8 CONTROLLING HIGHER-POWERED DEVICES
Many Arduino users rely on the 74HC595 shift register for their projects, as it’s popular and easy to use. However, the 74HC595 can handle only a relatively low amount of current, especially when all pins are active: while you can draw 20 mA of current from one output continuously, the entire IC is rated for a draw of only 70 mA through the VCC or GND pin.
If you need 20 mA per output to drive, for instance, eight separate LEDs, you could use only three of the eight pins under recommended operating conditions. While it may be possible to exceed the manufacturer’s direction, good electronic designs should ...
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