Often there is no longer a parallel bus option directly available. That has been the migration of MCU devices from older microprocessor units with parallel busses to the much more prevalent modern types that have all their program storage memory and data memory built right on the chip. There is another factor that has played into the popularity of serial devices over parallel devices. And the reading time to load at most a few K-bytes of data from a serial device (SPI or I2C) is not normally an excessive time impact. For this type of application the relatively slow writing times of EEPROM are of little concern. The typical scenario is to write very seldom and read typically once each time the host device boots up. Number of pins and cost of packaging.ĮEPROM devices are primarily used to store parametric data or characterization constants for a device.
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