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SN74AS181A Folha de dados(PDF) 2 Page - Texas Instruments |
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SN74AS181A Folha de dados(HTML) 2 Page - Texas Instruments |
2 / 13 page SN54AS181B, SN74AS181A ARITHMETIC LOGIC UNITS/FUNCTION GENERATORS SDAS209B – DECEMBER 1982 – REVISED DECEMBER 1994 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description (continued) The SN54AS181B and SN74AS181A also can be used as comparators. The A = B output is internally decoded from the function (F0, F1, F2, F3) outputs so that when two words of equal magnitude are applied at the A and B inputs, the output assumes a high level to indicate equality (A = B). The ALU must be in the subtract mode with Cn = H when performing this comparison. The A = B output is open collector so that it can be wire-AND connected to give a comparison for more than four bits. Cn + 4 also can be used to supply relative magnitude information. The ALU must be placed in the subtract mode by placing the function-select inputs S3, S2, S1, and S0 at L, H, H, and L, respectively. INPUT Cn OUTPUT Cn + 4 ACTIVE-LOW DATA (Figure 1) ACTIVE-HIGH DATA (Figure 2) H H A ≥ B A ≤ B H L A < B A > B L H A > B A < B L L A ≤ B A ≥ B These circuits not only incorporate all of the designer’s requirements for arithmetic operations, but also provide 16 possible functions of two Boolean variables without using external circuitry. These logic functions are selected by the four function-select inputs with M at a high level to disable the internal carry. The 16 logic functions are detailed in Tables 1 and 2 and include exclusive-OR, NAND, AND, NOR, and OR functions. TYPICAL ADDITION TIME (CL = 15 pF, RL = 280 Ω, TA = 25°C) ADDITION PACKAGE COUNT NUMBER OF BITS TIME USING ′S181 AND ′S182 ALUs LOOK-AHEAD CARRY GENERATORS CARRY METHOD BETWEEN ALUs 1 to 4 11 ns 1 None 5 to 8 18 ns 2 Ripple 9 to 16 19 ns 3 or 4 1 Full look ahead 17 to 64 28 ns 5 to 16 2 to 5 Full look ahead The SN54AS181B is characterized for operation over the full military temperature range of – 55 °C to 125°C. The SN74AS181A is characterized for operation from 0 °C to 70°C. application note An application-specific problem has been identified in the SN54AS181B device. The F0 – F4 outputs exhibit voltage transients when one or more B-data inputs transition from a high to a low state. The resultant voltage transients can have an amplitude of 2 V relative to VOL with a width of 5 ns at an input threshold of 1.5 V. The transient pulse occurs coincidentally with the high-to-low transition of the B-data input(s) and appears to be caused by internal coupling. In system operations in which this device is used, it is likely that transmission-line effects minimize this anomaly. Narrow width of the voltage transient makes the pulse transparent to most circuitry; however, in certain applications, the transients can cause system errors. |
Nº de peça semelhante - SN74AS181A |
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Descrição semelhante - SN74AS181A |
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