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STK22C48-WF35I Datasheet(PDF) 1 Page - Simtek Corporation |
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STK22C48-WF35I Datasheet(HTML) 1 Page - Simtek Corporation |
1 / 10 page March 2006 1 Document Control # ML0005 rev 0.2 STK25C48 2K x 8 AutoStore™ nvSRAM QuantumTrap™ CMOS Nonvolatile Static RAM Obsolete - Not Recommend for new Designs FEATURES • Nonvolatile Storage without Battery Problems • Directly Replaces 2K x 8 Static RAM, Battery- Backed RAM or EEPROMs • 25ns, 35ns and 45ns Access Times • STORE to Nonvolatile Elements Initiated by AutoStore™ on Power Down • RECALL to SRAM Initiated by Power Restore • 10mA Typical I CC at 200ns Cycle Time • Unlimited READ, WRITE and RECALL Cycles • 1,000,000 STORE Cycles to Nonvolatile Ele- ments • 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 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 Nonvolatile Elements. Data transfers from the SRAM to the Nonvola- tile Elements (the STORE operation) can take place auto- matically on power down using charge stored in system capacitance. Transfers from the Nonvolatile Elements to the SRAM (the RECALL operation) take place automati- cally on restoration 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 EEPROM s, allowing direct substitution while enhancing performance. No support circuitry is required for micro- processor interfacing. BLOCK DIAGRAM COLUMN I/O COLUMN DEC STATIC RAM ARRAY 32 x 512 QUANTUM TRAP 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 A7 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ 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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