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M74HCT643B1R Datasheet(PDF) 5 Page - STMicroelectronics |
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M74HCT643B1R Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 11 page AC ELECTRICAL CHARACTERISTICS (CL =50 pF, Input tr =tf =6 ns) Symbol Parameter Test Conditions Value Unit VCC (V) CL (pF) TA =25 oC 54HC and 74HC -40 to 85 oC 74HC -55 to 125 oC 54HC Min. Typ. Max. Min. Max. Min. Max. tTLH tTHL Output Transition Time 4.5 50 7 12 15 18 ns tPLH tPHL Propagation Delay Time 4.5 50 13 22 28 33 ns 4.5 150 18 30 38 45 ns tPZL tPZH Output Enable Time 4.5 50 RL =1K Ω 19 30 38 45 ns 4.5 150 RL =1K Ω 24 38 48 57 ns tPLZ tPHZ Output Disable Time 4.5 50 RL =1K Ω 17 30 38 45 ns CIN Input Capacitance DIR, G 5 10 10 10 pF CI/OUT Output Capacitance An, Bn 13 pF CPD (*) Power Dissipation Capacitance HCT245 HCT640/643 41 39 pF (*) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test Circuit). Average operting current can be obtained by the following equation. ICC(opr) = CPD •VCC •fIN +ICC/8 (per circuit) SWITCHING CHARACTERISTICS TEST WAVEFORM M54/M74HCT245/640/643 5/11 |
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