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DM74LS259M Fiches technique(PDF) 1 Page - Fairchild Semiconductor |
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DM74LS259M Fiches technique(HTML) 1 Page - Fairchild Semiconductor |
1 / 6 page © 2000 Fairchild Semiconductor Corporation DS006418 www.fairchildsemi.com August 1986 Revised March 2000 DM74LS259 8-Bit Addressable Latches General Description These 8-bit addressable latches are designed for general purpose storage applications in digital systems. Specific uses include working registers, serial-holding registers, and active-high decoders or demultiplexers. They are mul- tifunctional devices capable of storing single-line data in eight addressable latches, and being a 1-of-8 decoder or demultiplexer with active-high outputs. Four distinct modes of operation are selectable by control- ling the clear and enable inputs as enumerated in the func- tion table. In the addressable-latch mode, data at the data- in terminal is written into the addressed latch. The addressed latch will follow the data input with all unad- dressed latches remaining in their previous states. In the memory mode, all latches remain in their previous states and are unaffected by the data or address inputs. To elimi- nate the possibility of entering erroneous data in the latches, the enable should be held HIGH (inactive) while the address lines are changing. In the 1-of-8 decoding or demultiplexing mode, the addressed output will follow the level of the D input with all other outputs LOW. In the clear mode, all outputs are LOW and unaffected by the address and data inputs. Features s 8-Bit parallel-out storage register performs serial-to-par- allel conversion with storage s Asynchronous parallel clear s Active high decoder s Enable/disable input simplifies expansion s Direct replacement for Fairchild DM9334 s Expandable for N-bit applications s Four distinct functional modes s Typical propagation delay times: Enable-to-output 18 ns Data-to-output 16 ns Address-to-output 21 ns Clear-to-output 17 ns s Fan-out IOL (sink current) 8 mA IOH (source current) −0.4 mA s Typical ICC 22 mA Ordering Code: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Order Number Package Number Package Description DM74LS259M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow DM74LS259WM M16B 16-Lead Small Outline Intergrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide DM74LS259N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide |
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