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SN74ALS870NT Fiches technique(PDF) 1 Page - Texas Instruments |
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SN74ALS870NT Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 7 page DW OR NT PACKAGE (TOP VIEW) 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 S0 1A0 1A1 1A2 1A3 1W S2 DQA1 DQA2 DQA3 DQA4 GND VCC S1 2A3 2A2 2A1 2A0 2W S3 DQB4 DQB3 DQB2 DQB1 SN74ALS870 DUAL 16-BY-4 REGISTER FILES SDAS139A – DECEMBER 1982 – REVISED JANUARY 1995 Copyright © 1995, Texas Instruments Incorporated 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 • 3-State Buffer-Type Outputs Drive Bus Lines Directly • Each Register File Has Individual Write-Enable Controls and Address Lines • Designed Specifically for Multibus Architecture and Overlapping File Operations • Prioritized B-Input Port Prevents Write Conflicts During Dual-Input Mode • Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic (NT) 300-mil DIPs description This device features two 16-word by 4-bit register files. Each register file has individual write-enable (1W, 2W) controls and address lines. This device has two 4-bit data I/O ports (DQA1–DQA4 and DQB1–DQB4). The data I/O ports can output to bus A and bus B, receive input from bus A and bus B, receive input from bus A and output to bus B, or output to bus A and receive input from bus B. To prevent writing conflicts in the dual-input mode, the B-input port takes priority. Two select (S0 and S1) lines control which port has access to which register. S2 determines whether the A ports are in the input or the output modes and S3 does likewise for the B ports. The address lines (1A0 –1A3 or 2A0 –2A3) are decoded by an internal 1-of-16 decoder to select which register word is to be accessed. All outputs are 3-state buffer-type outputs designed specifically to drive bus lines directly. The SN74ALS870 is characterized for operation from 0 °C to 70°C. FUNCTION TABLE FILE SELECT INPUT/OUTPUT S0 S1 FILE SEL S2 S3 I/O SEL L L 1R to A, 1R to B H L 2R to A, 1R to B L L A out B out L H 1R to A, 2R to B L L A out, B out H H 2R to A, 2R to B L L A to 1R, 1R to B H L A to 2R, 1R to B H L A in B out L H A to 1R, 2R to B H L A in, B out H H A to 2R, 2R to B L L 1R to A, B to 1R H L 2R to A, B to 1R L H A out B in L H 1R to A, B to 2R L H A out, B in H H 2R to A, B to 2R L L B to 1R H L A to 2R, B to 1R H H Ain B in L H A to 1R, B to 2R H H A in, B in H H B to 2R 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. |
Numéro de pièce similaire - SN74ALS870NT |
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Description similaire - SN74ALS870NT |
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