Abstract

A 4 Gb NAND flash memory with 2 b/cell uses 90 nm CMOS to achieve simultaneous data load during program operation with 1.6 MB/s program throughput. Fuse or pad-bonding switches it to a 2 Gb 1 b/cell NAND flash memory. The row decoder located in the middle of the cell array reduces W/L rise time and coupling noise. A program-after-erase technique and lowered floating poly thickness minimize cell Vth distribution.

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