© Warren Gay 2017

Warren Gay, Custom Raspberry Pi Interfaces, 10.1007/978-1-4842-2406-9_10

10. More Pi Outputs with 74HC595

Warren Gay

(1)St Catharines, Ontario, Canada

Like input GPIOs in Chapter 9, the application designer may require more GPIO outputs. Because this 74HC595 part is a member of the “HC” logic family, it is able to operate with a VCC ranging from 2.0 to 6.0 volts. This is perfect for operating under the 3.3V Raspberry Pi and costs less than a dollar at digikey.com. Figure 10-1 illustrates a chip that I’ve used.

A432417_1_En_10_Fig1_HTML.jpg
Figure 10-1. 74HC595 serial in, parallel out shift register

Note that the HCT family is designed for TTL input levels. I focus ...

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