SPI Flash Memory Add-ons for Teensy 3.X

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Spansion's S25FL127SABNF 128 Mbit 108 MHz or S70FL01GSAGBH 1 Gbit 133 MHz Flash Memory using SPI to communicate with your microcontroller. The boards are designed to mount directly onto a Teensy 3.X and are of such small size that they won't interfere with other add-ons like battery chargers or motion sensors or IO ports like the I2C port on pins 16/17.The 3V3-only boards have a 100 nF bypass capacitor to reduce high-frequency noise and 100K pullups on the CS lines to reduce chip select problems. There are several existing SPIFlash libraries which make using these chips very easy! Here is a primer on SPI in general.These are very fast chips. They take about 400 microseconds to read/write a 256-byte page and either 44 (S25FL127) or 106 (S70FL01G) seconds to erase the entire chip. The read/write time is between 10 and 20 times faster than EEPROM.https://www.tindie.com/products/onehorse/spi-flash-memory-add-ons-for-teensy-3x/