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SN74ALS191A 데이터시트(PDF) 2 Page - Texas Instruments |
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SN74ALS191A 데이터시트(HTML) 2 Page - Texas Instruments |
2 / 8 page SN54ALS191A, SN74ALS191A SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS SDAS210C – DECEMBER 1982 – REVISED JULY 1996 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description (continued) Two outputs are available to perform the cascading function: ripple clock and maximum/minimum count. The latter output produces a high-level output pulse with a duration approximately equal to one complete cycle of the clock while the count is minimum (0) counting down or maximum (15) counting up. The ripple-clock output (RCO) produces a low-level output pulse under those same conditions, but only while the clock input is low. The counter easily can be cascaded by feeding the ripple-clock output to the enable input of the succeeding counter if parallel clocking is used, or to the clock input if parallel enabling is used. The maximum/minimum count (MAX/MIN) output can be used to accomplish look ahead for high-speed operation. The SN54ALS191A is characterized for operation over the full military temperature range of – 55 °C to 125°C. The SN74ALS191A is characterized for operation from 0 °C to 70°C. logic symbol† 1,2– / 1,3+ CTRDIV16 M2 [DOWN] 5 M3 [UP] 14 CLK G4 C5 11 MAX/MIN 12 2(CT=0)Z6 3(CT=15)Z6 13 6,1,4 3 2 6 7 5D 15 A 1 B 10 C 9 D G1 4 [1] [2] [4] [8] CTEN D/U QA QB QC QD LOAD RCO † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Pin numbers shown are for the D, J, and N packages. |
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