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CAT28C256GI-12T Datasheet(PDF) 9 Page - ON Semiconductor |
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CAT28C256GI-12T Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 14 page CAT28C256 http://onsemi.com 9 Hardware Data Protection The following is a list of hardware data protection features that are incorporated into the CAT28C256. 1. VCC sense provides for write protection when VCC falls below 3.5 V min. 2. A power on delay mechanism, tINIT (see AC characteristics), provides a 5 to 10 ms delay before a write sequence, after VCC has reached 3.5 V min. 3. Write inhibit is activated by holding any one of OE low, CE high or WE high. 4. Noise pulses of less than 20 ns on the WE or CE inputs will not result in a write cycle. Software Data Protection The CAT28C256 features a software controlled data protection scheme which, once enabled, requires a data algorithm to be issued to the device before a write can be performed. The device is shipped from ON Semiconductor with the software protection NOT ENABLED (the CAT28C256 is in the standard operating mode). WRITE DATA: XX WRITE LAST BYTE TO LAST ADDRESS TO ANY ADDRESS WRITE DATA: AA ADDRESS: 5555 WRITE DATA: 55 ADDRESS: 2AAA WRITE DATA: A0 ADDRESS: 5555 WRITE DATA: AA ADDRESS: 5555 WRITE DATA: 55 ADDRESS: 2AAA WRITE DATA: 80 ADDRESS: 5555 WRITE DATA: AA ADDRESS: 5555 WRITE DATA: 55 ADDRESS: 2AAA 20 ADDRESS: 5555 Figure 10. Write Sequence for Activating Software Data Protection Figure 11. Write Sequence for Deactivating Software Data Protection WRITE DATA: SOFTWARE DATA PROTECTION ACTIVATED (Note 15) 15.Write protection is activated at this point whether or not any more writes are completed. Writing to addresses must occur within tBLC Max., after SDP activation. |
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