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STK25C48-W20I Folha de dados(PDF) 1 Page - List of Unclassifed Manufacturers |
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STK25C48-W20I Folha de dados(HTML) 1 Page - List of Unclassifed Manufacturers |
1 / 8 page July 1999 3-31 STK25C48 2K x 8 AutoStore™ nvSRAM QuantumTrap™ CMOS Nonvolatile Static RAM FEATURES • Nonvolatile Storage without Battery Problems • Directly Replaces 2K x 8 Static RAM, Battery- Backed RAM or EEPROM • 20ns, 25ns, 35ns and 45ns Access Times • STORE to EEPROM Initiated by AutoStore™ on Power Down • RECALL to SRAM Initiated by Software or Power Restore • 10mA Typical I CC at 200ns Cycle Time • Unlimited READ, WRITE and RECALL Cycles • 1,000,000 STORE Cycles to EEPROM • 100-Year Data Retention over Full Industrial Temperature Range • Commercial and Industrial Temperatures • 24-Pin 600 PDIP Package DESCRIPTION The STK25C48 is a fast SRAM with a nonvolatile EEPROM element incorporated in each static memory cell. The SRAM can be read and written an unlimited number of times, while independent nonvolatile data resides in the EEPROM. Data transfers from the SRAM to the EEPROM (the STORE operation) can take place auto- matically on power down using charge stored in system capacitance. Transfers from the EEPROM to the SRAM (the RECALL operation) take place automatically on res- toration of power. The nvSRAM can be used in place of existing 2K x 8 SRAMs and also matches the pinout of 2K x 8 battery-backed SRAMs, EPROMs and EEPROMs, allowing direct substitution while enhancing performance. There is no limit on the number of read or write cycles that can be executed, and no support circuitry is required for microprocessor interfacing. BLOCK DIAGRAM COLUMN I/O COLUMN DEC STATIC RAM ARRAY 32 x 512 EEPROM ARRAY 32 x 512 STORE/ RECALL CONTROL STORE RECALL POWER CONTROL A5 A6 A9 DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 VCC G E W A8 A7 A10 A3 A2 A0 A1 A4 PIN CONFIGURATIONS VCC A9 W G A10 E A8 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 DQ7 DQ6 DQ5 DQ4 DQ3 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 VSS A6 24 - 600 PDIP PIN NAMES A0 - A10 Address Inputs W Write Enable DQ0 - DQ7 Data In/Out E Chip Enable G Output Enable VCC Power (+ 5V) VSS Ground |
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Descrição semelhante - STK25C48-W20I |
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