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SN74ALS251DG4 Fiches technique(PDF) 1 Page - Texas Instruments |
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SN74ALS251DG4 Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 18 page SN54ALS251, SN74ALS251 1OF8 DATA SELECTORS/MULTIPLEXERS WITH 3STATE OUTPUTS SDAS215A − APRIL 1982 − REVISED DECEMBER 1994 Copyright 1994, Texas Instruments Incorporated 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 • 3-State Version of the ′ALS151 • 3-State Outputs Interface Directly With System Bus • Perform Parallel-to-Serial Conversion • Complementary Outputs Provide True and Inverted Data • Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs description These data selectors/multiplexers contain full binary decoding to select one-of-eight data sources and feature controlled complementary 3-state outputs. The 3-state outputs can interface with and drive data lines of bus-organized systems. With all but one of the common outputs disabled (at the high-impedance state), the low impedance of the signal-enabled output drives the bus line to a high or low logic level. Both outputs are controlled by the output-enable (OE) input. The outputs are disabled when OE is high. The SN54ALS251 is characterized for operation over the full military temperature range of − 55 °C to 125 °C. The SN74ALS251 is characterized for operation from 0 °C to 70°C. FUNCTION TABLE INPUTS OUTPUTS SELECT OE OUTPUTS C B A OE Y W X X X H Z Z L LL L D0 D0 L LHL D1 D1 L HL L D2 D2 L HH L D3 D3 H LL L D4 D4 H LHL D5 D5 H HL L D6 D6 H H H L D7 D7 D0, D1, . . . D7 = the level of the respective D input SN54ALS251 ...J PACKAGE SN74ALS251 ...D OR N PACKAGE (TOP VIEW) 32 1 20 19 910 11 12 13 4 5 6 7 8 18 17 16 15 14 D5 D6 NC D7 A D1 D0 NC Y W SN54ALS251 . . . FK PACKAGE (TOP VIEW) NC − No internal connection 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 D3 D2 D1 D0 Y W OE GND VCC D4 D5 D6 D7 A B C PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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