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PYA28C256-12LMB Datasheet(PDF) 3 Page - Pyramid Semiconductor Corporation |
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PYA28C256-12LMB Datasheet(HTML) 3 Page - Pyramid Semiconductor Corporation |
3 / 14 page PYA28C256 - 32K x 8 EEPROM Page 3 Document # EEPROM104 REV 03 3-byte command sequence used to enable SDP. Once set, SDP will remain active unless the disable com- mand sequence is issued. Power transitions do not dis- able SDP and SDP will protect the PYA28C256 during power-up and power-down conditions. All command se- quences must conform to the page write timing specifi- cations. The data in the enable and disable command sequences is not written to the device and the memory addresses used in the sequence may be written with data in either a byte or page write operation. After setting SDP, any attempt to write to the device with- out the 3-byte command sequence will start the internal write timers. No data will be written to the device; howev- er, for the duration of tWC, read operations will effectively be polling operations. DEVICE IDEnTIFICATIOn An extra 64 bytes of EEPROM memory are available to the user for device identification. By raising A9 to 12V ± 0.5V and using address locations 7FC0H to 7FFFH the additional bytes may be written to or read from in the same manner as the regular memory array. OPTIOnAL CHIP ERASE MODE The entire device can be erased using a 6-byte software code. Please see "Software Chip Erase" application note at the end of this datasheet for details. |
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