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54HC244 датащи(PDF) 6 Page - STMicroelectronics |
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54HC244 датащи(HTML) 6 Page - STMicroelectronics |
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6 / 12 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 2.0 50 25 60 75 90 ns 4.5 7 121918 6.0 6 101315 tPLH tPHL Propagation Delay Time 2.0 50 36 90 115 135 ns 4.5 12 18 23 27 6.0 10 15 20 23 2.0 150 51 130 165 195 ns 4.5 17 26 33 39 6.0 14 22 28 33 tPZL tPZH Output Enable Time 2.0 50 RL =1K Ω 48 125 155 190 ns 4.5 16 25 31 38 6.0 14 21 26 32 2.0 150 RL =1K Ω 63 165 205 250 ns 4.5 21 33 41 50 6.0 18 28 35 43 tPLZ tPHZ Output Disable Time 2.0 50 RL =1K Ω 32 125 155 190 ns 4.5 15 25 31 38 6.0 14 21 26 32 CIN Input Capacitance 5 10 10 10 pF COUT Output Capacitance 10 pF CPD (*) Power Dissipation Capacitance HC240 HC241/244 31 33 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) TEST CIRCUIT ICC (Opr.) HC240 M54/M74HC240/241/244 6/12 |
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