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CAT24C44 Datasheet(PDF) 7 Page - ON Semiconductor |
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CAT24C44 Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 9 page CAT24C44 7 Doc. No. MD-1083, Rev. T © 2008 SCILLC. All rights reserved. Characteristics subject to change without notice RCL/ RECALL RECALL RECALL RECALL RECALL Data is transferred from the EEPROM data memory to RAM by either sending the RCL instruction or by pulling the RECALL input pin low. A recall operation must be performed before the EEPROM store, or RAM write operations can be executed. Either a hardware or soft- ware recall operation will set the “previous recall” latch internal to the CAT24C44. POWER-ON RECALL The CAT24C44 has a power-on recall function that transfers the EEPROM data to the RAM. After Power- up, all functions are inhibited for at least 200ns (Tpur) from stable Vcc. STO/ STORE STORE STORE STORE STORE Data in the RAM memory area is stored in the EEPROM memory either by sending the STO instruction or by pulling the STORE input pin low. As security against any inadvertent store operations, the following conditions must each be met before data can be transferred into nonvolatile storage: • The “previous recall” latch must be set (either a software or hardware recall operation). • The “write enable” latch must be set (WREN instruction issued). • STO instruction issued or STORE input low. During the store operation, all other CAT24C44 func- tions are inhibited. Upon completion of the store opera- tion, the “write enable” latch is reset. The device also provides false store protection whenever VCC falls below a 3.5V level. If VCC falls below this level, the store operation is disabled and the “write enable” latch is reset. Figure 6. Hardware Store Cycle Timing Figure 5. Recall Cycle Timing RECALL tRCZ tORC tRCC tRCP tARC VALID DATA UNDEFINED DATA DO HIGH-Z STORE tST tSTP DO tSTZ HIGH-Z |
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