NOTE: NOT ALL CMOS CHIPS ARE THE SAME INTERNALLY. THEY MAY HAVE THE SAME SPECIFICATIONS (ie 2M-bit 256k x 8-bit) BUT CAN HAVE DIFFERENT PIN LAYOUTS OR STORE DATA IN DIFFERENT AREAS OF THE CHIP CAUSING THEM NOT TO WORK CORRECTLY (no boot, beep codes, or failed 2nd re-boot) FOR YOUR MOTHERBOARD. ALWAYS TRY TO REPLACE YOUR CMOS CHIP WITH THE EXACT SAME MANUFACTURE AND PART NUMBER AS THE ORGINAL CHIP OTHERWISE YOUR TAKING A REAL GAMBLE.
CMOS 32 pin DIP BIOS chip SST 29EE020 120-4C-PH 2M-BIT [256K x 8] CMOS FLASH MEMORY. (We can program this chip for you for FREE if you can provide us with the needed BIOS firmware for your vintage motherboard.)
DETAILED CHIP SPECIFICATIONS .PDF LINK:
https://www.alldatasheet.com/datasheet-pdf/pdf/46495/SST/SST29EE020.html
QUICK GENERAL DESCRIPTION
PRODUCT DESCRIPTION
The SST29EE/LE/VE020 are 256K x8 CMOS Page-Write EEPROM manufactured with SST’s proprietary, high performance CMOS SuperFlash technology. The split-gate cell design and thick oxide tunneling injector attain better reliability and manufacturability compared with alternate approaches. The SST29EE/LE/VE020 write with a single power supply. Internal Erase/Program is transparent to the user. The SST29EE/LE/VE020 conform to JEDEC standard pinouts for byte-wide memories.
FEATURES:
• Single Voltage Read and Write Operations
– 5.0V-only for SST29EE020
– 3.0-3.6V for SST29LE020
– 2.7-3.6V for SST29VE020
• Superior Reliability
– Endurance: 100,000 Cycles (typical)
– Greater than 100 years Data Retention
• Low Power Consumption
– Active Current: 20 mA (typical) for 5V and
10 mA (typical) for 3.0/2.7V
– Standby Current: 10 µA (typical)
• Fast Page-Write Operation
– 128 Bytes per Page, 2048 Pages
– Page-Write Cycle: 5 ms (typical)
– Complete Memory Rewrite: 10 sec (typical)
– Effective Byte-Write Cycle Time: 39 µs (typical)
• Fast Read Access Time
– 5.0V-only operation: 120 and 150 ns
– 3.0-3.6V operation: 200 and 250 ns
– 2.7-3.6V operation: 200 and 250 ns
• Latched Address and Data
• Automatic Write Timing
– Internal VPP Generation
• End of Write Detection
– Toggle Bit
– Data# Polling
• Hardware and Software Data Protection
• Product Identification can be accessed via
Software Operation
• TTL I/O Compatibility
• JEDEC Standard
– Flash EEPROM Pinouts and command sets
• Packages Available
– 32-lead PLCC
– 32-lead TSOP (8mm x 14mm, 8mm x 20mm)
– 32-pin PDIP
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