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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 28 pin DIP BIOS chip (386 & 486 Motherboards) NEC D43256BCZ-70LL 256K-BIT [32K 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 GENERAL DESCRIPTION
DescriptionThe mPD43256B is a high speed, low power, and 262, 144 bits (32,768 words by 8 bits) CMOS static RAM.Battery backup is available (L, LL, A, and B versions). And A and B versions are wide voltage operations.The mPD43256B is packed in 28-pin plastic DIP, 28-pin plastic SOP and 28-pin plastic TSOP (I).Features• 32,768 words by 8 bits organization• Fast access time: 70, 85, 100, 120, 150 ns (MAX.)• Wide voltage range (A version: VCC = 3.0 to 5.5 V, B version: VCC = 2.7 to 5.5 V)• 2 V data retention• OE input for easy application
The μPD43256B is a high speed, low power, and 262, 144 bits (32,768 words by 8 bits) CMOS static RAM.Battery backup is available (L, LL, A, and B versions). And A and B versions are wide voltage operations.The μPD43256B is packed in 28-pin plastic DIP, 28-pin plastic SOP and 28-pin plastic TSOP (I).Features• 32,768 words by 8 bits organization• Fast access time: 70, 85, 100, 120, 150 ns (MAX.)• Wide voltage range (A version: VCC = 3.0 to 5.5 V, B version: VCC = 2.7 to 5.5 V)• 2 V data retention• OE input for easy applicationAccess timeOperatingOperatingStandbyData retention Part numberns (MAX.)supply voltagetemperaturesupply currentsupply currentNote 1V°CμA (MAX.)μA (MAX.)μPD43256B-L70, 854.5 to 5.50 to 70503μPD43256B-LL70, 85152μPD43256B-A85, 100Note 2, 120Note 23.0 to 5.5μPD43256B-BNote 2100, 120, 1502.7 to 5.5Notes 1.TA≤ 40 ̊C, VCC = 3 V2.Access time : 85 ns (MAX.) (VCC = 4.5 to 5.5 V)Version X and PThis data sheet can be applied to the version X and P. Each version is identified with its lot number. Letter X inthe fifth character position in a lot number signifies version X, letter P, version P.The information in this document is subject to change without notice.The mark shows major revised points.Document No. M10770EJ9V0DS00 (9th edition)Date Published May 1997 NPrinted in JapanD43256BJAPANLot number
