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SN74AHC123ADR 数据表(PDF) 10 Page - Texas Instruments |
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SN74AHC123ADR 数据表(HTML) 10 Page - Texas Instruments |
10 / 28 page SN54AHC123A, SN74AHC123A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS SCLS352H − JULY 1997 − REVISED OCTOBER 2005 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION retriggering data The minimum input retriggering time (tMIR) is the minimum time required after the initial signal before retriggering the input. After tMIR, the device retriggers the output. Experimentally, it also can be shown that to retrigger the output pulse, the two adjacent input signals should be tMIR apart, where tMIR = 0.30 × tw. The retrigger pulse duration is calculated as shown in Figure 3. tMIR tRT tPLH tw Input Output tRT = tw + tPLH = (K × RT × CT) + tPLH Where: tMIR = Minimum Input Retriggering Time tPLH = Propagation Delay tRT = Retrigger Time tw = Output Pulse Duration Before Retriggering Figure 3. Retrigger Pulse Duration The minimum value from the end of the input pulse to the beginning of the retriggered output should be approximately 15 ns to ensure a retriggered output (see Figure 4). Input Output tMRT = Minimum Time Between the End of the Second Input Pulse and the Beginning of the Retriggered Output tMRT = 15 ns tMRT Figure 4. Input/Output Requirements |
类似零件编号 - SN74AHC123ADR |
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类似说明 - SN74AHC123ADR |
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