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SN74AS195N Folha de dados(PDF) 1 Page - Texas Instruments |
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SN74AS195N Folha de dados(HTML) 1 Page - Texas Instruments |
1 / 9 page SN74AS195 4BIT BIDIRECTIONAL UNIVERSAL SHIFT REGISTER SDAS138B − DECEMBER 1983 − REVISED JANUARY 1995 Copyright 1995, Texas Instruments Incorporated 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 • Parallel-to-Serial, Serial-to-Parallel Conversions • Parallel Synchronous Loading • J and K Inputs to First Stage • Right Shift Only With Complementary Outputs on Last Stage • Direct Overriding Clear • Package Options Include Plastic Small-Outline (D) Packages and Standard Plastic (N) 300-mil DIPs description This 4-bit bidirectional universal shift register features parallel (A, B, C, D) inputs, parallel (QA, QB, QC, QD, QD) outputs, J-K serial (J, K) inputs, shift/load control (SH/LD) input, and a direct overriding clear (CLR). The registers have two modes of operation: • Parallel (broadside) load • Shift (in the direction Q A toward QD) Parallel loading is accomplished by applying the four bits of data and taking SH/LD low. The data is loaded into the associated flip-flops and appears at the outputs after the positive transition of the clock (CLK) input. During loading, serial data flow is inhibited. Shifting is accomplished synchronously when SH/LD is high. Serial data for this mode is entered at the J-K inputs. These inputs permit the first stage to perform as a J-K, D-, or T-type flip-flop as shown in the function table. The SN74AS195 is characterized for operation from 0 °C to 70°C. FUNCTION TABLE INPUTS OUTPUTS CLR SH/LD CLK SERIAL PARALLEL QA QB QC QD QD CLR SH/LD CLK J K A B C D QA QB QC QD QD L X X X X X X X X L L L L H H L ↑ X Xa bc d a bc d d H HL X XX XX X QA0 QB0 QC0 QD0 QD0 H H ↑ L HX XX X QA0 QA0 QBn QCn QCn H H ↑ L LX XX X L QAn QBn QCn QCn H H ↑ H HX XX X H QAn QBn QCn QCn H H ↑ H L X X X X QAN QAn QBn QCn QCn 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 CLR J K A B C D GND VCC QA QB QC QD QD CLK SH/LD D OR N PACKAGE (TOP VIEW) 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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