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ACT-E128K32C-300P3C Datasheet(PDF) 5 Page - Aeroflex Circuit Technology |
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ACT-E128K32C-300P3C Datasheet(HTML) 5 Page - Aeroflex Circuit Technology |
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5 / 12 page  A A Aeroflex Circuit Technology SCD1662 REV B 9/5/01 Plainview NY (516) 694-6700 5 The usual procedure is to increment the least significant address lines from A0 through A6 at each write cycle. In this manner a page of up to 128 bytes can be loaded in to the EEPROM in a burst mode before beginning the relatively long interval programming cycle. After the tBLC time out is completed, the EEPROM begins an internal write cycle. During this cycle the entire page will be written at the same time. The internal programming cycle is the same regardless of the number of bytes accessed. SOFTWARE DATA PROTECTION A software write protection feature may be enabled or disabled by the user. When shipped by Aeroflex Microelectronics, the ACT-E128K32 has the feature disabled. Write access to the device is unrestricted. To enable software write protection, the user writes three access code bytes to three special internal locations. Once write protection has been enabled, each write to the EEPROM must use the same three byte write sequence to permit writing. The write protection feature can be disabled by a six byte write sequence of specific data to specific locations. Power transitions will not reset the software write protection. Each 128K byte block of the EEPROM has independent write protection. One or more blocks may be enabled and the rest disabled in any combination. The software write protection guards against inadvertent writes during power transitions, or unauthorized modification using a PROM programmer. HARDWARE DATA PROTECTION These features protect against inadvertent writes to the ACT-E128K32. These are included to improve reliability during normal operation: A) Vcc Sense While below 3.8V typical write cycles are inhibited. B) Write inhibiting Holding OE low and either CE or WE high inhibits write cycles. C) Noise filter Pulses of <10ns (TYP) on WE or CE will not initiate a write cycle. |
Similar Part No. - ACT-E128K32C-300P3C |
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Similar Description - ACT-E128K32C-300P3C |
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