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DM74ALS874BNT Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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DM74ALS874BNT Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 6 page © 2000 Fairchild Semiconductor Corporation DS006244 www.fairchildsemi.com April 1984 Revised February 2000 DM74ALS874B Dual 4-Bit D-Type Edge-Triggered Flip-Flop with 3-STATE Outputs General Description This dual 4-bit register features 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 this register 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. It is particularly attrac- tive for implementing buffer registers, I/O ports, bidirec- tional bus drivers, and working registers. The eight flip-flops of the DM74ALS874B are edge-trig- gered D-type flip-flops. On the positive transition of the clock, the Q outputs will be set to the logic states that were set up at the D inputs. 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 flip-flops. That is, the old data can be retained or new data can be entered even while the outputs are OFF. 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 Asynchronous clear 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 DM74ALS874BWM M24B 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide DM74ALS874BNT N24C 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-100, 0.300 Wide |
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