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SN74F251 데이터시트(PDF) 1 Page - Texas Instruments |
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SN74F251 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 7 page SN54F251B, SN74F251B 1-OF-8 DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SDFS066A – MARCH 1987 – REVISED OCTOBER 1993 Copyright © 1993, Texas Instruments Incorporated 2–1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 • 3-State Versions of SN54F151B and SN74F151B • 3-State Outputs Interface Directly With System Bus • Performs Parallel-to-Serial Conversion • Complementary Outputs Provide True and Inverted Data • Package Options Include Plastic Small-Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs description These data selectors/multiplexers contain full binary decoding to select one of eight data sources and feature strobe-controlled complementary outputs. The 3-state outputs can interface with and drive data lines of bus- organized systems. When the strobe (G) 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. The SN54F251B is characterized for operation over the full military temperature range of – 55 °C to 125 °C. The SN74F251B is characterized for operation from 0 °C to 70°C. FUNCTION TABLE INPUTS OUTPUTS SELECT STROBE OUTPUTS C B A G Y W X X X H Z Z L LL L D0 D0 L LH L D1 D1 L HL L D2 D2 L HH L D3 D3 H LL L D4 D4 H LH L D5 D5 H HL L D6 D6 H H H L D7 D7 D0, D1, . . . D7 = the level of the respective D input. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 D3 D2 D1 D0 Y W G GND VCC D4 D5 D6 D7 A B C SN54F251B ...J PACKAGE SN74F251B ...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 SN54F251B . . . FK PACKAGE (TOP VIEW) NC – No internal connection 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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