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74HCT4520 Datasheet(PDF) 6 Page - Texas Instruments |
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74HCT4520 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 8 page 6 HCT TYPES Propagation Delay CP to Qn tPLH, tPHL CL = 50pF 4.5 - - 53 - 66 - 80 ns CL = 15pF 5 - 22 - - - - - ns Enable to Qn tPLH, tPHL CL = 50pF 4.5 - - 55 - 69 - 83 ns CL = 15pF 5 - 23 - - - - - ns MR to Qn tPLH, tPHL CL = 50pF 4.5 - - 35 - 44 - 53 ns CL = 15pF 5 - 14 - - - - - ns Output Transition Time tTHL,tTLH CL = 50pF 4.5 - - 15 - 19 - 22 ns Input Capacitance CIN CL = 50pF - - - 10 - 10 - 10 pF Maximum Clock Frequency fMAX CL = 15pF 5 - 50 - - - - - MHz Power Dissipation Capacitance (Note 4,5) CPD -5 - 33 - - - - - pF NOTES: 4. CPD is used to determine the dynamic power consumption, per counter. 5. 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 Timing Diagram FIGURE 6. CLOCK ENABLE MASTER RESET HC4518 HC/HCT4520 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 123456789 0 1 23456789 0 123456789 10 11 12 13 14 15 0123 4 CD74HC4518, CD74HC4520, CD74HCT4520 |
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