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SN74ALS139DR Folha de dados(PDF) 1 Page - Texas Instruments |
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SN74ALS139DR Folha de dados(HTML) 1 Page - Texas Instruments |
1 / 15 page SN54ALS139, SN74ALS139 DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS SDAS204A – APRIL 1982 – REVISED DECEMBER 1994 Copyright © 1994, Texas Instruments Incorporated 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 • Designed Specifically for High-Speed Memory Decoders and Data Transmission Systems • Incorporate Two Enable Inputs to Simplify Cascading and /or Data Reception • Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs description The ′ALS139 are dual 2-line to 4-line decoders/demultiplexers designed for use in high-performance memory-decoding or data- routing applications requiring very short propagation delay times. In high-performance memory systems, these devices can minimize the effects of system decoding. When employed with high-speed memories utilizing a fast-enable circuit, the delay times of these decoders and the enable time of the memory are usually less than the typical access time of the memory. Therefore, the effective system delay introduced by the Schottky-clamped system decoder is negligible. The ′ALS139 comprise two individual 2-line to 4-line decoders in a single package. The active-low enable (G) input can be used as a data line in demultiplexing applications. These decoders/demultiplexers feature fully buffered inputs, each of which represents only one normalized load to its driving circuit. All inputs are clamped with high-performance Schottky diodes to suppress line ringing and simplify system design. The SN54ALS139 is characterized for operation over the full military temperature range of – 55 °C to 125°C. The SN74ALS139 is characterized for operation from 0 °C to 70°C. FUNCTION TABLE INPUTS OUTPUTS ENABLE SELECT OUTPUTS ENABLE G B A Y0 Y1 Y2 Y3 H X X H H H H L L LL HH H L L HH LH H L H LH HLH L H H H H H L SN54ALS139 ...J PACKAGE SN74ALS139 ...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 2A 2B NC 2Y0 2Y1 1B 1Y0 NC 1Y1 1Y2 SN54ALS139 . . . FK PACKAGE (TOP VIEW) NC – No internal connection 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 1G 1A 1B 1Y0 1Y1 1Y2 1Y3 GND VCC 2G 2A 2B 2Y0 2Y1 2Y2 2Y3 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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