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SNJ54HC191W Datasheet(PDF) 7 Page - Texas Instruments |
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SNJ54HC191W Datasheet(HTML) 7 Page - Texas Instruments |
7 / 21 page SN54HC191, SN74HC191 4BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS SCLS121D − DECEMBER 1982 − REVISED OCTOBER 2003 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 timing requirements over recommended operating free-air temperature range (unless otherwise noted) VCC TA = 25°C SN54HC191 SN74HC191 UNIT VCC MIN MAX MIN MAX MIN MAX UNIT 2 V 4.2 2.8 3.3 fclock Clock frequency 4.5 V 21 14 17 MHz fclock Clock frequency 6 V 24 16 19 MHz 2 V 120 180 150 LOAD low 4.5 V 24 36 30 tw Pulse duration LOAD low 6 V 21 31 26 ns tw Pulse duration 2 V 120 180 150 ns CLK high or low 4.5 V 24 36 30 CLK high or low 6 V 21 31 26 2 V 150 230 188 Data before LOAD ↑ 4.5 V 30 46 38 Data before LOAD ↑ 6 V 25 38 32 2 V 205 306 255 CTEN before CLK ↑ 4.5 V 41 61 51 tsu Setup time CTEN before CLK ↑ 6 V 35 53 44 ns tsu Setup time 2 V 205 306 255 ns D/U before CLK ↑ 4.5 V 41 61 51 D/U before CLK ↑ 6 V 35 53 44 2 V 150 225 190 LOAD inactive before CLK ↑ 4.5 V 30 45 38 LOAD inactive before CLK ↑ 6 V 25 38 32 2 V 5 5 5 Data after LOAD ↑ 4.5 V 5 5 5 Data after LOAD ↑ 6 V 5 5 5 2 V 5 5 5 th Hold time CTEN after CLK ↑ 4.5 V 5 5 5 ns th Hold time CTEN after CLK ↑ 6 V 5 5 5 ns 2 V 5 5 5 D/U after CLK ↑ 4.5 V 5 5 5 D/U after CLK 6 V 5 5 5 |
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