shift register. Here's one
for the Arduino microcontroller, but the technique holds true for
pretty much all microcontrollers!Here's the basic
specifications: - 8-bit
- Logic
Family : HC
- Logical Function : Shift Register
- Operating
Supply Voltage (Typ) : 5V
- Output Type : 3-State
- Package
Type : DIP
- Propagation Delay Time : 265ns
- Operating
Temp Range : -40C to 125C
- Operating Supply Voltage
(Min) : 2V
- Operating Supply Voltage (Max) : 6V
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