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-35 is 350ns. The related X2864AD-35's datasheet is here and it mentions a 10ms write cycle.The part numbering scheme appears to be X2864abMc wherea: temperature rangeA = commercialAI = industrialB = militaryb: packageD = CDIP-28F = CFP-28K = CPGA-28E = CLCC-32c: 883 levelB = 883(blank) = normal
According to my 1985 Xicor data book, the write time is typically 2mS. If you read back the address you just wrote, it will return inverted data until the write cycle completes, then return true data. You can use this instead of a timer.