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HD74LS251P Datasheet(PDF) 1 Page - Renesas Technology Corp |
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HD74LS251P Datasheet(HTML) 1 Page - Renesas Technology Corp |
1 / 6 page Rev.3.00, Jul.15.2005, page 1 of 5 HD74LS251 1 of 8 Data Selector / Multiplexer (with strobe and three-state outputs) REJ03D0467–0300 Rev.3.00 Jul.15.2005 This data selector / multiplexer contains full on-chip binary decoding to select one-of-eight data sources and features a strobe-controlled 3-state output. The strobe must be at a low logic level to enable this device. The 3-state outputs permit a number of outputs to be connected 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 transistors of each totem-pole output are off, and the output neither 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 control circuitry is designed so that the average output disable time is shorter than the average output enable time. Features • Ordering Information Part Name Package Type Package Code (Previous Code) Package Abbreviation Taping Abbreviation (Quantity) HD74LS251P DILP-16 pin PRDP0016AE-B (DP-16FV) P — HD74LS251FPEL SOP-16 pin (JEITA) PRSP0016DH-B (FP-16DAV) FP EL (2,000 pcs/reel) Note: Please consult the sales office for the above package availability. Pin Arrangement (Top view) VCC 3 GND 15 16 1 2 3 4 5 6 7 14 8 9 10 11 12 13 D3 D2 S C W D0 D1 D4 B A D6 D5 2 1 0 Y W Strobe C B A 7 6 5 4 Y D7 Data Inputs Data Select Data Inputs Outputs |
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