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X24C44D

製品説明
仕様・特性

APPLICATION NOTE A V A I LA B L E AN3 • AN7 • AN8 • AN15• AN16 • AN25 • AN29 • AN30 • AN35 • AN36 • AN39 • AN56 • AN69 X24C44 256 Bit 16 x 16 Bit Serial Nonvolatile Static RAM DESCRIPTION • • • • The Xicor X24C44 is a serial 256 bit NOVRAM featuring a static RAM configured 16 x 16, overlaid bit-by-bit with a nonvolatile EEPROM array. The X24C44 is fabricated with Xicor’s Advanced CMOS Floating Gate technology. O bs CE (1) DI (3) SK (2) REV 1.0 6/22/00 du c ro E R AL L ST Column Decode EC Static RAM 256-Bit Row Decode Instruction Register Instruction Decode Nonvolatile EEPROM O ol et BLOCK DIAGRAM R • • Xicor NOVRAMs are designed for unlimited write operations to RAM, either from the host or RECALLs from EEPROM and a minimum 1,000,000 STORE operations. Inherent data retention is specified to be greater than 100 years. P • • • The Xicor NOVRAM design allows data to be transferred between the two memory arrays by means of software commands or external hardware inputs. A STORE operation (RAM data to EEPROM) is completed in 5ms or less and a RECALL operation (EEPROM data to RAM) is completed in 2µs or less. e • Advanced CMOS version of Xicor’s X2444 16 x 16 organization Single 5V supply Ideal for use with single chip microcomputers —Static timing —Minimum I/O interface —Serial port compatible (COPS™, 8051) —Easily interfaced to microcontroller ports Software and hardware control of nonvolatile functions Auto RECALL on power-up TTL and CMOS compatible Low power dissipation —Active current: 10mA maximum —Standby current: 50µA maximum 8-lead PDIP, Cerdip, and 8-lead SOIC packages High reliability —STORE cycles: 1,000,000 —Data retention: 100 years t FEATURES Control Logic RECALL (6) STORE (7) DO (4) 4-Bit Counter www.xicor.com Characteristics subject to change without notice. 1 of 14

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