STK20C04

STK20C04 STK20C04 CMOS nvSRAM High Performance 512 x 8 Nonvolatile Static RAM FEATURES 30, 35 and 45ns Access Times 15, 20 and 25ns Output Enable Access Unlimited Read and Write to SRAM Hardware STORE Initiation Automatic STORE Timing 105 STORE cycles to EEPROM 10 year data retention in EEPROM Automatic RECALL on Power Up Hardware RECALL Initiation Unlimited RECALL cycles from EEPROM Single 5V±10% Operation Commercial and Industrial Temperatures Available in 600 mil PDIP package DESCRIPTION The Simtek STK20C04 is a fast static RAM (30, 35, 45ns), with a nonvolatile electrically-erasable PROM (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 EEPROM. Data may easily be transferred from the SRAM to the EEPROM (STORE), or from the EEPROM to the SRAM (RECALL) using the NE pin. It combines the high performance and ease of use of a fast SRAM with nonvolatile data integrity. The STK20C04 features the industry standard pinout for nonvolatile RAMs in a 28-pin 600 mil plastic DIP. LOGIC BLOCK DIAGRAM EEPROM ARRAY 64 X 64 STORE ROW DECODER PIN CONFIGURATIONS NE NC A7 A 6 5 4 3 2 1 0 0 1 2 14 15 6 7 8 9 10 11 12 13 23 22 21 20 19 18 17 16 1 2 3 4 5 28 27 26 25 24 V CC W NC A 8 A3 A4 A5 A6 A7 A8 STATIC RAM ARRAY 64 X 64 RECALL A A A A A A DQ DQ DO NC NC G NC E DQ 7 DQ 6 DQ 5 DQ 4 DQ 3 VSS 28 - 600 PDIP DQ 0 DQ 1 DQ 2 DQ 3 DQ 4 DQ 5 DQ 6 D...