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DM74AS874 Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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DM74AS874 Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 6 page ![]() © 2003 Fairchild Semiconductor Corporation DS006331 www.fairchildsemi.com October 1986 Revised July 2003 DM74AS874 Dual 4-Bit D-Type Edge-Triggered Flip-Flop General Description These dual 4-bit inverting registers feature totem-pole 3- STATE outputs designed specifically for driving highly- capacitive or relatively low-impedance loads. The high- impedance state and increased high-logic-level drive pro- vide these registers with the capability of being connected directly to and driving the bus lines in a bus-organized sys- tem without need for interface or pull-up components. They are particularly attractive for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. The eight flip-flops of the DM74AS874 are edge-triggered 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. The pinout is arranged to ease printed circuit board layout. All data inputs are on one side of the package, while all outputs 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 DM74AS874WM M24B 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide DM74AS874NT N24C 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide |
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