They are particularly useful in embedded systems for storing configuration data to replace switches and jumpers.
#VERIFY QUANTUM PENDANT SERIAL NUMBER SERIAL#
Small EEPROMs are available with a serial interface so that they will fit into small (8-pin), low cost packages. The other problem is that they are slow to write, typically taking many microseconds or even milliseconds to erase and write, compared to 100 nano seconds typical of SRAM. This problem is due to the fact that charge can be trapped in defects in the insulator in the gate region resulting in some bits getting “stuck” in the programmed state. They are typically guaranteed for 10,000 to 100,000 write cycles, which would take only a few seconds if a program gets stuck in a tight loop writing to the EEPROM. EEPROM bits have a limited number of write cycles before they get “stuck” in the programmed state.
While these devices would seem to be nearly ideal as non-volatile read/write memories, they do have a couple of drawbacks. For many of the devices, each byte must be erased by writing ones to a location before it can be programmed. The operation is similar to an EPROM except that most types can be erased and programmed in circuit, using 5 volt power supplies and a standard micro processor bus interface. In an interesting application of quantum physics, the electrons “tunnel” through the insulator. The Integrated Circuit Hobbyist’s Handbookįowler-Nordheim tunneling where the insulator is thinned.The Forrest Mims Circuit Scrapbook, Volumes I and II.Programming Microcontrollers in C, Second Edition.Periodicals: Advertiser Supported Trade Magazines.Deactivate Interrupt and Other Requests on Power-Up.Determine if Transmission Line Termination is Required.Check DC Fan-Out: Output Current Drive vs.Digital Signal Processing / Digital Audio Recording.Unconventional Use of DRAM for Low Cost Data Storage.Special Proprietary Synchronous Serial Interfaces.Battery Powered System Design Considerations.Other Specialized Design Considerations.Timing and Level Conversion Considerations.Elementary I/O Devices and Applications.