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SN74HC161NSR 데이터시트(PDF) 10 Page - Texas Instruments |
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SN74HC161NSR 데이터시트(HTML) 10 Page - Texas Instruments |
10 / 24 page SN54HC161, SN74HC161 4BIT SYNCHRONOUS BINARY COUNTERS SCLS297D − JANUARY 1996 − REVISED SEPTEMBER 2003 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION n-bit synchronous counters This application demonstrates how the look-ahead carry circuit can be used to implement a high-speed n-bit counter. The ’HC161 devices count in binary. Virtually any count mode (modulo-N, N1-to-N2, N1-to-maximum) can be used with this fast look-ahead circuit. The application circuit shown in Figure 2 is not valid for clock frequencies above 18 MHz (at 25 °C and 4.5-V VCC). The reason for this is that there is a glitch that is produced on the second stage’s RCO and every succeeding stage’s RCO. This glitch is common to all HC vendors that Texas Instruments has evaluated, in addition to the bipolar equivalents (LS, ALS, AS). |
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