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SN74AS131A 데이터시트(PDF) 1 Page - Texas Instruments |
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SN74AS131A 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 6 page SN74AS131A 3LINE TO 8LINE DECODER/DEMULTIPLEXER WITH ADDRESS REGISTERS SDAS060C − 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 • Combines Decoder and 3-Bit Address Register • Incorporates Two Enable Inputs to Simplify Cascading • Package Options Include Plastic Small-Outline (D) Packages and Standard Plastic (N) 300-mil DIPs description The SN74AS131A is a 3-line to 8-line decoder/demultiplexer with registers on the three address inputs. When the clock (CLK) input goes from low to high, the device acts as a decoder/ demultiplexer and the address present at the select (A, B, and C) inputs is stored in the registers. Further address changes are ignored until the next rising transition of CLK. The output-enable (G1, G2) inputs control the state of the outputs independently of the select or CLK inputs. All of the outputs are high unless G1 is high and G2 is low. This device is ideally suited for implementing glitch-free decoders in strobed (stored-address) applications in bus-oriented systems. The SN74AS131A is characterized for operation from 0 °C to 70°C. FUNCTION TABLE INPUTS OUTPUTS CLK ENABLE SELECT OUTPUTS CLK G1 G2 C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 X X H X X X H H H H H H H H X L XX XX H HH HH HH H ↑ H L L L L L H H H H H H H ↑ H LL LH H L H HH HH H ↑ H LL HLH H L HH HH H ↑ H LL HH H HH L H HH H ↑ H L H L L H H H H L H H H ↑ H LH LH H HH HH L H H ↑ H LH HLH HH HH H L H ↑ H LH HH H HH HH HH L L or H H L X X X Outputs corresponding to stored address = L; all others = H. D OR N PACKAGE (TOP VIEW) 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 A B C CLK G2 G1 Y7 GND VCC Y0 Y1 Y2 Y3 Y4 Y5 Y6 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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