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CD74HCT4020MT Datasheet(PDF) 7 Page - Texas Instruments |
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CD74HCT4020MT Datasheet(HTML) 7 Page - Texas Instruments |
7 / 17 page 7 HCT TYPES Propagation Delay Time (Figure 2) tPLH, tPHL CL = 50pF 4.5 - - 40 - 50 - 60 ns CP to Q1’ Output CL =15pF 5 - 17 - - - - - ns Qn to Qn + 1 tPLH, tPHL CL = 50pF 4.5 - - 15 - 19 - 22 ns CL =15pF 5 - 6 - - - - - ns MR to Qn tPLH, tPHL CL = 50pF 4.5 - - 40 - 50 - 60 ns CL =15pF 5 - 17 - - - - - ns Output Transition tTLH,tTHL CL = 50pF 4.5 - - 15 - 19 - 22 ns Input Capacitance CIN CL =15pF - - - 10 - 10 - 10 pF Power Dissipation Capaci- tance (Notes 3, 4) CPD CL =15pF 5 - 30 - - - - - pF NOTES: 3. CPD is used to determine the dynamic power consumption, per package. 4. PD = VCC 2 f i (CPD + CL) where fi = Input Frequency, CL = Output Load Capacitance, VCC = Supply Voltage. Switching Specifications Input tr, tf = 6ns (Continued) PARAMETER SYMBOL TEST CONDITIONS VCC (V) 25oC -40oC TO 85oC -55oC TO 125oC UNITS MIN TYP MAX MIN MAX MIN MAX Test Circuits and Waveforms NOTE: Outputs should be switching from 10% VCC to 90% VCC in accordance with device truth table. For fMAX, input duty cycle = 50%. FIGURE 1. HC CLOCK PULSE RISE AND FALL TIMES AND PULSE WIDTH NOTE: Outputs should be switching from 10% VCC to 90% VCC in accordance with device truth table. For fMAX, input duty cycle = 50%. FIGURE 2. HCT CLOCK PULSE RISE AND FALL TIMES AND PULSE WIDTH CLOCK 90% 50% 10% GND VCC trCL tfCL 50% 50% tWL tWH 10% tWL + tWH = fCL I CLOCK 2.7V 1.3V 0.3V GND 3V trCL = 6ns tfCL = 6ns 1.3V 1.3V tWL tWH 0.3V tWL + tWH = fCL I CD54HC4020, CD74HC4020, CD54HCT4020, CD74HCT4020 |
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