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SN74ALS137ANSRE4 데이터시트(PDF) 1 Page - Texas Instruments |
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SN74ALS137ANSRE4 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 15 page SN54ALS137A, SN74ALS137A, SN74AS137 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS WITH ADDRESS LATCHES SDAS203C – APRIL 1982 – REVISED JANUARY 1995 Copyright © 1995, Texas Instruments Incorporated 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 • Combines Decoder and 3-Bit Address Latch • Incorporates Two Output Enables to Simplify Cascading • Package Options Include Plastic Small- Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs description The SN54ALS137A, SN74ALS137A, and SN74AS137 are 3-line to 8-line decoders/ demultiplexers with latches on the three address inputs. When the latch-enable (LE) input is low, the devices act as decoders/demultiplexers. When LE goes from low to high, the address present at the select (A, B, and C) inputs is stored in the latches. Further address changes are ignored as long as LE remains high. The output-enable controls (G1 and G2) control the outputs independently of the select or latch-enable inputs. All of the outputs are forced high if G1 is low or G2 is high. These devices are ideally suited for implementing glitch-free decoders in strobed (stored-address) applications in bus-oriented systems. The SN54ALS137A is characterized for operation over the full military temperature range of – 55 °C to 125 °C. The SN74ALS137A and SN74AS137 are characterized for operation from 0 °C to 70°C. FUNCTION TABLE INPUTS OUTPUTS ENABLE SELECT OUTPUTS LE 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 LX X XX H HH HH HH H L H L L L L L H H H H H H H L HL L LH H L H HH HH H L HL L HLH H L HH HH H L HL L HH H HH L H HH H L H L H L L H H H H L H H H L HL H LH H HH HH L H H L HL H HLH HH HH H L H L HL H HH H HH HH HH L H H L X X X Outputs corresponding to stored address = L; all others = H SN54ALS137A ...J PACKAGE SN74ALS137A, SN74AS137 ...D OR N PACKAGE (TOP VIEW) 3 2 1 20 19 910 11 12 13 4 5 6 7 8 18 17 16 15 14 Y1 Y2 NC Y3 Y4 C LE NC G2 G1 SN54ALS137A . . . FK PACKAGE (TOP VIEW) NC – No internal connection 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 A B C LE 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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