27220 Parallax Inc, 27220 Datasheet - Page 143
27220
Manufacturer Part Number
27220
Description
BOOK STAMPWORKS
Manufacturer
Parallax Inc
Datasheet
1.27220.pdf
(230 pages)
Specifications of 27220
Accessory Type
Booklet
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Not applicable / Not applicable
For Use With/related Products
StampWorks
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Not applicable / Not applicable
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Moving Forward · Page 133
With the 74HC595, the data must be latched to the outputs after the shift process.
Latching is accomplished by briefly pulsing the Latch control line (low-high-low). This
feature prevents the 74HC595 outputs from “rippling” as new data is being shifted
into or through the device. Note that the Latch line is pulled low through a resistor;
this prevents noise from inadvertently latching invalid data to the 74HC595 outputs
while the BASIC Stamp is initializing and the I/O pins are in a high-impedance state
(floating).
Taking it Further
Being serial devices, shift registers can be cascaded, allowing the BASIC Stamp to
control dozens of 74HC595 outputs with the same three I/O pins.
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