Datenblatt-Suchmaschine für elektronische Bauteile |
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DM74LS251M Datenblatt(PDF) 1 Page - Fairchild Semiconductor |
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DM74LS251M Datenblatt(HTML) 1 Page - Fairchild Semiconductor |
1 / 6 page © 2000 Fairchild Semiconductor Corporation DS006415 www.fairchildsemi.com August 1986 Revised March 2000 DM74LS251 3-STATE 1-of-8 Line Data Selector/Multiplexer General Description These data selectors/multiplexers contain full on-chip binary decoding to select one-of-eight data sources, and feature a strobe-controlled 3-STATE output. The strobe must be at a low logic level to enable these devices. The 3- STATE outputs permit direct connection to a common bus. When the strobe input is HIGH, both outputs are in a high- impedance state in which both the upper and lower transis- tors of each totem-pole output are OFF, and the output nei- ther drives nor loads the bus significantly. When the strobe is LOW, the outputs are activated and operate as standard TTL totem-pole outputs. To minimize the possibility that two outputs will attempt to take a common bus to opposite logic levels, the output con- trol circuitry is designed so that the average output disable time is shorter than the average output enable time. Features s 3-STATE version of DM74LS151 s Interface directly with system bus s Perform parallel-to-serial conversion s Permit multiplexing from N-lines to one line s Complementary outputs provide true and inverted data s Maximum number of common outputs: 129 s Typical propagation delay time (D to Y): 17 ns s Typical power dissipation: 35 mW Ordering Code: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Function Table H = HIGH Logic Level L = LOW Logic Level X = Don't Care Z = High Impedance (OFF) D0, D1…D7 = The level of the respective D input Order Number Package Number Package Description DM74LS251M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow DM74LS251N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Inputs Outputs Select Strobe YW CBA S XX X H Z Z LL L L D0 D0 LL H L D1 D1 LH L L D2 D2 LH H L D3 D3 HL L L D4 D4 HL H L D5 D5 HH L L D6 D6 HHH L D7 D7 |
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