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DM74AS873NT Arkusz danych(PDF) 1 Page - Fairchild Semiconductor |
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DM74AS873NT Arkusz danych(HTML) 1 Page - Fairchild Semiconductor |
1 / 5 page © 2003 Fairchild Semiconductor Corporation DS006330 www.fairchildsemi.com December 1986 Revised July 2003 DM74AS873 Dual 4-Bit D-Type Transparent Latches with 3-STATE Outputs General Description These dual 4-bit registers feature totem-pole 3-STATE out- puts designed specifically for driving highly-capacitive or relatively low-impedance loads. The high-impedance state and increased high-logic-level drive provide these registers with the capability of being connected directly to and driv- ing the bus lines in a bus-organized system without need for interface or pull-up components. They are particularly attractive for implementing buffer registers, I/O ports, bidi- rectional bus drivers, and working registers. The eight latches of the DM74AS873 are transparent D- type latches meaning that while the enable (G) is HIGH the Q outputs will follow the data (D) inputs. When the enable is taken LOW the output will be latched at the level of the data that was set up. A buffered output control input can be used to place the eight outputs in either a normal logic state (HIGH or LOW logic levels) or a high-impedance state. In the high-imped- ance state the outputs neither load nor drive the bus lines significantly. The output control does not affect the internal operation of the latches. That is, the old data can be retained or new data can be entered even while the outputs are OFF. The pinout is arranged to ease printed circuit board layout. All data inputs are on one side of the package while all out- puts are on the other side. Features s Switching specifications at 50 pF s Switching specifications guaranteed over full tempera- ture and VCC range s Advanced oxide-isolated, ion-implanted Schottky TTL process s 3-STATE buffer-type outputs drive bus lines directly s Space Saving 300 Mil Wide Package s Bus structured pinout Ordering Code: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Order Number Package Number Package Description DM74AS873NT N24C 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide |
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