The 74LS140 is 4-input NAND gates, 50-Ohm line drivers.
In computer science, NAND is a logic gate that produces a logical “NOT-AND” output from two logical inputs. In addition to being a fundamental building block of digital circuits, NAND gates are also used to construct other logic gates, such as OR and NOT gates.
Logic symbols
Typical parameters: tpd = 12ns Pd = 4.3mW
74LS140 Logic Table
Recommended Operating Conditions
74LS140 Datasheet
Other data sheets are available within the file: 54LS140
Offered in 256Mx8bit, the K9F2G08U0B is a 2G-bit NAND Flash Memory with spare 64M-bit. Its NAND cell provides the most costeffective solution for the solid state application market. A program operation can be performed in typical 200μs on the (2K+64)Byte page and an erase operation can be performed in typical 1.5ms on a (128K+4K)Byte block. Data in the data register can be read out at 25ns cycle time per Byte. The I/O pins serve as the ports for address and data input/output as well as command input.
The on-chip write controller automates all program and erase functions including pulse repetition, where required, and internal verification and margining of data. Even the write-intensive systems can take advantage of the K9F2G08X0B′s extended reliability of 100K program/erase cycles by providing ECC(Error Correcting Code) with real time mapping-out algorithm.
