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 Winbond W29C020C-90Z 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.)
CHIP SPECIFICATIONS .PDF 256K 8 CMOS FLASH MEMORYQUICK GENERAL DESCRIPTION
The W29C020 is a 2-megabit, 5-volt only CMOS flash memory organized as 256K 8 bits. The devicecan be written (erased and programmed) in-system with a standard 5V power supply. A 12-volt VPP isnot required. The unique cell architecture of the W29C020 results in fast write (erase/program)operations with extremely low current consumption compared to other comparable 5-voltflash memory products. The device can also be written (erased and programmed) by using standardEPROM programmers.
FEATURES
Single 5-volt write (erase and program)operationsFast page-write operations
128 bytes per page
Page write (erase/program) cycle: 10 mS (max.)
Effective byte-write (erase/program) cycle time: 39 SOptional software-protected data writeFast chip-erase operation: 50 mS Two 8 KB boot blocks with lockoutTypical page write (erase/program) cycles:100/1K/10KRead access time: 70/90/120 nS Ten-year data retention
Software and hardware data protectionLow power consumption Active current: 25 mA (typ.) Standby current: 20 A (typ.)Automatic write (erase/program) timing with internal VPP generationEnd of write (erase/program) detection
Toggle bitData polling
Latched address and dataAll inputs and outputs directly TTL compatibleJEDEC standard byte-wide pinoutsAvailable packages: 32-pin 600 mil DIP, 450 milSOP, TSOP, and 32-pin PLCCPublication Release Date: February 1998- 1 - Revision A3